Merge branch 'dev-0.12' of https://github.com/s-allius/tsun-gen3-proxy into titan-scan

S allius/issue205 (#207 )
* Add SolarmanEmu class * Forward a device ind to establish the EMU connection * Move SolarmanEmu class into a dedicated file * Add cloud connection counter * Send inverter data in emulator mode * Improve emulator mode - parse more values from MQTT register - differ between inverter and logger serial no * Add some unit tests for SolarmanEmu class * Send seconds since last sync in data packets * Increase test coverage
2024-11-14 19:38:18 +01:00 · 2024-11-13 22:03:28 +01:00 · 2024-11-02 15:40:32 +01:00 · 2024-11-02 15:09:10 +01:00 · 2024-10-26 17:30:00 +02:00 · 2024-10-25 23:49:35 +02:00
52 changed files with 5790 additions and 2063 deletions
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -24,27 +24,15 @@ permissions:
  contents: read
  pull-requests: read # allows SonarCloud to decorate PRs with analysis results

+env:
+  TZ: "Europe/Berlin"
+
 jobs:
  build:

    runs-on: ubuntu-latest

    steps:
-    - name: Set timezone
-      uses: szenius/set-timezone@v2.0
-      with:
-        timezoneLinux: "Europe/Berlin"
-        timezoneMacos: "Europe/Berlin"
-        timezoneWindows: "Europe/Berlin"
-    # - name: Start Mosquitto
-    #  uses: namoshek/mosquitto-github-action@v1
-    #  with:
-    #    version: '1.6'
-    #    ports: '1883:1883 8883:8883'
-        # certificates: ${{ github.workspace }}/.ci/tls-certificates
-        # config: ${{ github.workspace }}/.ci/mosquitto.conf
-        # password-file: ${{ github.workspace}}/.ci/mosquitto.passwd
-    #    container-name: 'mqtt'
    - uses: actions/checkout@v4
      with:
        fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
@@ -68,7 +56,7 @@ jobs:
        python -m pytest app --cov=app/src --cov-report=xml
        coverage report
    - name: Analyze with SonarCloud
-      uses: SonarSource/sonarcloud-github-action@v2.2.0
+      uses: SonarSource/sonarcloud-github-action@v3.1.0
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

 ## [unreleased]

- GEN3: add support for new messages of version 3 firmwares
+- add SolarmanV5 messages builder
+- report inverter alarms and faults per MQTT [#7](https://github.com/s-allius/tsun-gen3-proxy/issues/7)
+
+## [0.11.0] - 2024-10-13
+
+- fix healthcheck on infrastructure with IPv6 support [#196](https://github.com/s-allius/tsun-gen3-proxy/issues/196)
+- refactoring: cleaner architecture, increase test coverage
+- Parse more values in Server Mode [#186](https://github.com/s-allius/tsun-gen3-proxy/issues/186)
+- GEN3: add support for new messages of version 3 firmwares [#182](https://github.com/s-allius/tsun-gen3-proxy/issues/182)
 - add support for controller MAC and serial number
 - GEN3: don't crash on overwritten msg in the receive buffer
 - Reading the version string from the image updates it even if the image is re-pulled without re-deployment
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 <p align="center">
    <a href="https://opensource.org/licenses/BSD-3-Clause"><img alt="License: BSD-3-Clause" src="https://img.shields.io/badge/License-BSD_3--Clause-green.svg"></a>
    <a href="https://www.python.org/downloads/release/python-3120/"><img alt="Supported Python versions" src="https://img.shields.io/badge/python-3.12-blue.svg"></a>
-    <a href="https://sbtinstruments.github.io/aiomqtt/introduction.html"><img alt="Supported aiomqtt versions" src="https://img.shields.io/badge/aiomqtt-2.2.0-lightblue.svg"></a>
+    <a href="https://sbtinstruments.github.io/aiomqtt/introduction.html"><img alt="Supported aiomqtt versions" src="https://img.shields.io/badge/aiomqtt-2.3.0-lightblue.svg"></a>
    <a href="https://libraries.io/pypi/aiocron"><img alt="Supported aiocron versions" src="https://img.shields.io/badge/aiocron-1.8-lightblue.svg"></a>
    <a href="https://toml.io/en/v1.0.0"><img alt="Supported toml versions" src="https://img.shields.io/badge/toml-1.0.0-lightblue.svg"></a>   
    <br>
@@ -121,26 +121,63 @@ The proxy can be configured via the file 'config.toml'. When the proxy is starte
 The configration uses the TOML format, which aims to be easy to read due to obvious semantics.
 You find more details here: <https://toml.io/en/v1.0.0>

+<details>
+<summary>Here is an example of a <b>config.toml</b> file</summary>
+
 ```toml
-# configuration for tsun cloud for 'GEN3' inverters
-tsun.enabled = true   # false: disables connecting to the tsun cloud, and avoids updates
-tsun.host    = 'logger.talent-monitoring.com'
-tsun.port    = 5005
-
-# configuration for solarman cloud  for 'GEN3 PLUS' inverters
-solarman.enabled = true   # false: disables connecting to the tsun cloud, and avoids updates
-solarman.host    = 'iot.talent-monitoring.com'
-solarman.port    = 10000
+##########################################################################################
+###
+###          T S U N  -  G E N 3  -   P R O X Y
+### 
+###                from   Stefan Allius
+###
+##########################################################################################
+###
+###   The readme will give you an overview of the project:
+###   https://s-allius.github.io/tsun-gen3-proxy/
+###
+###   The proxy supports different operation modes. Select the proper mode 
+###   which depends on your inverter type and you inverter firmware. 
+###   Please read: 
+###   https://github.com/s-allius/tsun-gen3-proxy/wiki/Operation-Modes-Overview
+###
+###   Here you will find a description of all configuration options:
+###   https://github.com/s-allius/tsun-gen3-proxy/wiki/Configuration-details
+###
+###   The configration uses the TOML format, which aims to be easy to read due to 
+###   obvious semantics. You find more details here: https://toml.io/en/v1.0.0
+###
+##########################################################################################


-# mqtt broker configuration
+##########################################################################################
+##
+## MQTT broker configuration
+##
+## In this block, you must configure the connection to your MQTT broker and specify the
+## required credentials. As the proxy does not currently support an encrypted connection
+## to the MQTT broker, it is strongly recommended that you do not use a public broker.
+##
+## https://github.com/s-allius/tsun-gen3-proxy/wiki/Configuration-details#mqtt-broker-account
+##
+
 mqtt.host    = 'mqtt'   # URL or IP address of the mqtt broker
 mqtt.port    = 1883
 mqtt.user    = ''
 mqtt.passwd  = ''


-# home-assistant
+##########################################################################################
+##
+## HOME ASSISTANT
+##
+## The proxy supports the MQTT autoconfiguration of Home Assistant (HA). The default 
+## values match the HA default configuration. If you need to change these or want to use
+## a different MQTT client, you can adjust the prefixes of the MQTT topics below.
+##
+## https://github.com/s-allius/tsun-gen3-proxy/wiki/Configuration-details#home-assistant
+##
+
 ha.auto_conf_prefix = 'homeassistant'       # MQTT prefix for subscribing for homeassistant status updates
 ha.discovery_prefix = 'homeassistant'       # MQTT prefix for discovery topic 
 ha.entity_prefix    = 'tsun'                # MQTT topic prefix for publishing inverter values
@@ -148,40 +185,115 @@ ha.proxy_node_id    = 'proxy'               # MQTT node id, for the proxy_node_i
 ha.proxy_unique_id  = 'P170000000000001'    # MQTT unique id, to identify a proxy instance


-# microinverters
-inverters.allow_all = false   # True: allow inverters, even if we have no inverter mapping
+##########################################################################################
+##
+## GEN3 Proxy Mode Configuration
+##
+## In this block, you can configure an optional connection to the TSUN cloud for GEN3
+## inverters. This connection is only required if you want send data to the TSUN cloud
+## to use the TSUN APPs or receive firmware updates.  
+##
+## https://github.com/s-allius/tsun-gen3-proxy/wiki/Configuration-details#tsun-cloud-for-gen3-inverter-only
+##

-# inverter mapping, maps a `serial_no* to a `node_id` and defines an optional `suggested_area` for `home-assistant`
-#
-# for each inverter add a block starting with [inverters."<16-digit serial numbeer>"]
+tsun.enabled = true   # false: disables connecting to the tsun cloud, and avoids updates
+tsun.host    = 'logger.talent-monitoring.com'
+tsun.port    = 5005
+
+
+##########################################################################################
+##
+## GEN3PLUS Proxy Mode Configuration
+##
+## In this block, you can configure an optional connection to the TSUN cloud for GEN3PLUS
+## inverters. This connection is only required if you want send data to the TSUN cloud
+## to use the TSUN APPs or receive firmware updates.  
+##
+## https://github.com/s-allius/tsun-gen3-proxy/wiki/Configuration-details#solarman-cloud-for-gen3plus-inverter-only
+##
+solarman.enabled = true   # false: disables connecting to the tsun cloud, and avoids updates
+solarman.host    = 'iot.talent-monitoring.com'
+solarman.port    = 10000
+
+
+##########################################################################################
+###
+### Inverter Definitions
+###
+### The proxy supports the simultaneous operation of several inverters, even of different
+### types. A configuration block must be defined for each inverter, in which all necessary
+### parameters must be specified. These depend on the operation mode used and also differ
+### slightly depending on the inverter type.
+###
+### In addition, the PV modules can be defined at the individual inputs for documentation
+### purposes, whereby these are displayed in Home Assistant.
+###
+### The proxy only accepts connections from known inverters. This can be switched off for
+### test purposes and unknown serial numbers are also accepted. 
+###
+
+inverters.allow_all = false   # only allow known inverters
+
+
+##########################################################################################
+##
+## For each GEN3 inverter, the serial number of the inverter must be mapped to an MQTT
+## definition. To do this, the corresponding configuration block is started with
+## `[Inverter.“<16-digit serial number>”]` so that all subsequent parameters are assigned
+## to this inverter. Further inverter-specific parameters (e.g. polling mode) can be set
+## in the configuration block
+##
+## The serial numbers of all GEN3 inverters start with `R17`!
+##

 [inverters."R17xxxxxxxxxxxx1"]
-node_id = 'inv1'              # Optional, MQTT replacement for inverters serial number  
-suggested_area = 'roof'       # Optional, suggested installation area for home-assistant
-modbus_polling = false        # Disable optional MODBUS polling for GEN3 inverter
+node_id = 'inv_1'            # MQTT replacement for inverters serial number  
+suggested_area = 'roof'      # suggested installation place for home-assistant
+modbus_polling = false       # Disable optional MODBUS polling for GEN3 inverter
 pv1 = {type = 'RSM40-8-395M', manufacturer = 'Risen'}   # Optional, PV module descr
 pv2 = {type = 'RSM40-8-395M', manufacturer = 'Risen'}   # Optional, PV module descr

-[inverters."R17xxxxxxxxxxxx2"]
-node_id = 'inv2'              # Optional, MQTT replacement for inverters serial number  
-suggested_area = 'balcony'    # Optional, suggested installation area for home-assistant
-modbus_polling = false        # Disable optional MODBUS polling for GEN3 inverter
-pv1 = {type = 'RSM40-8-405M', manufacturer = 'Risen'}   # Optional, PV module descr
-pv2 = {type = 'RSM40-8-405M', manufacturer = 'Risen'}   # Optional, PV module descr
+
+##########################################################################################
+##
+## For each GEN3PLUS inverter, the serial number of the inverter must be mapped to an MQTT
+## definition. To do this, the corresponding configuration block is started with
+## `[Inverter.“<16-digit serial number>”]` so that all subsequent parameters are assigned
+## to this inverter. Further inverter-specific parameters (e.g. polling mode, client mode)
+## can be set in the configuration block
+## 
+## The serial numbers of all GEN3PLUS inverters start with `Y17` or Y47! Each GEN3PLUS
+## inverter is supplied with a “Monitoring SN:”. This can be found on a sticker enclosed
+## with the inverter.
+##

 [inverters."Y17xxxxxxxxxxxx1"]  # This block is also for inverters with a Y47 serial no
-monitor_sn = 2000000000       # The "Monitoring SN:" can be found on a sticker enclosed with the inverter
-node_id = 'inv_3'             # MQTT replacement for inverters serial number  
-suggested_area = 'garage'     # suggested installation place for home-assistant
-modbus_polling = false        # Enable optional MODBUS polling for GEN3PLUS inverter
+monitor_sn = 2000000000      # The GEN3PLUS "Monitoring SN:"
+node_id = 'inv_2'            # MQTT replacement for inverters serial number  
+suggested_area = 'garage'    # suggested installation place for home-assistant
+modbus_polling = true        # Enable optional MODBUS polling
+
 # if your inverter supports SSL connections you must use the client_mode. Pls, uncomment
 # the next line and configure the fixed IP of your inverter
 #client_mode = {host = '192.168.0.1', port = 8899}       
+
 pv1 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr
 pv2 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr
 pv3 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr
 pv4 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr

+
+##########################################################################################
+###
+### If the proxy mode is configured, commands from TSUN can be sent to the inverter via
+### this connection or parameters (e.g. network credentials) can be queried. Filters can
+### then be configured for the AT+ commands from the TSUN Cloud so that only certain
+### accesses are permitted.
+###
+### An overview of all known AT+ commands can be found here:
+### https://github.com/s-allius/tsun-gen3-proxy/wiki/AT--commands
+###
+
 [gen3plus.at_acl]
 tsun.allow = ['AT+Z', 'AT+UPURL', 'AT+SUPDATE']   # allow this for TSUN access
 tsun.block = []                                   
@@ -190,6 +302,8 @@ mqtt.block = []

 ```

+</details>
+
 ## Inverter Configuration

 GEN3PLUS inverters offer a web interface that can be used to configure the inverter. This is very practical for sending the data directly to the proxy. On the one hand, the inverter broadcasts its own SSID on 2.4GHz. This can be recognized because it is broadcast with `AP_<Montoring SN>`. You will find the `Monitor SN` and the password for the WLAN connection on a small sticker enclosed with the inverter.
--- a/app/config/default_config.toml
+++ b/app/config/default_config.toml
@@ -1,64 +1,177 @@
-# configuration to reach tsun cloud
-tsun.enabled = true   # false: disables connecting to the tsun cloud, and avoids updates
-tsun.host    = 'logger.talent-monitoring.com'
-tsun.port    = 5005
+##########################################################################################
+###
+###          T S U N  -  G E N 3  -   P R O X Y
+### 
+###                from   Stefan Allius
+###
+##########################################################################################
+###
+###   The readme will give you an overview of the project:
+###   https://s-allius.github.io/tsun-gen3-proxy/
+###
+###   The proxy supports different operation modes. Select the proper mode 
+###   which depends on your inverter type and you inverter firmware. 
+###   Please read: 
+###   https://github.com/s-allius/tsun-gen3-proxy/wiki/Operation-Modes-Overview
+###
+###   Here you will find a description of all configuration options:
+###   https://github.com/s-allius/tsun-gen3-proxy/wiki/Configuration-details
+###
+###   The configration uses the TOML format, which aims to be easy to read due to 
+###   obvious semantics. You find more details here: https://toml.io/en/v1.0.0
+###
+##########################################################################################

-# configuration to reach the new tsun cloud for G3 Plus inverters
-solarman.enabled = true   # false: disables connecting to the tsun cloud, and avoids updates
-solarman.host    = 'iot.talent-monitoring.com'
-solarman.port    = 10000

-# mqtt broker configuration
+##########################################################################################
+##
+## MQTT broker configuration
+##
+## In this block, you must configure the connection to your MQTT broker and specify the
+## required credentials. As the proxy does not currently support an encrypted connection
+## to the MQTT broker, it is strongly recommended that you do not use a public broker.
+##
+## https://github.com/s-allius/tsun-gen3-proxy/wiki/Configuration-details#mqtt-broker-account
+##
+
 mqtt.host    = 'mqtt'   # URL or IP address of the mqtt broker
 mqtt.port    = 1883
 mqtt.user    = ''
 mqtt.passwd  = ''


-# home-assistant
+##########################################################################################
+##
+## HOME ASSISTANT
+##
+## The proxy supports the MQTT autoconfiguration of Home Assistant (HA). The default 
+## values match the HA default configuration. If you need to change these or want to use
+## a different MQTT client, you can adjust the prefixes of the MQTT topics below.
+##
+## https://github.com/s-allius/tsun-gen3-proxy/wiki/Configuration-details#home-assistant
+##
+
 ha.auto_conf_prefix = 'homeassistant'       # MQTT prefix for subscribing for homeassistant status updates
 ha.discovery_prefix = 'homeassistant'       # MQTT prefix for discovery topic 
 ha.entity_prefix    = 'tsun'                # MQTT topic prefix for publishing inverter values
 ha.proxy_node_id    = 'proxy'               # MQTT node id, for the proxy_node_id
 ha.proxy_unique_id  = 'P170000000000001'    # MQTT unique id, to identify a proxy instance

-# microinverters
-inverters.allow_all = true   # allow inverters, even if we have no inverter mapping

-# inverter mapping, maps a `serial_no* to a `mqtt_id` and defines an optional `suggested_place` for `home-assistant`
-#
-# for each inverter add a block starting with [inverters."<16-digit serial numbeer>"]
+##########################################################################################
+##
+## GEN3 Proxy Mode Configuration
+##
+## In this block, you can configure an optional connection to the TSUN cloud for GEN3
+## inverters. This connection is only required if you want send data to the TSUN cloud
+## to use the TSUN APPs or receive firmware updates.  
+##
+## https://github.com/s-allius/tsun-gen3-proxy/wiki/Configuration-details#tsun-cloud-for-gen3-inverter-only
+##
+
+tsun.enabled = true   # false: disables connecting to the tsun cloud, and avoids updates
+tsun.host    = 'logger.talent-monitoring.com'
+tsun.port    = 5005
+
+
+##########################################################################################
+##
+## GEN3PLUS Proxy Mode Configuration
+##
+## In this block, you can configure an optional connection to the TSUN cloud for GEN3PLUS
+## inverters. This connection is only required if you want send data to the TSUN cloud
+## to use the TSUN APPs or receive firmware updates.  
+##
+## https://github.com/s-allius/tsun-gen3-proxy/wiki/Configuration-details#solarman-cloud-for-gen3plus-inverter-only
+##
+
+solarman.enabled = true   # false: disables connecting to the tsun cloud, and avoids updates
+solarman.host    = 'iot.talent-monitoring.com'
+solarman.port    = 10000
+
+
+##########################################################################################
+###
+### Inverter Definitions
+###
+### The proxy supports the simultaneous operation of several inverters, even of different
+### types. A configuration block must be defined for each inverter, in which all necessary
+### parameters must be specified. These depend on the operation mode used and also differ
+### slightly depending on the inverter type.
+###
+### In addition, the PV modules can be defined at the individual inputs for documentation
+### purposes, whereby these are displayed in Home Assistant.
+###
+### The proxy only accepts connections from known inverters. This can be switched off for
+### test purposes and unknown serial numbers are also accepted. 
+###
+
+inverters.allow_all = false   # only allow known inverters
+
+
+##########################################################################################
+##
+## For each GEN3 inverter, the serial number of the inverter must be mapped to an MQTT
+## definition. To do this, the corresponding configuration block is started with
+## `[Inverter.“<16-digit serial number>”]` so that all subsequent parameters are assigned
+## to this inverter. Further inverter-specific parameters (e.g. polling mode) can be set
+## in the configuration block
+##
+## The serial numbers of all GEN3 inverters start with `R17`!
+##
+
 [inverters."R170000000000001"]
-#node_id = ''                 # Optional, MQTT replacement for inverters serial number  
-#suggested_area = ''          # Optional, suggested installation area for home-assistant
-modbus_polling = false        # Disable optional MODBUS polling
-#pv1 = {type = 'RSM40-8-395M', manufacturer = 'Risen'}   # Optional, PV module descr
-#pv2 = {type = 'RSM40-8-395M', manufacturer = 'Risen'}   # Optional, PV module descr
+node_id = ''                 # MQTT replacement for inverters serial number  
+suggested_area = ''          # suggested installation area for home-assistant
+modbus_polling = false       # Disable optional MODBUS polling
+pv1 = {type = 'RSM40-8-395M', manufacturer = 'Risen'}   # Optional, PV module descr
+pv2 = {type = 'RSM40-8-395M', manufacturer = 'Risen'}   # Optional, PV module descr

-#[inverters."R17xxxxxxxxxxxx2"]
-#node_id = ''                 # Optional, MQTT replacement for inverters serial number  
-#suggested_area = ''          # Optional, suggested installation area for home-assistant
-#modbus_polling = false        # Disable optional MODBUS polling
-#pv1 = {type = 'RSM40-8-405M', manufacturer = 'Risen'}   # Optional, PV module descr
-#pv2 = {type = 'RSM40-8-405M', manufacturer = 'Risen'}   # Optional, PV module descr
+
+##########################################################################################
+##
+## For each GEN3PLUS inverter, the serial number of the inverter must be mapped to an MQTT
+## definition. To do this, the corresponding configuration block is started with
+## `[Inverter.“<16-digit serial number>”]` so that all subsequent parameters are assigned
+## to this inverter. Further inverter-specific parameters (e.g. polling mode, client mode)
+## can be set in the configuration block
+## 
+## The serial numbers of all GEN3PLUS inverters start with `Y17` or Y47! Each GEN3PLUS
+## inverter is supplied with a “Monitoring SN:”. This can be found on a sticker enclosed
+## with the inverter.
+##

 [inverters."Y170000000000001"]
-monitor_sn = 2000000000       # The "Monitoring SN:" can be found on a sticker enclosed with the inverter
-#node_id = ''                 # Optional, MQTT replacement for inverters serial number  
-#suggested_area = ''          # Optional, suggested installation place for home-assistant
-modbus_polling = true         # Enable optional MODBUS polling
+monitor_sn = 2000000000      # The GEN3PLUS "Monitoring SN:"
+node_id = ''                 # MQTT replacement for inverters serial number  
+suggested_area = ''          # suggested installation place for home-assistant
+modbus_polling = true        # Enable optional MODBUS polling

 # if your inverter supports SSL connections you must use the client_mode. Pls, uncomment
 # the next line and configure the fixed IP of your inverter
 #client_mode = {host = '192.168.0.1', port = 8899}  

-#pv1 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr
-#pv2 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr
-#pv3 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr
-#pv4 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr
+pv1 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr
+pv2 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr
+pv3 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr
+pv4 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr
+
+
+##########################################################################################
+###
+### If the proxy mode is configured, commands from TSUN can be sent to the inverter via
+### this connection or parameters (e.g. network credentials) can be queried. Filters can
+### then be configured for the AT+ commands from the TSUN Cloud so that only certain
+### accesses are permitted.
+###
+### An overview of all known AT+ commands can be found here:
+### https://github.com/s-allius/tsun-gen3-proxy/wiki/AT--commands
+###

 [gen3plus.at_acl]
+# filter for received commands from the internet
 tsun.allow = ['AT+Z', 'AT+UPURL', 'AT+SUPDATE']
 tsun.block = []
+# filter for received commands from the MQTT broker
 mqtt.allow = ['AT+']
 mqtt.block = []
--- a/app/proxy.svg
+++ b/app/proxy.svg
@@ -4,408 +4,257 @@
 <!-- Generated by graphviz version 2.40.1 (20161225.0304)
 -->
 <!-- Title: G Pages: 1 -->
-<svg width="720pt" height="1360pt"
- viewBox="0.00 0.00 719.50 1360.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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 <title>A5&#45;&gt;A6</title>
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-<polygon fill="none" stroke="#000000" points="400.8317,-775.2382 400.269,-785.8181 407.3066,-777.8983 400.8317,-775.2382"/>
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+<text text-anchor="middle" x="300.5" y="-217" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">InverterG3</text>
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 <title>A9</title>
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+<title>A5&#45;&gt;A9</title>
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+<title>A11</title>
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+<!-- A6&#45;&gt;A11 -->
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+<title>A6&#45;&gt;A11</title>
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--- a/app/proxy.yuml
+++ b/app/proxy.yuml
@@ -3,28 +3,34 @@
 // {generate:true}

 [note: You can stick notes on diagrams too!{bg:cornsilk}]
-[Singleton]^[Mqtt|<static>ha_restarts;<static>__client;<static>__cb_MqttIsUp|<async>publish();<async>close()]
-[Modbus|que;;snd_handler;rsp_handler;timeout;max_retires;last_xxx;err;retry_cnt;req_pend;tim|build_msg();recv_req();recv_resp();close()]
-[IterRegistry||__iter__]^[Message|server_side:bool;header_valid:bool;header_len:unsigned;data_len:unsigned;unique_id;node_id;sug_area;_recv_buffer:bytearray;_send_buffer:bytearray;_forward_buffer:bytearray;db:Infos;new_data:list;state|_read():void<abstract>;close():void;inc_counter():void;dec_counter():void]
-[Message]^[Talent|await_conn_resp_cnt;id_str;contact_name;contact_mail;db:InfosG3;mb:Modbus;switch|msg_contact_info();msg_ota_update();msg_get_time();msg_collector_data();msg_inverter_data();msg_unknown();;close()]
-[Message]^[SolarmanV5|control;serial;snr;db:InfosG3P;mb:Modbus;switch|msg_unknown();;close()]
-[Talent]^[ConnectionG3|remote_stream:ConnectionG3|healthy();close()]
-[Talent]has-1>[Modbus]
-[SolarmanV5]^[ConnectionG3P|remote_stream:ConnectionG3P|healthy();close()]
-[SolarmanV5]has-1>[Modbus]
-[AsyncStream|reader;writer;addr;r_addr;l_addr|<async>server_loop();<async>client_loop();<async>loop;disc();close();;__async_read();async_write();__async_forward()]^[ConnectionG3]
-[AsyncStream]^[ConnectionG3P]
-[Inverter|cls.db_stat;cls.entity_prfx;cls.discovery_prfx;cls.proxy_node_id;cls.proxy_unique_id;cls.mqtt:Mqtt|]^[InverterG3|__ha_restarts|async_create_remote();async_publ_mqtt();;close()]
-[Inverter]^[InverterG3P|__ha_restarts|async_create_remote(;)async_publ_mqtt();close()]
-[Mqtt]-[Inverter]
-[ConnectionG3]^[InverterG3]
-[ConnectionG3]has-0..1>[ConnectionG3]
-[ConnectionG3P]^[InverterG3P]
-[ConnectionG3P]has-0..1>[ConnectionG3P]
+[<<AbstractIterMeta>>||__iter__()]
+
+[Mqtt;<<Singleton>>|<static>ha_restarts;<static>__client;<static>__cb_MqttIsUp|<async>publish();<async>close()]
+[Proxy|<cls>db_stat;<cls>entity_prfx;<cls>discovery_prfx;<cls>proxy_node_id;<cls>proxy_unique_id;<cls>mqtt:Mqtt;;__ha_restarts|class_init();class_close();;<async>_cb_mqtt_is_up();<async>_register_proxy_stat_home_assistant();<async>_async_publ_mqtt_proxy_stat(key)]
+
+[<<InverterIfc>>||healthy()->bool;<async>disc(shutdown_started=False);<async>create_remote();]
+[<<AbstractIterMeta>>]^-.-[<<InverterIfc>>]
+[InverterBase|_registry;__ha_restarts;;addr;config_id:str;prot_class:MessageProt;remote:StreamPtr;local:StreamPtr;|healthy()->bool;<async>disc(shutdown_started=False);<async>create_remote();<async>async_publ_mqtt()]
+[StreamPtr||stream:ProtocolIfc;ifc:AsyncIfc]
+[<<InverterIfc>>]^-.-[InverterBase]
+[InverterG3]-[note: Creates an GEN3 inverter instance with prot_class:Talent{bg:cornsilk}]
+[InverterG3P]-[note: Creates an GEN3PLUS inverter instance with prot_class:SolarmanV5{bg:cornsilk}]
+[InverterBase]^[InverterG3]
+[InverterBase]^[InverterG3P]
+[Proxy]^[InverterBase]
+[InverterBase]-2>[StreamPtr]
+[Proxy]++->[Mqtt;<<Singleton>>]
+
+[<<AsyncIfc>>]
+
+
+[StreamPtr]-1>[<<ProtocolIfc>>]
+[StreamPtr]-1>[<<AsyncIfc>>]
+
+
+[<<ProtocolIfc>>]use-.->[<<AsyncIfc>>]
+

-[Infos|stat;new_stat_data;info_dev|static_init();dev_value();inc_counter();dec_counter();ha_proxy_conf;ha_conf;ha_remove;update_db;set_db_def_value;get_db_value;ignore_this_device]^[InfosG3||ha_confs();parse()]
-[Infos]^[InfosG3P||ha_confs();parse()]
-[InfosG3P]->[SolarmanV5]
-[InfosG3]->[Talent]
 [ModbusConn|host;port;addr;stream:InverterG3P;|]has-1>[InverterG3P]
+[ModbusTcp]creates-*>[ModbusConn]

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+<text text-anchor="start" x="317.3425" y="-557" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">msg_get_time()</text>
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+<text text-anchor="start" x="316.5065" y="-521" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">msg_unknown()</text>
+<text text-anchor="start" x="332.62" y="-497" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">healthy()</text>
+<text text-anchor="start" x="337.0685" y="-485" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">close()</text>
+</g>
+<!-- A10&#45;&gt;A3 -->
+<g id="edge7" class="edge">
+<title>A10&#45;&gt;A3</title>
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+<text text-anchor="start" x="449.734" y="-267" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">parse()</text>
+</g>
+<!-- A10&#45;&gt;A12 -->
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+<title>A10&#45;&gt;A12</title>
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+<text text-anchor="start" x="437.8885" y="-515" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">ignore_this_device</text>
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+<!-- A11&#45;&gt;A12 -->
+<g id="edge11" class="edge">
+<title>A11&#45;&gt;A12</title>
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+<text text-anchor="start" x="165.8255" y="-1245" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">&lt;async&gt; end_modbus_cmd()</text>
+<text text-anchor="start" x="215.5685" y="-1233" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">close()</text>
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+</g>
+<!-- A13&#45;&gt;A5 -->
+<g id="edge13" class="edge">
+<title>A13&#45;&gt;A5</title>
+<path fill="none" stroke="#000000" d="M210.2965,-1195.7758C208.8462,-1182.5547 207.3854,-1169.2373 205.9406,-1156.0662"/>
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+<!-- A13&#45;&gt;A10 -->
+<g id="edge16" class="edge">
+<title>A13&#45;&gt;A10</title>
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+<!-- A14&#45;&gt;A13 -->
+<g id="edge15" class="edge">
+<title>A14&#45;&gt;A13</title>
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+<text text-anchor="start" x="266.5685" y="-1619" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">close()</text>
+</g>
+<!-- A15&#45;&gt;A13 -->
+<g id="edge17" class="edge">
+<title>A15&#45;&gt;A13</title>
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+<text text-anchor="middle" x="266.8039" y="-1569.8414" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">has</text>
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+</g>
+</svg>
--- a/app/proxy_2.yuml
+++ b/app/proxy_2.yuml
@@ -0,0 +1,43 @@
+// {type:class}
+// {direction:topDown}
+// {generate:true}
+
+[note: Example of instantiation for a GEN3 inverter!{bg:cornsilk}]
+[<<AbstractIterMeta>>||__iter__()]
+
+[InverterG3|addr;remote:StreamPtr;local:StreamPtr|create_remote();;close()]
+[InverterG3]++->[local:StreamPtr]
+[InverterG3]++->[remote:StreamPtr]
+
+[<<AsyncIfc>>||set_node_id();get_conn_no();;tx_add();tx_flush();tx_get();tx_peek();tx_log();tx_clear();tx_len();;fwd_add();fwd_log();rx_get();rx_peek();rx_log();rx_clear();rx_len();rx_set_cb();;prot_set_timeout_cb()]
+[AsyncIfcImpl|fwd_fifo:ByteFifo;tx_fifo:ByteFifo;rx_fifo:ByteFifo;conn_no:Count;node_id;timeout_cb]
+[AsyncStream|reader;writer;addr;r_addr;l_addr|;<async>loop;disc();close();healthy();;__async_read();__async_write();__async_forward()]
+[AsyncStreamServer|create_remote|<async>server_loop();<async>_async_forward();<async>publish_outstanding_mqtt();close()]
+[AsyncStreamClient||<async>client_loop();<async>_async_forward())]
+[<<AsyncIfc>>]^-.-[AsyncIfcImpl]
+[AsyncIfcImpl]^[AsyncStream]
+[AsyncStream]^[AsyncStreamServer]
+[AsyncStream]^[AsyncStreamClient]
+
+
+[Talent|conn_no;addr;;await_conn_resp_cnt;id_str;contact_name;contact_mail;db:InfosG3;mb:Modbus;switch|msg_contact_info();msg_ota_update();msg_get_time();msg_collector_data();msg_inverter_data();msg_unknown();;healthy();close()]
+[Talent]<-++[local:StreamPtr]
+[local:StreamPtr]++->[AsyncStreamServer]
+[Talent]<-0..1[remote:StreamPtr]
+[remote:StreamPtr]0..1->[AsyncStreamClient]
+
+[Infos|stat;new_stat_data;info_dev|static_init();dev_value();inc_counter();dec_counter();ha_proxy_conf;ha_conf;ha_remove;update_db;set_db_def_value;get_db_value;ignore_this_device]
+[Infos]^[InfosG3||ha_confs();parse()]
+
+[Talent]->[InfosG3]
+
+[Message|server_side:bool;mb:Modbus;ifc:AsyncIfc;node_id;header_valid:bool;header_len;data_len;unique_id;sug_area:str;new_data:dict;state:State;shutdown_started:bool;modbus_elms;mb_timer:Timer;mb_timeout;mb_first_timeout;modbus_polling:bool|_set_mqtt_timestamp();_timeout();_send_modbus_cmd();<async> end_modbus_cmd();close();inc_counter();dec_counter()]
+[Message]use->[<<AsyncIfc>>]
+
+[<<ProtocolIfc>>|_registry|close()]
+[<<AbstractIterMeta>>]^-.-[<<ProtocolIfc>>]
+[<<ProtocolIfc>>]^-.-[Message]
+[Message]^[Talent]
+
+[Modbus|que;;snd_handler;rsp_handler;timeout;max_retires;last_xxx;err;retry_cnt;req_pend;tim|build_msg();recv_req();recv_resp();close()]
+[Modbus]<0..1-has[Message]
--- a/app/proxy_3.svg
+++ b/app/proxy_3.svg
@@ -0,0 +1,364 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<!-- Generated by graphviz version 2.40.1 (20161225.0304)
+ -->
+<!-- Title: G Pages: 1 -->
+<svg width="539pt" height="1940pt"
+ viewBox="0.00 0.00 538.62 1940.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 1936)">
+<title>G</title>
+<polygon fill="#ffffff" stroke="transparent" points="-4,4 -4,-1936 534.6165,-1936 534.6165,4 -4,4"/>
+<!-- A0 -->
+<g id="node1" class="node">
+<title>A0</title>
+<polygon fill="#fff8dc" stroke="#000000" points="114.3497,-1912 -.1167,-1912 -.1167,-1868 120.3497,-1868 120.3497,-1906 114.3497,-1912"/>
+<polyline fill="none" stroke="#000000" points="114.3497,-1912 114.3497,-1906 "/>
+<polyline fill="none" stroke="#000000" points="120.3497,-1906 114.3497,-1906 "/>
+<text text-anchor="middle" x="60.1165" y="-1899" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">Example of</text>
+<text text-anchor="middle" x="60.1165" y="-1887" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">instantiation for a</text>
+<text text-anchor="middle" x="60.1165" y="-1875" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">GEN3PLUS inverter!</text>
+</g>
+<!-- A1 -->
+<g id="node2" class="node">
+<title>A1</title>
+<polygon fill="none" stroke="#000000" points="138.1165,-1900 138.1165,-1932 254.1165,-1932 254.1165,-1900 138.1165,-1900"/>
+<text text-anchor="start" x="147.7655" y="-1913" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">&lt;&lt;AbstractIterMeta&gt;&gt;</text>
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+<text text-anchor="start" x="174.7265" y="-1861" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">__iter__()</text>
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+<text text-anchor="start" x="181.119" y="-1637" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">close()</text>
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+<!-- A1&#45;&gt;A14 -->
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+<title>A1&#45;&gt;A14</title>
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+<title>A2</title>
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+<text text-anchor="start" x="241.1135" y="-613" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">addr</text>
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+<text text-anchor="start" x="215.5585" y="-557" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">create_remote()</text>
+<text text-anchor="start" x="236.119" y="-533" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">close()</text>
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+<!-- A3 -->
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+</g>
+<!-- A2&#45;&gt;A3 -->
+<g id="edge1" class="edge">
+<title>A2&#45;&gt;A3</title>
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+<!-- A4 -->
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+<text text-anchor="middle" x="251.1165" y="-299" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">remote:StreamPtr</text>
+</g>
+<!-- A2&#45;&gt;A4 -->
+<g id="edge2" class="edge">
+<title>A2&#45;&gt;A4</title>
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+<!-- A8 -->
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+<title>A8</title>
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+<text text-anchor="start" x="309.668" y="-113" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">AsyncStreamServer</text>
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+<text text-anchor="start" x="321.8875" y="-81" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">create_remote</text>
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+<text text-anchor="start" x="305.774" y="-49" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">&lt;async&gt;server_loop()</text>
+<text text-anchor="start" x="296.605" y="-37" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">&lt;async&gt;_async_forward()</text>
+<text text-anchor="start" x="274.9255" y="-25" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">&lt;async&gt;publish_outstanding_mqtt()</text>
+<text text-anchor="start" x="339.119" y="-13" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">close()</text>
+</g>
+<!-- A3&#45;&gt;A8 -->
+<g id="edge8" class="edge">
+<title>A3&#45;&gt;A8</title>
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+<!-- A9 -->
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+<title>A9</title>
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+<polygon fill="none" stroke="#000000" points="93.1165,-18 93.1165,-62 231.1165,-62 231.1165,-18 93.1165,-18"/>
+<text text-anchor="start" x="115.9945" y="-43" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">&lt;async&gt;client_loop()</text>
+<text text-anchor="start" x="102.9405" y="-31" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">&lt;async&gt;_async_forward())</text>
+</g>
+<!-- A4&#45;&gt;A9 -->
+<g id="edge10" class="edge">
+<title>A4&#45;&gt;A9</title>
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+<text text-anchor="middle" x="229.9759" y="-266.8956" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">0..1</text>
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+<!-- A5 -->
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+<title>A5</title>
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+<!-- A6 -->
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+<text text-anchor="start" x="109.166" y="-543" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">timeout_cb</text>
+</g>
+<!-- A5&#45;&gt;A6 -->
+<g id="edge3" class="edge">
+<title>A5&#45;&gt;A6</title>
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+<!-- A7 -->
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+<title>A7</title>
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+<text text-anchor="start" x="99.3905" y="-403" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">AsyncStream</text>
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+<text text-anchor="start" x="119.1135" y="-347" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">addr</text>
+<text text-anchor="start" x="114.6695" y="-335" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">r_addr</text>
+<text text-anchor="start" x="115.2245" y="-323" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">l_addr</text>
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+<text text-anchor="start" x="114.119" y="-255" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">close()</text>
+<text text-anchor="start" x="109.6705" y="-243" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">healthy()</text>
+<text text-anchor="start" x="94.387" y="-219" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">__async_read()</text>
+<text text-anchor="start" x="93.8375" y="-207" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">__async_write()</text>
+<text text-anchor="start" x="87.7235" y="-195" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">__async_forward()</text>
+</g>
+<!-- A6&#45;&gt;A7 -->
+<g id="edge4" class="edge">
+<title>A6&#45;&gt;A7</title>
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+<!-- A7&#45;&gt;A8 -->
+<g id="edge5" class="edge">
+<title>A7&#45;&gt;A8</title>
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+<!-- A7&#45;&gt;A9 -->
+<g id="edge6" class="edge">
+<title>A7&#45;&gt;A9</title>
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+<!-- A10 -->
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+<title>A10</title>
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+<text text-anchor="start" x="349.6145" y="-613" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">control</text>
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+<text text-anchor="start" x="357.6725" y="-589" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">snr</text>
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+<text text-anchor="start" x="329.057" y="-533" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">msg_unknown()</text>
+<text text-anchor="start" x="345.1705" y="-509" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">healthy()</text>
+<text text-anchor="start" x="349.619" y="-497" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">close()</text>
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+<!-- A10&#45;&gt;A3 -->
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+<title>A10&#45;&gt;A3</title>
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+<!-- A10&#45;&gt;A4 -->
+<g id="edge9" class="edge">
+<title>A10&#45;&gt;A4</title>
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+<!-- A12 -->
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+<text text-anchor="start" x="452.0005" y="-279" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">ha_confs()</text>
+<text text-anchor="start" x="459.7845" y="-267" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">parse()</text>
+</g>
+<!-- A10&#45;&gt;A12 -->
+<g id="edge12" class="edge">
+<title>A10&#45;&gt;A12</title>
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+<text text-anchor="start" x="453.501" y="-593" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">dev_value()</text>
+<text text-anchor="start" x="450.447" y="-581" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">inc_counter()</text>
+<text text-anchor="start" x="448.777" y="-569" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">dec_counter()</text>
+<text text-anchor="start" x="446.8265" y="-557" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">ha_proxy_conf</text>
+<text text-anchor="start" x="461.8295" y="-545" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">ha_conf</text>
+<text text-anchor="start" x="454.6105" y="-533" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">ha_remove</text>
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+<!-- A11&#45;&gt;A12 -->
+<g id="edge11" class="edge">
+<title>A11&#45;&gt;A12</title>
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+<title>A13</title>
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+<text text-anchor="start" x="218.8315" y="-1349" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">sug_area:str</text>
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+<text text-anchor="start" x="209.669" y="-1265" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">mb_first_timeout</text>
+<text text-anchor="start" x="200.7705" y="-1253" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">modbus_polling:bool</text>
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+<text text-anchor="start" x="195.501" y="-1221" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">_set_mqtt_timestamp()</text>
+<text text-anchor="start" x="224.1165" y="-1209" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">_timeout()</text>
+<text text-anchor="start" x="196.884" y="-1197" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">_send_modbus_cmd()</text>
+<text text-anchor="start" x="181.876" y="-1185" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">&lt;async&gt; end_modbus_cmd()</text>
+<text text-anchor="start" x="231.619" y="-1173" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">close()</text>
+<text text-anchor="start" x="217.447" y="-1161" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">inc_counter()</text>
+<text text-anchor="start" x="215.777" y="-1149" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">dec_counter()</text>
+</g>
+<!-- A13&#45;&gt;A5 -->
+<g id="edge13" class="edge">
+<title>A13&#45;&gt;A5</title>
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+<text text-anchor="middle" x="215.9686" y="-1115.6794" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">use</text>
+</g>
+<!-- A13&#45;&gt;A10 -->
+<g id="edge16" class="edge">
+<title>A13&#45;&gt;A10</title>
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+<!-- A14&#45;&gt;A13 -->
+<g id="edge15" class="edge">
+<title>A14&#45;&gt;A13</title>
+<path fill="none" stroke="#000000" stroke-dasharray="5,2" d="M204.2906,-1613.8004C208.8542,-1581.3079 214.8136,-1538.8764 220.7975,-1496.2713"/>
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+</g>
+<!-- A15 -->
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+<title>A15</title>
+<polygon fill="none" stroke="#000000" points="260.1165,-1766 260.1165,-1798 335.1165,-1798 335.1165,-1766 260.1165,-1766"/>
+<text text-anchor="start" x="279.834" y="-1779" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">Modbus</text>
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+<text text-anchor="start" x="276.4955" y="-1639" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">req_pend</text>
+<text text-anchor="start" x="290.953" y="-1627" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">tim</text>
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+<text text-anchor="start" x="271.5065" y="-1595" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">build_msg()</text>
+<text text-anchor="start" x="274.8405" y="-1583" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">recv_req()</text>
+<text text-anchor="start" x="272.3405" y="-1571" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">recv_resp()</text>
+<text text-anchor="start" x="282.619" y="-1559" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">close()</text>
+</g>
+<!-- A15&#45;&gt;A13 -->
+<g id="edge17" class="edge">
+<title>A15&#45;&gt;A13</title>
+<path fill="none" stroke="#000000" d="M277.6392,-1536.041C275.7633,-1522.9463 273.8413,-1509.5297 271.9169,-1496.0971"/>
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+<text text-anchor="middle" x="282.8544" y="-1509.8414" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">has</text>
+<text text-anchor="middle" x="268.1266" y="-1526.2424" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">0..1</text>
+</g>
+</g>
+</svg>
--- a/app/proxy_3.yuml
+++ b/app/proxy_3.yuml
@@ -0,0 +1,42 @@
+// {type:class}
+// {direction:topDown}
+// {generate:true}
+
+[note: Example of instantiation for a GEN3PLUS inverter!{bg:cornsilk}]
+[<<AbstractIterMeta>>||__iter__()]
+
+[InverterG3P|addr;remote:StreamPtr;local:StreamPtr|create_remote();;close()]
+[InverterG3P]++->[local:StreamPtr]
+[InverterG3P]++->[remote:StreamPtr]
+
+[<<AsyncIfc>>||set_node_id();get_conn_no();;tx_add();tx_flush();tx_get();tx_peek();tx_log();tx_clear();tx_len();;fwd_add();fwd_log();rx_get();rx_peek();rx_log();rx_clear();rx_len();rx_set_cb();;prot_set_timeout_cb()]
+[AsyncIfcImpl|fwd_fifo:ByteFifo;tx_fifo:ByteFifo;rx_fifo:ByteFifo;conn_no:Count;node_id;timeout_cb]
+[AsyncStream|reader;writer;addr;r_addr;l_addr|;<async>loop;disc();close();healthy();;__async_read();__async_write();__async_forward()]
+[AsyncStreamServer|create_remote|<async>server_loop();<async>_async_forward();<async>publish_outstanding_mqtt();close()]
+[AsyncStreamClient||<async>client_loop();<async>_async_forward())]
+[<<AsyncIfc>>]^-.-[AsyncIfcImpl]
+[AsyncIfcImpl]^[AsyncStream]
+[AsyncStream]^[AsyncStreamServer]
+[AsyncStream]^[AsyncStreamClient]
+
+[SolarmanV5|conn_no;addr;;control;serial;snr;db:InfosG3P;switch|msg_unknown();;healthy();close()]
+[SolarmanV5]<-++[local:StreamPtr]
+[local:StreamPtr]++->[AsyncStreamServer]
+[SolarmanV5]<-0..1[remote:StreamPtr]
+[remote:StreamPtr]0..1->[AsyncStreamClient]
+
+[Infos|stat;new_stat_data;info_dev|static_init();dev_value();inc_counter();dec_counter();ha_proxy_conf;ha_conf;ha_remove;update_db;set_db_def_value;get_db_value;ignore_this_device]
+[Infos]^[InfosG3P||ha_confs();parse()]
+
+[SolarmanV5]->[InfosG3P]
+
+[Message|server_side:bool;mb:Modbus;ifc:AsyncIfc;node_id;header_valid:bool;header_len;data_len;unique_id;sug_area:str;new_data:dict;state:State;shutdown_started:bool;modbus_elms;mb_timer:Timer;mb_timeout;mb_first_timeout;modbus_polling:bool|_set_mqtt_timestamp();_timeout();_send_modbus_cmd();<async> end_modbus_cmd();close();inc_counter();dec_counter()]
+[Message]use->[<<AsyncIfc>>]
+
+[<<ProtocolIfc>>|_registry|close()]
+[<<AbstractIterMeta>>]^-.-[<<ProtocolIfc>>]
+[<<ProtocolIfc>>]^-.-[Message]
+[Message]^[SolarmanV5]
+
+[Modbus|que;;snd_handler;rsp_handler;timeout;max_retires;last_xxx;err;retry_cnt;req_pend;tim|build_msg();recv_req();recv_resp();close()]
+[Modbus]<0..1-has[Message]
--- a/app/src/async_ifc.py
+++ b/app/src/async_ifc.py
@@ -0,0 +1,104 @@
+from abc import ABC, abstractmethod
+
+
+class AsyncIfc(ABC):
+    @abstractmethod
+    def get_conn_no(self):
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def set_node_id(self, value: str):
+        pass  # pragma: no cover
+
+    #
+    #  TX - QUEUE
+    #
+    @abstractmethod
+    def tx_add(self, data: bytearray):
+        ''' add data to transmit queue'''
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def tx_flush(self):
+        ''' send transmit queue and clears it'''
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def tx_peek(self, size: int = None) -> bytearray:
+        '''returns size numbers of byte without removing them'''
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def tx_log(self, level, info):
+        ''' log the transmit queue'''
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def tx_clear(self):
+        ''' clear transmit queue'''
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def tx_len(self):
+        ''' get numner of bytes in the transmit queue'''
+        pass  # pragma: no cover
+
+    #
+    #  FORWARD - QUEUE
+    #
+    @abstractmethod
+    def fwd_add(self, data: bytearray):
+        ''' add data to forward queue'''
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def fwd_log(self, level, info):
+        ''' log the forward queue'''
+        pass  # pragma: no cover
+
+    #
+    #  RX - QUEUE
+    #
+    @abstractmethod
+    def rx_get(self, size: int = None) -> bytearray:
+        '''removes size numbers of bytes and return them'''
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def rx_peek(self, size: int = None) -> bytearray:
+        '''returns size numbers of byte without removing them'''
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def rx_log(self, level, info):
+        ''' logs the receive queue'''
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def rx_clear(self):
+        ''' clear receive queue'''
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def rx_len(self):
+        ''' get numner of bytes in the receive queue'''
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def rx_set_cb(self, callback):
+        pass  # pragma: no cover
+
+    #
+    #  Protocol Callbacks
+    #
+    @abstractmethod
+    def prot_set_timeout_cb(self, callback):
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def prot_set_init_new_client_conn_cb(self, callback):
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def prot_set_update_header_cb(self, callback):
+        pass  # pragma: no cover
--- a/app/src/async_stream.py
+++ b/app/src/async_stream.py
@@ -7,17 +7,136 @@ from typing import Self
 from itertools import count

 if __name__ == "app.src.async_stream":
-    from app.src.messages import hex_dump_memory, State
+    from app.src.proxy import Proxy
+    from app.src.byte_fifo import ByteFifo
+    from app.src.async_ifc import AsyncIfc
+    from app.src.infos import Infos
 else:  # pragma: no cover
-    from messages import hex_dump_memory, State
+    from proxy import Proxy
+    from byte_fifo import ByteFifo
+    from async_ifc import AsyncIfc
+    from infos import Infos


 import gc
 logger = logging.getLogger('conn')


-class AsyncStream():
+class AsyncIfcImpl(AsyncIfc):
    _ids = count(0)
+
+    def __init__(self) -> None:
+        logger.debug('AsyncIfcImpl.__init__')
+        self.fwd_fifo = ByteFifo()
+        self.tx_fifo = ByteFifo()
+        self.rx_fifo = ByteFifo()
+        self.conn_no = next(self._ids)
+        self.node_id = ''
+        self.timeout_cb = None
+        self.init_new_client_conn_cb = None
+        self.update_header_cb = None
+
+    def close(self):
+        self.timeout_cb = None
+        self.fwd_fifo.reg_trigger(None)
+        self.tx_fifo.reg_trigger(None)
+        self.rx_fifo.reg_trigger(None)
+
+    def set_node_id(self, value: str):
+        self.node_id = value
+
+    def get_conn_no(self):
+        return self.conn_no
+
+    def tx_add(self, data: bytearray):
+        ''' add data to transmit queue'''
+        self.tx_fifo += data
+
+    def tx_flush(self):
+        ''' send transmit queue and clears it'''
+        self.tx_fifo()
+
+    def tx_peek(self, size: int = None) -> bytearray:
+        '''returns size numbers of byte without removing them'''
+        return self.tx_fifo.peek(size)
+
+    def tx_log(self, level, info):
+        ''' log the transmit queue'''
+        self.tx_fifo.logging(level, info)
+
+    def tx_clear(self):
+        ''' clear transmit queue'''
+        self.tx_fifo.clear()
+
+    def tx_len(self):
+        ''' get numner of bytes in the transmit queue'''
+        return len(self.tx_fifo)
+
+    def fwd_add(self, data: bytearray):
+        ''' add data to forward queue'''
+        self.fwd_fifo += data
+
+    def fwd_log(self, level, info):
+        ''' log the forward queue'''
+        self.fwd_fifo.logging(level, info)
+
+    def rx_get(self, size: int = None) -> bytearray:
+        '''removes size numbers of bytes and return them'''
+        return self.rx_fifo.get(size)
+
+    def rx_peek(self, size: int = None) -> bytearray:
+        '''returns size numbers of byte without removing them'''
+        return self.rx_fifo.peek(size)
+
+    def rx_log(self, level, info):
+        ''' logs the receive queue'''
+        self.rx_fifo.logging(level, info)
+
+    def rx_clear(self):
+        ''' clear receive queue'''
+        self.rx_fifo.clear()
+
+    def rx_len(self):
+        ''' get numner of bytes in the receive queue'''
+        return len(self.rx_fifo)
+
+    def rx_set_cb(self, callback):
+        self.rx_fifo.reg_trigger(callback)
+
+    def prot_set_timeout_cb(self, callback):
+        self.timeout_cb = callback
+
+    def prot_set_init_new_client_conn_cb(self, callback):
+        self.init_new_client_conn_cb = callback
+
+    def prot_set_update_header_cb(self, callback):
+        self.update_header_cb = callback
+
+
+class StreamPtr():
+    '''Descr StreamPtr'''
+    def __init__(self, _stream, _ifc=None):
+        self.stream = _stream
+        self.ifc = _ifc
+
+    @property
+    def ifc(self):
+        return self._ifc
+
+    @ifc.setter
+    def ifc(self, value):
+        self._ifc = value
+
+    @property
+    def stream(self):
+        return self._stream
+
+    @stream.setter
+    def stream(self, value):
+        self._stream = value
+
+
+class AsyncStream(AsyncIfcImpl):
    MAX_PROC_TIME = 2
    '''maximum processing time for a received msg in sec'''
    MAX_START_TIME = 400
@@ -28,95 +147,42 @@ class AsyncStream():
    '''maximum default time without a received msg in sec'''

    def __init__(self, reader: StreamReader, writer: StreamWriter,
-                 addr) -> None:
+                 rstream: "StreamPtr") -> None:
+        AsyncIfcImpl.__init__(self)
+
        logger.debug('AsyncStream.__init__')
-        self.reader = reader
-        self.writer = writer
-        self.addr = addr
-        self.r_addr = ''
-        self.l_addr = ''
-        self.conn_no = next(self._ids)
+
+        self.remote = rstream
+        self.tx_fifo.reg_trigger(self.__write_cb)
+        self._reader = reader
+        self._writer = writer
+        self.r_addr = writer.get_extra_info('peername')
+        self.l_addr = writer.get_extra_info('sockname')
        self.proc_start = None  # start processing start timestamp
        self.proc_max = 0
+        self.async_publ_mqtt = None  # will be set AsyncStreamServer only
+
+    def __write_cb(self):
+        self._writer.write(self.tx_fifo.get())

    def __timeout(self) -> int:
-        if self.state == State.init or self.state == State.received:
-            to = self.MAX_START_TIME
-        elif self.state == State.up and \
-                self.server_side and self.modbus_polling:
-            to = self.MAX_INV_IDLE_TIME
-        else:
-            to = self.MAX_DEF_IDLE_TIME
-        return to
-
-    async def publish_outstanding_mqtt(self):
-        '''Publish all outstanding MQTT topics'''
-        try:
-            if self.unique_id:
-                await self.async_publ_mqtt()
-            await self._async_publ_mqtt_proxy_stat('proxy')
-        except Exception:
-            pass
-
-    async def server_loop(self, addr: str) -> None:
-        '''Loop for receiving messages from the inverter (server-side)'''
-        logger.info(f'[{self.node_id}:{self.conn_no}] '
-                    f'Accept connection from {addr}')
-        self.inc_counter('Inverter_Cnt')
-        await self.publish_outstanding_mqtt()
-        await self.loop()
-        self.dec_counter('Inverter_Cnt')
-        await self.publish_outstanding_mqtt()
-        logger.info(f'[{self.node_id}:{self.conn_no}] Server loop stopped for'
-                    f' r{self.r_addr}')
-
-        # if the server connection closes, we also have to disconnect
-        # the connection to te TSUN cloud
-        if self.remote_stream:
-            logger.info(f'[{self.node_id}:{self.conn_no}] disc client '
-                        f'connection: [{self.remote_stream.node_id}:'
-                        f'{self.remote_stream.conn_no}]')
-            await self.remote_stream.disc()
-
-    async def client_loop(self, _: str) -> None:
-        '''Loop for receiving messages from the TSUN cloud (client-side)'''
-        client_stream = await self.remote_stream.loop()
-        logger.info(f'[{client_stream.node_id}:{client_stream.conn_no}] '
-                    'Client loop stopped for'
-                    f' l{client_stream.l_addr}')
-
-        # if the client connection closes, we don't touch the server
-        # connection. Instead we erase the client connection stream,
-        # thus on the next received packet from the inverter, we can
-        # establish a new connection to the TSUN cloud
-
-        # erase backlink to inverter
-        client_stream.remote_stream = None
-
-        if self.remote_stream == client_stream:
-            # logging.debug(f'Client l{client_stream.l_addr} refs:'
-            #               f' {gc.get_referrers(client_stream)}')
-            # than erase client connection
-            self.remote_stream = None
+        if self.timeout_cb:
+            return self.timeout_cb()
+        return 360

    async def loop(self) -> Self:
        """Async loop handler for precessing all received messages"""
-        self.r_addr = self.writer.get_extra_info('peername')
-        self.l_addr = self.writer.get_extra_info('sockname')
        self.proc_start = time.time()
        while True:
            try:
-                proc = time.time() - self.proc_start
-                if proc > self.proc_max:
-                    self.proc_max = proc
-                self.proc_start = None
+                self.__calc_proc_time()
                dead_conn_to = self.__timeout()
                await asyncio.wait_for(self.__async_read(),
                                       dead_conn_to)

-                if self.unique_id:
-                    await self.async_write()
-                    await self.__async_forward()
+                await self.__async_write()
+                await self.__async_forward()
+                if self.async_publ_mqtt:
                    await self.async_publ_mqtt()

            except asyncio.TimeoutError:
@@ -124,7 +190,6 @@ class AsyncStream():
                               f'connection timeout ({dead_conn_to}s) '
                               f'for {self.l_addr}')
                await self.disc()
-                self.close()
                return self

            except OSError as error:
@@ -132,56 +197,53 @@ class AsyncStream():
                             f'{error} for l{self.l_addr} | '
                             f'r{self.r_addr}')
                await self.disc()
-                self.close()
                return self

            except RuntimeError as error:
                logger.info(f'[{self.node_id}:{self.conn_no}] '
                            f'{error} for {self.l_addr}')
                await self.disc()
-                self.close()
                return self

            except Exception:
-                self.inc_counter('SW_Exception')
+                Infos.inc_counter('SW_Exception')
                logger.error(
-                    f"Exception for {self.addr}:\n"
+                    f"Exception for {self.r_addr}:\n"
                    f"{traceback.format_exc()}")
            await asyncio.sleep(0)  # be cooperative to other task

-    async def async_write(self, headline: str = 'Transmit to ') -> None:
-        """Async write handler to transmit the send_buffer"""
-        if self._send_buffer:
-            hex_dump_memory(logging.INFO, f'{headline}{self.addr}:',
-                            self._send_buffer, len(self._send_buffer))
-            self.writer.write(self._send_buffer)
-            await self.writer.drain()
-            self._send_buffer = bytearray(0)  # self._send_buffer[sent:]
+    def __calc_proc_time(self):
+        if self.proc_start:
+            proc = time.time() - self.proc_start
+            if proc > self.proc_max:
+                self.proc_max = proc
+            self.proc_start = None

    async def disc(self) -> None:
        """Async disc handler for graceful disconnect"""
-        if self.writer.is_closing():
+        if self._writer.is_closing():
            return
        logger.debug(f'AsyncStream.disc() l{self.l_addr} | r{self.r_addr}')
-        self.writer.close()
-        await self.writer.wait_closed()
+        self._writer.close()
+        await self._writer.wait_closed()

    def close(self) -> None:
+        logging.debug(f'AsyncStream.close() l{self.l_addr} | r{self.r_addr}')
        """close handler for a no waiting disconnect

           hint: must be called before releasing the connection instance
        """
-        self.reader.feed_eof()          # abort awaited read
-        if self.writer.is_closing():
+        super().close()
+        self._reader.feed_eof()          # abort awaited read
+        if self._writer.is_closing():
            return
-        logger.debug(f'AsyncStream.close() l{self.l_addr} | r{self.r_addr}')
-        self.writer.close()
+        self._writer.close()

    def healthy(self) -> bool:
        elapsed = 0
        if self.proc_start is not None:
            elapsed = time.time() - self.proc_start
-        if self.state == State.closed or elapsed > self.MAX_PROC_TIME:
+        if elapsed > self.MAX_PROC_TIME:
            logging.debug(f'[{self.node_id}:{self.conn_no}:'
                          f'{type(self).__name__}]'
                          f' act:{round(1000*elapsed)}ms'
@@ -194,61 +256,148 @@ class AsyncStream():
    '''
    async def __async_read(self) -> None:
        """Async read handler to read received data from TCP stream"""
-        data = await self.reader.read(4096)
+        data = await self._reader.read(4096)
        if data:
            self.proc_start = time.time()
-            self._recv_buffer += data
-            wait = self.read()                # call read in parent class
-            if wait > 0:
+            self.rx_fifo += data
+            wait = self.rx_fifo()                # call read in parent class
+            if wait and wait > 0:
                await asyncio.sleep(wait)
        else:
            raise RuntimeError("Peer closed.")

+    async def __async_write(self, headline: str = 'Transmit to ') -> None:
+        """Async write handler to transmit the send_buffer"""
+        if len(self.tx_fifo) > 0:
+            self.tx_fifo.logging(logging.INFO, f'{headline}{self.r_addr}:')
+            self._writer.write(self.tx_fifo.get())
+            await self._writer.drain()
+
    async def __async_forward(self) -> None:
        """forward handler transmits data over the remote connection"""
-        if not self._forward_buffer:
+        if len(self.fwd_fifo) == 0:
            return
        try:
-            if not self.remote_stream:
-                await self.async_create_remote()
-                if self.remote_stream:
-                    if self.remote_stream._init_new_client_conn():
-                        await self.remote_stream.async_write()
-
-            if self.remote_stream:
-                self.remote_stream._update_header(self._forward_buffer)
-                hex_dump_memory(logging.INFO,
-                                f'Forward to {self.remote_stream.addr}:',
-                                self._forward_buffer,
-                                len(self._forward_buffer))
-                self.remote_stream.writer.write(self._forward_buffer)
-                await self.remote_stream.writer.drain()
-                self._forward_buffer = bytearray(0)
+            await self._async_forward()

        except OSError as error:
-            if self.remote_stream:
-                rmt = self.remote_stream
-                self.remote_stream = None
-                logger.error(f'[{rmt.node_id}:{rmt.conn_no}] Fwd: {error} for '
-                             f'l{rmt.l_addr} | r{rmt.r_addr}')
-                await rmt.disc()
-                rmt.close()
+            if self.remote.stream:
+                rmt = self.remote
+                logger.error(f'[{rmt.stream.node_id}:{rmt.stream.conn_no}] '
+                             f'Fwd: {error} for '
+                             f'l{rmt.ifc.l_addr} | r{rmt.ifc.r_addr}')
+                await rmt.ifc.disc()
+                if rmt.ifc.close_cb:
+                    rmt.ifc.close_cb()

        except RuntimeError as error:
-            if self.remote_stream:
-                rmt = self.remote_stream
-                self.remote_stream = None
-                logger.info(f'[{rmt.node_id}:{rmt.conn_no}] '
-                            f'Fwd: {error} for {rmt.l_addr}')
-                await rmt.disc()
-                rmt.close()
+            if self.remote.stream:
+                rmt = self.remote
+                logger.info(f'[{rmt.stream.node_id}:{rmt.stream.conn_no}] '
+                            f'Fwd: {error} for {rmt.ifc.l_addr}')
+                await rmt.ifc.disc()
+                if rmt.ifc.close_cb:
+                    rmt.ifc.close_cb()

        except Exception:
-            self.inc_counter('SW_Exception')
+            Infos.inc_counter('SW_Exception')
            logger.error(
-                f"Fwd Exception for {self.addr}:\n"
+                f"Fwd Exception for {self.r_addr}:\n"
                f"{traceback.format_exc()}")

-    def __del__(self):
-        logger.debug(
-            f"AsyncStream.__del__  l{self.l_addr} | r{self.r_addr}")
+    async def publish_outstanding_mqtt(self):
+        '''Publish all outstanding MQTT topics'''
+        try:
+            await self.async_publ_mqtt()
+            await Proxy._async_publ_mqtt_proxy_stat('proxy')
+        except Exception:
+            pass
+
+
+class AsyncStreamServer(AsyncStream):
+    def __init__(self, reader: StreamReader, writer: StreamWriter,
+                 async_publ_mqtt, create_remote,
+                 rstream: "StreamPtr") -> None:
+        AsyncStream.__init__(self, reader, writer, rstream)
+        self.create_remote = create_remote
+        self.async_publ_mqtt = async_publ_mqtt
+
+    def close(self) -> None:
+        logging.debug('AsyncStreamServer.close()')
+        self.create_remote = None
+        self.async_publ_mqtt = None
+        super().close()
+
+    async def server_loop(self) -> None:
+        '''Loop for receiving messages from the inverter (server-side)'''
+        logger.info(f'[{self.node_id}:{self.conn_no}] '
+                    f'Accept connection from {self.r_addr}')
+        Infos.inc_counter('Inverter_Cnt')
+        await self.publish_outstanding_mqtt()
+        await self.loop()
+        Infos.dec_counter('Inverter_Cnt')
+        await self.publish_outstanding_mqtt()
+        logger.info(f'[{self.node_id}:{self.conn_no}] Server loop stopped for'
+                    f' r{self.r_addr}')
+
+        # if the server connection closes, we also have to disconnect
+        # the connection to te TSUN cloud
+        if self.remote and self.remote.stream:
+            logger.info(f'[{self.node_id}:{self.conn_no}] disc client '
+                        f'connection: [{self.remote.ifc.node_id}:'
+                        f'{self.remote.ifc.conn_no}]')
+            await self.remote.ifc.disc()
+
+    async def _async_forward(self) -> None:
+        """forward handler transmits data over the remote connection"""
+        if not self.remote.stream:
+            await self.create_remote()
+            if self.remote.stream and \
+               self.remote.ifc.init_new_client_conn_cb():
+                await self.remote.ifc._AsyncStream__async_write()
+        if self.remote.stream:
+            self.remote.ifc.update_header_cb(self.fwd_fifo.peek())
+            self.fwd_fifo.logging(logging.INFO, 'Forward to '
+                                  f'{self.remote.ifc.r_addr}:')
+            self.remote.ifc._writer.write(self.fwd_fifo.get())
+            await self.remote.ifc._writer.drain()
+
+
+class AsyncStreamClient(AsyncStream):
+    def __init__(self, reader: StreamReader, writer: StreamWriter,
+                 rstream: "StreamPtr", close_cb) -> None:
+        AsyncStream.__init__(self, reader, writer, rstream)
+        self.close_cb = close_cb
+
+    async def disc(self) -> None:
+        logging.debug('AsyncStreamClient.disc()')
+        self.remote = None
+        await super().disc()
+
+    def close(self) -> None:
+        logging.debug('AsyncStreamClient.close()')
+        self.close_cb = None
+        super().close()
+
+    async def client_loop(self, _: str) -> None:
+        '''Loop for receiving messages from the TSUN cloud (client-side)'''
+        Infos.inc_counter('Cloud_Conn_Cnt')
+        await self.publish_outstanding_mqtt()
+        await self.loop()
+        Infos.dec_counter('Cloud_Conn_Cnt')
+        await self.publish_outstanding_mqtt()
+        logger.info(f'[{self.node_id}:{self.conn_no}] '
+                    'Client loop stopped for'
+                    f' l{self.l_addr}')
+
+        if self.close_cb:
+            self.close_cb()
+
+    async def _async_forward(self) -> None:
+        """forward handler transmits data over the remote connection"""
+        if self.remote.stream:
+            self.remote.ifc.update_header_cb(self.fwd_fifo.peek())
+            self.fwd_fifo.logging(logging.INFO, 'Forward to '
+                                  f'{self.remote.ifc.r_addr}:')
+            self.remote.ifc._writer.write(self.fwd_fifo.get())
+            await self.remote.ifc._writer.drain()
--- a/app/src/byte_fifo.py
+++ b/app/src/byte_fifo.py
@@ -0,0 +1,56 @@
+
+if __name__ == "app.src.byte_fifo":
+    from app.src.messages import hex_dump_str, hex_dump_memory
+else:  # pragma: no cover
+    from messages import hex_dump_str, hex_dump_memory
+
+
+class ByteFifo:
+    """ a byte FIFO buffer with trigger callback """
+    __slots__ = ('__buf', '__trigger_cb')
+
+    def __init__(self):
+        self.__buf = bytearray()
+        self.__trigger_cb = None
+
+    def reg_trigger(self, cb) -> None:
+        self.__trigger_cb = cb
+
+    def __iadd__(self, data):
+        self.__buf.extend(data)
+        return self
+
+    def __call__(self):
+        '''triggers the observer'''
+        if callable(self.__trigger_cb):
+            return self.__trigger_cb()
+        return None
+
+    def get(self, size: int = None) -> bytearray:
+        '''removes size numbers of byte and return them'''
+        if not size:
+            data = self.__buf
+            self.clear()
+        else:
+            data = self.__buf[:size]
+            # The fast delete syntax
+            self.__buf[:size] = b''
+        return data
+
+    def peek(self, size: int = None) -> bytearray:
+        '''returns size numbers of byte without removing them'''
+        if not size:
+            return self.__buf
+        return self.__buf[:size]
+
+    def clear(self):
+        self.__buf = bytearray()
+
+    def __len__(self) -> int:
+        return len(self.__buf)
+
+    def __str__(self) -> str:
+        return hex_dump_str(self.__buf, self.__len__())
+
+    def logging(self, level, info):
+        hex_dump_memory(level, info, self.__buf, self.__len__())
--- a/app/src/config.py
+++ b/app/src/config.py
@@ -57,7 +57,8 @@ class Config():
                Optional('client_mode'): {
                    'host': Use(str),
                    Optional('port', default=8899):
-                        And(Use(int), lambda n: 1024 <= n <= 65535)
+                        And(Use(int), lambda n: 1024 <= n <= 65535),
+                    Optional('forward', default=False): Use(bool),
                },
                Optional('modbus_polling', default=True): Use(bool),
                Optional('suggested_area', default=""): Use(str),
--- a/app/src/gen3/connection_g3.py
+++ b/app/src/gen3/connection_g3.py
@@ -1,41 +0,0 @@
-import logging
-from asyncio import StreamReader, StreamWriter
-from async_stream import AsyncStream
-from gen3.talent import Talent
-
-logger = logging.getLogger('conn')
-
-
-class ConnectionG3(AsyncStream, Talent):
-
-    def __init__(self, reader: StreamReader, writer: StreamWriter,
-                 addr, remote_stream: 'ConnectionG3', server_side: bool,
-                 id_str=b'') -> None:
-        AsyncStream.__init__(self, reader, writer, addr)
-        Talent.__init__(self, server_side, id_str)
-
-        self.remote_stream: 'ConnectionG3' = remote_stream
-
-    '''
-    Our puplic methods
-    '''
-    def close(self):
-        AsyncStream.close(self)
-        Talent.close(self)
-        # logger.info(f'AsyncStream refs: {gc.get_referrers(self)}')
-
-    async def async_create_remote(self) -> None:
-        pass  # virtual interface # pragma: no cover
-
-    async def async_publ_mqtt(self) -> None:
-        pass  # virtual interface # pragma: no cover
-
-    def healthy(self) -> bool:
-        logger.debug('ConnectionG3 healthy()')
-        return AsyncStream.healthy(self)
-
-    '''
-    Our private methods
-    '''
-    def __del__(self):
-        super().__del__()
--- a/app/src/gen3/infos_g3.py
+++ b/app/src/gen3/infos_g3.py
@@ -10,87 +10,86 @@ else:  # pragma: no cover


 class RegisterMap:
+    __slots__ = ()
+
    map = {
-        0x00092ba8: Register.COLLECTOR_FW_VERSION,
-        0x000927c0: Register.CHIP_TYPE,
-        0x00092f90: Register.CHIP_MODEL,
-        0x00094ae8: Register.MAC_ADDR,
-        0x00095a88: Register.TRACE_URL,
-        0x00095aec: Register.LOGGER_URL,
-        0x0000000a: Register.PRODUCT_NAME,
-        0x00000014: Register.MANUFACTURER,
-        0x0000001e: Register.VERSION,
-        0x00000028: Register.SERIAL_NUMBER,
-        0x00000032: Register.EQUIPMENT_MODEL,
-        0x00013880: Register.NO_INPUTS,
-        0xffffff00: Register.INVERTER_CNT,
-        0xffffff01: Register.UNKNOWN_SNR,
-        0xffffff02: Register.UNKNOWN_MSG,
-        0xffffff03: Register.INVALID_DATA_TYPE,
-        0xffffff04: Register.INTERNAL_ERROR,
-        0xffffff05: Register.UNKNOWN_CTRL,
-        0xffffff06: Register.OTA_START_MSG,
-        0xffffff07: Register.SW_EXCEPTION,
-        0xffffff08: Register.MAX_DESIGNED_POWER,
-        0xffffff09: Register.OUTPUT_COEFFICIENT,
-        0xffffff0a: Register.INVERTER_STATUS,
-        0xffffff0b: Register.POLLING_INTERVAL,
-        0xfffffffe: Register.TEST_REG1,
-        0xffffffff: Register.TEST_REG2,
-        0x00000640: Register.OUTPUT_POWER,
-        0x000005dc: Register.RATED_POWER,
-        0x00000514: Register.INVERTER_TEMP,
-        0x000006a4: Register.PV1_VOLTAGE,
-        0x00000708: Register.PV1_CURRENT,
-        0x0000076c: Register.PV1_POWER,
-        0x000007d0: Register.PV2_VOLTAGE,
-        0x00000834: Register.PV2_CURRENT,
-        0x00000898: Register.PV2_POWER,
-        0x000008fc: Register.PV3_VOLTAGE,
-        0x00000960: Register.PV3_CURRENT,
-        0x000009c4: Register.PV3_POWER,
-        0x00000a28: Register.PV4_VOLTAGE,
-        0x00000a8c: Register.PV4_CURRENT,
-        0x00000af0: Register.PV4_POWER,
-        0x00000c1c: Register.PV1_DAILY_GENERATION,
-        0x00000c80: Register.PV1_TOTAL_GENERATION,
-        0x00000ce4: Register.PV2_DAILY_GENERATION,
-        0x00000d48: Register.PV2_TOTAL_GENERATION,
-        0x00000dac: Register.PV3_DAILY_GENERATION,
-        0x00000e10: Register.PV3_TOTAL_GENERATION,
-        0x00000e74: Register.PV4_DAILY_GENERATION,
-        0x00000ed8: Register.PV4_TOTAL_GENERATION,
-        0x00000b54: Register.DAILY_GENERATION,
-        0x00000bb8: Register.TOTAL_GENERATION,
-        0x000003e8: Register.GRID_VOLTAGE,
-        0x0000044c: Register.GRID_CURRENT,
-        0x000004b0: Register.GRID_FREQUENCY,
-        0x000cfc38: Register.CONNECT_COUNT,
-        0x000c3500: Register.SIGNAL_STRENGTH,
-        0x000c96a8: Register.POWER_ON_TIME,
-        0x000d0020: Register.COLLECT_INTERVAL,
-        0x000cf850: Register.DATA_UP_INTERVAL,
-        0x000c7f38: Register.COMMUNICATION_TYPE,
-        0x00000191: Register.EVENT_401,
-        0x00000192: Register.EVENT_402,
-        0x00000193: Register.EVENT_403,
-        0x00000194: Register.EVENT_404,
-        0x00000195: Register.EVENT_405,
-        0x00000196: Register.EVENT_406,
-        0x00000197: Register.EVENT_407,
-        0x00000198: Register.EVENT_408,
-        0x00000199: Register.EVENT_409,
-        0x0000019a: Register.EVENT_410,
-        0x0000019b: Register.EVENT_411,
-        0x0000019c: Register.EVENT_412,
-        0x0000019d: Register.EVENT_413,
-        0x0000019e: Register.EVENT_414,
-        0x0000019f: Register.EVENT_415,
-        0x000001a0: Register.EVENT_416,
+        0x00092ba8: {'reg': Register.COLLECTOR_FW_VERSION},
+        0x000927c0: {'reg': Register.CHIP_TYPE},
+        0x00092f90: {'reg': Register.CHIP_MODEL},
+        0x00094ae8: {'reg': Register.MAC_ADDR},
+        0x00095a88: {'reg': Register.TRACE_URL},
+        0x00095aec: {'reg': Register.LOGGER_URL},
+        0x0000000a: {'reg': Register.PRODUCT_NAME},
+        0x00000014: {'reg': Register.MANUFACTURER},
+        0x0000001e: {'reg': Register.VERSION},
+        0x00000028: {'reg': Register.SERIAL_NUMBER},
+        0x00000032: {'reg': Register.EQUIPMENT_MODEL},
+        0x00013880: {'reg': Register.NO_INPUTS},
+        0xffffff00: {'reg': Register.INVERTER_CNT},
+        0xffffff01: {'reg': Register.UNKNOWN_SNR},
+        0xffffff02: {'reg': Register.UNKNOWN_MSG},
+        0xffffff03: {'reg': Register.INVALID_DATA_TYPE},
+        0xffffff04: {'reg': Register.INTERNAL_ERROR},
+        0xffffff05: {'reg': Register.UNKNOWN_CTRL},
+        0xffffff06: {'reg': Register.OTA_START_MSG},
+        0xffffff07: {'reg': Register.SW_EXCEPTION},
+        0xffffff08: {'reg': Register.POLLING_INTERVAL},
+        0xfffffffe: {'reg': Register.TEST_REG1},
+        0xffffffff: {'reg': Register.TEST_REG2},
+        0x00000640: {'reg': Register.OUTPUT_POWER},
+        0x000005dc: {'reg': Register.RATED_POWER},
+        0x00000514: {'reg': Register.INVERTER_TEMP},
+        0x000006a4: {'reg': Register.PV1_VOLTAGE},
+        0x00000708: {'reg': Register.PV1_CURRENT},
+        0x0000076c: {'reg': Register.PV1_POWER},
+        0x000007d0: {'reg': Register.PV2_VOLTAGE},
+        0x00000834: {'reg': Register.PV2_CURRENT},
+        0x00000898: {'reg': Register.PV2_POWER},
+        0x000008fc: {'reg': Register.PV3_VOLTAGE},
+        0x00000960: {'reg': Register.PV3_CURRENT},
+        0x000009c4: {'reg': Register.PV3_POWER},
+        0x00000a28: {'reg': Register.PV4_VOLTAGE},
+        0x00000a8c: {'reg': Register.PV4_CURRENT},
+        0x00000af0: {'reg': Register.PV4_POWER},
+        0x00000c1c: {'reg': Register.PV1_DAILY_GENERATION},
+        0x00000c80: {'reg': Register.PV1_TOTAL_GENERATION},
+        0x00000ce4: {'reg': Register.PV2_DAILY_GENERATION},
+        0x00000d48: {'reg': Register.PV2_TOTAL_GENERATION},
+        0x00000dac: {'reg': Register.PV3_DAILY_GENERATION},
+        0x00000e10: {'reg': Register.PV3_TOTAL_GENERATION},
+        0x00000e74: {'reg': Register.PV4_DAILY_GENERATION},
+        0x00000ed8: {'reg': Register.PV4_TOTAL_GENERATION},
+        0x00000b54: {'reg': Register.DAILY_GENERATION},
+        0x00000bb8: {'reg': Register.TOTAL_GENERATION},
+        0x000003e8: {'reg': Register.GRID_VOLTAGE},
+        0x0000044c: {'reg': Register.GRID_CURRENT},
+        0x000004b0: {'reg': Register.GRID_FREQUENCY},
+        0x000cfc38: {'reg': Register.CONNECT_COUNT},
+        0x000c3500: {'reg': Register.SIGNAL_STRENGTH},
+        0x000c96a8: {'reg': Register.POWER_ON_TIME},
+        0x000d0020: {'reg': Register.COLLECT_INTERVAL},
+        0x000cf850: {'reg': Register.DATA_UP_INTERVAL},
+        0x000c7f38: {'reg': Register.COMMUNICATION_TYPE},
+        0x00000190: {'reg': Register.EVENT_ALARM},
+        0x000001f4: {'reg': Register.EVENT_FAULT},
+        0x00000258: {'reg': Register.EVENT_BF1},
+        0x000002bc: {'reg': Register.EVENT_BF2},
+        0x00000064: {'reg': Register.INVERTER_STATUS},
+
+        0x00000fa0: {'reg': Register.BOOT_STATUS},
+        0x00001004: {'reg': Register.DSP_STATUS},
+        0x000010cc: {'reg': Register.WORK_MODE},
+        0x000011f8: {'reg': Register.OUTPUT_SHUTDOWN},
+        0x0000125c: {'reg': Register.MAX_DESIGNED_POWER},
+        0x000012c0: {'reg': Register.RATED_LEVEL},
+        0x00001324: {'reg': Register.INPUT_COEFFICIENT, 'ratio':  100/1024},
+        0x00001388: {'reg': Register.GRID_VOLT_CAL_COEF},
+        0x00003200: {'reg': Register.OUTPUT_COEFFICIENT, 'ratio':  100/1024},
    }


 class InfosG3(Infos):
+    __slots__ = ()

    def ha_confs(self, ha_prfx: str, node_id: str, snr: str,
                 sug_area: str = '') \
@@ -104,7 +103,8 @@ class InfosG3(Infos):
                         entity strings
        sug_area:str ==> suggested area string from the config file'''
        # iterate over RegisterMap.map and get the register values
-        for reg in RegisterMap.map.values():
+        for row in RegisterMap.map.values():
+            reg = row['reg']
            res = self.ha_conf(reg, ha_prfx, node_id, snr, False, sug_area)  # noqa: E501
            if res:
                yield res
@@ -123,9 +123,11 @@ class InfosG3(Infos):
            result = struct.unpack_from('!lB', buf, ind)
            addr = result[0]
            if addr not in RegisterMap.map:
+                row = None
                info_id = -1
            else:
-                info_id = RegisterMap.map[addr]
+                row = RegisterMap.map[addr]
+                info_id = row['reg']
            data_type = result[1]
            ind += 5

@@ -171,9 +173,16 @@ class InfosG3(Infos):
                              " not supported")
                return

+            result = self.__modify_val(row, result)
+
            yield from self.__store_result(addr, result, info_id, node_id)
            i += 1

+    def __modify_val(self, row, result):
+        if row and 'ratio' in row:
+            result = round(result * row['ratio'], 2)
+        return result
+
    def __store_result(self, addr, result, info_id, node_id):
        keys, level, unit, must_incr = self._key_obj(info_id)
        if keys:
--- a/app/src/gen3/inverter_g3.py
+++ b/app/src/gen3/inverter_g3.py
@@ -1,130 +1,12 @@
-import logging
-import traceback
-import json
-import asyncio
 from asyncio import StreamReader, StreamWriter
-from config import Config
-from inverter import Inverter
-from gen3.connection_g3 import ConnectionG3
-from aiomqtt import MqttCodeError
-from infos import Infos
+if __name__ == "app.src.gen3.inverter_g3":
+    from app.src.inverter_base import InverterBase
+    from app.src.gen3.talent import Talent
+else:  # pragma: no cover
+    from inverter_base import InverterBase
+    from gen3.talent import Talent


-logger_mqtt = logging.getLogger('mqtt')
-
-
-class InverterG3(Inverter, ConnectionG3):
-    '''class Inverter is a derivation of an Async_Stream
-
-    The class has some class method for managing common resources like a
-    connection to the MQTT broker or proxy error counter which are common
-    for all inverter connection
-
-    Instances of the class are connections to an inverter and can have an
-    optional link to an remote connection to the TSUN cloud. A remote
-    connection dies with the inverter connection.
-
-    class methods:
-        class_init():  initialize the common resources of the proxy (MQTT
-                       broker, Proxy DB, etc). Must be called before the
-                       first inverter instance can be created
-        class_close(): release the common resources of the proxy. Should not
-                       be called before any instances of the class are
-                       destroyed
-
-    methods:
-        server_loop(addr): Async loop method for receiving messages from the
-                           inverter (server-side)
-        client_loop(addr): Async loop method for receiving messages from the
-                           TSUN cloud (client-side)
-        async_create_remote(): Establish a client connection to the TSUN cloud
-        async_publ_mqtt(): Publish data to MQTT broker
-        close(): Release method which must be called before a instance can be
-                 destroyed
-    '''
-
-    def __init__(self, reader: StreamReader, writer: StreamWriter, addr):
-        super().__init__(reader, writer, addr, None, True)
-        self.__ha_restarts = -1
-
-    async def async_create_remote(self) -> None:
-        '''Establish a client connection to the TSUN cloud'''
-        tsun = Config.get('tsun')
-        host = tsun['host']
-        port = tsun['port']
-        addr = (host, port)
-
-        try:
-            logging.info(f'[{self.node_id}] Connect to {addr}')
-            connect = asyncio.open_connection(host, port)
-            reader, writer = await connect
-            self.remote_stream = ConnectionG3(reader, writer, addr, self,
-                                              False, self.id_str)
-            logging.info(f'[{self.remote_stream.node_id}:'
-                         f'{self.remote_stream.conn_no}] '
-                         f'Connected to {addr}')
-            asyncio.create_task(self.client_loop(addr))
-
-        except (ConnectionRefusedError, TimeoutError) as error:
-            logging.info(f'{error}')
-        except Exception:
-            self.inc_counter('SW_Exception')
-            logging.error(
-                f"Inverter: Exception for {addr}:\n"
-                f"{traceback.format_exc()}")
-
-    async def async_publ_mqtt(self) -> None:
-        '''publish data to MQTT broker'''
-        # check if new inverter or collector infos are available or when the
-        #  home assistant has changed the status back to online
-        try:
-            if (('inverter' in self.new_data and self.new_data['inverter'])
-                    or ('collector' in self.new_data and
-                        self.new_data['collector'])
-                    or self.mqtt.ha_restarts != self.__ha_restarts):
-                await self._register_proxy_stat_home_assistant()
-                await self.__register_home_assistant()
-                self.__ha_restarts = self.mqtt.ha_restarts
-
-            for key in self.new_data:
-                await self.__async_publ_mqtt_packet(key)
-            for key in Infos.new_stat_data:
-                await self._async_publ_mqtt_proxy_stat(key)
-
-        except MqttCodeError as error:
-            logging.error(f'Mqtt except: {error}')
-        except Exception:
-            self.inc_counter('SW_Exception')
-            logging.error(
-                f"Inverter: Exception:\n"
-                f"{traceback.format_exc()}")
-
-    async def __async_publ_mqtt_packet(self, key):
-        db = self.db.db
-        if key in db and self.new_data[key]:
-            data_json = json.dumps(db[key])
-            node_id = self.node_id
-            logger_mqtt.debug(f'{key}: {data_json}')
-            await self.mqtt.publish(f'{self.entity_prfx}{node_id}{key}', data_json)  # noqa: E501
-            self.new_data[key] = False
-
-    async def __register_home_assistant(self) -> None:
-        '''register all our topics at home assistant'''
-        for data_json, component, node_id, id in self.db.ha_confs(
-                self.entity_prfx, self.node_id, self.unique_id,
-                self.sug_area):
-            logger_mqtt.debug(f"MQTT Register: cmp:'{component}'"
-                              f" node_id:'{node_id}' {data_json}")
-            await self.mqtt.publish(f"{self.discovery_prfx}{component}"
-                                    f"/{node_id}{id}/config", data_json)
-
-        self.db.reg_clr_at_midnight(f'{self.entity_prfx}{self.node_id}')
-
-    def close(self) -> None:
-        logging.debug(f'InverterG3.close() l{self.l_addr} | r{self.r_addr}')
-        super().close()         # call close handler in the parent class
-#         logging.info(f'Inverter refs: {gc.get_referrers(self)}')
-
-    def __del__(self):
-        logging.debug("InverterG3.__del__")
-        super().__del__()
+class InverterG3(InverterBase):
+    def __init__(self, reader: StreamReader, writer: StreamWriter):
+        super().__init__(reader, writer, 'tsun', Talent)
--- a/app/src/gen3/talent.py
+++ b/app/src/gen3/talent.py
@@ -5,16 +5,16 @@ from datetime import datetime
 from tzlocal import get_localzone

 if __name__ == "app.src.gen3.talent":
-    from app.src.messages import hex_dump_memory, Message, State
+    from app.src.async_ifc import AsyncIfc
+    from app.src.messages import Message, State
    from app.src.modbus import Modbus
-    from app.src.my_timer import Timer
    from app.src.config import Config
    from app.src.gen3.infos_g3 import InfosG3
    from app.src.infos import Register
 else:  # pragma: no cover
-    from messages import hex_dump_memory, Message, State
+    from async_ifc import AsyncIfc
+    from messages import Message, State
    from modbus import Modbus
-    from my_timer import Timer
    from config import Config
    from gen3.infos_g3 import InfosG3
    from infos import Register
@@ -40,12 +40,19 @@ class Control:


 class Talent(Message):
-    MB_START_TIMEOUT = 40
-    MB_REGULAR_TIMEOUT = 60
    TXT_UNKNOWN_CTRL = 'Unknown Ctrl'

-    def __init__(self, server_side: bool, id_str=b''):
-        super().__init__(server_side, self.send_modbus_cb, mb_timeout=15)
+    def __init__(self, addr, ifc: "AsyncIfc", server_side: bool,
+                 client_mode: bool = False, id_str=b''):
+        super().__init__('G3', ifc, server_side, self.send_modbus_cb,
+                         mb_timeout=15)
+        ifc.rx_set_cb(self.read)
+        ifc.prot_set_timeout_cb(self._timeout)
+        ifc.prot_set_init_new_client_conn_cb(self._init_new_client_conn)
+        ifc.prot_set_update_header_cb(self._update_header)
+
+        self.addr = addr
+        self.conn_no = ifc.get_conn_no()
        self.await_conn_resp_cnt = 0
        self.id_str = id_str
        self.contact_name = b''
@@ -56,7 +63,7 @@ class Talent(Message):
            0x00: self.msg_contact_info,
            0x13: self.msg_ota_update,
            0x22: self.msg_get_time,
-            0x99: self.msg_act_time,
+            0x99: self.msg_heartbeat,
            0x71: self.msg_collector_data,
            # 0x76:
            0x77: self.msg_modbus,
@@ -76,33 +83,17 @@ class Talent(Message):
            0x87: self.get_modbus_log_lvl,
            0x04: logging.INFO,
        }
-        self.modbus_elms = 0    # for unit tests
-        self.node_id = 'G3'     # will be overwritten in __set_serial_no
-        self.mb_timer = Timer(self.mb_timout_cb, self.node_id)
-        self.mb_timeout = self.MB_REGULAR_TIMEOUT
-        self.mb_first_timeout = self.MB_START_TIMEOUT
-        self.modbus_polling = False

    '''
    Our puplic methods
    '''
    def close(self) -> None:
        logging.debug('Talent.close()')
-        if self.server_side:
-            # set inverter state to offline, if output power is very low
-            logging.debug('close power: '
-                          f'{self.db.get_db_value(Register.OUTPUT_POWER, -1)}')
-            if self.db.get_db_value(Register.OUTPUT_POWER, 999) < 2:
-                self.db.set_db_def_value(Register.INVERTER_STATUS, 0)
-                self.new_data['env'] = True
-
        # we have references to methods of this class in self.switch
        # so we have to erase self.switch, otherwise this instance can't be
        # deallocated by the garbage collector ==> we get a memory leak
        self.switch.clear()
        self.log_lvl.clear()
-        self.state = State.closed
-        self.mb_timer.close()
        super().close()

    def __set_serial_no(self, serial_no: str):
@@ -120,6 +111,8 @@ class Talent(Message):
                self.modbus_polling = inv['modbus_polling']
                logger.debug(f'SerialNo {serial_no} allowed! area:{self.sug_area}')  # noqa: E501
                self.db.set_pv_module_details(inv)
+                if self.mb:
+                    self.mb.set_node_id(self.node_id)
            else:
                self.node_id = ''
                self.sug_area = ''
@@ -138,10 +131,10 @@ class Talent(Message):
        self._read()
        while True:
            if not self.header_valid:
-                self.__parse_header(self._recv_buffer, len(self._recv_buffer))
+                self.__parse_header(self.ifc.rx_peek(), self.ifc.rx_len())

            if self.header_valid and \
-               len(self._recv_buffer) >= (self.header_len + self.data_len):
+               self.ifc.rx_len() >= (self.header_len + self.data_len):
                if self.state == State.init:
                    self.state = State.received     # received 1st package

@@ -149,11 +142,10 @@ class Talent(Message):
                if callable(log_lvl):
                    log_lvl = log_lvl()

-                hex_dump_memory(log_lvl, f'Received from {self.addr}:'
-                                f' BufLen: {len(self._recv_buffer)}'
+                self.ifc.rx_log(log_lvl, f'Received from {self.addr}:'
+                                f' BufLen: {self.ifc.rx_len()}'
                                f' HdrLen: {self.header_len}'
-                                f' DtaLen: {self.data_len}',
-                                self._recv_buffer, len(self._recv_buffer))
+                                f' DtaLen: {self.data_len}')

                self.__set_serial_no(self.id_str.decode("utf-8"))
                self.__dispatch_msg()
@@ -165,35 +157,15 @@ class Talent(Message):
        '''add the actual receive msg to the forwarding queue'''
        tsun = Config.get('tsun')
        if tsun['enabled']:
-            buffer = self._recv_buffer
            buflen = self.header_len+self.data_len
-            self._forward_buffer += buffer[:buflen]
-            hex_dump_memory(logging.DEBUG, 'Store for forwarding:',
-                            buffer, buflen)
+            buffer = self.ifc.rx_peek(buflen)
+            self.ifc.fwd_add(buffer)
+            self.ifc.fwd_log(logging.DEBUG, 'Store for forwarding:')

            fnc = self.switch.get(self.msg_id, self.msg_unknown)
            logger.info(self.__flow_str(self.server_side, 'forwrd') +
                        f' Ctl: {int(self.ctrl):#02x} Msg: {fnc.__name__!r}')

-    def forward_snd(self) -> None:
-        '''add the actual receive msg to the forwarding queue'''
-        tsun = Config.get('tsun')
-        if tsun['enabled']:
-            _len = len(self._send_buffer) - self.send_msg_ofs
-            struct.pack_into('!l', self._send_buffer, self.send_msg_ofs,
-                             _len-4)
-
-            buffer = self._send_buffer[self.send_msg_ofs:]
-            buflen = _len
-            self._forward_buffer += buffer[:buflen]
-            hex_dump_memory(logging.INFO, 'Store for forwarding:',
-                            buffer, buflen)
-
-            fnc = self.switch.get(self.msg_id, self.msg_unknown)
-            logger.info(self.__flow_str(self.server_side, 'forwrd') +
-                        f' Ctl: {int(self.ctrl):#02x} Msg: {fnc.__name__!r}')
-        self._send_buffer = self._send_buffer[:self.send_msg_ofs]
-
    def send_modbus_cb(self, modbus_pdu: bytearray, log_lvl: int, state: str):
        if self.state != State.up:
            logger.warning(f'[{self.node_id}] ignore MODBUS cmd,'
@@ -201,34 +173,24 @@ class Talent(Message):
            return

        self.__build_header(0x70, 0x77)
-        self._send_buffer += b'\x00\x01\xa3\x28'   # magic ?
-        self._send_buffer += struct.pack('!B', len(modbus_pdu))
-        self._send_buffer += modbus_pdu
+        self.ifc.tx_add(b'\x00\x01\xa3\x28')   # magic ?
+        self.ifc.tx_add(struct.pack('!B', len(modbus_pdu)))
+        self.ifc.tx_add(modbus_pdu)
        self.__finish_send_msg()

-        hex_dump_memory(log_lvl, f'Send Modbus {state}:{self.addr}:',
-                        self._send_buffer, len(self._send_buffer))
-        self.writer.write(self._send_buffer)
-        self._send_buffer = bytearray(0)  # self._send_buffer[sent:]
-
-    def _send_modbus_cmd(self, func, addr, val, log_lvl) -> None:
-        if self.state != State.up:
-            logger.log(log_lvl, f'[{self.node_id}] ignore MODBUS cmd,'
-                       ' as the state is not UP')
-            return
-        self.mb.build_msg(Modbus.INV_ADDR, func, addr, val, log_lvl)
-
-    async def send_modbus_cmd(self, func, addr, val, log_lvl) -> None:
-        self._send_modbus_cmd(func, addr, val, log_lvl)
+        self.ifc.tx_log(log_lvl, f'Send Modbus {state}:{self.addr}:')
+        self.ifc.tx_flush()

    def mb_timout_cb(self, exp_cnt):
        self.mb_timer.start(self.mb_timeout)

        if 2 == (exp_cnt % 30):
            # logging.info("Regular Modbus Status request")
-            self._send_modbus_cmd(Modbus.READ_REGS, 0x2000, 96, logging.DEBUG)
+            self._send_modbus_cmd(Modbus.INV_ADDR, Modbus.READ_REGS, 0x2000,
+                                  96, logging.DEBUG)
        else:
-            self._send_modbus_cmd(Modbus.READ_REGS, 0x3000, 48, logging.DEBUG)
+            self._send_modbus_cmd(Modbus.INV_ADDR, Modbus.READ_REGS, 0x3000,
+                                  48, logging.DEBUG)

    def _init_new_client_conn(self) -> bool:
        contact_name = self.contact_name
@@ -237,9 +199,9 @@ class Talent(Message):
        self.msg_id = 0
        self.await_conn_resp_cnt += 1
        self.__build_header(0x91)
-        self._send_buffer += struct.pack(f'!{len(contact_name)+1}p'
-                                         f'{len(contact_mail)+1}p',
-                                         contact_name, contact_mail)
+        self.ifc.tx_add(struct.pack(f'!{len(contact_name)+1}p'
+                                    f'{len(contact_mail)+1}p',
+                                    contact_name, contact_mail))

        self.__finish_send_msg()
        return True
@@ -323,7 +285,7 @@ class Talent(Message):
            self.inc_counter('Invalid_Msg_Format')

            # erase broken recv buffer
-            self._recv_buffer = bytearray()
+            self.ifc.rx_clear()
            return

        hdr_len = 5+id_len+2
@@ -344,16 +306,17 @@ class Talent(Message):
    def __build_header(self, ctrl, msg_id=None) -> None:
        if not msg_id:
            msg_id = self.msg_id
-        self.send_msg_ofs = len(self._send_buffer)
-        self._send_buffer += struct.pack(f'!l{len(self.id_str)+1}pBB',
-                                         0, self.id_str, ctrl, msg_id)
+        self.send_msg_ofs = self.ifc.tx_len()
+        self.ifc.tx_add(struct.pack(f'!l{len(self.id_str)+1}pBB',
+                                    0, self.id_str, ctrl, msg_id))
        fnc = self.switch.get(msg_id, self.msg_unknown)
        logger.info(self.__flow_str(self.server_side, 'tx') +
                    f' Ctl: {int(ctrl):#02x} Msg: {fnc.__name__!r}')

    def __finish_send_msg(self) -> None:
-        _len = len(self._send_buffer) - self.send_msg_ofs
-        struct.pack_into('!l', self._send_buffer, self.send_msg_ofs, _len-4)
+        _len = self.ifc.tx_len() - self.send_msg_ofs
+        struct.pack_into('!l', self.ifc.tx_peek(), self.send_msg_ofs,
+                         _len-4)

    def __dispatch_msg(self) -> None:
        fnc = self.switch.get(self.msg_id, self.msg_unknown)
@@ -367,7 +330,7 @@ class Talent(Message):
                        f' Ctl: {int(self.ctrl):#02x} Msg: {fnc.__name__!r}')

    def __flush_recv_msg(self) -> None:
-        self._recv_buffer = self._recv_buffer[(self.header_len+self.data_len):]
+        self.ifc.rx_get(self.header_len+self.data_len)
        self.header_valid = False

    '''
@@ -377,7 +340,7 @@ class Talent(Message):
        if self.ctrl.is_ind():
            if self.server_side and self.__process_contact_info():
                self.__build_header(0x91)
-                self._send_buffer += b'\x01'
+                self.ifc.tx_add(b'\x01')
                self.__finish_send_msg()
            # don't forward this contact info here, we will build one
            # when the remote connection is established
@@ -391,19 +354,21 @@ class Talent(Message):
            self.forward()

    def __process_contact_info(self) -> bool:
-        result = struct.unpack_from('!B', self._recv_buffer, self.header_len)
+        buf = self.ifc.rx_peek()
+        result = struct.unpack_from('!B', buf, self.header_len)
        name_len = result[0]
-        if self.data_len < name_len+2:
+        if self.data_len == 1:  # this is a response withone status byte
            return False
-        result = struct.unpack_from(f'!{name_len+1}pB', self._recv_buffer,
-                                    self.header_len)
-        self.contact_name = result[0]
-        mail_len = result[1]
-        logger.info(f'name: {self.contact_name}')
+        if self.data_len >= name_len+2:
+            result = struct.unpack_from(f'!{name_len+1}pB', buf,
+                                        self.header_len)
+            self.contact_name = result[0]
+            mail_len = result[1]
+            logger.info(f'name: {self.contact_name}')

-        result = struct.unpack_from(f'!{mail_len+1}p', self._recv_buffer,
-                                    self.header_len+name_len+1)
-        self.contact_mail = result[0]
+            result = struct.unpack_from(f'!{mail_len+1}p', buf,
+                                        self.header_len+name_len+1)
+            self.contact_mail = result[0]
        logger.info(f'mail: {self.contact_mail}')
        return True

@@ -416,16 +381,16 @@ class Talent(Message):
                ts = self._timestamp()
                logger.debug(f'time: {ts:08x}')
                self.__build_header(0x91)
-                self._send_buffer += struct.pack('!q', ts)
+                self.ifc.tx_add(struct.pack('!q', ts))
                self.__finish_send_msg()

            elif self.data_len >= 8:
                ts = self._timestamp()
-                result = struct.unpack_from('!q', self._recv_buffer,
+                result = struct.unpack_from('!q', self.ifc.rx_peek(),
                                            self.header_len)
                self.ts_offset = result[0]-ts
-                if self.remote_stream:
-                    self.remote_stream.ts_offset = self.ts_offset
+                if self.ifc.remote.stream:
+                    self.ifc.remote.stream.ts_offset = self.ts_offset
                logger.debug(f'tsun-time: {int(result[0]):08x}'
                             f'  proxy-time: {ts:08x}'
                             f'  offset: {self.ts_offset}')
@@ -436,7 +401,7 @@ class Talent(Message):

        self.forward()

-    def msg_act_time(self):
+    def msg_heartbeat(self):
        if self.ctrl.is_ind():
            if self.data_len == 9:
                self.state = State.up  # allow MODBUS cmds
@@ -445,25 +410,23 @@ class Talent(Message):
                    self.db.set_db_def_value(Register.POLLING_INTERVAL,
                                             self.mb_timeout)
                self.__build_header(0x99)
-                self._send_buffer += b'\x02'
+                self.ifc.tx_add(b'\x02')
                self.__finish_send_msg()

-                result = struct.unpack_from('!Bq', self._recv_buffer,
+                result = struct.unpack_from('!Bq', self.ifc.rx_peek(),
                                            self.header_len)
                resp_code = result[0]
                ts = result[1]+self.ts_offset
                logger.debug(f'inv-time: {int(result[1]):08x}'
                             f'  tsun-time: {ts:08x}'
                             f'  offset: {self.ts_offset}')
-                self.__build_header(0x91)
-                self._send_buffer += struct.pack('!Bq', resp_code, ts)
-                self.forward_snd()
-                return
+                struct.pack_into('!Bq', self.ifc.rx_peek(),
+                                 self.header_len, resp_code, ts)
        elif self.ctrl.is_resp():
-            result = struct.unpack_from('!B', self._recv_buffer,
+            result = struct.unpack_from('!B', self.ifc.rx_peek(),
                                        self.header_len)
            resp_code = result[0]
-            logging.debug(f'TimeActRespCode: {resp_code}')
+            logging.debug(f'Heartbeat-RespCode: {resp_code}')
            return
        else:
            logger.warning(self.TXT_UNKNOWN_CTRL)
@@ -472,7 +435,8 @@ class Talent(Message):
        self.forward()

    def parse_msg_header(self):
-        result = struct.unpack_from('!lB', self._recv_buffer, self.header_len)
+        result = struct.unpack_from('!lB', self.ifc.rx_peek(),
+                                    self.header_len)

        data_id = result[0]    # len of complete message
        id_len = result[1]     # len of variable id string
@@ -480,7 +444,7 @@ class Talent(Message):

        msg_hdr_len = 5+id_len+9

-        result = struct.unpack_from(f'!{id_len+1}pBq', self._recv_buffer,
+        result = struct.unpack_from(f'!{id_len+1}pBq', self.ifc.rx_peek(),
                                    self.header_len + 4)

        timestamp = result[2]
@@ -493,7 +457,7 @@ class Talent(Message):
    def msg_collector_data(self):
        if self.ctrl.is_ind():
            self.__build_header(0x99)
-            self._send_buffer += b'\x01'
+            self.ifc.tx_add(b'\x01')
            self.__finish_send_msg()
            self.__process_data()

@@ -508,7 +472,7 @@ class Talent(Message):
    def msg_inverter_data(self):
        if self.ctrl.is_ind():
            self.__build_header(0x99)
-            self._send_buffer += b'\x01'
+            self.ifc.tx_add(b'\x01')
            self.__finish_send_msg()
            self.__process_data()
            self.state = State.up  # allow MODBUS cmds
@@ -528,7 +492,7 @@ class Talent(Message):
    def __process_data(self):
        msg_hdr_len, ts = self.parse_msg_header()

-        for key, update in self.db.parse(self._recv_buffer, self.header_len
+        for key, update in self.db.parse(self.ifc.rx_peek(), self.header_len
                                         + msg_hdr_len, self.node_id):
            if update:
                self._set_mqtt_timestamp(key, self._utcfromts(ts))
@@ -548,7 +512,7 @@ class Talent(Message):

        msg_hdr_len = 5

-        result = struct.unpack_from('!lBB', self._recv_buffer,
+        result = struct.unpack_from('!lBB', self.ifc.rx_peek(),
                                    self.header_len)
        modbus_len = result[1]
        return msg_hdr_len, modbus_len
@@ -557,7 +521,7 @@ class Talent(Message):

        msg_hdr_len = 6

-        result = struct.unpack_from('!lBBB', self._recv_buffer,
+        result = struct.unpack_from('!lBBB', self.ifc.rx_peek(),
                                    self.header_len)
        modbus_len = result[2]
        return msg_hdr_len, modbus_len
@@ -578,13 +542,12 @@ class Talent(Message):
        self.__msg_modbus(hdr_len)

    def __msg_modbus(self, hdr_len):
-        data = self._recv_buffer[self.header_len:
-                                 self.header_len+self.data_len]
+        data = self.ifc.rx_peek()[self.header_len:
+                                  self.header_len+self.data_len]

        if self.ctrl.is_req():
-            if self.remote_stream.mb.recv_req(data[hdr_len:],
-                                              self.remote_stream.
-                                              msg_forward):
+            rstream = self.ifc.remote.stream
+            if rstream.mb.recv_req(data[hdr_len:], rstream.msg_forward):
                self.inc_counter('Modbus_Command')
            else:
                self.inc_counter('Invalid_Msg_Format')
@@ -597,8 +560,7 @@ class Talent(Message):
                return

            for key, update, _ in self.mb.recv_resp(self.db, data[
-                    hdr_len:],
-                    self.node_id):
+                    hdr_len:]):
                if update:
                    self._set_mqtt_timestamp(key, self._utc())
                    self.new_data[key] = True
--- a/app/src/gen3plus/connection_g3p.py
+++ b/app/src/gen3plus/connection_g3p.py
@@ -1,47 +0,0 @@
-import logging
-from asyncio import StreamReader, StreamWriter
-
-if __name__ == "app.src.gen3plus.connection_g3p":
-    from app.src.async_stream import AsyncStream
-    from app.src.gen3plus.solarman_v5 import SolarmanV5
-else:  # pragma: no cover
-    from async_stream import AsyncStream
-    from gen3plus.solarman_v5 import SolarmanV5
-
-logger = logging.getLogger('conn')
-
-
-class ConnectionG3P(AsyncStream, SolarmanV5):
-
-    def __init__(self, reader: StreamReader, writer: StreamWriter,
-                 addr, remote_stream: 'ConnectionG3P',
-                 server_side: bool,
-                 client_mode: bool) -> None:
-        AsyncStream.__init__(self, reader, writer, addr)
-        SolarmanV5.__init__(self, server_side, client_mode)
-
-        self.remote_stream: 'ConnectionG3P' = remote_stream
-
-    '''
-    Our puplic methods
-    '''
-    def close(self):
-        AsyncStream.close(self)
-        SolarmanV5.close(self)
-        #  logger.info(f'AsyncStream refs: {gc.get_referrers(self)}')
-
-    async def async_create_remote(self) -> None:
-        pass  # virtual interface # pragma: no cover
-
-    async def async_publ_mqtt(self) -> None:
-        pass  # virtual interface # pragma: no cover
-
-    def healthy(self) -> bool:
-        logger.debug('ConnectionG3P healthy()')
-        return AsyncStream.healthy(self)
-
-    '''
-    Our private methods
-    '''
-    def __del__(self):
-        super().__del__()
--- a/app/src/gen3plus/infos_g3p.py
+++ b/app/src/gen3plus/infos_g3p.py
@@ -1,38 +1,58 @@

-import struct
 from typing import Generator

 if __name__ == "app.src.gen3plus.infos_g3p":
-    from app.src.infos import Infos, Register, ProxyMode
+    from app.src.infos import Infos, Register, ProxyMode, Fmt
 else:  # pragma: no cover
-    from infos import Infos, Register, ProxyMode
+    from infos import Infos, Register, ProxyMode, Fmt


 class RegisterMap:
    # make the class read/only by using __slots__
-
    __slots__ = ()
+
+    FMT_2_16BIT_VAL = '!HH'
+    FMT_3_16BIT_VAL = '!HHH'
+    FMT_4_16BIT_VAL = '!HHHH'
+
    map = {
        # 0x41020007: {'reg': Register.DEVICE_SNR,           'fmt': '<L'},                 # noqa: E501
-        0x41020018: {'reg': Register.DATA_UP_INTERVAL,     'fmt': '<B', 'ratio':   60, 'dep': ProxyMode.SERVER},  # noqa: E501
-        0x41020019: {'reg': Register.COLLECT_INTERVAL,     'fmt': '<B', 'eval': 'round(result/60)', 'dep': ProxyMode.SERVER},  # noqa: E501
+        0x41020018: {'reg': Register.DATA_UP_INTERVAL,     'fmt': '<B', 'ratio':    60, 'dep': ProxyMode.SERVER},  # noqa: E501
+        0x41020019: {'reg': Register.COLLECT_INTERVAL,     'fmt': '<B', 'quotient': 60, 'dep': ProxyMode.SERVER},  # noqa: E501
        0x4102001a: {'reg': Register.HEARTBEAT_INTERVAL,   'fmt': '<B', 'ratio':    1},  # noqa: E501
+        0x4102001b: {'reg': None,                          'fmt': '<B', 'const':    1},  # noqa: E501 Max No Of Connected Devices
        0x4102001c: {'reg': Register.SIGNAL_STRENGTH,      'fmt': '<B', 'ratio':    1, 'dep': ProxyMode.SERVER},  # noqa: E501
+        0x4102001d: {'reg': None,                          'fmt': '<B', 'const':    1},  # noqa: E501
        0x4102001e: {'reg': Register.CHIP_MODEL,           'fmt': '!40s'},               # noqa: E501
+        0x41020046: {'reg': Register.MAC_ADDR,             'fmt': '!6B', 'func': Fmt.mac},  # noqa: E501
        0x4102004c: {'reg': Register.IP_ADDRESS,           'fmt': '!16s'},               # noqa: E501
-        0x4102005f: {'reg': Register.SENSOR_LIST,          'fmt': '<H', 'eval': "f'{result:04x}'"},                 # noqa: E501
+        0x4102005c: {'reg': None,                          'fmt': '<B', 'const':   15},  # noqa: E501
+        0x4102005e: {'reg': None,                          'fmt': '<B', 'const':    1},  # noqa: E501 No Of Sensors (ListLen)
+        0x4102005f: {'reg': Register.SENSOR_LIST,          'fmt': '<H', 'func': Fmt.hex4},   # noqa: E501
+        0x41020061: {'reg': None,                          'fmt': '<BBB', 'const':  (15, 0, 255)},  # noqa: E501
        0x41020064: {'reg': Register.COLLECTOR_FW_VERSION, 'fmt': '!40s'},               # noqa: E501
+        0x4102008c: {'reg': None,                          'fmt': '<BB', 'const':    (254, 254)},  # noqa: E501
+        0x410200b7: {'reg': Register.SSID,                 'fmt': '!40s'},               # noqa: E501

-        0x4201000c: {'reg': Register.SENSOR_LIST,          'fmt': '<H', 'eval': "f'{result:04x}'"},                 # noqa: E501
+        0x4201000c: {'reg': Register.SENSOR_LIST,          'fmt': '<H', 'func': Fmt.hex4},   # noqa: E501
        0x4201001c: {'reg': Register.POWER_ON_TIME,        'fmt': '<H', 'ratio':    1, 'dep': ProxyMode.SERVER},  # noqa: E501, or packet number
        0x42010020: {'reg': Register.SERIAL_NUMBER,        'fmt': '!16s'},               # noqa: E501
+
+        # Start MODBUS Block: 0x3000 (R/O Measurements)
        0x420100c0: {'reg': Register.INVERTER_STATUS,      'fmt': '!H'},                 # noqa: E501
-        0x420100d0: {'reg': Register.VERSION,              'fmt': '!H', 'eval': "f'V{(result>>12)}.{(result>>8)&0xf}.{(result>>4)&0xf}{result&0xf}'"},  # noqa: E501
+        0x420100c2: {'reg': Register.DETECT_STATUS_1,      'fmt': '!H'},                 # noqa: E501
+        0x420100c4: {'reg': Register.DETECT_STATUS_2,      'fmt': '!H'},                 # noqa: E501
+        0x420100c6: {'reg': Register.EVENT_ALARM,          'fmt': '!H'},                 # noqa: E501
+        0x420100c8: {'reg': Register.EVENT_FAULT,          'fmt': '!H'},                 # noqa: E501
+        0x420100ca: {'reg': Register.EVENT_BF1,            'fmt': '!H'},                 # noqa: E501
+        0x420100cc: {'reg': Register.EVENT_BF2,            'fmt': '!H'},                 # noqa: E501
+        # 0x420100ce
+        0x420100d0: {'reg': Register.VERSION,              'fmt': '!H', 'func': Fmt.version},  # noqa: E501
        0x420100d2: {'reg': Register.GRID_VOLTAGE,         'fmt': '!H', 'ratio':  0.1},  # noqa: E501
        0x420100d4: {'reg': Register.GRID_CURRENT,         'fmt': '!H', 'ratio': 0.01},  # noqa: E501
        0x420100d6: {'reg': Register.GRID_FREQUENCY,       'fmt': '!H', 'ratio': 0.01},  # noqa: E501
-        0x420100d8: {'reg': Register.INVERTER_TEMP,        'fmt': '!H', 'eval': 'result-40'},  # noqa: E501
-        # 0x420100d8: {'reg': Register.INVERTER_TEMP,        'fmt': '!H'},                 # noqa: E501
+        0x420100d8: {'reg': Register.INVERTER_TEMP,        'fmt': '!H', 'offset': -40},  # noqa: E501
+        # 0x420100da
        0x420100dc: {'reg': Register.RATED_POWER,          'fmt': '!H', 'ratio':    1},  # noqa: E501
        0x420100de: {'reg': Register.OUTPUT_POWER,         'fmt': '!H', 'ratio':  0.1},  # noqa: E501
        0x420100e0: {'reg': Register.PV1_VOLTAGE,          'fmt': '!H', 'ratio':  0.1},  # noqa: E501
@@ -57,16 +77,44 @@ class RegisterMap:
        0x4201010c: {'reg': Register.PV3_TOTAL_GENERATION, 'fmt': '!L', 'ratio': 0.01},  # noqa: E501
        0x42010110: {'reg': Register.PV4_DAILY_GENERATION, 'fmt': '!H', 'ratio': 0.01},  # noqa: E501
        0x42010112: {'reg': Register.PV4_TOTAL_GENERATION, 'fmt': '!L', 'ratio': 0.01},  # noqa: E501
-        0x42010126: {'reg': Register.MAX_DESIGNED_POWER,   'fmt': '!H', 'ratio':    1},  # noqa: E501
+        0x42010116: {'reg': Register.INV_UNKNOWN_1,        'fmt': '!H'},                 # noqa: E501
+
+        # Start MODBUS Block: 0x2000 (R/W Config Paramaneters)
+        0x42010118: {'reg': Register.BOOT_STATUS,          'fmt': '!H'},
+        0x4201011a: {'reg': Register.DSP_STATUS,           'fmt': '!H'},
+        0x4201011c: {'reg': None,                          'fmt': '!H', 'const':    1},  # noqa: E501
+        0x4201011e: {'reg': Register.WORK_MODE,            'fmt': '!H'},
+        0x42010124: {'reg': Register.OUTPUT_SHUTDOWN,      'fmt': '!H'},
+        0x42010126: {'reg': Register.MAX_DESIGNED_POWER,   'fmt': '!H'},
+        0x42010128: {'reg': Register.RATED_LEVEL,          'fmt': '!H'},
+        0x4201012a: {'reg': Register.INPUT_COEFFICIENT,    'fmt': '!H', 'ratio':  100/1024},  # noqa: E501
+        0x4201012c: {'reg': Register.GRID_VOLT_CAL_COEF,   'fmt': '!H'},
+        0x4201012e: {'reg': None,                          'fmt': '!H', 'const':   1024},  # noqa: E501
+        0x42010130: {'reg': None,                          'fmt': FMT_4_16BIT_VAL, 'const': (1024, 1, 0xffff, 1)},  # noqa: E501
+        0x42010138: {'reg': None,                          'fmt': FMT_4_16BIT_VAL, 'const': (6, 0x68, 0x68, 0x500)},  # noqa: E501
+        0x42010140: {'reg': None,                          'fmt': FMT_4_16BIT_VAL, 'const': (0x9cd, 0x7b6, 0x139c, 0x1324)},  # noqa: E501
+        0x42010148: {'reg': None,                          'fmt': FMT_4_16BIT_VAL, 'const': (1, 0x7ae, 0x40f, 0x41)},  # noqa: E501
+        0x42010150: {'reg': None,                          'fmt': FMT_4_16BIT_VAL, 'const': (0xf, 0xa64, 0xa64, 0x6)},  # noqa: E501
+        0x42010158: {'reg': None,                          'fmt': FMT_4_16BIT_VAL, 'const': (0x6, 0x9f6, 0x128c, 0x128c)},  # noqa: E501
+        0x42010160: {'reg': None,                          'fmt': FMT_4_16BIT_VAL, 'const': (0x10, 0x10, 0x1452, 0x1452)},  # noqa: E501
+        0x42010168: {'reg': None,                          'fmt': FMT_4_16BIT_VAL, 'const': (0x10, 0x10, 0x151, 0x5)},  # noqa: E501
+        0x42010170: {'reg': Register.OUTPUT_COEFFICIENT,   'fmt': '!H', 'ratio':  100/1024},  # noqa: E501
+        0x42010172: {'reg': None,                          'fmt': FMT_3_16BIT_VAL, 'const':  (0x1, 0x139c, 0xfa0)},  # noqa: E501
+        0x42010178: {'reg': None,                          'fmt': FMT_4_16BIT_VAL, 'const': (0x4e, 0x66, 0x3e8, 0x400)},  # noqa: E501
+        0x42010180: {'reg': None,                          'fmt': FMT_4_16BIT_VAL, 'const': (0x9ce, 0x7a8, 0x139c, 0x1326)},  # noqa: E501
+        0x42010188: {'reg': None,                          'fmt': FMT_4_16BIT_VAL, 'const': (0x0, 0x0, 0x0, 0)},  # noqa: E501
+        0x42010190: {'reg': None,                          'fmt': FMT_4_16BIT_VAL, 'const': (0x0, 0x0, 1024, 1024)},  # noqa: E501
+        0x42010198: {'reg': None,                          'fmt': FMT_4_16BIT_VAL, 'const': (0, 0, 0xffff, 0)},  # noqa: E501
+        0x420101a0: {'reg': None,                          'fmt': FMT_2_16BIT_VAL, 'const': (0x0, 0x0)},  # noqa: E501

-        0xffffff01: {'reg': Register.OUTPUT_COEFFICIENT},
        0xffffff02: {'reg': Register.POLLING_INTERVAL},
        # 0x4281001c: {'reg': Register.POWER_ON_TIME,        'fmt': '<H', 'ratio':    1},  # noqa: E501
-
    }


 class InfosG3P(Infos):
+    __slots__ = ('client_mode', )
+
    def __init__(self, client_mode: bool):
        super().__init__()
        self.client_mode = client_mode
@@ -120,7 +168,7 @@ class InfosG3P(Infos):
            if not isinstance(row, dict):
                continue
            info_id = row['reg']
-            result = self.__get_value(buf, addr, row)
+            result = Fmt.get_value(buf, addr, row)

            keys, level, unit, must_incr = self._key_obj(info_id)

@@ -135,15 +183,22 @@ class InfosG3P(Infos):
                self.tracer.log(level, f'[{node_id}] GEN3PLUS: {name}'
                                       f' : {result}{unit}')

-    def __get_value(self, buf, idx, row):
-        '''Get a value from buf and interpret as in row'''
-        fmt = row['fmt']
-        res = struct.unpack_from(fmt, buf, idx)
-        result = res[0]
-        if isinstance(result, (bytearray, bytes)):
-            result = result.decode().split('\x00')[0]
-        if 'eval' in row:
-            result = eval(row['eval'])
-        if 'ratio' in row:
-            result = round(result * row['ratio'], 2)
-        return result
+    def build(self, len, msg_type: int, rcv_ftype: int):
+        buf = bytearray(len)
+        for idx, row in RegisterMap.map.items():
+            addr = idx & 0xffff
+            ftype = (idx >> 16) & 0xff
+            mtype = (idx >> 24) & 0xff
+            if ftype != rcv_ftype or mtype != msg_type:
+                continue
+            if not isinstance(row, dict):
+                continue
+            if 'const' in row:
+                val = row['const']
+            else:
+                info_id = row['reg']
+                val = self.get_db_value(info_id)
+            if not val:
+                continue
+            Fmt.set_value(buf, addr, row, val)
+        return buf
--- a/app/src/gen3plus/inverter_g3p.py
+++ b/app/src/gen3plus/inverter_g3p.py
@@ -1,140 +1,20 @@
-import logging
-import traceback
-import json
-import asyncio
 from asyncio import StreamReader, StreamWriter
-from aiomqtt import MqttCodeError

 if __name__ == "app.src.gen3plus.inverter_g3p":
-    from app.src.config import Config
-    from app.src.inverter import Inverter
-    from app.src.gen3plus.connection_g3p import ConnectionG3P
-    from app.src.infos import Infos
+    from app.src.inverter_base import InverterBase
+    from app.src.gen3plus.solarman_v5 import SolarmanV5
+    from app.src.gen3plus.solarman_emu import SolarmanEmu
 else:  # pragma: no cover
-    from config import Config
-    from inverter import Inverter
-    from gen3plus.connection_g3p import ConnectionG3P
-    from infos import Infos
+    from inverter_base import InverterBase
+    from gen3plus.solarman_v5 import SolarmanV5
+    from gen3plus.solarman_emu import SolarmanEmu


-logger_mqtt = logging.getLogger('mqtt')
-
-
-class InverterG3P(Inverter, ConnectionG3P):
-    '''class Inverter is a derivation of an Async_Stream
-
-    The class has some class method for managing common resources like a
-    connection to the MQTT broker or proxy error counter which are common
-    for all inverter connection
-
-    Instances of the class are connections to an inverter and can have an
-    optional link to an remote connection to the TSUN cloud. A remote
-    connection dies with the inverter connection.
-
-    class methods:
-        class_init():  initialize the common resources of the proxy (MQTT
-                       broker, Proxy DB, etc). Must be called before the
-                       first inverter instance can be created
-        class_close(): release the common resources of the proxy. Should not
-                       be called before any instances of the class are
-                       destroyed
-
-    methods:
-        server_loop(addr): Async loop method for receiving messages from the
-                           inverter (server-side)
-        client_loop(addr): Async loop method for receiving messages from the
-                           TSUN cloud (client-side)
-        async_create_remote(): Establish a client connection to the TSUN cloud
-        async_publ_mqtt(): Publish data to MQTT broker
-        close(): Release method which must be called before a instance can be
-                 destroyed
-    '''
-
-    def __init__(self, reader: StreamReader, writer: StreamWriter, addr,
+class InverterG3P(InverterBase):
+    def __init__(self, reader: StreamReader, writer: StreamWriter,
                 client_mode: bool = False):
-        super().__init__(reader, writer, addr, None,
-                         server_side=True, client_mode=client_mode)
-        self.__ha_restarts = -1
-
-    async def async_create_remote(self) -> None:
-        '''Establish a client connection to the TSUN cloud'''
-        tsun = Config.get('solarman')
-        host = tsun['host']
-        port = tsun['port']
-        addr = (host, port)
-
-        try:
-            logging.info(f'[{self.node_id}] Connect to {addr}')
-            connect = asyncio.open_connection(host, port)
-            reader, writer = await connect
-            self.remote_stream = ConnectionG3P(reader, writer, addr, self,
-                                               server_side=False,
-                                               client_mode=False)
-            logging.info(f'[{self.remote_stream.node_id}:'
-                         f'{self.remote_stream.conn_no}] '
-                         f'Connected to {addr}')
-            asyncio.create_task(self.client_loop(addr))
-
-        except (ConnectionRefusedError, TimeoutError) as error:
-            logging.info(f'{error}')
-        except Exception:
-            self.inc_counter('SW_Exception')
-            logging.error(
-                f"Inverter: Exception for {addr}:\n"
-                f"{traceback.format_exc()}")
-
-    async def async_publ_mqtt(self) -> None:
-        '''publish data to MQTT broker'''
-        # check if new inverter or collector infos are available or when the
-        #  home assistant has changed the status back to online
-        try:
-            if (('inverter' in self.new_data and self.new_data['inverter'])
-                    or ('collector' in self.new_data and
-                        self.new_data['collector'])
-                    or self.mqtt.ha_restarts != self.__ha_restarts):
-                await self._register_proxy_stat_home_assistant()
-                await self.__register_home_assistant()
-                self.__ha_restarts = self.mqtt.ha_restarts
-
-            for key in self.new_data:
-                await self.__async_publ_mqtt_packet(key)
-            for key in Infos.new_stat_data:
-                await self._async_publ_mqtt_proxy_stat(key)
-
-        except MqttCodeError as error:
-            logging.error(f'Mqtt except: {error}')
-        except Exception:
-            self.inc_counter('SW_Exception')
-            logging.error(
-                f"Inverter: Exception:\n"
-                f"{traceback.format_exc()}")
-
-    async def __async_publ_mqtt_packet(self, key):
-        db = self.db.db
-        if key in db and self.new_data[key]:
-            data_json = json.dumps(db[key])
-            node_id = self.node_id
-            logger_mqtt.debug(f'{key}: {data_json}')
-            await self.mqtt.publish(f'{self.entity_prfx}{node_id}{key}', data_json)  # noqa: E501
-            self.new_data[key] = False
-
-    async def __register_home_assistant(self) -> None:
-        '''register all our topics at home assistant'''
-        for data_json, component, node_id, id in self.db.ha_confs(
-                self.entity_prfx, self.node_id, self.unique_id,
-                self.sug_area):
-            logger_mqtt.debug(f"MQTT Register: cmp:'{component}'"
-                              f" node_id:'{node_id}' {data_json}")
-            await self.mqtt.publish(f"{self.discovery_prfx}{component}"
-                                    f"/{node_id}{id}/config", data_json)
-
-        self.db.reg_clr_at_midnight(f'{self.entity_prfx}{self.node_id}')
-
-    def close(self) -> None:
-        logging.debug(f'InverterG3P.close() l{self.l_addr} | r{self.r_addr}')
-        super().close()         # call close handler in the parent class
-#        logger.debug (f'Inverter refs: {gc.get_referrers(self)}')
-
-    def __del__(self):
-        logging.debug("InverterG3P.__del__")
-        super().__del__()
+        remote_prot = None
+        if client_mode:
+            remote_prot = SolarmanEmu
+        super().__init__(reader, writer, 'solarman',
+                         SolarmanV5, client_mode, remote_prot)
--- a/app/src/gen3plus/solarman_emu.py
+++ b/app/src/gen3plus/solarman_emu.py
@@ -0,0 +1,144 @@
+import logging
+import struct
+
+if __name__ == "app.src.gen3plus.solarman_emu":
+    from app.src.async_ifc import AsyncIfc
+    from app.src.gen3plus.solarman_v5 import SolarmanBase
+    from app.src.my_timer import Timer
+    from app.src.infos import Register
+else:  # pragma: no cover
+    from async_ifc import AsyncIfc
+    from gen3plus.solarman_v5 import SolarmanBase
+    from my_timer import Timer
+    from infos import Register
+
+logger = logging.getLogger('msg')
+
+
+class SolarmanEmu(SolarmanBase):
+    def __init__(self, addr, ifc: "AsyncIfc",
+                 server_side: bool, client_mode: bool):
+        super().__init__(addr, ifc, server_side=False,
+                         _send_modbus_cb=None,
+                         mb_timeout=8)
+        logging.debug('SolarmanEmu.init()')
+        self.db = ifc.remote.stream.db
+        self.snr = ifc.remote.stream.snr
+        self.hb_timeout = 60
+        '''actual heatbeat timeout from the last response message'''
+        self.data_up_inv = self.db.get_db_value(Register.DATA_UP_INTERVAL)
+        '''time interval for getting new MQTT data messages'''
+        self.hb_timer = Timer(self.send_heartbeat_cb, self.node_id)
+        self.data_timer = Timer(self.send_data_cb, self.node_id)
+        self.last_sync = self._emu_timestamp()
+        '''timestamp when we send the last sync message (4110)'''
+        self.pkt_cnt = 0
+        '''last sent packet number'''
+
+        self.switch = {
+
+            0x4210: 'msg_data_ind',      # real time data
+            0x1210: self.msg_response,   # at least every 5 minutes
+
+            0x4710: 'msg_hbeat_ind',     # heatbeat
+            0x1710: self.msg_response,   # every 2 minutes
+
+            0x4110: 'msg_dev_ind',        # device data, sync start
+            0x1110: self.msg_response,    # every 3 hours
+
+        }
+
+        self.log_lvl = {
+
+            0x4110: logging.INFO,   # device data, sync start
+            0x1110: logging.INFO,   # every 3 hours
+
+            0x4210: logging.INFO,   # real time data
+            0x1210: logging.INFO,   # at least every 5 minutes
+
+            0x4710: logging.DEBUG,  # heatbeat
+            0x1710: logging.DEBUG,  # every 2 minutes
+
+        }
+
+    '''
+    Our puplic methods
+    '''
+    def close(self) -> None:
+        logging.info('SolarmanEmu.close()')
+        # we have references to methods of this class in self.switch
+        # so we have to erase self.switch, otherwise this instance can't be
+        # deallocated by the garbage collector ==> we get a memory leak
+        self.switch.clear()
+        self.log_lvl.clear()
+        self.hb_timer.close()
+        self.data_timer.close()
+        self.db = None
+        super().close()
+
+    def _set_serial_no(self, snr: int):
+        logging.debug(f'SolarmanEmu._set_serial_no, snr: {snr}')
+        self.unique_id = str(snr)
+
+    def _init_new_client_conn(self) -> bool:
+        logging.debug('SolarmanEmu.init_new()')
+        self.data_timer.start(self.data_up_inv)
+        return False
+
+    def next_pkt_cnt(self):
+        '''get the next packet number'''
+        self.pkt_cnt = (self.pkt_cnt + 1) & 0xffffffff
+        return self.pkt_cnt
+
+    def seconds_since_last_sync(self):
+        '''get seconds since last 0x4110 message was sent'''
+        return self._emu_timestamp() - self.last_sync
+
+    def send_heartbeat_cb(self, exp_cnt):
+        '''send a heartbeat to the TSUN cloud'''
+        self._build_header(0x4710)
+        self.ifc.tx_add(struct.pack('<B', 0))
+        self._finish_send_msg()
+        log_lvl = self.log_lvl.get(0x4710, logging.WARNING)
+        self.ifc.tx_log(log_lvl, 'Send heartbeat:')
+        self.ifc.tx_flush()
+
+    def send_data_cb(self, exp_cnt):
+        '''send a inverter data message to the TSUN cloud'''
+        self.hb_timer.start(self.hb_timeout)
+        self.data_timer.start(self.data_up_inv)
+        _len = 420
+        ftype = 1
+        build_msg = self.db.build(_len, 0x42, ftype)
+
+        self._build_header(0x4210)
+        self.ifc.tx_add(
+            struct.pack(
+                '<BHLLLHL', ftype, 0x02b0,
+                self._emu_timestamp(),
+                self.seconds_since_last_sync(),
+                self.time_ofs,
+                1,  # offset 0x1a
+                self.next_pkt_cnt()))
+        self.ifc.tx_add(build_msg[0x20:])
+        self._finish_send_msg()
+        log_lvl = self.log_lvl.get(0x4210, logging.WARNING)
+        self.ifc.tx_log(log_lvl, 'Send inv-data:')
+        self.ifc.tx_flush()
+
+    '''
+    Message handler methods
+    '''
+    def msg_response(self):
+        '''handle a received response from the TSUN cloud'''
+        logger.debug("EMU received rsp:")
+        _, _, ts, hb = super().msg_response()
+        logger.debug(f"EMU ts:{ts} hb:{hb}")
+        self.hb_timeout = hb
+        self.time_ofs = ts - self._emu_timestamp()
+        self.hb_timer.start(self.hb_timeout)
+
+    def msg_unknown(self):
+        '''counts a unknown or unexpected message from the TSUN cloud'''
+        logger.warning(f"EMU Unknow Msg: ID:{int(self.control):#04x}")
+        self.inc_counter('Unknown_Msg')
--- a/app/src/gen3plus/solarman_v5.py
+++ b/app/src/gen3plus/solarman_v5.py
@@ -5,19 +5,19 @@ import asyncio
 from datetime import datetime

 if __name__ == "app.src.gen3plus.solarman_v5":
+    from app.src.async_ifc import AsyncIfc
    from app.src.messages import hex_dump_memory, Message, State
    from app.src.modbus import Modbus
-    from app.src.my_timer import Timer
    from app.src.config import Config
    from app.src.gen3plus.infos_g3p import InfosG3P
-    from app.src.infos import Register
+    from app.src.infos import Register, Fmt
 else:  # pragma: no cover
+    from async_ifc import AsyncIfc
    from messages import hex_dump_memory, Message, State
    from config import Config
    from modbus import Modbus
-    from my_timer import Timer
    from gen3plus.infos_g3p import InfosG3P
-    from infos import Register
+    from infos import Register, Fmt

 logger = logging.getLogger('msg')

@@ -48,30 +48,228 @@ class Sequence():
        return f'{self.rcv_idx:02x}:{self.snd_idx:02x}'


-class SolarmanV5(Message):
-    AT_CMD = 1
-    MB_RTU_CMD = 2
-    MB_START_TIMEOUT = 40
-    '''start delay for Modbus polling in server mode'''
-    MB_REGULAR_TIMEOUT = 60
-    '''regular Modbus polling time in server mode'''
-    MB_CLIENT_DATA_UP = 30
-    '''Data up time in client mode'''
-    HDR_FMT = '<BLLL'
-    '''format string for packing of the header'''
-
-    def __init__(self, server_side: bool, client_mode: bool):
-        super().__init__(server_side, self.send_modbus_cb, mb_timeout=8)
-
+class SolarmanBase(Message):
+    def __init__(self, addr, ifc: "AsyncIfc", server_side: bool,
+                 _send_modbus_cb, mb_timeout: int):
+        super().__init__('G3P', ifc, server_side, _send_modbus_cb,
+                         mb_timeout)
+        ifc.rx_set_cb(self.read)
+        ifc.prot_set_timeout_cb(self._timeout)
+        ifc.prot_set_init_new_client_conn_cb(self._init_new_client_conn)
+        ifc.prot_set_update_header_cb(self.__update_header)
+        self.addr = addr
+        self.conn_no = ifc.get_conn_no()
        self.header_len = 11  # overwrite construcor in class Message
        self.control = 0
        self.seq = Sequence(server_side)
        self.snr = 0
-        self.db = InfosG3P(client_mode)
        self.time_ofs = 0
+
+    def read(self) -> float:
+        '''process all received messages in the _recv_buffer'''
+        self._read()
+        while True:
+            if not self.header_valid:
+                self.__parse_header(self.ifc.rx_peek(),
+                                    self.ifc.rx_len())
+
+            if self.header_valid and self.ifc.rx_len() >= \
+               (self.header_len + self.data_len+2):
+                self.__process_complete_received_msg()
+                self.__flush_recv_msg()
+            else:
+                return 0  # wait 0s before sending a response
+    '''
+    Our public methods
+    '''
+    def _flow_str(self, server_side: bool, type: str):  # noqa: F821
+        switch = {
+            'rx':      '  <',
+            'tx':      '  >',
+            'forwrd':  '<< ',
+            'drop':    ' xx',
+            'rxS':     '>  ',
+            'txS':     '<  ',
+            'forwrdS': ' >>',
+            'dropS':   'xx ',
+        }
+        if server_side:
+            type += 'S'
+        return switch.get(type, '???')
+
+    def get_fnc_handler(self, ctrl):
+        fnc = self.switch.get(ctrl, self.msg_unknown)
+        if callable(fnc):
+            return fnc, repr(fnc.__name__)
+        else:
+            return self.msg_unknown, repr(fnc)
+
+    def _build_header(self, ctrl) -> None:
+        '''build header for new transmit message'''
+        self.send_msg_ofs = self.ifc.tx_len()
+
+        self.ifc.tx_add(struct.pack(
+            '<BHHHL', 0xA5, 0, ctrl, self.seq.get_send(), self.snr))
+        _fnc, _str = self.get_fnc_handler(ctrl)
+        logger.info(self._flow_str(self.server_side, 'tx') +
+                    f' Ctl: {int(ctrl):#04x} Msg: {_str}')
+
+    def _finish_send_msg(self) -> None:
+        '''finish the transmit message, set lenght and checksum'''
+        _len = self.ifc.tx_len() - self.send_msg_ofs
+        struct.pack_into('<H', self.ifc.tx_peek(), self.send_msg_ofs+1,
+                         _len-11)
+        check = sum(self.ifc.tx_peek()[
+            self.send_msg_ofs+1:self.send_msg_ofs + _len]) & 0xff
+        self.ifc.tx_add(struct.pack('<BB', check, 0x15))    # crc & stop
+
+    def _timestamp(self):
+        # utc as epoche
+        return int(time.time())    # pragma: no cover
+
+    def _emu_timestamp(self):
+        '''timestamp for an emulated inverter (realtime - 1 day)'''
+        one_day = 24*60*60
+        return self._timestamp()-one_day
+
+    '''
+    Our private methods
+    '''
+    def __update_header(self, _forward_buffer):
+        '''update header for message before forwarding,
+        set sequence and checksum'''
+        _len = len(_forward_buffer)
+        ofs = 0
+        while ofs < _len:
+            result = struct.unpack_from('<BH', _forward_buffer, ofs)
+            data_len = result[1]    # len of variable id string
+
+            struct.pack_into('<H', _forward_buffer, ofs+5,
+                             self.seq.get_send())
+
+            check = sum(_forward_buffer[ofs+1:ofs+data_len+11]) & 0xff
+            struct.pack_into('<B', _forward_buffer, ofs+data_len+11, check)
+            ofs += (13 + data_len)
+
+    def __process_complete_received_msg(self):
+        log_lvl = self.log_lvl.get(self.control, logging.WARNING)
+        if callable(log_lvl):
+            log_lvl = log_lvl()
+        self.ifc.rx_log(log_lvl, f'Received from {self.addr}:')
+        # self._recv_buffer, self.header_len +
+        # self.data_len+2)
+        if self.__trailer_is_ok(self.ifc.rx_peek(), self.header_len
+                                + self.data_len + 2):
+            if self.state == State.init:
+                self.state = State.received
+            self._set_serial_no(self.snr)
+            self.__dispatch_msg()
+
+    def __parse_header(self, buf: bytes, buf_len: int) -> None:
+
+        if (buf_len < self.header_len):  # enough bytes for complete header?
+            return
+
+        result = struct.unpack_from('<BHHHL', buf, 0)
+
+        # store parsed header values in the class
+        start = result[0]            # start byte
+        self.data_len = result[1]    # len of variable id string
+        self.control = result[2]
+        self.seq.set_recv(result[3])
+        self.snr = result[4]
+
+        if start != 0xA5:
+            hex_dump_memory(logging.ERROR,
+                            'Drop packet w invalid start byte from'
+                            f' {self.addr}:', buf, buf_len)
+
+            self.inc_counter('Invalid_Msg_Format')
+            # erase broken recv buffer
+            self.ifc.rx_clear()
+            return
+        self.header_valid = True
+
+    def __trailer_is_ok(self, buf: bytes, buf_len: int) -> bool:
+        crc = buf[self.data_len+11]
+        stop = buf[self.data_len+12]
+        if stop != 0x15:
+            hex_dump_memory(logging.ERROR,
+                            'Drop packet w invalid stop byte from '
+                            f'{self.addr}:', buf, buf_len)
+            self.inc_counter('Invalid_Msg_Format')
+            if self.ifc.rx_len() > (self.data_len+13):
+                next_start = buf[self.data_len+13]
+                if next_start != 0xa5:
+                    # erase broken recv buffer
+                    self.ifc.rx_clear()
+
+            return False
+
+        check = sum(buf[1:buf_len-2]) & 0xff
+        if check != crc:
+            self.inc_counter('Invalid_Msg_Format')
+            logger.debug(f'CRC {int(crc):#02x} {int(check):#08x}'
+                         f' Stop:{int(stop):#02x}')
+            # start & stop byte are valid, discard only this message
+            return False
+
+        return True
+
+    def __flush_recv_msg(self) -> None:
+        self.ifc.rx_get(self.header_len + self.data_len+2)
+        self.header_valid = False
+
+    def __dispatch_msg(self) -> None:
+        _fnc, _str = self.get_fnc_handler(self.control)
+        if self.unique_id:
+            logger.info(self._flow_str(self.server_side, 'rx') +
+                        f' Ctl: {int(self.control):#04x}' +
+                        f' Msg: {_str}')
+            _fnc()
+        else:
+            logger.info(self._flow_str(self.server_side, 'drop') +
+                        f' Ctl: {int(self.control):#04x}' +
+                        f' Msg: {_str}')
+
+    '''
+    Message handler methods
+    '''
+    def msg_response(self):
+        data = self.ifc.rx_peek()[self.header_len:]
+        result = struct.unpack_from('<BBLL', data, 0)
+        ftype = result[0]  # always 2
+        valid = result[1] == 1  # status
+        ts = result[2]
+        set_hb = result[3]  # always 60 or 120
+        logger.debug(f'ftype:{ftype} accepted:{valid}'
+                     f' ts:{ts:08x}  nextHeartbeat: {set_hb}s')
+
+        dt = datetime.fromtimestamp(ts)
+        logger.debug(f'ts: {dt.strftime("%Y-%m-%d %H:%M:%S")}')
+        return ftype, valid, ts, set_hb
+
+
+class SolarmanV5(SolarmanBase):
+    AT_CMD = 1
+    MB_RTU_CMD = 2
+    '''regular Modbus polling time in server mode'''
+    MB_CLIENT_DATA_UP = 10
+    '''Data up time in client mode'''
+    HDR_FMT = '<BLLL'
+    '''format string for packing of the header'''
+
+    def __init__(self, addr, ifc: "AsyncIfc",
+                 server_side: bool, client_mode: bool):
+        super().__init__(addr, ifc, server_side, self.send_modbus_cb,
+                         mb_timeout=8)
+
+        self.db = InfosG3P(client_mode)
        self.forward_at_cmd_resp = False
        self.no_forwarding = False
        '''not allowed to connect to TSUN cloud by connection type'''
+        self.establish_inv_emu = False
+        '''create an Solarman EMU instance to send data to the TSUN cloud'''
        self.switch = {

            0x4210: self.msg_data_ind,   # real time data
@@ -126,57 +324,68 @@ class SolarmanV5(Message):
            0x4510: logging.INFO,  # from server
            0x1510: self.get_cmd_rsp_log_lvl,
        }
-        self.modbus_elms = 0    # for unit tests
        g3p_cnf = Config.get('gen3plus')

        if 'at_acl' in g3p_cnf:  # pragma: no cover
            self.at_acl = g3p_cnf['at_acl']

-        self.node_id = 'G3P'  # will be overwritten in __set_serial_no
-        self.mb_timer = Timer(self.mb_timout_cb, self.node_id)
-        self.mb_timeout = self.MB_REGULAR_TIMEOUT
-        self.mb_first_timeout = self.MB_START_TIMEOUT
-        '''timer value for next Modbus polling request'''
-        self.modbus_polling = False
        self.sensor_list = 0x0000
+        self.mb_start_reg = 0x0001    # 0x7001
+        self.mb_incr_reg = 0x100      # 4
+        self.mb_inv_no = 144           # 3
+        self.mb_scan_len = 4

    '''
    Our puplic methods
    '''
    def close(self) -> None:
        logging.debug('Solarman.close()')
-        if self.server_side:
-            # set inverter state to offline, if output power is very low
-            logging.debug('close power: '
-                          f'{self.db.get_db_value(Register.OUTPUT_POWER, -1)}')
-            if self.db.get_db_value(Register.OUTPUT_POWER, 999) < 2:
-                self.db.set_db_def_value(Register.INVERTER_STATUS, 0)
-                self.new_data['env'] = True
-
        # we have references to methods of this class in self.switch
        # so we have to erase self.switch, otherwise this instance can't be
        # deallocated by the garbage collector ==> we get a memory leak
        self.switch.clear()
        self.log_lvl.clear()
-        self.state = State.closed
-        self.mb_timer.close()
        super().close()

    async def send_start_cmd(self, snr: int, host: str,
+                             forward: bool,
                             start_timeout=MB_CLIENT_DATA_UP):
        self.no_forwarding = True
+        self.establish_inv_emu = forward
        self.snr = snr
-        self.__set_serial_no(snr)
+        self._set_serial_no(snr)
        self.mb_timeout = start_timeout
        self.db.set_db_def_value(Register.IP_ADDRESS, host)
        self.db.set_db_def_value(Register.POLLING_INTERVAL,
                                 self.mb_timeout)
+        self.db.set_db_def_value(Register.DATA_UP_INTERVAL,
+                                 300)
+        self.db.set_db_def_value(Register.COLLECT_INTERVAL,
+                                 1)
        self.db.set_db_def_value(Register.HEARTBEAT_INTERVAL,
                                 120)
+        self.db.set_db_def_value(Register.SENSOR_LIST,
+                                 Fmt.hex4((self.sensor_list, )))
        self.new_data['controller'] = True

        self.state = State.up
-        self._send_modbus_cmd(Modbus.READ_REGS, 0x3000, 48, logging.DEBUG)
+        # self.__build_header(0x1710)
+        # self.ifc.write += struct.pack('<B', 0)
+        # self.__finish_send_msg()
+        # hex_dump_memory(logging.INFO, f'Send StartCmd:{self.addr}:',
+        #                 self.ifc.write, len(self.ifc.write))
+        # self.writer.write(self.ifc.write)
+        # self.ifc.write = bytearray(0)  # self.ifc.write[sent:]
+
+        if self.sensor_list != 0x02b0:
+            self._send_modbus_cmd(self.mb_inv_no, Modbus.READ_REGS,
+                                  self.mb_start_reg, self.mb_scan_len,
+                                  logging.INFO)
+        else:
+            self.mb_inv_no = Modbus.INV_ADDR
+            self._send_modbus_cmd(self.mb_inv_no, Modbus.READ_REGS, 0x3000,
+                                  48, logging.DEBUG)
+
        self.mb_timer.start(self.mb_timeout)

    def new_state_up(self):
@@ -187,14 +396,25 @@ class SolarmanV5(Message):
                self.db.set_db_def_value(Register.POLLING_INTERVAL,
                                         self.mb_timeout)

+    def establish_emu(self):
+        _len = 223
+        build_msg = self.db.build(_len, 0x41, 2)
+        struct.pack_into(
+            '<BHHHLBL', build_msg, 0, 0xA5, _len-11, 0x4110,
+            0, self.snr, 2, self._emu_timestamp())
+        self.ifc.fwd_add(build_msg)
+        self.ifc.fwd_add(struct.pack('<BB', 0, 0x15))    # crc & stop
+
    def __set_config_parms(self, inv: dict):
        '''init connection with params from the configuration'''
        self.node_id = inv['node_id']
        self.sug_area = inv['suggested_area']
        self.modbus_polling = inv['modbus_polling']
        self.sensor_list = inv['sensor_list']
+        if self.mb:
+            self.mb.set_node_id(self.node_id)

-    def __set_serial_no(self, snr: int):
+    def _set_serial_no(self, snr: int):
        '''check the serial number and configure the inverter connection'''
        serial_no = str(snr)
        if self.unique_id == serial_no:
@@ -211,7 +431,8 @@ class SolarmanV5(Message):
                    self.db.set_pv_module_details(inv)
                    logger.debug(f'SerialNo {serial_no} allowed! area:{self.sug_area}')  # noqa: E501

-                    self.db.set_db_def_value(Register.COLLECTOR_SNR, key)
+                    self.db.set_db_def_value(Register.COLLECTOR_SNR, snr)
+                    self.db.set_db_def_value(Register.SERIAL_NUMBER, key)
                    break
            else:
                self.node_id = ''
@@ -225,219 +446,71 @@ class SolarmanV5(Message):

            self.unique_id = serial_no

-    def read(self) -> float:
-        '''process all received messages in the _recv_buffer'''
-        self._read()
-        while True:
-            if not self.header_valid:
-                self.__parse_header(self._recv_buffer, len(self._recv_buffer))
-
-            if self.header_valid and len(self._recv_buffer) >= \
-               (self.header_len + self.data_len+2):
-                self.__process_complete_received_msg()
-                self.__flush_recv_msg()
-            else:
-                return 0  # wait 0s before sending a response
-
-    def __process_complete_received_msg(self):
-        log_lvl = self.log_lvl.get(self.control, logging.WARNING)
-        if callable(log_lvl):
-            log_lvl = log_lvl()
-        hex_dump_memory(log_lvl, f'Received from {self.addr}:',
-                        self._recv_buffer, self.header_len +
-                        self.data_len+2)
-        if self.__trailer_is_ok(self._recv_buffer, self.header_len
-                                + self.data_len + 2):
-            if self.state == State.init:
-                self.state = State.received
-            self.__set_serial_no(self.snr)
-            self.__dispatch_msg()
-
    def forward(self, buffer, buflen) -> None:
        '''add the actual receive msg to the forwarding queue'''
        if self.no_forwarding:
            return
        tsun = Config.get('solarman')
        if tsun['enabled']:
-            self._forward_buffer += buffer[:buflen]
-            hex_dump_memory(logging.DEBUG, 'Store for forwarding:',
-                            buffer, buflen)
+            self.ifc.fwd_add(buffer[:buflen])
+            self.ifc.fwd_log(logging.DEBUG, 'Store for forwarding:')

-            fnc = self.switch.get(self.control, self.msg_unknown)
-            logger.info(self.__flow_str(self.server_side, 'forwrd') +
+            _, _str = self.get_fnc_handler(self.control)
+            logger.info(self._flow_str(self.server_side, 'forwrd') +
                        f' Ctl: {int(self.control):#04x}'
-                        f' Msg: {fnc.__name__!r}')
+                        f' Msg: {_str}')

    def _init_new_client_conn(self) -> bool:
        return False

-    '''
-    Our private methods
-    '''
-    def __flow_str(self, server_side: bool, type: str):  # noqa: F821
-        switch = {
-            'rx':      '  <',
-            'tx':      '  >',
-            'forwrd':  '<< ',
-            'drop':    ' xx',
-            'rxS':     '>  ',
-            'txS':     '<  ',
-            'forwrdS': ' >>',
-            'dropS':   'xx ',
-        }
-        if server_side:
-            type += 'S'
-        return switch.get(type, '???')
-
-    def _timestamp(self):
-        # utc as epoche
-        return int(time.time())    # pragma: no cover
-
    def _heartbeat(self) -> int:
        return 60                  # pragma: no cover

-    def __parse_header(self, buf: bytes, buf_len: int) -> None:
-
-        if (buf_len < self.header_len):  # enough bytes for complete header?
-            return
-
-        result = struct.unpack_from('<BHHHL', buf, 0)
-
-        # store parsed header values in the class
-        start = result[0]            # start byte
-        self.data_len = result[1]    # len of variable id string
-        self.control = result[2]
-        self.seq.set_recv(result[3])
-        self.snr = result[4]
-
-        if start != 0xA5:
-            hex_dump_memory(logging.ERROR,
-                            'Drop packet w invalid start byte from'
-                            f' {self.addr}:', buf, buf_len)
-
-            self.inc_counter('Invalid_Msg_Format')
-            # erase broken recv buffer
-            self._recv_buffer = bytearray()
-            return
-        self.header_valid = True
-
-    def __trailer_is_ok(self, buf: bytes, buf_len: int) -> bool:
-        crc = buf[self.data_len+11]
-        stop = buf[self.data_len+12]
-        if stop != 0x15:
-            hex_dump_memory(logging.ERROR,
-                            'Drop packet w invalid stop byte from '
-                            f'{self.addr}:', buf, buf_len)
-            self.inc_counter('Invalid_Msg_Format')
-            if len(self._recv_buffer) > (self.data_len+13):
-                next_start = buf[self.data_len+13]
-                if next_start != 0xa5:
-                    # erase broken recv buffer
-                    self._recv_buffer = bytearray()
-
-            return False
-
-        check = sum(buf[1:buf_len-2]) & 0xff
-        if check != crc:
-            self.inc_counter('Invalid_Msg_Format')
-            logger.debug(f'CRC {int(crc):#02x} {int(check):#08x}'
-                         f' Stop:{int(stop):#02x}')
-            # start & stop byte are valid, discard only this message
-            return False
-
-        return True
-
-    def __build_header(self, ctrl) -> None:
-        '''build header for new transmit message'''
-        self.send_msg_ofs = len(self._send_buffer)
-
-        self._send_buffer += struct.pack(
-            '<BHHHL', 0xA5, 0, ctrl, self.seq.get_send(), self.snr)
-        fnc = self.switch.get(ctrl, self.msg_unknown)
-        logger.info(self.__flow_str(self.server_side, 'tx') +
-                    f' Ctl: {int(ctrl):#04x} Msg: {fnc.__name__!r}')
-
-    def __finish_send_msg(self) -> None:
-        '''finish the transmit message, set lenght and checksum'''
-        _len = len(self._send_buffer) - self.send_msg_ofs
-        struct.pack_into('<H', self._send_buffer, self.send_msg_ofs+1, _len-11)
-        check = sum(self._send_buffer[self.send_msg_ofs+1:self.send_msg_ofs +
-                                      _len]) & 0xff
-        self._send_buffer += struct.pack('<BB', check, 0x15)    # crc & stop
-
-    def _update_header(self, _forward_buffer):
-        '''update header for message before forwarding,
-        set sequence and checksum'''
-        _len = len(_forward_buffer)
-        ofs = 0
-        while ofs < _len:
-            result = struct.unpack_from('<BH', _forward_buffer, ofs)
-            data_len = result[1]    # len of variable id string
-
-            struct.pack_into('<H', _forward_buffer, ofs+5,
-                             self.seq.get_send())
-
-            check = sum(_forward_buffer[ofs+1:ofs+data_len+11]) & 0xff
-            struct.pack_into('<B', _forward_buffer, ofs+data_len+11, check)
-            ofs += (13 + data_len)
-
-    def __dispatch_msg(self) -> None:
-        fnc = self.switch.get(self.control, self.msg_unknown)
-        if self.unique_id:
-            logger.info(self.__flow_str(self.server_side, 'rx') +
-                        f' Ctl: {int(self.control):#04x}' +
-                        f' Msg: {fnc.__name__!r}')
-            fnc()
-        else:
-            logger.info(self.__flow_str(self.server_side, 'drop') +
-                        f' Ctl: {int(self.control):#04x}' +
-                        f' Msg: {fnc.__name__!r}')
-
-    def __flush_recv_msg(self) -> None:
-        self._recv_buffer = self._recv_buffer[(self.header_len +
-                                               self.data_len+2):]
-        self.header_valid = False
-
    def __send_ack_rsp(self, msgtype, ftype, ack=1):
-        self.__build_header(msgtype)
-        self._send_buffer += struct.pack('<BBLL', ftype, ack,
-                                         self._timestamp(),
-                                         self._heartbeat())
-        self.__finish_send_msg()
+        self._build_header(msgtype)
+        self.ifc.tx_add(struct.pack('<BBLL', ftype, ack,
+                                    self._timestamp(),
+                                    self._heartbeat()))
+        self._finish_send_msg()

    def send_modbus_cb(self, pdu: bytearray, log_lvl: int, state: str):
        if self.state != State.up:
            logger.warning(f'[{self.node_id}] ignore MODBUS cmd,'
                           ' cause the state is not UP anymore')
            return
-        self.__build_header(0x4510)
-        self._send_buffer += struct.pack('<BHLLL', self.MB_RTU_CMD,
-                                         self.sensor_list, 0, 0, 0)
-        self._send_buffer += pdu
-        self.__finish_send_msg()
-        hex_dump_memory(log_lvl, f'Send Modbus {state}:{self.addr}:',
-                        self._send_buffer, len(self._send_buffer))
-        self.writer.write(self._send_buffer)
-        self._send_buffer = bytearray(0)  # self._send_buffer[sent:]
-
-    def _send_modbus_cmd(self, func, addr, val, log_lvl) -> None:
-        if self.state != State.up:
-            logger.log(log_lvl, f'[{self.node_id}] ignore MODBUS cmd,'
-                       ' as the state is not UP')
-            return
-        self.mb.build_msg(Modbus.INV_ADDR, func, addr, val, log_lvl)
-
-    async def send_modbus_cmd(self, func, addr, val, log_lvl) -> None:
-        self._send_modbus_cmd(func, addr, val, log_lvl)
+        self._build_header(0x4510)
+        self.ifc.tx_add(struct.pack('<BHLLL', self.MB_RTU_CMD,
+                                    self.sensor_list, 0, 0, 0))
+        self.ifc.tx_add(pdu)
+        self._finish_send_msg()
+        self.ifc.tx_log(log_lvl, f'Send Modbus {state}:{self.addr}:')
+        self.ifc.tx_flush()

    def mb_timout_cb(self, exp_cnt):
        self.mb_timer.start(self.mb_timeout)
+        if self.sensor_list != 0x02b0:
+            self.mb_start_reg += self.mb_incr_reg
+            if self.mb_start_reg > 0xffff:
+                self.mb_start_reg = self.mb_start_reg & 0xffff
+                self.mb_inv_no += 1
+                logging.info(f"Next Round: inv:{self.mb_inv_no}"
+                             f" reg:{self.mb_start_reg:04x}")
+            if (self.mb_start_reg & 0xfffc) % 0x80 == 0:
+                logging.info(f"Scan info: inv:{self.mb_inv_no}"
+                             f" reg:{self.mb_start_reg:04x}")
+            self._send_modbus_cmd(self.mb_inv_no, Modbus.READ_REGS,
+                                  self.mb_start_reg, self.mb_scan_len,
+                                  logging.INFO)
+        else:
+            self._send_modbus_cmd(Modbus.INV_ADDR, Modbus.READ_REGS, 0x3000,
+                                  48, logging.DEBUG)

-        self._send_modbus_cmd(Modbus.READ_REGS, 0x3000, 48, logging.DEBUG)
-
-        if 1 == (exp_cnt % 30):
-            # logging.info("Regular Modbus Status request")
-            self._send_modbus_cmd(Modbus.READ_REGS, 0x2000, 96, logging.DEBUG)
+            if 1 == (exp_cnt % 30):
+                # logging.info("Regular Modbus Status request")
+                self._send_modbus_cmd(Modbus.INV_ADDR, Modbus.READ_REGS,
+                                      0x5000, 8, logging.DEBUG)
+                self._send_modbus_cmd(Modbus.INV_ADDR, Modbus.READ_REGS,
+                                      0x2000, 96, logging.DEBUG)

    def at_cmd_forbidden(self, cmd: str, connection: str) -> bool:
        return not cmd.startswith(tuple(self.at_acl[connection]['allow'])) or \
@@ -459,18 +532,19 @@ class SolarmanV5(Message):
            return

        self.forward_at_cmd_resp = False
-        self.__build_header(0x4510)
-        self._send_buffer += struct.pack(f'<BHLLL{len(at_cmd)}sc', self.AT_CMD,
-                                         0x0002, 0, 0, 0,
-                                         at_cmd.encode('utf-8'), b'\r')
-        self.__finish_send_msg()
+        self._build_header(0x4510)
+        self.ifc.tx_add(struct.pack(f'<BHLLL{len(at_cmd)}sc', self.AT_CMD,
+                                    0x0002, 0, 0, 0,
+                                    at_cmd.encode('utf-8'), b'\r'))
+        self._finish_send_msg()
+        self.ifc.tx_log(logging.INFO, 'Send AT Command:')
        try:
-            await self.async_write('Send AT Command:')
+            self.ifc.tx_flush()
        except Exception:
-            self._send_buffer = bytearray(0)
+            self.ifc.tx_clear()

    def __forward_msg(self):
-        self.forward(self._recv_buffer, self.header_len+self.data_len+2)
+        self.forward(self.ifc.rx_peek(), self.header_len+self.data_len+2)

    def __build_model_name(self):
        db = self.db
@@ -491,7 +565,7 @@ class SolarmanV5(Message):
    def __process_data(self, ftype, ts):
        inv_update = False
        msg_type = self.control >> 8
-        for key, update in self.db.parse(self._recv_buffer, msg_type, ftype,
+        for key, update in self.db.parse(self.ifc.rx_peek(), msg_type, ftype,
                                         self.node_id):
            if update:
                if key == 'inverter':
@@ -510,7 +584,7 @@ class SolarmanV5(Message):
        self.__forward_msg()

    def msg_dev_ind(self):
-        data = self._recv_buffer[self.header_len:]
+        data = self.ifc.rx_peek()[self.header_len:]
        result = struct.unpack_from(self.HDR_FMT, data, 0)
        ftype = result[0]  # always 2
        total = result[1]
@@ -531,7 +605,7 @@ class SolarmanV5(Message):
        self.__send_ack_rsp(0x1110, ftype)

    def msg_data_ind(self):
-        data = self._recv_buffer
+        data = self.ifc.rx_peek()
        result = struct.unpack_from('<BHLLLHL', data, self.header_len)
        ftype = result[0]  # 1 or 0x81
        sensor = result[1]
@@ -559,7 +633,7 @@ class SolarmanV5(Message):
        self.new_state_up()

    def msg_sync_start(self):
-        data = self._recv_buffer[self.header_len:]
+        data = self.ifc.rx_peek()[self.header_len:]
        result = struct.unpack_from(self.HDR_FMT, data, 0)
        ftype = result[0]
        total = result[1]
@@ -572,8 +646,8 @@ class SolarmanV5(Message):
        self.__send_ack_rsp(0x1310, ftype)

    def msg_command_req(self):
-        data = self._recv_buffer[self.header_len:
-                                 self.header_len+self.data_len]
+        data = self.ifc.rx_peek()[self.header_len:
+                                  self.header_len+self.data_len]
        result = struct.unpack_from('<B', data, 0)
        ftype = result[0]
        if ftype == self.AT_CMD:
@@ -585,9 +659,9 @@ class SolarmanV5(Message):
            self.forward_at_cmd_resp = True

        elif ftype == self.MB_RTU_CMD:
-            if self.remote_stream.mb.recv_req(data[15:],
-                                              self.remote_stream.
-                                              __forward_msg):
+            rstream = self.ifc.remote.stream
+            if rstream.mb.recv_req(data[15:],
+                                   rstream.__forward_msg):
                self.inc_counter('Modbus_Command')
            else:
                logger.error('Invalid Modbus Msg')
@@ -601,7 +675,7 @@ class SolarmanV5(Message):
            self.mqtt.publish(key, data))

    def get_cmd_rsp_log_lvl(self) -> int:
-        ftype = self._recv_buffer[self.header_len]
+        ftype = self.ifc.rx_peek()[self.header_len]
        if ftype == self.AT_CMD:
            if self.forward_at_cmd_resp:
                return logging.INFO
@@ -613,8 +687,8 @@ class SolarmanV5(Message):
        return logging.WARNING

    def msg_command_rsp(self):
-        data = self._recv_buffer[self.header_len:
-                                 self.header_len+self.data_len]
+        data = self.ifc.rx_peek()[self.header_len:
+                                  self.header_len+self.data_len]
        ftype = data[0]
        if ftype == self.AT_CMD:
            if not self.forward_at_cmd_resp:
@@ -629,6 +703,18 @@ class SolarmanV5(Message):
            return
        self.__forward_msg()

+    def __parse_modbus_rsp(self, data):
+        inv_update = False
+        self.modbus_elms = 0
+        for key, update, _ in self.mb.recv_resp(self.db, data[14:]):
+            self.modbus_elms += 1
+            if update:
+                if key == 'inverter':
+                    inv_update = True
+                self._set_mqtt_timestamp(key, self._timestamp())
+                self.new_data[key] = True
+        return inv_update
+
    def __modbus_command_rsp(self, data):
        '''precess MODBUS RTU response'''
        valid = data[1]
@@ -636,10 +722,16 @@ class SolarmanV5(Message):
        # logger.debug(f'modbus_len:{modbus_msg_len} accepted:{valid}')
        if valid == 1 and modbus_msg_len > 4:
            # logger.info(f'first byte modbus:{data[14]}')
-            inv_update = False
+            inv_update = self.__parse_modbus_rsp(data)
            self.modbus_elms = 0
-            for key, update, _ in self.mb.recv_resp(self.db, data[14:],
-                                                    self.node_id):
+            if (self.sensor_list != 0x02b0 and data[15] != 0):
+                logging.info('Valid MODBUS data '
+                             f'(inv:{self.mb_inv_no} '
+                             f'reg: 0x{self.mb.last_reg:04x}):')
+                hex_dump_memory(logging.INFO, 'Valid MODBUS data '
+                                f'(reg: 0x{self.mb.last_reg:04x}):',
+                                data[14:], modbus_msg_len)
+            for key, update, _ in self.mb.recv_resp(self.db, data[14:]):
                self.modbus_elms += 1
                if update:
                    if key == 'inverter':
@@ -649,8 +741,11 @@ class SolarmanV5(Message):
            if inv_update:
                self.__build_model_name()

+            if self.establish_inv_emu and not self.ifc.remote.stream:
+                self.establish_emu()
+
    def msg_hbeat_ind(self):
-        data = self._recv_buffer[self.header_len:]
+        data = self.ifc.rx_peek()[self.header_len:]
        result = struct.unpack_from('<B', data, 0)
        ftype = result[0]

@@ -659,7 +754,7 @@ class SolarmanV5(Message):
        self.new_state_up()

    def msg_sync_end(self):
-        data = self._recv_buffer[self.header_len:]
+        data = self.ifc.rx_peek()[self.header_len:]
        result = struct.unpack_from(self.HDR_FMT, data, 0)
        ftype = result[0]
        total = result[1]
@@ -670,16 +765,3 @@ class SolarmanV5(Message):

        self.__forward_msg()
        self.__send_ack_rsp(0x1810, ftype)
-
-    def msg_response(self):
-        data = self._recv_buffer[self.header_len:]
-        result = struct.unpack_from('<BBLL', data, 0)
-        ftype = result[0]  # always 2
-        valid = result[1] == 1  # status
-        ts = result[2]
-        set_hb = result[3]  # always 60 or 120
-        logger.debug(f'ftype:{ftype} accepted:{valid}'
-                     f' ts:{ts:08x}  nextHeartbeat: {set_hb}s')
-
-        dt = datetime.fromtimestamp(ts)
-        logger.debug(f'ts: {dt.strftime("%Y-%m-%d %H:%M:%S")}')
--- a/app/src/infos.py
+++ b/app/src/infos.py
@@ -1,5 +1,6 @@
 import logging
 import json
+import struct
 import os
 from enum import Enum
 from typing import Generator
@@ -25,7 +26,10 @@ class Register(Enum):
    EQUIPMENT_MODEL = 24
    NO_INPUTS = 25
    MAX_DESIGNED_POWER = 26
-    OUTPUT_COEFFICIENT = 27
+    RATED_LEVEL = 27
+    INPUT_COEFFICIENT = 28
+    GRID_VOLT_CAL_COEF = 29
+    OUTPUT_COEFFICIENT = 30
    INVERTER_CNT = 50
    UNKNOWN_SNR = 51
    UNKNOWN_MSG = 52
@@ -38,10 +42,13 @@ class Register(Enum):
    AT_COMMAND = 59
    MODBUS_COMMAND = 60
    AT_COMMAND_BLOCKED = 61
+    CLOUD_CONN_CNT = 62
    OUTPUT_POWER = 83
    RATED_POWER = 84
    INVERTER_TEMP = 85
    INVERTER_STATUS = 86
+    DETECT_STATUS_1 = 87
+    DETECT_STATUS_2 = 88
    PV1_VOLTAGE = 100
    PV1_CURRENT = 101
    PV1_POWER = 102
@@ -84,6 +91,12 @@ class Register(Enum):
    PV5_TOTAL_GENERATION = 241
    PV6_DAILY_GENERATION = 250
    PV6_TOTAL_GENERATION = 251
+    INV_UNKNOWN_1 = 252
+    BOOT_STATUS = 253
+    DSP_STATUS = 254
+    WORK_MODE = 255
+    OUTPUT_SHUTDOWN = 256
+
    GRID_VOLTAGE = 300
    GRID_CURRENT = 301
    GRID_FREQUENCY = 302
@@ -99,22 +112,11 @@ class Register(Enum):
    IP_ADDRESS = 407
    POLLING_INTERVAL = 408
    SENSOR_LIST = 409
-    EVENT_401 = 500
-    EVENT_402 = 501
-    EVENT_403 = 502
-    EVENT_404 = 503
-    EVENT_405 = 504
-    EVENT_406 = 505
-    EVENT_407 = 506
-    EVENT_408 = 507
-    EVENT_409 = 508
-    EVENT_410 = 509
-    EVENT_411 = 510
-    EVENT_412 = 511
-    EVENT_413 = 512
-    EVENT_414 = 513
-    EVENT_415 = 514
-    EVENT_416 = 515
+    SSID = 410
+    EVENT_ALARM = 500
+    EVENT_FAULT = 501
+    EVENT_BF1 = 502
+    EVENT_BF2 = 503
    TS_INPUT = 600
    TS_GRID = 601
    TS_TOTAL = 602
@@ -123,6 +125,76 @@ class Register(Enum):
    TEST_REG2 = 10001


+class Fmt:
+    @staticmethod
+    def get_value(buf: bytes, idx: int, row: dict):
+        '''Get a value from buf and interpret as in row defined'''
+        fmt = row['fmt']
+        res = struct.unpack_from(fmt, buf, idx)
+        result = res[0]
+        if isinstance(result, (bytearray, bytes)):
+            result = result.decode().split('\x00')[0]
+        if 'func' in row:
+            result = row['func'](res)
+        if 'ratio' in row:
+            result = round(result * row['ratio'], 2)
+        if 'quotient' in row:
+            result = round(result/row['quotient'])
+        if 'offset' in row:
+            result = result + row['offset']
+        return result
+
+    @staticmethod
+    def hex4(val: tuple | str, reverse=False) -> str | int:
+        if not reverse:
+            return f'{val[0]:04x}'
+        else:
+            return int(val, 16)
+
+    @staticmethod
+    def mac(val: tuple | str, reverse=False) -> str | tuple:
+        if not reverse:
+            return "%02x:%02x:%02x:%02x:%02x:%02x" % val
+        else:
+            return (
+                int(val[0:2], 16), int(val[3:5], 16),
+                int(val[6:8], 16), int(val[9:11], 16),
+                int(val[12:14], 16), int(val[15:], 16))
+
+    @staticmethod
+    def version(val: tuple | str, reverse=False) -> str | int:
+        if not reverse:
+            x = val[0]
+            return f'V{(x >> 12)}.{(x >> 8) & 0xf}' \
+                f'.{(x >> 4) & 0xf}{x & 0xf:1X}'
+        else:
+            arr = val[1:].split('.')
+            return int(arr[0], 10) << 12 | \
+                int(arr[1], 10) << 8 | \
+                int(arr[2][:-1], 10) << 4 | \
+                int(arr[2][-1:], 16)
+
+    @staticmethod
+    def set_value(buf: bytearray, idx: int, row: dict, val):
+        '''Get a value from buf and interpret as in row defined'''
+        fmt = row['fmt']
+        if 'offset' in row:
+            val = val - row['offset']
+        if 'quotient' in row:
+            val = round(val * row['quotient'])
+        if 'ratio' in row:
+            val = round(val / row['ratio'])
+        if 'func' in row:
+            val = row['func'](val, reverse=True)
+        if isinstance(val, str):
+            val = bytes(val, 'UTF8')
+
+        if isinstance(val, tuple):
+            struct.pack_into(fmt, buf, idx, *val)
+        else:
+            struct.pack_into(fmt, buf, idx, val)
+
+
 class ClrAtMidnight:
    __clr_at_midnight = [Register.PV1_DAILY_GENERATION, Register.PV2_DAILY_GENERATION, Register.PV3_DAILY_GENERATION, Register.PV4_DAILY_GENERATION, Register.PV5_DAILY_GENERATION, Register.PV6_DAILY_GENERATION, Register.DAILY_GENERATION]   # noqa: E501
    db = {}
@@ -152,6 +224,8 @@ class ClrAtMidnight:


 class Infos:
+    __slots__ = ('db', 'tracer', )
+
    LIGHTNING = 'mdi:lightning-bolt'
    COUNTER = 'mdi:counter'
    GAUGE = 'mdi:gauge'
@@ -201,6 +275,7 @@ class Infos:
    }

    __comm_type_val_tpl = "{%set com_types = ['n/a','Wi-Fi', 'G4', 'G5', 'GPRS'] %}{{com_types[value_json['Communication_Type']|int(0)]|default(value_json['Communication_Type'])}}"    # noqa: E501
+    __work_mode_val_tpl = "{%set mode = ['Normal-Mode', 'Aging-Mode', 'ATE-Mode', 'Shielding GFDI', 'DTU-Mode'] %}{{mode[value_json['Work_Mode']|int(0)]|default(value_json['Work_Mode'])}}"    # noqa: E501
    __status_type_val_tpl = "{%set inv_status = ['Off-line', 'On-grid', 'Off-grid'] %}{{inv_status[value_json['Inverter_Status']|int(0)]|default(value_json['Inverter_Status'])}}"    # noqa: E501
    __rated_power_val_tpl = "{% if 'Rated_Power' in value_json and value_json['Rated_Power'] != None %}{{value_json['Rated_Power']|string() +' W'}}{% else %}{{ this.state }}{% endif %}"  # noqa: E501
    __designed_power_val_tpl = '''
@@ -215,6 +290,100 @@ class Infos:
  {{ this.state }}
 {% endif %}
 '''
+    __inv_alarm_val_tpl = '''
+{% if 'Inverter_Alarm' in value_json and
+      value_json['Inverter_Alarm'] != None %}
+  {% set val_int = value_json['Inverter_Alarm'] | int %}
+  {% if val_int == 0 %}
+    {% set result = 'noAlarm'%}
+  {%else%}
+    {% set result = '' %}
+    {% if val_int | bitwise_and(1)%}{% set result = result + 'Bit1, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(2)%}{% set result = result + 'Bit2, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(3)%}{% set result = result + 'Bit3, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(4)%}{% set result = result + 'Bit4, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(5)%}{% set result = result + 'Bit5, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(6)%}{% set result = result + 'Bit6, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(7)%}{% set result = result + 'Bit7, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(8)%}{% set result = result + 'Bit8, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(9)%}{% set result = result + 'noUtility, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(10)%}{% set result = result + 'Bit10, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(11)%}{% set result = result + 'Bit11, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(12)%}{% set result = result + 'Bit12, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(13)%}{% set result = result + 'Bit13, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(14)%}{% set result = result + 'Bit14, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(15)%}{% set result = result + 'Bit15, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(16)%}{% set result = result + 'Bit16, '%}
+    {% endif %}
+  {% endif %}
+  {{ result }}
+{% else %}
+  {{ this.state }}
+{% endif %}
+'''
+    __inv_fault_val_tpl = '''
+{% if 'Inverter_Fault' in value_json and
+      value_json['Inverter_Fault'] != None %}
+  {% set val_int = value_json['Inverter_Fault'] | int %}
+  {% if val_int == 0 %}
+    {% set result = 'noFault'%}
+  {%else%}
+    {% set result = '' %}
+    {% if val_int | bitwise_and(1)%}{% set result = result + 'Bit1, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(2)%}{% set result = result + 'Bit2, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(3)%}{% set result = result + 'Bit3, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(4)%}{% set result = result + 'Bit4, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(5)%}{% set result = result + 'Bit5, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(6)%}{% set result = result + 'Bit6, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(7)%}{% set result = result + 'Bit7, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(8)%}{% set result = result + 'Bit8, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(9)%}{% set result = result + 'Bit9, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(10)%}{% set result = result + 'Bit10, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(11)%}{% set result = result + 'Bit11, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(12)%}{% set result = result + 'Bit12, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(13)%}{% set result = result + 'Bit13, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(14)%}{% set result = result + 'Bit14, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(15)%}{% set result = result + 'Bit15, '%}
+    {% endif %}
+    {% if val_int | bitwise_and(16)%}{% set result = result + 'Bit16, '%}
+    {% endif %}
+  {% endif %}
+  {{ result }}
+{% else %}
+  {{ this.state }}
+{% endif %}
+'''
+
+    __input_coef_val_tpl = "{% if 'Output_Coefficient' in value_json and value_json['Input_Coefficient'] != None %}{{value_json['Input_Coefficient']|string() +' %'}}{% else %}{{ this.state }}{% endif %}"  # noqa: E501
    __output_coef_val_tpl = "{% if 'Output_Coefficient' in value_json and value_json['Output_Coefficient'] != None %}{{value_json['Output_Coefficient']|string() +' %'}}{% else %}{{ this.state }}{% endif %}"  # noqa: E501

    __info_defs = {
@@ -237,6 +406,8 @@ class Infos:
        Register.NO_INPUTS:       {'name': ['inverter', 'No_Inputs'],              'level': logging.DEBUG, 'unit': ''},  # noqa: E501
        Register.MAX_DESIGNED_POWER: {'name': ['inverter',  'Max_Designed_Power'], 'level': logging.INFO,  'unit': 'W',    'ha': {'dev': 'inverter', 'dev_cla': None, 'stat_cla': None, 'id': 'designed_power_', 'val_tpl': __designed_power_val_tpl, 'name': 'Max Designed Power', 'icon': LIGHTNING, 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.RATED_POWER:        {'name': ['inverter',  'Rated_Power'],        'level': logging.DEBUG, 'unit': 'W',    'ha': {'dev': 'inverter', 'dev_cla': None, 'stat_cla': None, 'id': 'rated_power_',    'val_tpl': __rated_power_val_tpl,    'name': 'Rated Power',        'icon': LIGHTNING, 'ent_cat': 'diagnostic'}},  # noqa: E501
+        Register.WORK_MODE:          {'name': ['inverter',  'Work_Mode'],          'level': logging.DEBUG, 'unit': '',     'ha': {'dev': 'inverter', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'work_mode_', 'name': 'Work Mode', 'val_tpl': __work_mode_val_tpl,  'icon': 'mdi:power', 'ent_cat': 'diagnostic'}},  # noqa: E501
+        Register.INPUT_COEFFICIENT:  {'name': ['inverter',  'Input_Coefficient'],  'level': logging.DEBUG, 'unit': '%',    'ha': {'dev': 'inverter', 'dev_cla': None, 'stat_cla': None, 'id': 'input_coef_',    'val_tpl': __input_coef_val_tpl,    'name': 'Input Coefficient', 'icon': LIGHTNING, 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.OUTPUT_COEFFICIENT: {'name': ['inverter',  'Output_Coefficient'], 'level': logging.INFO,  'unit': '%',    'ha': {'dev': 'inverter', 'dev_cla': None, 'stat_cla': None, 'id': 'output_coef_',    'val_tpl': __output_coef_val_tpl,    'name': 'Output Coefficient', 'icon': LIGHTNING, 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.PV1_MANUFACTURER: {'name': ['inverter', 'PV1_Manufacturer'],      'level': logging.DEBUG, 'unit': ''},  # noqa: E501
        Register.PV1_MODEL:        {'name': ['inverter', 'PV1_Model'],             'level': logging.DEBUG, 'unit': ''},  # noqa: E501
@@ -250,9 +421,11 @@ class Infos:
        Register.PV5_MODEL:        {'name': ['inverter', 'PV5_Model'],             'level': logging.DEBUG, 'unit': ''},  # noqa: E501
        Register.PV6_MANUFACTURER: {'name': ['inverter', 'PV6_Manufacturer'],      'level': logging.DEBUG, 'unit': ''},  # noqa: E501
        Register.PV6_MODEL:        {'name': ['inverter', 'PV6_Model'],             'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-
+        Register.BOOT_STATUS:      {'name': ['inverter', 'BOOT_STATUS'],           'level': logging.DEBUG, 'unit': ''},  # noqa: E501
+        Register.DSP_STATUS:       {'name': ['inverter', 'DSP_STATUS'],            'level': logging.DEBUG, 'unit': ''},  # noqa: E501
        # proxy:
        Register.INVERTER_CNT:       {'name': ['proxy', 'Inverter_Cnt'],       'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'inv_count_',     'fmt': FMT_INT, 'name': 'Active Inverter Connections',    'icon': COUNTER}},  # noqa: E501
+        Register.CLOUD_CONN_CNT:     {'name': ['proxy', 'Cloud_Conn_Cnt'],     'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'cloud_conn_count_', 'fmt': FMT_INT, 'name': 'Active Cloud Connections',    'icon': COUNTER}},  # noqa: E501
        Register.UNKNOWN_SNR:        {'name': ['proxy', 'Unknown_SNR'],        'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'unknown_snr_',   'fmt': FMT_INT, 'name': 'Unknown Serial No',    'icon': COUNTER, 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.UNKNOWN_MSG:        {'name': ['proxy', 'Unknown_Msg'],        'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'unknown_msg_',   'fmt': FMT_INT, 'name': 'Unknown Msg Type',     'icon': COUNTER, 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.INVALID_DATA_TYPE:  {'name': ['proxy', 'Invalid_Data_Type'],  'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'inv_data_type_', 'fmt': FMT_INT, 'name': 'Invalid Data Type',    'icon': COUNTER, 'ent_cat': 'diagnostic'}},  # noqa: E501
@@ -267,22 +440,12 @@ class Infos:
        # 0xffffff03:  {'name':['proxy', 'Voltage'],                        'level': logging.DEBUG, 'unit': 'V',    'ha':{'dev':'proxy', 'dev_cla': 'voltage',     'stat_cla': 'measurement', 'id':'proxy_volt_',  'fmt':FMT_FLOAT,'name': 'Grid Voltage'}},  # noqa: E501

        # events
-        Register.EVENT_401:  {'name': ['events', '401_'],                          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_402:  {'name': ['events', '402_'],                          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_403:  {'name': ['events', '403_'],                          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_404:  {'name': ['events', '404_'],                          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_405:  {'name': ['events', '405_'],                          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_406:  {'name': ['events', '406_'],                          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_407:  {'name': ['events', '407_'],                          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_408:  {'name': ['events', '408_'],                          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_409:  {'name': ['events', '409_No_Utility'],                'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_410:  {'name': ['events', '410_'],                          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_411:  {'name': ['events', '411_'],                          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_412:  {'name': ['events', '412_'],                          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_413:  {'name': ['events', '413_'],                          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_414:  {'name': ['events', '414_'],                          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_415:  {'name': ['events', '415_GridFreqOverRating'],        'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.EVENT_416:  {'name': ['events', '416_'],                          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
+        Register.EVENT_ALARM:  {'name': ['events', 'Inverter_Alarm'],              'level': logging.INFO, 'unit': '', 'ha': {'dev': 'inverter', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'inv_alarm_', 'name': 'Inverter Alarm', 'val_tpl': __inv_alarm_val_tpl, 'icon': 'mdi:alarm-light'}},  # noqa: E501
+        Register.EVENT_FAULT:  {'name': ['events', 'Inverter_Fault'],              'level': logging.INFO, 'unit': '', 'ha': {'dev': 'inverter', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'inv_fault_', 'name': 'Inverter Fault', 'val_tpl': __inv_fault_val_tpl, 'icon': 'mdi:alarm-light'}},  # noqa: E501
+        Register.EVENT_BF1:    {'name': ['events', 'Inverter_Bitfield_1'],         'level': logging.INFO, 'unit': ''},  # noqa: E501
+        Register.EVENT_BF2:    {'name': ['events', 'Inverter_bitfield_2'],         'level': logging.INFO, 'unit': ''},  # noqa: E501
+        # Register.EVENT_409:  {'name': ['events', '409_No_Utility'],                'level': logging.DEBUG, 'unit': ''},  # noqa: E501
+        # Register.EVENT_415:  {'name': ['events', '415_GridFreqOverRating'],        'level': logging.DEBUG, 'unit': ''},  # noqa: E501

        # grid measures:
        Register.TS_GRID:         {'name': ['grid', 'Timestamp'],                  'level': logging.INFO,  'unit': ''},  # noqa: E501
@@ -292,6 +455,8 @@ class Infos:
        Register.OUTPUT_POWER:    {'name': ['grid', 'Output_Power'],               'level': logging.INFO,  'unit': 'W',    'ha': {'dev': 'inverter', 'dev_cla': 'power',       'stat_cla': 'measurement', 'id': 'out_power_', 'fmt': FMT_FLOAT, 'name': 'Power'}},  # noqa: E501
        Register.INVERTER_TEMP:   {'name': ['env',  'Inverter_Temp'],              'level': logging.DEBUG, 'unit': '°C',   'ha': {'dev': 'inverter', 'dev_cla': 'temperature', 'stat_cla': 'measurement', 'id': 'temp_',       'fmt': FMT_INT, 'name': 'Temperature'}},  # noqa: E501
        Register.INVERTER_STATUS: {'name': ['env',  'Inverter_Status'],            'level': logging.INFO,  'unit': '',     'ha': {'dev': 'inverter', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'inv_status_', 'name': 'Inverter Status', 'val_tpl': __status_type_val_tpl,          'icon': 'mdi:power'}},  # noqa: E501
+        Register.DETECT_STATUS_1: {'name': ['env',  'Detect_Status_1'],            'level': logging.DEBUG, 'unit': ''},  # noqa: E501
+        Register.DETECT_STATUS_2: {'name': ['env',  'Detect_Status_2'],            'level': logging.DEBUG, 'unit': ''},  # noqa: E501

        # input measures:
        Register.TS_INPUT:     {'name': ['input', 'Timestamp'],                    'level': logging.INFO,  'unit': ''},  # noqa: E501
@@ -341,6 +506,13 @@ class Infos:
        Register.IP_ADDRESS:         {'name': ['controller', 'IP_Address'],         'level': logging.DEBUG, 'unit': '',     'ha': {'dev': 'controller', 'dev_cla': None,       'stat_cla': None,          'id': 'ip_address_',           'fmt': '| string',        'name': 'IP Address', 'icon': WIFI, 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.POLLING_INTERVAL:   {'name': ['controller', 'Polling_Interval'],   'level': logging.DEBUG, 'unit': 's',    'ha': {'dev': 'controller', 'dev_cla': None,       'stat_cla': None,          'id': 'polling_intval_', 'fmt': FMT_STRING_SEC, 'name': 'Polling Interval', 'icon': UPDATE, 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.SENSOR_LIST:        {'name': ['controller', 'Sensor_List'],        'level': logging.INFO,  'unit': ''},  # noqa: E501
+        Register.SSID:               {'name': ['controller', 'WiFi_SSID'],          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
+
+        Register.OUTPUT_SHUTDOWN:    {'name': ['other', 'Output_Shutdown'],         'level': logging.DEBUG, 'unit': ''},  # noqa: E501
+        Register.RATED_LEVEL:        {'name': ['other', 'Rated_Level'],             'level': logging.DEBUG, 'unit': ''},  # noqa: E501
+        Register.GRID_VOLT_CAL_COEF: {'name': ['other', 'Grid_Volt_Cal_Coef'],      'level': logging.DEBUG, 'unit': ''},  # noqa: E501
+        Register.INV_UNKNOWN_1:      {'name': ['inv_unknown', 'Unknown_1'],         'level': logging.DEBUG, 'unit': ''},  # noqa: E501
+
    }

    @property
@@ -378,15 +550,19 @@ class Infos:

        return None                  # unknwon idx, not in info_defs

-    def inc_counter(self, counter: str) -> None:
+    @classmethod
+    def inc_counter(cls, counter: str) -> None:
        '''inc proxy statistic counter'''
-        db_dict = self.stat['proxy']
+        db_dict = cls.stat['proxy']
        db_dict[counter] += 1
+        cls.new_stat_data['proxy'] = True

-    def dec_counter(self, counter: str) -> None:
+    @classmethod
+    def dec_counter(cls, counter: str) -> None:
        '''dec proxy statistic counter'''
-        db_dict = self.stat['proxy']
+        db_dict = cls.stat['proxy']
        db_dict[counter] -= 1
+        cls.new_stat_data['proxy'] = True

    def ha_proxy_confs(self, ha_prfx: str, node_id: str, snr: str) \
            -> Generator[tuple[str, str, str, str], None, None]:
@@ -646,6 +822,8 @@ class Infos:

    def get_db_value(self, id: Register, not_found_result: any = None):
        '''get database value'''
+        if id not in self.info_defs:
+            return not_found_result
        row = self.info_defs[id]
        if isinstance(row, dict):
            keys = row['name']
--- a/app/src/inverter_base.py
+++ b/app/src/inverter_base.py
@@ -0,0 +1,187 @@
+import weakref
+import asyncio
+import logging
+import traceback
+import json
+import gc
+from aiomqtt import MqttCodeError
+from asyncio import StreamReader, StreamWriter
+
+if __name__ == "app.src.inverter_base":
+    from app.src.inverter_ifc import InverterIfc
+    from app.src.proxy import Proxy
+    from app.src.async_stream import StreamPtr
+    from app.src.async_stream import AsyncStreamClient
+    from app.src.async_stream import AsyncStreamServer
+    from app.src.config import Config
+    from app.src.infos import Infos
+else:  # pragma: no cover
+    from inverter_ifc import InverterIfc
+    from proxy import Proxy
+    from async_stream import StreamPtr
+    from async_stream import AsyncStreamClient
+    from async_stream import AsyncStreamServer
+    from config import Config
+    from infos import Infos
+
+logger_mqtt = logging.getLogger('mqtt')
+
+
+class InverterBase(InverterIfc, Proxy):
+
+    def __init__(self, reader: StreamReader, writer: StreamWriter,
+                 config_id: str, prot_class,
+                 client_mode: bool = False,
+                 remote_prot_class=None):
+        Proxy.__init__(self)
+        self._registry.append(weakref.ref(self))
+        self.addr = writer.get_extra_info('peername')
+        self.config_id = config_id
+        if remote_prot_class:
+            self.prot_class = remote_prot_class
+        else:
+            self.prot_class = prot_class
+        self.__ha_restarts = -1
+        self.remote = StreamPtr(None)
+        ifc = AsyncStreamServer(reader, writer,
+                                self.async_publ_mqtt,
+                                self.create_remote,
+                                self.remote)
+
+        self.local = StreamPtr(
+            prot_class(self.addr, ifc, True, client_mode), ifc
+        )
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc, tb) -> None:
+        logging.debug(f'InverterBase.__exit__() {self.addr}')
+        self.__del_remote()
+
+        self.local.stream.close()
+        self.local.stream = None
+        self.local.ifc.close()
+        self.local.ifc = None
+
+        # now explicitly call garbage collector to release unreachable objects
+        unreachable_obj = gc.collect()
+        logging.debug(
+            f'InverterBase.__exit: freed unreachable obj: {unreachable_obj}')
+
+    def __del_remote(self):
+        if self.remote.stream:
+            self.remote.stream.close()
+            self.remote.stream = None
+
+        if self.remote.ifc:
+            self.remote.ifc.close()
+            self.remote.ifc = None
+
+    async def disc(self, shutdown_started=False) -> None:
+        if self.remote.stream:
+            self.remote.stream.shutdown_started = shutdown_started
+        if self.remote.ifc:
+            await self.remote.ifc.disc()
+        if self.local.stream:
+            self.local.stream.shutdown_started = shutdown_started
+        if self.local.ifc:
+            await self.local.ifc.disc()
+
+    def healthy(self) -> bool:
+        logging.debug('InverterBase healthy()')
+
+        if self.local.ifc and not self.local.ifc.healthy():
+            return False
+        if self.remote.ifc and not self.remote.ifc.healthy():
+            return False
+        return True
+
+    async def create_remote(self) -> None:
+        '''Establish a client connection to the TSUN cloud'''
+
+        tsun = Config.get(self.config_id)
+        host = tsun['host']
+        port = tsun['port']
+        addr = (host, port)
+        stream = self.local.stream
+
+        try:
+            logging.info(f'[{stream.node_id}] Connect to {addr}')
+            connect = asyncio.open_connection(host, port)
+            reader, writer = await connect
+            ifc = AsyncStreamClient(
+                reader, writer, self.local, self.__del_remote)
+
+            self.remote.ifc = ifc
+            if hasattr(stream, 'id_str'):
+                self.remote.stream = self.prot_class(
+                    addr, ifc, server_side=False,
+                    client_mode=False, id_str=stream.id_str)
+            else:
+                self.remote.stream = self.prot_class(
+                    addr, ifc, server_side=False,
+                    client_mode=False)
+
+            logging.info(f'[{self.remote.stream.node_id}:'
+                         f'{self.remote.stream.conn_no}] '
+                         f'Connected to {addr}')
+            asyncio.create_task(self.remote.ifc.client_loop(addr))
+
+        except (ConnectionRefusedError, TimeoutError) as error:
+            logging.info(f'{error}')
+        except Exception:
+            Infos.inc_counter('SW_Exception')
+            logging.error(
+                f"Inverter: Exception for {addr}:\n"
+                f"{traceback.format_exc()}")
+
+    async def async_publ_mqtt(self) -> None:
+        '''publish data to MQTT broker'''
+        stream = self.local.stream
+        if not stream or not stream.unique_id:
+            return
+        # check if new inverter or collector infos are available or when the
+        #  home assistant has changed the status back to online
+        try:
+            if (('inverter' in stream.new_data and stream.new_data['inverter'])
+                    or ('collector' in stream.new_data and
+                        stream.new_data['collector'])
+                    or self.mqtt.ha_restarts != self.__ha_restarts):
+                await self._register_proxy_stat_home_assistant()
+                await self.__register_home_assistant(stream)
+                self.__ha_restarts = self.mqtt.ha_restarts
+
+            for key in stream.new_data:
+                await self.__async_publ_mqtt_packet(stream, key)
+            for key in Infos.new_stat_data:
+                await Proxy._async_publ_mqtt_proxy_stat(key)
+
+        except MqttCodeError as error:
+            logging.error(f'Mqtt except: {error}')
+        except Exception:
+            Infos.inc_counter('SW_Exception')
+            logging.error(
+                f"Inverter: Exception:\n"
+                f"{traceback.format_exc()}")
+
+    async def __async_publ_mqtt_packet(self, stream, key):
+        db = stream.db.db
+        if key in db and stream.new_data[key]:
+            data_json = json.dumps(db[key])
+            node_id = stream.node_id
+            logger_mqtt.debug(f'{key}: {data_json}')
+            await self.mqtt.publish(f'{self.entity_prfx}{node_id}{key}', data_json)  # noqa: E501
+            stream.new_data[key] = False
+
+    async def __register_home_assistant(self, stream) -> None:
+        '''register all our topics at home assistant'''
+        for data_json, component, node_id, id in stream.db.ha_confs(
+                self.entity_prfx, stream.node_id, stream.unique_id,
+                stream.sug_area):
+            logger_mqtt.debug(f"MQTT Register: cmp:'{component}'"
+                              f" node_id:'{node_id}' {data_json}")
+            await self.mqtt.publish(f"{self.discovery_prfx}{component}"
+                                    f"/{node_id}{id}/config", data_json)
+
+        stream.db.reg_clr_at_midnight(f'{self.entity_prfx}{stream.node_id}')
--- a/app/src/inverter_ifc.py
+++ b/app/src/inverter_ifc.py
@@ -0,0 +1,40 @@
+from abc import abstractmethod
+import logging
+from asyncio import StreamReader, StreamWriter
+
+if __name__ == "app.src.inverter_ifc":
+    from app.src.iter_registry import AbstractIterMeta
+else:  # pragma: no cover
+    from iter_registry import AbstractIterMeta
+
+logger_mqtt = logging.getLogger('mqtt')
+
+
+class InverterIfc(metaclass=AbstractIterMeta):
+    _registry = []
+
+    @abstractmethod
+    def __init__(self, reader: StreamReader, writer: StreamWriter,
+                 config_id: str, prot_class,
+                 client_mode: bool):
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def __enter__(self):
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def __exit__(self, exc_type, exc, tb):
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def healthy(self) -> bool:
+        pass  # pragma: no cover
+
+    @abstractmethod
+    async def disc(self, shutdown_started=False) -> None:
+        pass  # pragma: no cover
+
+    @abstractmethod
+    async def create_remote(self) -> None:
+        pass  # pragma: no cover
--- a/app/src/iter_registry.py
+++ b/app/src/iter_registry.py
@@ -0,0 +1,9 @@
+from abc import ABCMeta
+
+
+class AbstractIterMeta(ABCMeta):
+    def __iter__(cls):
+        for ref in cls._registry:
+            obj = ref()
+            if obj is not None:
+                yield obj
--- a/app/src/messages.py
+++ b/app/src/messages.py
@@ -1,15 +1,21 @@
 import logging
 import weakref
-from typing import Callable, Generator
+from typing import Callable
 from enum import Enum


 if __name__ == "app.src.messages":
+    from app.src.async_ifc import AsyncIfc
+    from app.src.protocol_ifc import ProtocolIfc
    from app.src.infos import Infos, Register
    from app.src.modbus import Modbus
+    from app.src.my_timer import Timer
 else:  # pragma: no cover
+    from async_ifc import AsyncIfc
+    from protocol_ifc import ProtocolIfc
    from infos import Infos, Register
    from modbus import Modbus
+    from my_timer import Timer

 logger = logging.getLogger('msg')

@@ -33,13 +39,9 @@ def __asc_val(n, data, data_len):
    return line


-def hex_dump_memory(level, info, data, data_len):
+def hex_dump(data, data_len) -> list:
    n = 0
    lines = []
-    lines.append(info)
-    tracer = logging.getLogger('tracer')
-    if not tracer.isEnabledFor(level):
-        return

    for i in range(0, data_len, 16):
        line = '  '
@@ -50,17 +52,26 @@ def hex_dump_memory(level, info, data, data_len):
        line += __asc_val(n, data, data_len)
        lines.append(line)

+    return lines
+
+
+def hex_dump_str(data, data_len):
+    lines = hex_dump(data, data_len)
+    return '\n'.join(lines)
+
+
+def hex_dump_memory(level, info, data, data_len):
+    lines = []
+    lines.append(info)
+    tracer = logging.getLogger('tracer')
+    if not tracer.isEnabledFor(level):
+        return
+
+    lines += hex_dump(data, data_len)
+
    tracer.log(level, '\n'.join(lines))


-class IterRegistry(type):
-    def __iter__(cls) -> Generator['Message', None, None]:
-        for ref in cls._registry:
-            obj = ref()
-            if obj is not None:
-                yield obj
-
-
 class State(Enum):
    '''state of the logical connection'''
    init = 0
@@ -75,31 +86,54 @@ class State(Enum):
    '''connection closed'''


-class Message(metaclass=IterRegistry):
-    _registry = []
+class Message(ProtocolIfc):
+    MAX_START_TIME = 400
+    '''maximum time without a received msg in sec'''
+    MAX_INV_IDLE_TIME = 120
+    '''maximum time without a received msg from the inverter in sec'''
+    MAX_DEF_IDLE_TIME = 360
+    '''maximum default time without a received msg in sec'''
+    MB_START_TIMEOUT = 40
+    '''start delay for Modbus polling in server mode'''
+    MB_REGULAR_TIMEOUT = 20
+    '''regular Modbus polling time in server mode'''

-    def __init__(self, server_side: bool, send_modbus_cb:
-                 Callable[[bytes, int, str], None], mb_timeout: int):
+    def __init__(self, node_id, ifc: "AsyncIfc", server_side: bool,
+                 send_modbus_cb: Callable[[bytes, int, str], None],
+                 mb_timeout: int):
        self._registry.append(weakref.ref(self))

        self.server_side = server_side
+        self.ifc = ifc
+        self.node_id = node_id
        if server_side:
            self.mb = Modbus(send_modbus_cb, mb_timeout)
+            self.mb_timer = Timer(self.mb_timout_cb, self.node_id)
        else:
            self.mb = None
-
+            self.mb_timer = None
        self.header_valid = False
        self.header_len = 0
        self.data_len = 0
        self.unique_id = 0
-        self.node_id = ''  # will be overwritten in the child class's __init__
        self.sug_area = ''
-        self._recv_buffer = bytearray(0)
-        self._send_buffer = bytearray(0)
-        self._forward_buffer = bytearray(0)
        self.new_data = {}
        self.state = State.init
        self.shutdown_started = False
+        self.modbus_elms = 0    # for unit tests
+        self.mb_timeout = self.MB_REGULAR_TIMEOUT
+        self.mb_first_timeout = self.MB_START_TIMEOUT
+        '''timer value for next Modbus polling request'''
+        self.modbus_polling = False
+
+    @property
+    def node_id(self):
+        return self._node_id
+
+    @node_id.setter
+    def node_id(self, value):
+        self._node_id = value
+        self.ifc.set_node_id(value)

    '''
    Empty methods, that have to be implemented in any child class which
@@ -109,10 +143,6 @@ class Message(metaclass=IterRegistry):
        # to our _recv_buffer
        return  # pragma: no cover

-    def _update_header(self, _forward_buffer):
-        '''callback for updating the header of the forward buffer'''
-        pass  # pragma: no cover
-
    def _set_mqtt_timestamp(self, key, ts: float | None):
        if key not in self.new_data or \
           not self.new_data[key]:
@@ -128,10 +158,45 @@ class Message(metaclass=IterRegistry):
            # logger.info(f'update: key: {key} ts:{tstr}'
            self.db.set_db_def_value(info_id, round(ts))

+    def _timeout(self) -> int:
+        if self.state == State.init or self.state == State.received:
+            to = self.MAX_START_TIME
+        elif self.state == State.up and \
+                self.server_side and self.modbus_polling:
+            to = self.MAX_INV_IDLE_TIME
+        else:
+            to = self.MAX_DEF_IDLE_TIME
+        return to
+
+    def _send_modbus_cmd(self, mb_no, func, addr, val, log_lvl) -> None:
+        if self.state != State.up:
+            logger.log(log_lvl, f'[{self.node_id}] ignore MODBUS cmd,'
+                       ' as the state is not UP')
+            return
+        self.mb.build_msg(mb_no, func, addr, val, log_lvl)
+
+    async def send_modbus_cmd(self, func, addr, val, log_lvl) -> None:
+        self._send_modbus_cmd(Modbus.INV_ADDR, func, addr, val, log_lvl)
+
    '''
    Our puplic methods
    '''
    def close(self) -> None:
+        if self.server_side:
+            # set inverter state to offline, if output power is very low
+            logging.debug('close power: '
+                          f'{self.db.get_db_value(Register.OUTPUT_POWER, -1)}')
+            if self.db.get_db_value(Register.OUTPUT_POWER, 999) < 2:
+                self.db.set_db_def_value(Register.INVERTER_STATUS, 0)
+                self.new_data['env'] = True
+            self.mb_timer.close()
+        self.state = State.closed
+        self.ifc.rx_set_cb(None)
+        self.ifc.prot_set_timeout_cb(None)
+        self.ifc.prot_set_init_new_client_conn_cb(None)
+        self.ifc.prot_set_update_header_cb(None)
+        self.ifc = None
+
        if self.mb:
            self.mb.close()
            self.mb = None
--- a/app/src/modbus.py
+++ b/app/src/modbus.py
@@ -17,9 +17,9 @@ import asyncio
 from typing import Generator, Callable

 if __name__ == "app.src.modbus":
-    from app.src.infos import Register
+    from app.src.infos import Register, Fmt
 else:  # pragma: no cover
-    from infos import Register
+    from infos import Register, Fmt

 logger = logging.getLogger('data')

@@ -40,15 +40,30 @@ class Modbus():

    __crc_tab = []
    mb_reg_mapping = {
+        0x2000: {'reg': Register.BOOT_STATUS,          'fmt': '!H'},                 # noqa: E501
+        0x2001: {'reg': Register.DSP_STATUS,           'fmt': '!H'},                 # noqa: E501
+        0x2003: {'reg': Register.WORK_MODE,            'fmt': '!H'},
+        0x2006: {'reg': Register.OUTPUT_SHUTDOWN,      'fmt': '!H'},
        0x2007: {'reg': Register.MAX_DESIGNED_POWER,   'fmt': '!H', 'ratio':  1},  # noqa: E501
+        0x2008: {'reg': Register.RATED_LEVEL,          'fmt': '!H'},
+        0x2009: {'reg': Register.INPUT_COEFFICIENT,    'fmt': '!H', 'ratio':  100/1024},  # noqa: E501
+        0x200a: {'reg': Register.GRID_VOLT_CAL_COEF,   'fmt': '!H'},
+
        0x202c: {'reg': Register.OUTPUT_COEFFICIENT,   'fmt': '!H', 'ratio':  100/1024},  # noqa: E501

        0x3000: {'reg': Register.INVERTER_STATUS,      'fmt': '!H'},                 # noqa: E501
-        0x3008: {'reg': Register.VERSION,              'fmt': '!H', 'eval': "f'V{(result>>12)}.{(result>>8)&0xf}.{(result>>4)&0xf}{result&0xf:1X}'"},  # noqa: E501
+        0x3001: {'reg': Register.DETECT_STATUS_1,      'fmt': '!H'},                 # noqa: E501
+        0x3002: {'reg': Register.DETECT_STATUS_2,      'fmt': '!H'},                 # noqa: E501
+        0x3003: {'reg': Register.EVENT_ALARM,          'fmt': '!H'},                 # noqa: E501
+        0x3004: {'reg': Register.EVENT_FAULT,          'fmt': '!H'},                 # noqa: E501
+        0x3005: {'reg': Register.EVENT_BF1,            'fmt': '!H'},                 # noqa: E501
+        0x3006: {'reg': Register.EVENT_BF2,            'fmt': '!H'},                 # noqa: E501
+
+        0x3008: {'reg': Register.VERSION,              'fmt': '!H', 'func': Fmt.version},  # noqa: E501
        0x3009: {'reg': Register.GRID_VOLTAGE,         'fmt': '!H', 'ratio':  0.1},  # noqa: E501
        0x300a: {'reg': Register.GRID_CURRENT,         'fmt': '!H', 'ratio': 0.01},  # noqa: E501
        0x300b: {'reg': Register.GRID_FREQUENCY,       'fmt': '!H', 'ratio': 0.01},  # noqa: E501
-        0x300c: {'reg': Register.INVERTER_TEMP,        'fmt': '!H', 'eval': 'result-40'},  # noqa: E501
+        0x300c: {'reg': Register.INVERTER_TEMP,        'fmt': '!H', 'offset': -40},  # noqa: E501
        # 0x300d
        0x300e: {'reg': Register.RATED_POWER,          'fmt': '!H', 'ratio':    1},  # noqa: E501
        0x300f: {'reg': Register.OUTPUT_POWER,         'fmt': '!H', 'ratio':  0.1},  # noqa: E501
@@ -74,6 +89,7 @@ class Modbus():
        0x3026: {'reg': Register.PV3_TOTAL_GENERATION, 'fmt': '!L', 'ratio': 0.01},  # noqa: E501
        0x3028: {'reg': Register.PV4_DAILY_GENERATION, 'fmt': '!H', 'ratio': 0.01},  # noqa: E501
        0x3029: {'reg': Register.PV4_TOTAL_GENERATION, 'fmt': '!L', 'ratio': 0.01},  # noqa: E501
+        # 0x302a
    }

    def __init__(self, snd_handler: Callable[[bytes, int, str], None],
@@ -87,8 +103,8 @@ class Modbus():
        '''Response handler to forward the response'''
        self.timeout = timeout
        '''MODBUS response timeout in seconds'''
-        self.max_retries = 1
-        '''Max retransmit for MODBUS requests'''
+        self.max_retries = 0
+        '''Max retransmit for MODBU requests'''
        self.retry_cnt = 0
        self.last_req = b''
        self.counter = {}
@@ -117,9 +133,8 @@ class Modbus():
        while not self.que.empty():
            self.que.get_nowait()

-    def __del__(self):
-        """log statistics on the deleting of a MODBUS instance"""
-        logging.debug(f'Modbus __del__:\n {self.counter}')
+    def set_node_id(self, node_id: str):
+        self.node_id = node_id

    def build_msg(self, addr: int, func: int, reg: int, val: int,
                  log_lvl=logging.DEBUG) -> None:
@@ -164,14 +179,13 @@ class Modbus():

        return True

-    def recv_resp(self, info_db, buf: bytes, node_id: str) -> \
+    def recv_resp(self, info_db, buf: bytes) -> \
            Generator[tuple[str, bool, int | float | str], None, None]:
        """Generator which check and parse a received MODBUS response.

        Keyword arguments:
            info_db: database for info lockups
            buf: received Modbus RTU response frame
-            node_id: string for logging which identifies the slave

        Returns on error and set Self.err to:
            1: CRC error
@@ -181,7 +195,6 @@ class Modbus():
            5: No MODBUS request pending
        """
        # logging.info(f'recv_resp: first byte modbus:{buf[0]} len:{len(buf)}')
-        self.node_id = node_id

        fcode = buf[1]
        data_available = self.last_addr == self.INV_ADDR and \
@@ -232,17 +245,6 @@ class Modbus():

        return False

-    def __get_value(self, buf: bytes, idx: int, row: dict):
-        '''get a value from the received buffer'''
-        val = struct.unpack_from(row['fmt'], buf, idx)
-        result = val[0]
-
-        if 'eval' in row:
-            result = eval(row['eval'])
-        if 'ratio' in row:
-            result = round(result * row['ratio'], 2)
-        return result
-
    def __process_data(self, info_db, buf: bytes, first_reg, elmlen):
        '''Generator over received registers, updates the db'''
        for i in range(0, elmlen):
@@ -252,7 +254,7 @@ class Modbus():
                info_id = row['reg']
                keys, level, unit, must_incr = info_db._key_obj(info_id)
                if keys:
-                    result = self.__get_value(buf, 3+2*i, row)
+                    result = Fmt.get_value(buf, 3+2*i, row)
                    name, update = info_db.update_db(keys, must_incr,
                                                     result)
                    yield keys[0], update, result
--- a/app/src/modbus_tcp.py
+++ b/app/src/modbus_tcp.py
@@ -5,9 +5,11 @@ import asyncio
 if __name__ == "app.src.modbus_tcp":
    from app.src.config import Config
    from app.src.gen3plus.inverter_g3p import InverterG3P
+    from app.src.infos import Infos
 else:  # pragma: no cover
    from config import Config
    from gen3plus.inverter_g3p import InverterG3P
+    from infos import Infos

 logger = logging.getLogger('conn')

@@ -17,23 +19,26 @@ class ModbusConn():
        self.host = host
        self.port = port
        self.addr = (host, port)
-        self.stream = None
+        self.inverter = None

    async def __aenter__(self) -> 'InverterG3P':
        '''Establish a client connection to the TSUN cloud'''
        connection = asyncio.open_connection(self.host, self.port)
        reader, writer = await connection
-        self.stream = InverterG3P(reader, writer, self.addr,
-                                  client_mode=True)
-        logging.info(f'[{self.stream.node_id}:{self.stream.conn_no}] '
+        self.inverter = InverterG3P(reader, writer,
+                                    client_mode=True)
+        self.inverter.__enter__()
+        stream = self.inverter.local.stream
+        logging.info(f'[{stream.node_id}:{stream.conn_no}] '
                     f'Connected to {self.addr}')
-        self.stream.inc_counter('Inverter_Cnt')
-        await self.stream.publish_outstanding_mqtt()
-        return self.stream
+        Infos.inc_counter('Inverter_Cnt')
+        await self.inverter.local.ifc.publish_outstanding_mqtt()
+        return self.inverter

    async def __aexit__(self, exc_type, exc, tb):
-        self.stream.dec_counter('Inverter_Cnt')
-        await self.stream.publish_outstanding_mqtt()
+        Infos.dec_counter('Inverter_Cnt')
+        await self.inverter.local.ifc.publish_outstanding_mqtt()
+        self.inverter.__exit__(exc_type, exc, tb)


 class ModbusTcp():
@@ -52,26 +57,30 @@ class ModbusTcp():
                # logging.info(f"SerialNo:{inv['monitor_sn']} host:{client['host']} port:{client['port']}")  # noqa: E501
                loop.create_task(self.modbus_loop(client['host'],
                                                  client['port'],
-                                                  inv['monitor_sn']))
+                                                  inv['monitor_sn'],
+                                                  client['forward']))

-    async def modbus_loop(self, host, port, snr: int) -> None:
+    async def modbus_loop(self, host, port,
+                          snr: int, forward: bool) -> None:
        '''Loop for receiving messages from the TSUN cloud (client-side)'''
        while True:
            try:
-                async with ModbusConn(host, port) as stream:
-                    await stream.send_start_cmd(snr, host)
-                    await stream.loop()
+                async with ModbusConn(host, port) as inverter:
+                    stream = inverter.local.stream
+                    await stream.send_start_cmd(snr, host, forward)
+                    await stream.ifc.loop()
                    logger.info(f'[{stream.node_id}:{stream.conn_no}] '
                                f'Connection closed - Shutdown: '
                                f'{stream.shutdown_started}')
                    if stream.shutdown_started:
                        return
+                del inverter  # decrease ref counter after the with block

            except (ConnectionRefusedError, TimeoutError) as error:
                logging.debug(f'Inv-conn:{error}')

            except OSError as error:
-                if error.errno == 113:
+                if error.errno == 113:  # pragma: no cover
                    logging.debug(f'os-error:{error}')
                else:
                    logging.info(f'os-error: {error}')
--- a/app/src/mqtt.py
+++ b/app/src/mqtt.py
@@ -44,9 +44,6 @@ class Mqtt(metaclass=Singleton):
    def ha_restarts(self, value):
        self._ha_restarts = value

-    def __del__(self):
-        logger_mqtt.debug('MQTT: __del__')
-
    async def close(self) -> None:
        logger_mqtt.debug('MQTT: close')
        self.task.cancel()
--- a/app/src/protocol_ifc.py
+++ b/app/src/protocol_ifc.py
@@ -0,0 +1,21 @@
+from abc import abstractmethod
+
+if __name__ == "app.src.protocol_ifc":
+    from app.src.iter_registry import AbstractIterMeta
+    from app.src.async_ifc import AsyncIfc
+else:  # pragma: no cover
+    from iter_registry import AbstractIterMeta
+    from async_ifc import AsyncIfc
+
+
+class ProtocolIfc(metaclass=AbstractIterMeta):
+    _registry = []
+
+    @abstractmethod
+    def __init__(self, addr, ifc: "AsyncIfc", server_side: bool,
+                 client_mode: bool = False, id_str=b''):
+        pass  # pragma: no cover
+
+    @abstractmethod
+    def close(self):
+        pass  # pragma: no cover
--- a/app/src/inverter.py
+++ b/app/src/inverter.py
@@ -1,7 +1,8 @@
 import asyncio
 import logging
 import json
-if __name__ == "app.src.inverter":
+
+if __name__ == "app.src.proxy":
    from app.src.config import Config
    from app.src.mqtt import Mqtt
    from app.src.infos import Infos
@@ -13,10 +14,32 @@ else:  # pragma: no cover
 logger_mqtt = logging.getLogger('mqtt')


-class Inverter():
+class Proxy():
+    '''class Proxy is a baseclass
+
+    The class has some class method for managing common resources like a
+    connection to the MQTT broker or proxy error counter which are common
+    for all inverter connection
+
+    Instances of the class are connections to an inverter and can have an
+    optional link to an remote connection to the TSUN cloud. A remote
+    connection dies with the inverter connection.
+
+    class methods:
+        class_init():  initialize the common resources of the proxy (MQTT
+                       broker, Proxy DB, etc). Must be called before the
+                       first inverter instance can be created
+        class_close(): release the common resources of the proxy. Should not
+                       be called before any instances of the class are
+                       destroyed
+
+    methods:
+        create_remote(): Establish a client connection to the TSUN cloud
+        async_publ_mqtt(): Publish data to MQTT broker
+    '''
    @classmethod
    def class_init(cls) -> None:
-        logging.debug('Inverter.class_init')
+        logging.debug('Proxy.class_init')
        # initialize the proxy statistics
        Infos.static_init()
        cls.db_stat = Infos()
@@ -38,7 +61,7 @@ class Inverter():
        # reset at midnight when you restart the proxy just before
        # midnight!
        inverters = Config.get('inverters')
-        # logger.debug(f'Inverters: {inverters}')
+        # logger.debug(f'Proxys: {inverters}')
        for inv in inverters.values():
            if (type(inv) is dict):
                node_id = inv['node_id']
@@ -77,7 +100,7 @@ class Inverter():

    @classmethod
    def class_close(cls, loop) -> None:   # pragma: no cover
-        logging.debug('Inverter.class_close')
+        logging.debug('Proxy.class_close')
        logging.info('Close MQTT Task')
        loop.run_until_complete(cls.mqtt.close())
        cls.mqtt = None
--- a/app/src/server.py
+++ b/app/src/server.py
@@ -5,8 +5,8 @@ import os
 from asyncio import StreamReader, StreamWriter
 from aiohttp import web
 from logging import config  # noqa F401
-from messages import Message
-from inverter import Inverter
+from proxy import Proxy
+from inverter_ifc import InverterIfc
 from gen3.inverter_g3 import InverterG3
 from gen3plus.inverter_g3p import InverterG3P
 from scheduler import Schedule
@@ -38,9 +38,9 @@ async def healthy(request):

    if proxy_is_up:
        # logging.info('web reqeust healthy()')
-        for stream in Message:
+        for inverter in InverterIfc:
            try:
-                res = stream.healthy()
+                res = inverter.healthy()
                if not res:
                    return web.Response(status=503, text="I have a problem")
            except Exception as err:
@@ -70,18 +70,11 @@ async def webserver(addr, port):
        logging.debug('HTTP cleanup done')


-async def handle_client(reader: StreamReader, writer: StreamWriter):
+async def handle_client(reader: StreamReader, writer: StreamWriter, inv_class):
    '''Handles a new incoming connection and starts an async loop'''

-    addr = writer.get_extra_info('peername')
-    await InverterG3(reader, writer, addr).server_loop(addr)
-
-
-async def handle_client_v2(reader: StreamReader, writer: StreamWriter):
-    '''Handles a new incoming connection and starts an async loop'''
-
-    addr = writer.get_extra_info('peername')
-    await InverterG3P(reader, writer, addr).server_loop(addr)
+    with inv_class(reader, writer) as inv:
+        await inv.local.ifc.server_loop()


 async def handle_shutdown(web_task):
@@ -94,25 +87,13 @@ async def handle_shutdown(web_task):
    #
    # first, disc all open TCP connections gracefully
    #
-    for stream in Message:
-        stream.shutdown_started = True
-        try:
-            await asyncio.wait_for(stream.disc(), 2)
-        except Exception:
-            pass
+    for inverter in InverterIfc:
+        await inverter.disc(True)
+
    logging.info('Proxy disconnecting done')

    #
-    # second, close all open TCP connections
-    #
-    for stream in Message:
-        stream.close()
-
-    await asyncio.sleep(0.1)  # give time for closing
-    logging.info('Proxy closing done')
-
-    #
-    # third, cancel the web server
+    # second, cancel the web server
    #
    web_task.cancel()
    await web_task
@@ -171,17 +152,19 @@ if __name__ == "__main__":
    ConfigErr = Config.class_init()
    if ConfigErr is not None:
        logging.info(f'ConfigErr: {ConfigErr}')
-    Inverter.class_init()
+    Proxy.class_init()
    Schedule.start()
-    mb_tcp = ModbusTcp(loop)
+    ModbusTcp(loop)

    #
    # Create tasks for our listening servers. These must be tasks! If we call
    # start_server directly out of our main task, the eventloop will be blocked
    # and we can't receive and handle the UNIX signals!
    #
-    loop.create_task(asyncio.start_server(handle_client, '0.0.0.0', 5005))
-    loop.create_task(asyncio.start_server(handle_client_v2, '0.0.0.0', 10000))
+    for inv_class, port in [(InverterG3, 5005), (InverterG3P, 10000)]:
+        loop.create_task(asyncio.start_server(lambda r, w, i=inv_class:
+                                              handle_client(r, w, i),
+                                              '0.0.0.0', port))
    web_task = loop.create_task(webserver('0.0.0.0', 8127))

    #
@@ -202,7 +185,7 @@ if __name__ == "__main__":
        pass
    finally:
        logging.info("Event loop is stopped")
-        Inverter.class_close(loop)
+        Proxy.class_close(loop)
        logging.debug('Close event loop')
        loop.close()
        logging.info(f'Finally, exit Server "{serv_name}"')
--- a/app/tests/test_async_stream.py
+++ b/app/tests/test_async_stream.py
@@ -0,0 +1,572 @@
+# test_with_pytest.py
+import pytest
+import asyncio
+import gc
+import time
+
+from app.src.infos import Infos
+from app.src.inverter_base import InverterBase
+from app.src.async_stream import AsyncStreamServer, AsyncStreamClient, StreamPtr
+from app.src.messages import Message
+from app.tests.test_modbus_tcp import FakeReader, FakeWriter
+from app.tests.test_inverter_base import config_conn, patch_open_connection
+
+pytest_plugins = ('pytest_asyncio',)
+
+# initialize the proxy statistics
+Infos.static_init()
+
+class FakeProto(Message):
+    def __init__(self, ifc, server_side):
+        super().__init__('G3F', ifc, server_side, None, 10)
+        self.conn_no = 0
+
+    def mb_timout_cb(self, exp_cnt):
+        pass  # empty callback
+
+def fake_reader_fwd():
+    reader = FakeReader()
+    reader.test  = FakeReader.RD_TEST_13_BYTES
+    reader.on_recv.set()
+    return reader
+
+def test_timeout_cb():
+    reader = FakeReader()
+    writer =  FakeWriter()
+    def timeout():
+        return 13
+    
+    ifc =  AsyncStreamClient(reader, writer, None, None)
+    assert 360 == ifc._AsyncStream__timeout()
+    ifc.prot_set_timeout_cb(timeout)
+    assert 13 == ifc._AsyncStream__timeout()
+    ifc.prot_set_timeout_cb(None)
+    assert 360 == ifc._AsyncStream__timeout()
+
+    # call healthy outside the contexter manager (__exit__() was called)
+    assert ifc.healthy()
+    del ifc
+
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+def test_health():
+    reader = FakeReader()
+    writer =  FakeWriter()
+    
+    ifc =  AsyncStreamClient(reader, writer, None, None)
+    ifc.proc_start = time.time()
+    assert ifc.healthy()
+    ifc.proc_start = time.time() -10
+    assert not ifc.healthy()
+    ifc.proc_start = None
+    assert ifc.healthy()
+
+    del ifc
+
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+@pytest.mark.asyncio
+async def test_close_cb():
+    assert asyncio.get_running_loop()
+    reader = FakeReader()
+    writer =  FakeWriter()
+    cnt = 0
+    def timeout():
+        return 0.1
+    def closed():
+        nonlocal cnt
+        nonlocal ifc
+        ifc.close()  # clears the closed callback
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamClient(reader, writer, None, closed)
+    ifc.prot_set_timeout_cb(timeout)
+    await ifc.client_loop('')
+    assert cnt == 1
+    ifc.prot_set_timeout_cb(timeout)
+    await ifc.client_loop('')
+    assert cnt == 1         # check that the closed method would not be called 
+    del ifc
+
+    cnt = 0
+    ifc =  AsyncStreamClient(reader, writer, None, None)
+    ifc.prot_set_timeout_cb(timeout)
+    await ifc.client_loop('')
+    assert cnt == 0
+    del ifc
+
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+@pytest.mark.asyncio
+async def test_read():
+    global test
+    assert asyncio.get_running_loop()
+    reader = FakeReader()
+    reader.test  = FakeReader.RD_TEST_13_BYTES
+    reader.on_recv.set()
+    writer =  FakeWriter()
+    cnt = 0
+    def timeout():
+        return 1
+    def closed():
+        nonlocal cnt
+        nonlocal ifc
+        ifc.close()  # clears the closed callback
+        cnt += 1
+    def app_read():
+        nonlocal ifc
+        ifc.proc_start -= 3
+        return 0.01  # async wait of 0.01 
+    cnt = 0
+    ifc =  AsyncStreamClient(reader, writer, None, closed)
+    ifc.proc_max = 0
+    ifc.prot_set_timeout_cb(timeout)
+    ifc.rx_set_cb(app_read)
+    await ifc.client_loop('')
+    print('End loop')
+    assert ifc.proc_max >= 3
+    assert 13 == ifc.rx_len()
+    assert cnt == 1
+    del ifc
+
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+@pytest.mark.asyncio
+async def test_write():
+    global test
+    assert asyncio.get_running_loop()
+    reader = FakeReader()
+    reader.test  = FakeReader.RD_TEST_13_BYTES
+    reader.on_recv.set()
+    writer =  FakeWriter()
+    cnt = 0
+    def timeout():
+        return 1
+    def closed():
+        nonlocal cnt
+        nonlocal ifc
+        ifc.close()  # clears the closed callback
+        cnt += 1
+    def app_read():
+        nonlocal ifc
+        ifc.proc_start -= 3
+        return 0.01  # async wait of 0.01 
+    
+    cnt = 0
+    ifc =  AsyncStreamClient(reader, writer, None, closed)
+    ifc.proc_max = 10
+    ifc.prot_set_timeout_cb(timeout)
+    ifc.rx_set_cb(app_read)
+    ifc.tx_add(b'test-data-resp')
+    assert 14 == ifc.tx_len()
+    await ifc.client_loop('')
+    print('End loop')
+    assert ifc.proc_max >= 3
+    assert 13 == ifc.rx_len()
+    assert 0 == ifc.tx_len()
+    assert cnt == 1
+    del ifc
+
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+@pytest.mark.asyncio
+async def test_publ_mqtt_cb():
+    assert asyncio.get_running_loop()
+    reader = FakeReader()
+    reader.test  = FakeReader.RD_TEST_13_BYTES
+    reader.on_recv.set()
+    writer =  FakeWriter()
+    cnt = 0
+    def timeout():
+        return 0.1
+    async def publ_mqtt():
+        nonlocal cnt
+        nonlocal ifc
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamServer(reader, writer, publ_mqtt, None, None)
+    assert ifc.async_publ_mqtt
+    ifc.prot_set_timeout_cb(timeout)
+    await ifc.server_loop()
+    assert cnt == 3     # 2 calls in server_loop() and 1 in loop()
+    assert ifc.async_publ_mqtt
+    ifc.close()  # clears the closed callback
+    assert not ifc.async_publ_mqtt
+    del ifc
+
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+@pytest.mark.asyncio
+async def test_create_remote_cb():
+    assert asyncio.get_running_loop()
+    reader = FakeReader()
+    writer =  FakeWriter()
+    cnt = 0
+    def timeout():
+        return 0.1
+    async def create_remote():
+        nonlocal cnt
+        nonlocal ifc
+        ifc.close()  # clears the closed callback
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamServer(reader, writer, None, create_remote, None)
+    assert ifc.create_remote
+    await ifc.create_remote()
+    assert cnt == 1
+    ifc.prot_set_timeout_cb(timeout)
+    await ifc.server_loop()
+    assert not ifc.create_remote
+    del ifc
+
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+@pytest.mark.asyncio
+async def test_sw_exception():
+    global test
+    assert asyncio.get_running_loop()
+    reader = FakeReader()
+    reader.test  = FakeReader.RD_TEST_SW_EXCEPT
+    reader.on_recv.set()
+    writer =  FakeWriter()
+    cnt = 0
+    def timeout():
+        return 1
+    def closed():
+        nonlocal cnt
+        nonlocal ifc
+        ifc.close()  # clears the closed callback
+        cnt += 1
+    cnt = 0
+    ifc =  AsyncStreamClient(reader, writer, None, closed)
+    ifc.prot_set_timeout_cb(timeout)
+    await ifc.client_loop('')
+    print('End loop')
+    assert cnt == 1
+    del ifc
+
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+@pytest.mark.asyncio
+async def test_os_error():
+    global test
+    assert asyncio.get_running_loop()
+    reader = FakeReader()
+    reader.test  = FakeReader.RD_TEST_OS_ERROR
+
+    reader.on_recv.set()
+    writer =  FakeWriter()
+    cnt = 0
+    def timeout():
+        return 1
+    def closed():
+        nonlocal cnt
+        nonlocal ifc
+        ifc.close()  # clears the closed callback
+        cnt += 1
+    cnt = 0
+    ifc =  AsyncStreamClient(reader, writer, None, closed)
+    ifc.prot_set_timeout_cb(timeout)
+    await ifc.client_loop('')
+    print('End loop')
+    assert cnt == 1
+    del ifc
+
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+class TestType():
+    FWD_NO_EXCPT = 1
+    FWD_SW_EXCPT = 2
+    FWD_TIMEOUT = 3
+    FWD_OS_ERROR = 4
+    FWD_OS_ERROR_NO_STREAM = 5
+    FWD_RUNTIME_ERROR = 6
+    FWD_RUNTIME_ERROR_NO_STREAM = 7
+
+def create_remote(remote, test_type, with_close_hdr:bool = False):
+    def update_hdr(buf):
+        return
+    def callback():
+        if test_type == TestType.FWD_SW_EXCPT:
+            remote.unknown_var += 1    
+        elif test_type == TestType.FWD_TIMEOUT:
+            raise TimeoutError
+        elif test_type == TestType.FWD_OS_ERROR:
+            raise ConnectionRefusedError
+        elif test_type == TestType.FWD_OS_ERROR_NO_STREAM:
+            remote.stream = None
+            raise ConnectionRefusedError
+        elif test_type == TestType.FWD_RUNTIME_ERROR:
+            raise RuntimeError("Peer closed")
+        elif test_type == TestType.FWD_RUNTIME_ERROR_NO_STREAM:
+            remote.stream = None
+            raise RuntimeError("Peer closed")
+        return True
+
+    def close():
+        return
+    if with_close_hdr:
+        close_hndl = close
+    else:
+        close_hndl = None
+    
+    remote.ifc = AsyncStreamClient(
+        FakeReader(), FakeWriter(), StreamPtr(None), close_hndl)
+    remote.ifc.prot_set_update_header_cb(update_hdr)
+    remote.ifc.prot_set_init_new_client_conn_cb(callback)
+    remote.stream = FakeProto(remote.ifc, False)
+
+@pytest.mark.asyncio
+async def test_forward():
+    assert asyncio.get_running_loop()
+    remote = StreamPtr(None)
+    cnt = 0
+
+    async def _create_remote():
+        nonlocal cnt, remote, ifc
+        create_remote(remote, TestType.FWD_NO_EXCPT)
+        ifc.fwd_add(b'test-forward_msg2 ')
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamServer(fake_reader_fwd(), FakeWriter(), None, _create_remote, remote)
+    ifc.fwd_add(b'test-forward_msg')
+    await ifc.server_loop()
+    assert cnt == 1
+    del ifc
+
+@pytest.mark.asyncio
+async def test_forward_with_conn():
+    assert asyncio.get_running_loop()
+    remote = StreamPtr(None)
+    cnt = 0
+
+    async def _create_remote():
+        nonlocal cnt, remote, ifc
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamServer(fake_reader_fwd(), FakeWriter(), None, _create_remote, remote)
+    create_remote(remote, TestType.FWD_NO_EXCPT)
+    ifc.fwd_add(b'test-forward_msg')
+    await ifc.server_loop()
+    assert cnt == 0
+    del ifc
+
+@pytest.mark.asyncio
+async def test_forward_no_conn():
+    assert asyncio.get_running_loop()
+    remote = StreamPtr(None)
+    cnt = 0
+
+    async def _create_remote():
+        nonlocal cnt
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamServer(fake_reader_fwd(), FakeWriter(), None, _create_remote, remote)
+    ifc.fwd_add(b'test-forward_msg')
+    await ifc.server_loop()
+    assert cnt == 1
+    del ifc
+
+@pytest.mark.asyncio
+async def test_forward_sw_except():
+    assert asyncio.get_running_loop()
+    remote = StreamPtr(None)
+    cnt = 0
+
+    async def _create_remote():
+        nonlocal cnt, remote
+        create_remote(remote, TestType.FWD_SW_EXCPT)
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamServer(fake_reader_fwd(), FakeWriter(), None, _create_remote, remote)
+    ifc.fwd_add(b'test-forward_msg')
+    await ifc.server_loop()
+    assert cnt == 1
+    del ifc
+
+@pytest.mark.asyncio
+async def test_forward_os_error():
+    assert asyncio.get_running_loop()
+    remote = StreamPtr(None)
+    cnt = 0
+
+    async def _create_remote():
+        nonlocal cnt, remote
+        create_remote(remote, TestType.FWD_OS_ERROR)
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamServer(fake_reader_fwd(), FakeWriter(), None, _create_remote, remote)
+    ifc.fwd_add(b'test-forward_msg')
+    await ifc.server_loop()
+    assert cnt == 1
+    del ifc
+
+@pytest.mark.asyncio
+async def test_forward_os_error2():
+    assert asyncio.get_running_loop()
+    remote = StreamPtr(None)
+    cnt = 0
+
+    async def _create_remote():
+        nonlocal cnt, remote
+        create_remote(remote, TestType.FWD_OS_ERROR, True)
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamServer(fake_reader_fwd(), FakeWriter(), None, _create_remote, remote)
+    ifc.fwd_add(b'test-forward_msg')
+    await ifc.server_loop()
+    assert cnt == 1
+    del ifc
+
+@pytest.mark.asyncio
+async def test_forward_os_error3():
+    assert asyncio.get_running_loop()
+    remote = StreamPtr(None)
+    cnt = 0
+
+    async def _create_remote():
+        nonlocal cnt, remote
+        create_remote(remote, TestType.FWD_OS_ERROR_NO_STREAM)
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamServer(fake_reader_fwd(), FakeWriter(), None, _create_remote, remote)
+    ifc.fwd_add(b'test-forward_msg')
+    await ifc.server_loop()
+    assert cnt == 1
+    del ifc
+
+@pytest.mark.asyncio
+async def test_forward_runtime_error():
+    assert asyncio.get_running_loop()
+    remote = StreamPtr(None)
+    cnt = 0
+
+    async def _create_remote():
+        nonlocal cnt, remote
+        create_remote(remote, TestType.FWD_RUNTIME_ERROR)
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamServer(fake_reader_fwd(), FakeWriter(), None, _create_remote, remote)
+    ifc.fwd_add(b'test-forward_msg')
+    await ifc.server_loop()
+    assert cnt == 1
+    del ifc
+
+@pytest.mark.asyncio
+async def test_forward_runtime_error2():
+    assert asyncio.get_running_loop()
+    remote = StreamPtr(None)
+    cnt = 0
+
+    async def _create_remote():
+        nonlocal cnt, remote
+        create_remote(remote, TestType.FWD_RUNTIME_ERROR, True)
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamServer(fake_reader_fwd(), FakeWriter(), None, _create_remote, remote)
+    ifc.fwd_add(b'test-forward_msg')
+    await ifc.server_loop()
+    assert cnt == 1
+    del ifc
+
+@pytest.mark.asyncio
+async def test_forward_runtime_error3():
+    assert asyncio.get_running_loop()
+    remote = StreamPtr(None)
+    cnt = 0
+
+    async def _create_remote():
+        nonlocal cnt, remote
+        create_remote(remote, TestType.FWD_RUNTIME_ERROR_NO_STREAM, True)
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamServer(fake_reader_fwd(), FakeWriter(), None, _create_remote, remote)
+    ifc.fwd_add(b'test-forward_msg')
+    await ifc.server_loop()
+    assert cnt == 1
+    del ifc
+
+@pytest.mark.asyncio
+async def test_forward_resp():
+    assert asyncio.get_running_loop()
+    remote = StreamPtr(None)
+    cnt = 0
+
+    async def _close_cb():
+        nonlocal cnt, remote, ifc
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamClient(fake_reader_fwd(), FakeWriter(), remote, _close_cb)
+    create_remote(remote, TestType.FWD_NO_EXCPT)
+    ifc.fwd_add(b'test-forward_msg')
+    await ifc.client_loop('')
+    assert cnt == 0
+    del ifc
+
+@pytest.mark.asyncio
+async def test_forward_resp2():
+    assert asyncio.get_running_loop()
+    remote = StreamPtr(None)
+    cnt = 0
+
+    async def _close_cb():
+        nonlocal cnt, remote, ifc
+        cnt += 1
+    
+    cnt = 0
+    ifc =  AsyncStreamClient(fake_reader_fwd(), FakeWriter(), None, _close_cb)
+    create_remote(remote, TestType.FWD_NO_EXCPT)
+    ifc.fwd_add(b'test-forward_msg')
+    await ifc.client_loop('')
+    assert cnt == 0
+    del ifc
--- a/app/tests/test_byte_fifo.py
+++ b/app/tests/test_byte_fifo.py
@@ -0,0 +1,43 @@
+# test_with_pytest.py
+
+from app.src.byte_fifo import ByteFifo
+
+def test_fifo():
+    read = ByteFifo()
+    assert 0 == len(read)
+    read += b'12'
+    assert 2 == len(read)
+    read += bytearray("34", encoding='UTF8')
+    assert 4 == len(read)
+    assert b'12' == read.peek(2)
+    assert 4 == len(read)
+    assert b'1234' == read.peek()
+    assert 4 == len(read)
+    assert b'12' == read.get(2)
+    assert 2 == len(read)
+    assert b'34' == read.get()
+    assert 0 == len(read)
+
+def test_fifo_fmt():
+    read = ByteFifo()
+    read += b'1234'
+    assert b'1234' == read.peek()
+    assert "  0000 | 31 32 33 34                                      | 1234" == f'{read}'
+
+def test_fifo_observer():
+    read = ByteFifo()
+
+    def _read():
+        assert b'1234' == read.get(4)
+
+    read += b'12'
+    assert 2 == len(read)
+    read()
+    read.reg_trigger(_read)
+    read += b'34'
+    assert 4 == len(read)
+    read()
+    assert 0 == len(read)
+    assert b'' == read.peek(2)
+    assert b'' == read.get(2)
+    assert 0 == len(read)
--- a/app/tests/test_config.py
+++ b/app/tests/test_config.py
@@ -30,7 +30,33 @@ def test_default_config():
        validated = Config.conf_schema.validate(cnf)
    except Exception:
        assert False
-    assert validated == {'gen3plus': {'at_acl': {'mqtt': {'allow': ['AT+'], 'block': []}, 'tsun': {'allow': ['AT+Z', 'AT+UPURL', 'AT+SUPDATE'], 'block': []}}}, 'tsun': {'enabled': True, 'host': 'logger.talent-monitoring.com', 'port': 5005}, 'solarman': {'enabled': True, 'host': 'iot.talent-monitoring.com', 'port': 10000}, 'mqtt': {'host': 'mqtt', 'port': 1883, 'user': None, 'passwd': None}, 'ha': {'auto_conf_prefix': 'homeassistant', 'discovery_prefix': 'homeassistant', 'entity_prefix': 'tsun', 'proxy_node_id': 'proxy', 'proxy_unique_id': 'P170000000000001'}, 'inverters': {'allow_all': True, 'R170000000000001': {'node_id': '', 'modbus_polling': False, 'monitor_sn': 0, 'suggested_area': '', 'sensor_list': 688}, 'Y170000000000001': {'modbus_polling': True, 'monitor_sn': 2000000000, 'node_id': '', 'suggested_area': '', 'sensor_list': 688}}}
+    assert validated == {'gen3plus': {'at_acl': {'mqtt': {'allow': ['AT+'], 'block': []}, 'tsun': {'allow': ['AT+Z', 'AT+UPURL', 'AT+SUPDATE'], 'block': []}}}, 'tsun': {'enabled': True, 'host': 'logger.talent-monitoring.com', 'port': 5005}, 'solarman': {'enabled': True, 'host': 'iot.talent-monitoring.com', 'port': 10000}, 'mqtt': {'host': 'mqtt', 'port': 1883, 'user': None, 'passwd': None}, 'ha': {'auto_conf_prefix': 'homeassistant', 'discovery_prefix': 'homeassistant', 'entity_prefix': 'tsun', 'proxy_node_id': 'proxy', 'proxy_unique_id': 'P170000000000001'},
+                         'inverters': {
+                             'allow_all': False, 
+                             'R170000000000001': {
+                                 'node_id': '', 
+                                 'pv1': {'manufacturer': 'Risen',
+                                         'type': 'RSM40-8-395M'},
+                                 'pv2': {'manufacturer': 'Risen',
+                                         'type': 'RSM40-8-395M'},
+                                 'modbus_polling': False,
+                                 'monitor_sn': 0, 
+                                 'suggested_area': '', 
+                                 'sensor_list': 688}, 
+                             'Y170000000000001': {
+                                 'modbus_polling': True, 
+                                 'monitor_sn': 2000000000, 
+                                 'node_id': '',
+                                 'pv1': {'manufacturer': 'Risen',
+                                         'type': 'RSM40-8-410M'},
+                                 'pv2': {'manufacturer': 'Risen',
+                                         'type': 'RSM40-8-410M'},
+                                 'pv3': {'manufacturer': 'Risen',
+                                         'type': 'RSM40-8-410M'},
+                                 'pv4': {'manufacturer': 'Risen',
+                                         'type': 'RSM40-8-410M'},
+                                 'suggested_area': '', 
+                                 'sensor_list': 688}}}

 def test_full_config():
    cnf = {'tsun': {'enabled': True, 'host': 'logger.talent-monitoring.com', 'port': 5005}, 
@@ -71,7 +97,37 @@ def test_read_empty():
    err = TstConfig.read('app/config/')
    assert err == None
    cnf = TstConfig.get()
-    assert cnf == {'gen3plus': {'at_acl': {'mqtt': {'allow': ['AT+'], 'block': []}, 'tsun': {'allow': ['AT+Z', 'AT+UPURL', 'AT+SUPDATE'], 'block': []}}}, 'tsun': {'enabled': True, 'host': 'logger.talent-monitoring.com', 'port': 5005}, 'solarman': {'enabled': True, 'host': 'iot.talent-monitoring.com', 'port': 10000}, 'mqtt': {'host': 'mqtt', 'port': 1883, 'user': None, 'passwd': None}, 'ha': {'auto_conf_prefix': 'homeassistant', 'discovery_prefix': 'homeassistant', 'entity_prefix': 'tsun', 'proxy_node_id': 'proxy', 'proxy_unique_id': 'P170000000000001'}, 'inverters': {'allow_all': True, 'R170000000000001': {'suggested_area': '', 'modbus_polling': False, 'monitor_sn': 0, 'node_id': '', 'sensor_list': 688}, 'Y170000000000001': {'modbus_polling': True, 'monitor_sn': 2000000000, 'suggested_area': '', 'node_id': '', 'sensor_list': 688}}}
+    assert cnf == {'gen3plus': {'at_acl': {'mqtt': {'allow': ['AT+'], 'block': []}, 'tsun': {'allow': ['AT+Z', 'AT+UPURL', 'AT+SUPDATE'], 'block': []}}}, 'tsun': {'enabled': True, 'host': 'logger.talent-monitoring.com', 'port': 5005}, 'solarman': {'enabled': True, 'host': 'iot.talent-monitoring.com', 'port': 10000}, 'mqtt': {'host': 'mqtt', 'port': 1883, 'user': None, 'passwd': None}, 'ha': {'auto_conf_prefix': 'homeassistant', 'discovery_prefix': 'homeassistant', 'entity_prefix': 'tsun', 'proxy_node_id': 'proxy', 'proxy_unique_id': 'P170000000000001'},
+                   'inverters': {
+                       'allow_all': False,
+                       'R170000000000001': {
+                           'suggested_area': '', 
+                           'modbus_polling': False, 
+                           'monitor_sn': 0, 
+                           'node_id': '', 
+                           'pv1': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-395M'},
+                           'pv2': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-395M'},
+                           'sensor_list': 688
+                       }, 
+                       'Y170000000000001': {
+                           'modbus_polling': True, 
+                           'monitor_sn': 2000000000, 
+                           'suggested_area': '', 
+                           'node_id': '', 
+                           'pv1': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'pv2': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'pv3': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'pv4': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'sensor_list': 688
+                       }
+                    }
+                  }
    
    defcnf = TstConfig.def_config.get('solarman') 
    assert defcnf == {'enabled': True, 'host': 'iot.talent-monitoring.com', 'port': 10000}
@@ -93,7 +149,37 @@ def test_read_cnf1():
    err = TstConfig.read('app/config/')
    assert err == None
    cnf = TstConfig.get()
-    assert cnf == {'gen3plus': {'at_acl': {'mqtt': {'allow': ['AT+'], 'block': []}, 'tsun': {'allow': ['AT+Z', 'AT+UPURL', 'AT+SUPDATE'], 'block': []}}}, 'tsun': {'enabled': True, 'host': 'logger.talent-monitoring.com', 'port': 5005}, 'solarman': {'enabled': False, 'host': 'iot.talent-monitoring.com', 'port': 10000}, 'mqtt': {'host': 'mqtt', 'port': 1883, 'user': None, 'passwd': None}, 'ha': {'auto_conf_prefix': 'homeassistant', 'discovery_prefix': 'homeassistant', 'entity_prefix': 'tsun', 'proxy_node_id': 'proxy', 'proxy_unique_id': 'P170000000000001'}, 'inverters': {'allow_all': True, 'R170000000000001': {'suggested_area': '', 'modbus_polling': False, 'monitor_sn': 0, 'node_id': '', 'sensor_list': 688}, 'Y170000000000001': {'modbus_polling': True, 'monitor_sn': 2000000000, 'suggested_area': '', 'node_id': '', 'sensor_list': 688}}}
+    assert cnf == {'gen3plus': {'at_acl': {'mqtt': {'allow': ['AT+'], 'block': []}, 'tsun': {'allow': ['AT+Z', 'AT+UPURL', 'AT+SUPDATE'], 'block': []}}}, 'tsun': {'enabled': True, 'host': 'logger.talent-monitoring.com', 'port': 5005}, 'solarman': {'enabled': False, 'host': 'iot.talent-monitoring.com', 'port': 10000}, 'mqtt': {'host': 'mqtt', 'port': 1883, 'user': None, 'passwd': None}, 'ha': {'auto_conf_prefix': 'homeassistant', 'discovery_prefix': 'homeassistant', 'entity_prefix': 'tsun', 'proxy_node_id': 'proxy', 'proxy_unique_id': 'P170000000000001'},
+                   'inverters': {
+                       'allow_all': False,
+                       'R170000000000001': {
+                           'suggested_area': '', 
+                           'modbus_polling': False, 
+                           'monitor_sn': 0, 
+                           'node_id': '', 
+                           'pv1': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-395M'},
+                           'pv2': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-395M'},
+                           'sensor_list': 688
+                       }, 
+                       'Y170000000000001': {
+                           'modbus_polling': True, 
+                           'monitor_sn': 2000000000, 
+                           'suggested_area': '', 
+                           'node_id': '', 
+                           'pv1': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'pv2': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'pv3': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'pv4': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'sensor_list': 688
+                       }
+                    }
+                  }
    cnf = TstConfig.get('solarman')
    assert cnf == {'enabled': False, 'host': 'iot.talent-monitoring.com', 'port': 10000}    
    defcnf = TstConfig.def_config.get('solarman') 
@@ -106,7 +192,37 @@ def test_read_cnf2():
    err = TstConfig.read('app/config/')
    assert err == None
    cnf = TstConfig.get()
-    assert cnf == {'gen3plus': {'at_acl': {'mqtt': {'allow': ['AT+'], 'block': []}, 'tsun': {'allow': ['AT+Z', 'AT+UPURL', 'AT+SUPDATE'], 'block': []}}}, 'tsun': {'enabled': True, 'host': 'logger.talent-monitoring.com', 'port': 5005}, 'solarman': {'enabled': True, 'host': 'iot.talent-monitoring.com', 'port': 10000}, 'mqtt': {'host': 'mqtt', 'port': 1883, 'user': None, 'passwd': None}, 'ha': {'auto_conf_prefix': 'homeassistant', 'discovery_prefix': 'homeassistant', 'entity_prefix': 'tsun', 'proxy_node_id': 'proxy', 'proxy_unique_id': 'P170000000000001'}, 'inverters': {'allow_all': True, 'R170000000000001': {'suggested_area': '', 'modbus_polling': False, 'monitor_sn': 0, 'node_id': '', 'sensor_list': 688}, 'Y170000000000001': {'modbus_polling': True, 'monitor_sn': 2000000000, 'suggested_area': '', 'node_id': '', 'sensor_list': 688}}}
+    assert cnf == {'gen3plus': {'at_acl': {'mqtt': {'allow': ['AT+'], 'block': []}, 'tsun': {'allow': ['AT+Z', 'AT+UPURL', 'AT+SUPDATE'], 'block': []}}}, 'tsun': {'enabled': True, 'host': 'logger.talent-monitoring.com', 'port': 5005}, 'solarman': {'enabled': True, 'host': 'iot.talent-monitoring.com', 'port': 10000}, 'mqtt': {'host': 'mqtt', 'port': 1883, 'user': None, 'passwd': None}, 'ha': {'auto_conf_prefix': 'homeassistant', 'discovery_prefix': 'homeassistant', 'entity_prefix': 'tsun', 'proxy_node_id': 'proxy', 'proxy_unique_id': 'P170000000000001'},
+                   'inverters': {
+                       'allow_all': False,
+                       'R170000000000001': {
+                           'suggested_area': '', 
+                           'modbus_polling': False, 
+                           'monitor_sn': 0, 
+                           'node_id': '', 
+                           'pv1': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-395M'},
+                           'pv2': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-395M'},
+                           'sensor_list': 688
+                       }, 
+                       'Y170000000000001': {
+                           'modbus_polling': True, 
+                           'monitor_sn': 2000000000, 
+                           'suggested_area': '', 
+                           'node_id': '', 
+                           'pv1': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'pv2': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'pv3': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'pv4': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'sensor_list': 688
+                       }
+                    }
+                  }
    assert True == TstConfig.is_default('solarman')

 def test_read_cnf3():
@@ -123,7 +239,37 @@ def test_read_cnf4():
    err = TstConfig.read('app/config/')
    assert err == None
    cnf = TstConfig.get()
-    assert cnf == {'gen3plus': {'at_acl': {'mqtt': {'allow': ['AT+'], 'block': []}, 'tsun': {'allow': ['AT+Z', 'AT+UPURL', 'AT+SUPDATE'], 'block': []}}}, 'tsun': {'enabled': True, 'host': 'logger.talent-monitoring.com', 'port': 5005}, 'solarman': {'enabled': True, 'host': 'iot.talent-monitoring.com', 'port': 5000}, 'mqtt': {'host': 'mqtt', 'port': 1883, 'user': None, 'passwd': None}, 'ha': {'auto_conf_prefix': 'homeassistant', 'discovery_prefix': 'homeassistant', 'entity_prefix': 'tsun', 'proxy_node_id': 'proxy', 'proxy_unique_id': 'P170000000000001'}, 'inverters': {'allow_all': True, 'R170000000000001': {'suggested_area': '', 'modbus_polling': False, 'monitor_sn': 0, 'node_id': '', 'sensor_list': 688}, 'Y170000000000001': {'modbus_polling': True, 'monitor_sn': 2000000000, 'suggested_area': '', 'node_id': '', 'sensor_list': 688}}}
+    assert cnf == {'gen3plus': {'at_acl': {'mqtt': {'allow': ['AT+'], 'block': []}, 'tsun': {'allow': ['AT+Z', 'AT+UPURL', 'AT+SUPDATE'], 'block': []}}}, 'tsun': {'enabled': True, 'host': 'logger.talent-monitoring.com', 'port': 5005}, 'solarman': {'enabled': True, 'host': 'iot.talent-monitoring.com', 'port': 5000}, 'mqtt': {'host': 'mqtt', 'port': 1883, 'user': None, 'passwd': None}, 'ha': {'auto_conf_prefix': 'homeassistant', 'discovery_prefix': 'homeassistant', 'entity_prefix': 'tsun', 'proxy_node_id': 'proxy', 'proxy_unique_id': 'P170000000000001'},
+                   'inverters': {
+                       'allow_all': False,
+                       'R170000000000001': {
+                           'suggested_area': '', 
+                           'modbus_polling': False, 
+                           'monitor_sn': 0, 
+                           'node_id': '', 
+                           'pv1': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-395M'},
+                           'pv2': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-395M'},
+                           'sensor_list': 688
+                       }, 
+                       'Y170000000000001': {
+                           'modbus_polling': True, 
+                           'monitor_sn': 2000000000, 
+                           'suggested_area': '', 
+                           'node_id': '', 
+                           'pv1': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'pv2': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'pv3': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'pv4': {'manufacturer': 'Risen',
+                                   'type': 'RSM40-8-410M'},
+                           'sensor_list': 688
+                       }
+                    }
+                  }
    assert False == TstConfig.is_default('solarman')

 def test_read_cnf5():
--- a/app/tests/test_infos.py
+++ b/app/tests/test_infos.py
@@ -3,7 +3,7 @@ import pytest
 import json, math
 import logging
 from app.src.infos import Register, ClrAtMidnight
-from app.src.infos import Infos
+from app.src.infos import Infos, Fmt

 def test_statistic_counter():
    i = Infos()
@@ -17,13 +17,13 @@ def test_statistic_counter():
    assert val == None or val == 0

    i.static_init()                # initialize counter
-    assert json.dumps(i.stat) == json.dumps({"proxy": {"Inverter_Cnt": 0, "Unknown_SNR": 0, "Unknown_Msg": 0, "Invalid_Data_Type": 0, "Internal_Error": 0,"Unknown_Ctrl": 0, "OTA_Start_Msg": 0, "SW_Exception": 0, "Invalid_Msg_Format": 0, "AT_Command": 0, "AT_Command_Blocked": 0, "Modbus_Command": 0}})
+    assert json.dumps(i.stat) == json.dumps({"proxy": {"Inverter_Cnt": 0, "Cloud_Conn_Cnt": 0, "Unknown_SNR": 0, "Unknown_Msg": 0, "Invalid_Data_Type": 0, "Internal_Error": 0,"Unknown_Ctrl": 0, "OTA_Start_Msg": 0, "SW_Exception": 0, "Invalid_Msg_Format": 0, "AT_Command": 0, "AT_Command_Blocked": 0, "Modbus_Command": 0}})
                                            
    val = i.dev_value(Register.INVERTER_CNT)  # valid and initiliazed addr
    assert val == 0

    i.inc_counter('Inverter_Cnt')
-    assert json.dumps(i.stat) == json.dumps({"proxy": {"Inverter_Cnt": 1, "Unknown_SNR": 0, "Unknown_Msg": 0, "Invalid_Data_Type": 0, "Internal_Error": 0,"Unknown_Ctrl": 0, "OTA_Start_Msg": 0, "SW_Exception": 0, "Invalid_Msg_Format": 0, "AT_Command": 0, "AT_Command_Blocked": 0, "Modbus_Command": 0}})
+    assert json.dumps(i.stat) == json.dumps({"proxy": {"Inverter_Cnt": 1, "Cloud_Conn_Cnt": 0, "Unknown_SNR": 0, "Unknown_Msg": 0, "Invalid_Data_Type": 0, "Internal_Error": 0,"Unknown_Ctrl": 0, "OTA_Start_Msg": 0, "SW_Exception": 0, "Invalid_Msg_Format": 0, "AT_Command": 0, "AT_Command_Blocked": 0, "Modbus_Command": 0}})
    val = i.dev_value(Register.INVERTER_CNT)
    assert val == 1

@@ -256,3 +256,24 @@ def test_key_obj():
    assert level == logging.DEBUG
    assert unit == 'kWh'
    assert must_incr == True
+
+def test_hex4_cnv():
+    tst_val = (0x12ef, )
+    string = Fmt.hex4(tst_val)
+    assert string == '12ef'
+    val = Fmt.hex4(string, reverse=True)
+    assert val == tst_val[0]
+
+def test_mac_cnv():
+    tst_val = (0x12, 0x34,  0x67, 0x89, 0xcd, 0xef)
+    string = Fmt.mac(tst_val)
+    assert string == '12:34:67:89:cd:ef'
+    val = Fmt.mac(string, reverse=True)
+    assert val == tst_val
+
+def test_version_cnv():
+    tst_val = (0x123f, )
+    string = Fmt.version(tst_val)
+    assert string == 'V1.2.3F'
+    val = Fmt.version(string, reverse=True)
+    assert val == tst_val[0]
--- a/app/tests/test_infos_g3.py
+++ b/app/tests/test_infos_g3.py
@@ -1,7 +1,7 @@
 # test_with_pytest.py
-import pytest, json
-from app.src.infos import Register, ClrAtMidnight
-from app.src.gen3.infos_g3 import InfosG3
+import pytest, json, math
+from app.src.infos import Register
+from app.src.gen3.infos_g3 import InfosG3, RegisterMap

@pytest.fixture
 def contr_data_seq(): # Get Time Request message
@@ -421,21 +421,21 @@ def test_must_incr_total(inv_data_seq2, inv_data_seq2_zero):
        if key == 'total' or key == 'inverter' or key == 'env':
            assert update == True
            tests +=1   
-    assert tests==5
+    assert tests==12
    assert json.dumps(i.db['total']) == json.dumps({'Daily_Generation': 1.7, 'Total_Generation': 17.36})
    assert json.dumps(i.db['input']) == json.dumps({"pv1": {"Voltage": 33.6, "Current": 1.91, "Power": 64.5, "Daily_Generation": 1.08, "Total_Generation": 9.74}, "pv2": {"Voltage": 33.5, "Current": 1.36, "Power": 45.7, "Daily_Generation": 0.62, "Total_Generation": 7.62}, "pv3": {"Voltage": 0.0, "Current": 0.0, "Power": 0.0}, "pv4": {"Voltage": 0.0, "Current": 0.0, "Power": 0.0}})
-    assert json.dumps(i.db['env']) == json.dumps({"Inverter_Temp": 23})
+    assert json.dumps(i.db['env']) == json.dumps({"Inverter_Status": 1, "Inverter_Temp": 23})
    tests = 0
    for key, update in i.parse (inv_data_seq2):
        if key == 'total' or key == 'env':
            assert update == False
            tests +=1   

-    assert tests==3
+    assert tests==4
    assert json.dumps(i.db['total']) == json.dumps({'Daily_Generation': 1.7, 'Total_Generation': 17.36})
    assert json.dumps(i.db['input']) == json.dumps({"pv1": {"Voltage": 33.6, "Current": 1.91, "Power": 64.5, "Daily_Generation": 1.08, "Total_Generation": 9.74}, "pv2": {"Voltage": 33.5, "Current": 1.36, "Power": 45.7, "Daily_Generation": 0.62, "Total_Generation": 7.62}, "pv3": {"Voltage": 0.0, "Current": 0.0, "Power": 0.0}, "pv4": {"Voltage": 0.0, "Current": 0.0, "Power": 0.0}})
-    assert json.dumps(i.db['env']) == json.dumps({"Inverter_Temp": 23})
-    assert json.dumps(i.db['inverter']) == json.dumps({"Rated_Power": 600, "No_Inputs": 2})
+    assert json.dumps(i.db['env']) == json.dumps({"Inverter_Status": 1, "Inverter_Temp": 23})
+    assert json.dumps(i.db['inverter']) == json.dumps({"Rated_Power": 600, "BOOT_STATUS": 0, "DSP_STATUS": 21930, "Work_Mode": 0, "Max_Designed_Power": -1, "Input_Coefficient": -0.1, "Output_Coefficient": 100.0, "No_Inputs": 2})
        
    tests = 0
    for key, update in i.parse (inv_data_seq2_zero):
@@ -443,13 +443,12 @@ def test_must_incr_total(inv_data_seq2, inv_data_seq2_zero):
            assert update == False
            tests +=1   
        elif key == 'env':
-            assert update == True
            tests +=1   

-    assert tests==3
+    assert tests==4
    assert json.dumps(i.db['total']) == json.dumps({'Daily_Generation': 1.7, 'Total_Generation': 17.36})
    assert json.dumps(i.db['input']) == json.dumps({"pv1": {"Voltage": 33.6, "Current": 1.91, "Power": 0.0, "Daily_Generation": 1.08, "Total_Generation": 9.74}, "pv2": {"Voltage": 33.5, "Current": 1.36, "Power": 0.0, "Daily_Generation": 0.62, "Total_Generation": 7.62}, "pv3": {"Voltage": 0.0, "Current": 0.0, "Power": 0.0}, "pv4": {"Voltage": 0.0, "Current": 0.0, "Power": 0.0}})
-    assert json.dumps(i.db['env']) == json.dumps({"Inverter_Temp": 0})
+    assert json.dumps(i.db['env']) == json.dumps({"Inverter_Status": 1, "Inverter_Temp": 0})

 def test_must_incr_total2(inv_data_seq2, inv_data_seq2_zero):
    i = InfosG3()
@@ -462,10 +461,10 @@ def test_must_incr_total2(inv_data_seq2, inv_data_seq2_zero):
            assert update == True
            tests +=1

-    assert tests==3
+    assert tests==4
    assert json.dumps(i.db['total']) == json.dumps({})
    assert json.dumps(i.db['input']) == json.dumps({"pv1": {"Voltage": 33.6, "Current": 1.91, "Power": 0.0}, "pv2": {"Voltage": 33.5, "Current": 1.36, "Power": 0.0}, "pv3": {"Voltage": 0.0, "Current": 0.0, "Power": 0.0}, "pv4": {"Voltage": 0.0, "Current": 0.0, "Power": 0.0}})
-    assert json.dumps(i.db['env']) == json.dumps({"Inverter_Temp": 0})
+    assert json.dumps(i.db['env']) == json.dumps({"Inverter_Status": 1, "Inverter_Temp": 0})
    
    tests = 0
    for key, update in i.parse (inv_data_seq2_zero):
@@ -473,18 +472,17 @@ def test_must_incr_total2(inv_data_seq2, inv_data_seq2_zero):
            assert update == False
            tests +=1   

-    assert tests==3
+    assert tests==4
    assert json.dumps(i.db['total']) == json.dumps({})
    assert json.dumps(i.db['input']) == json.dumps({"pv1": {"Voltage": 33.6, "Current": 1.91, "Power": 0.0}, "pv2": {"Voltage": 33.5, "Current": 1.36, "Power": 0.0}, "pv3": {"Voltage": 0.0, "Current": 0.0, "Power": 0.0}, "pv4": {"Voltage": 0.0, "Current": 0.0, "Power": 0.0}})
-    assert json.dumps(i.db['env']) == json.dumps({"Inverter_Temp": 0})
+    assert json.dumps(i.db['env']) == json.dumps({"Inverter_Status": 1, "Inverter_Temp": 0})

    tests = 0
    for key, update in i.parse (inv_data_seq2):
        if key == 'total' or key == 'env':
-            assert update == True
            tests +=1   

-    assert tests==3
+    assert tests==4
    assert json.dumps(i.db['total']) == json.dumps({'Daily_Generation': 1.7, 'Total_Generation': 17.36})
    assert json.dumps(i.db['input']) == json.dumps({"pv1": {"Voltage": 33.6, "Current": 1.91, "Power": 64.5, "Daily_Generation": 1.08, "Total_Generation": 9.74}, "pv2": {"Voltage": 33.5, "Current": 1.36, "Power": 45.7, "Daily_Generation": 0.62, "Total_Generation": 7.62}, "pv3": {"Voltage": 0.0, "Current": 0.0, "Power": 0.0}, "pv4": {"Voltage": 0.0, "Current": 0.0, "Power": 0.0}})
   
@@ -503,10 +501,10 @@ def test_new_data_types(inv_data_new):
        else:
            assert False

-    assert tests==15
-    assert json.dumps(i.db['inverter']) == json.dumps({"Manufacturer": 0})
+    assert tests==7
+    assert json.dumps(i.db['inverter']) == json.dumps({"Manufacturer": 0, "DSP_STATUS": 0})
    assert json.dumps(i.db['input']) == json.dumps({"pv1": {}})
-    assert json.dumps(i.db['events']) == json.dumps({"401_": 0, "404_": 0, "405_": 0, "408_": 0, "409_No_Utility": 0, "406_": 0, "416_": 0})
+    assert json.dumps(i.db['events']) == json.dumps({"Inverter_Alarm": 0, "Inverter_Fault": 0})

 def test_invalid_data_type(invalid_data_seq):
    i = InfosG3()
--- a/app/tests/test_infos_g3p.py
+++ b/app/tests/test_infos_g3p.py
@@ -57,6 +57,7 @@ def inverter_data():  # 0x4210 ftype: 0x01
    msg += b'\x01\x61\x00\xa8\x02\x54\x01\x5a\x00\x8a\x01\xe4\x01\x5a\x00\xbd'
    msg += b'\x02\x8f\x00\x11\x00\x01\x00\x00\x00\x0b\x00\x00\x27\x98\x00\x04'
    msg += b'\x00\x00\x0c\x04\x00\x03\x00\x00\x0a\xe7\x00\x05\x00\x00\x0c\x75'
+    
    msg += b'\x00\x00\x00\x00\x06\x16\x02\x00\x00\x00\x55\xaa\x00\x01\x00\x00'
    msg += b'\x00\x00\x00\x00\xff\xff\x07\xd0\x00\x03\x04\x00\x04\x00\x04\x00'
    msg += b'\x04\x00\x00\x01\xff\xff\x00\x01\x00\x06\x00\x68\x00\x68\x05\x00'
@@ -85,10 +86,21 @@ def test_parse_4110(str_test_ip, device_data: bytes):
        pass  # side effect is calling generator i.parse()

    assert json.dumps(i.db) == json.dumps({
-        'controller': {"Data_Up_Interval": 300, "Collect_Interval": 1, "Heartbeat_Interval": 120, "Signal_Strength": 100, "IP_Address": str_test_ip, "Sensor_List": "02b0"},
-        'collector': {"Chip_Model": "LSW5BLE_17_02B0_1.05", "Collector_Fw_Version": "V1.1.00.0B"},
+        'controller': {"Data_Up_Interval": 300, "Collect_Interval": 1, "Heartbeat_Interval": 120, "Signal_Strength": 100, "IP_Address": str_test_ip, "Sensor_List": "02b0", "WiFi_SSID": "Allius-Home"},
+        'collector': {"Chip_Model": "LSW5BLE_17_02B0_1.05", "MAC-Addr": "40:2a:8f:4f:51:54", "Collector_Fw_Version": "V1.1.00.0B"},
        })

+def test_build_4110(str_test_ip, device_data: bytes):
+    i = InfosG3P(client_mode=False)
+    i.db.clear()
+    for key, update in i.parse (device_data, 0x41, 2):
+        pass  # side effect is calling generator i.parse()
+
+    build_msg = i.build(len(device_data), 0x41, 2)
+    for i in range(11, 20):
+        build_msg[i] = device_data[i]
+    assert device_data == build_msg    
+
 def test_parse_4210(inverter_data: bytes):
    i = InfosG3P(client_mode=False)
    i.db.clear()
@@ -98,16 +110,31 @@ def test_parse_4210(inverter_data: bytes):

    assert json.dumps(i.db) == json.dumps({
         "controller": {"Sensor_List": "02b0", "Power_On_Time": 2051}, 
-         "inverter": {"Serial_Number": "Y17E00000000000E", "Version": "V4.0.10", "Rated_Power": 600, "Max_Designed_Power": 2000}, 
-         "env": {"Inverter_Status": 1, "Inverter_Temp": 14}, 
+         "inverter": {"Serial_Number": "Y17E00000000000E", "Version": "V4.0.10", "Rated_Power": 600, "BOOT_STATUS": 0, "DSP_STATUS": 21930, "Work_Mode": 0, "Max_Designed_Power": 2000, "Input_Coefficient": 100.0, "Output_Coefficient": 100.0}, 
+         "env": {"Inverter_Status": 1, "Detect_Status_1": 2, "Detect_Status_2": 0, "Inverter_Temp": 14}, 
+         "events": {"Inverter_Alarm": 0, "Inverter_Fault": 0, "Inverter_Bitfield_1": 0, "Inverter_bitfield_2": 0},
         "grid": {"Voltage": 224.8, "Current": 0.73, "Frequency": 50.05, "Output_Power": 165.8}, 
         "input": {"pv1": {"Voltage": 35.3, "Current": 1.68, "Power": 59.6, "Daily_Generation": 0.04, "Total_Generation": 30.76}, 
                   "pv2": {"Voltage": 34.6, "Current": 1.38, "Power": 48.4, "Daily_Generation": 0.03, "Total_Generation": 27.91}, 
                   "pv3": {"Voltage": 34.6, "Current": 1.89, "Power": 65.5, "Daily_Generation": 0.05, "Total_Generation": 31.89}, 
                   "pv4": {"Voltage": 1.7, "Current": 0.01, "Power": 0.0, "Total_Generation": 15.58}}, 
-         "total": {"Daily_Generation": 0.11, "Total_Generation": 101.36}
+         "total": {"Daily_Generation": 0.11, "Total_Generation": 101.36},
+         "inv_unknown": {"Unknown_1": 512},
+         "other": {"Output_Shutdown": 65535, "Rated_Level": 3, "Grid_Volt_Cal_Coef": 1024}
        })
+
+def test_build_4210(inverter_data: bytes):
+    i = InfosG3P(client_mode=False)
+    i.db.clear()
    
+    for key, update in i.parse (inverter_data, 0x42, 1):
+        pass  #  side effect is calling generator i.parse()
+
+    build_msg = i.build(len(inverter_data), 0x42, 1)
+    for i in range(11, 31):
+        build_msg[i] = inverter_data[i]
+    assert inverter_data == build_msg    
+
 def test_build_ha_conf1():
    i = InfosG3P(client_mode=False)
    i.static_init()                # initialize counter
@@ -256,10 +283,12 @@ def test_build_ha_conf4():

    assert tests==1

-def test_exception_and_eval(inverter_data: bytes):
+def test_exception_and_calc(inverter_data: bytes):

-    # add eval to convert temperature from °F to °C
-    RegisterMap.map[0x420100d8]['eval'] =  '(result-32)/1.8'
+    # patch table to convert temperature from °F to °C
+    ofs =     RegisterMap.map[0x420100d8]['offset']
+    RegisterMap.map[0x420100d8]['quotient'] =  1.8
+    RegisterMap.map[0x420100d8]['offset'] =  -32/1.8
    # map PV1_VOLTAGE to invalid register  
    RegisterMap.map[0x420100e0]['reg'] = Register.TEST_REG2
    # set invalid maping entry for OUTPUT_POWER (string instead of dict type) 
@@ -267,16 +296,43 @@ def test_exception_and_eval(inverter_data: bytes):
    RegisterMap.map[0x420100de] = 'invalid_entry'

    i = InfosG3P(client_mode=False)
-    # i.db.clear()
+    i.db.clear()
    
    for key, update in i.parse (inverter_data, 0x42, 1):
        pass  #  side effect is calling generator i.parse()
    assert math.isclose(12.2222, round (i.get_db_value(Register.INVERTER_TEMP, 0),4), rel_tol=1e-09, abs_tol=1e-09)
-    del RegisterMap.map[0x420100d8]['eval'] # remove eval
-    RegisterMap.map[0x420100e0]['reg'] = Register.PV1_VOLTAGE # reset mapping
-    RegisterMap.map[0x420100de] = backup # reset mapping
+    
+    build_msg = i.build(len(inverter_data), 0x42, 1)
+    assert build_msg[32:0xde] == inverter_data[32:0xde]
+    assert build_msg[0xde:0xe2] == b'\x00\x00\x00\x00'
+    assert build_msg[0xe2:-1] == inverter_data[0xe2:-1]
+
+
+    # remove a table entry and test parsing and building
+    del RegisterMap.map[0x420100d8]['quotient']
+    del RegisterMap.map[0x420100d8]['offset']
+
+    i.db.clear()
    
    for key, update in i.parse (inverter_data, 0x42, 1):
        pass  #  side effect is calling generator i.parse()
    assert 54 == i.get_db_value(Register.INVERTER_TEMP, 0)
- 
+
+    build_msg = i.build(len(inverter_data), 0x42, 1)
+    assert build_msg[32:0xd8] == inverter_data[32:0xd8]
+    assert build_msg[0xd8:0xe2] == b'\x006\x00\x00\x02X\x00\x00\x00\x00'
+    assert build_msg[0xe2:-1] == inverter_data[0xe2:-1]
+
+    # test restore table 
+    RegisterMap.map[0x420100d8]['offset'] = ofs
+    RegisterMap.map[0x420100e0]['reg'] = Register.PV1_VOLTAGE # reset mapping
+    RegisterMap.map[0x420100de] = backup # reset mapping
+
+    # test orginial table 
+    i.db.clear()    
+    for key, update in i.parse (inverter_data, 0x42, 1):
+        pass  #  side effect is calling generator i.parse()
+    assert 14 == i.get_db_value(Register.INVERTER_TEMP, 0)
+
+    build_msg = i.build(len(inverter_data), 0x42, 1)
+    assert build_msg[32:-1] == inverter_data[32:-1]
--- a/app/tests/test_inverter_base.py
+++ b/app/tests/test_inverter_base.py
@@ -0,0 +1,304 @@
+# test_with_pytest.py
+import pytest
+import asyncio
+import gc
+
+from mock import patch
+from enum import Enum
+from app.src.infos import Infos
+from app.src.config import Config
+from app.src.gen3.talent import Talent
+from app.src.inverter_base import InverterBase
+from app.src.singleton import Singleton
+from app.src.async_stream import AsyncStream, AsyncStreamClient
+
+from app.tests.test_modbus_tcp import patch_mqtt_err, patch_mqtt_except, test_port, test_hostname
+
+pytest_plugins = ('pytest_asyncio',)
+
+# initialize the proxy statistics
+Infos.static_init()
+
+@pytest.fixture
+def config_conn():
+    Config.act_config = {
+        'mqtt':{
+            'host': test_hostname,
+            'port': test_port,
+            'user': '',
+            'passwd': ''
+        },
+        'ha':{
+            'auto_conf_prefix': 'homeassistant',
+            'discovery_prefix': 'homeassistant', 
+            'entity_prefix': 'tsun',
+            'proxy_node_id': 'test_1',
+            'proxy_unique_id': ''
+        },
+        'tsun':{'enabled': True, 'host': 'test_cloud.local', 'port': 1234}, 'inverters':{'allow_all':True}
+    }
+
+@pytest.fixture(scope="module", autouse=True)
+def module_init():
+    Singleton._instances.clear()
+    yield
+
+class FakeReader():
+    def __init__(self):
+        self.on_recv =  asyncio.Event()
+    async def read(self, max_len: int):
+        await self.on_recv.wait()
+        return b''
+    def feed_eof(self):
+        return
+
+
+class FakeWriter():
+    def write(self, buf: bytes):
+        return
+    def get_extra_info(self, sel: str):
+        if sel == 'peername':
+            return 'remote.intern'
+        elif sel == 'sockname':
+            return 'sock:1234'
+        assert False
+    def is_closing(self):
+        return False
+    def close(self):
+        return
+    async def wait_closed(self):
+        return
+
+class TestType(Enum):
+    RD_TEST_0_BYTES = 1
+    RD_TEST_TIMEOUT = 2
+    RD_TEST_EXCEPT = 3
+
+
+test  = TestType.RD_TEST_0_BYTES
+
+@pytest.fixture
+def patch_open_connection():
+    async def new_conn(conn):
+        await asyncio.sleep(0)
+        return FakeReader(), FakeWriter()
+    
+    def new_open(host: str, port: int):
+        global test
+        if test == TestType.RD_TEST_TIMEOUT:
+            raise ConnectionRefusedError
+        elif test == TestType.RD_TEST_EXCEPT:
+            raise ValueError("Value cannot be negative") # Compliant
+        return new_conn(None)
+
+    with patch.object(asyncio, 'open_connection', new_open) as conn:
+        yield conn
+
+
+@pytest.fixture
+def patch_healthy():
+    with patch.object(AsyncStream, 'healthy') as conn:
+        yield conn
+
+@pytest.fixture
+def patch_unhealthy():
+    def new_healthy(self):
+        return False
+    with patch.object(AsyncStream, 'healthy', new_healthy) as conn:
+        yield conn
+@pytest.fixture
+def patch_unhealthy_remote():
+    def new_healthy(self):
+        return False
+    with patch.object(AsyncStreamClient, 'healthy', new_healthy) as conn:
+        yield conn
+
+def test_inverter_iter():
+    InverterBase._registry.clear()
+    cnt = 0
+    reader = FakeReader()
+    writer =  FakeWriter()
+
+    with InverterBase(reader, writer, 'tsun', Talent) as inverter:
+        for inv in InverterBase:
+            assert inv == inverter
+            cnt += 1
+            del inv
+    del inverter
+    assert cnt == 1
+    
+    for inv in InverterBase:
+        assert False
+
+def test_method_calls(patch_healthy):
+    spy = patch_healthy
+    InverterBase._registry.clear()
+    reader = FakeReader()
+    writer =  FakeWriter()
+
+    with InverterBase(reader, writer, 'tsun', Talent) as inverter:
+        assert inverter.local.stream
+        assert inverter.local.ifc
+        # call healthy inside the contexter manager
+        for inv in InverterBase:
+            assert inv.healthy() 
+            del inv
+        spy.assert_called_once()
+
+    # outside context manager the health function of AsyncStream is not reachable
+    cnt = 0
+    for inv in InverterBase:
+        assert inv.healthy()
+        cnt += 1
+        del inv
+    assert cnt == 1
+    spy.assert_called_once() # counter don't increase and keep one!
+
+    del inverter
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+def test_unhealthy(patch_unhealthy):
+    _ = patch_unhealthy
+    InverterBase._registry.clear()
+    reader = FakeReader()
+    writer =  FakeWriter()
+
+    with InverterBase(reader, writer, 'tsun', Talent) as inverter:
+        assert inverter.local.stream
+        assert inverter.local.ifc
+        # call healthy inside the contexter manager
+        assert not inverter.healthy()
+
+    # outside context manager the unhealth AsyncStream is released
+    cnt = 0
+    for inv in InverterBase:
+        assert inv.healthy()  # inverter is healthy again (without the unhealty AsyncStream)
+        cnt += 1
+        del inv
+    assert cnt == 1
+
+    del inverter
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+def test_unhealthy_remote(patch_unhealthy_remote):
+    _ = patch_unhealthy
+    InverterBase._registry.clear()
+    reader = FakeReader()
+    writer =  FakeWriter()
+
+    with InverterBase(reader, writer, 'tsun', Talent) as inverter:
+        assert inverter.local.stream
+        assert inverter.local.ifc
+        # call healthy inside the contexter manager
+        assert not inverter.healthy()
+
+    # outside context manager the unhealth AsyncStream is released
+    cnt = 0
+    for inv in InverterBase:
+        assert inv.healthy()  # inverter is healthy again (without the unhealty AsyncStream)
+        cnt += 1
+        del inv
+    assert cnt == 1
+
+    del inverter
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+@pytest.mark.asyncio
+async def test_remote_conn(config_conn, patch_open_connection):
+    _ = config_conn
+    _ = patch_open_connection
+    assert asyncio.get_running_loop()
+    reader = FakeReader()
+    writer =  FakeWriter()
+
+    with InverterBase(reader, writer, 'tsun', Talent) as inverter:
+        await inverter.create_remote()
+        await asyncio.sleep(0)
+        assert inverter.remote.stream
+        assert inverter.remote.ifc
+        # call healthy inside the contexter manager
+        assert inverter.healthy()
+
+    # call healthy outside the contexter manager (__exit__() was called)
+    assert inverter.healthy()
+    del inverter
+
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+@pytest.mark.asyncio
+async def test_unhealthy_remote(config_conn, patch_open_connection, patch_unhealthy_remote):
+    _ = config_conn
+    _ = patch_open_connection
+    _ = patch_unhealthy_remote
+    assert asyncio.get_running_loop()
+    InverterBase._registry.clear()
+    reader = FakeReader()
+    writer =  FakeWriter()
+
+    with InverterBase(reader, writer, 'tsun', Talent) as inverter:
+        assert inverter.local.stream
+        assert inverter.local.ifc
+        await inverter.create_remote()
+        await asyncio.sleep(0)
+        assert inverter.remote.stream
+        assert inverter.remote.ifc
+        assert inverter.local.ifc.healthy()
+        assert not inverter.remote.ifc.healthy()
+        # call healthy inside the contexter manager
+        assert not inverter.healthy()
+
+    # outside context manager the unhealth AsyncStream is released
+    cnt = 0
+    for inv in InverterBase:
+        assert inv.healthy()  # inverter is healthy again (without the unhealty AsyncStream)
+        cnt += 1
+        del inv
+    assert cnt == 1
+
+    del inverter
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+@pytest.mark.asyncio
+async def test_remote_disc(config_conn, patch_open_connection):
+    _ = config_conn
+    _ = patch_open_connection
+    assert asyncio.get_running_loop()
+    reader = FakeReader()
+    writer =  FakeWriter()
+
+    with InverterBase(reader, writer, 'tsun', Talent) as inverter:
+        await inverter.create_remote()
+        await asyncio.sleep(0)
+        assert inverter.remote.stream
+        # call disc inside the contexter manager
+        await inverter.disc()
+        
+    # call disc outside the contexter manager (__exit__() was called)
+    await inverter.disc()
+    del inverter
+
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
--- a/app/tests/test_inverter_g3.py
+++ b/app/tests/test_inverter_g3.py
@@ -0,0 +1,226 @@
+# test_with_pytest.py
+import pytest
+import asyncio
+import sys,gc
+
+from mock import patch
+from enum import Enum
+from app.src.infos import Infos
+from app.src.config import Config
+from app.src.proxy import Proxy
+from app.src.inverter_base import InverterBase
+from app.src.singleton import Singleton
+from app.src.gen3.inverter_g3 import InverterG3
+from app.src.async_stream import AsyncStream
+
+from app.tests.test_modbus_tcp import patch_mqtt_err, patch_mqtt_except, test_port, test_hostname
+
+pytest_plugins = ('pytest_asyncio',)
+
+# initialize the proxy statistics
+Infos.static_init()
+
+@pytest.fixture
+def config_conn():
+    Config.act_config = {
+        'mqtt':{
+            'host': test_hostname,
+            'port': test_port,
+            'user': '',
+            'passwd': ''
+        },
+        'ha':{
+            'auto_conf_prefix': 'homeassistant',
+            'discovery_prefix': 'homeassistant', 
+            'entity_prefix': 'tsun',
+            'proxy_node_id': 'test_1',
+            'proxy_unique_id': ''
+        },
+        'tsun':{'enabled': True, 'host': 'test_cloud.local', 'port': 1234}, 'inverters':{'allow_all':True}
+    }
+
+@pytest.fixture(scope="module", autouse=True)
+def module_init():
+    Singleton._instances.clear()
+    yield
+
+class FakeReader():
+    def __init__(self):
+        self.on_recv =  asyncio.Event()
+    async def read(self, max_len: int):
+        await self.on_recv.wait()
+        return b''
+    def feed_eof(self):
+        return
+
+
+class FakeWriter():
+    def write(self, buf: bytes):
+        return
+    def get_extra_info(self, sel: str):
+        if sel == 'peername':
+            return 'remote.intern'
+        elif sel == 'sockname':
+            return 'sock:1234'
+        assert False
+    def is_closing(self):
+        return False
+    def close(self):
+        return
+    async def wait_closed(self):
+        return
+
+class TestType(Enum):
+    RD_TEST_0_BYTES = 1
+    RD_TEST_TIMEOUT = 2
+    RD_TEST_EXCEPT = 3
+
+
+test  = TestType.RD_TEST_0_BYTES
+
+@pytest.fixture
+def patch_open_connection():
+    async def new_conn(conn):
+        await asyncio.sleep(0)
+        return FakeReader(), FakeWriter()
+    
+    def new_open(host: str, port: int):
+        global test
+        if test == TestType.RD_TEST_TIMEOUT:
+            raise ConnectionRefusedError
+        elif test == TestType.RD_TEST_EXCEPT:
+            raise ValueError("Value cannot be negative") # Compliant
+        return new_conn(None)
+
+    with patch.object(asyncio, 'open_connection', new_open) as conn:
+        yield conn
+
+@pytest.fixture
+def patch_healthy():
+    with patch.object(AsyncStream, 'healthy') as conn:
+        yield conn
+
+def test_method_calls(patch_healthy):
+    spy = patch_healthy
+    reader = FakeReader()
+    writer =  FakeWriter()
+    InverterBase._registry.clear()
+
+    with InverterG3(reader, writer) as inverter:
+        assert inverter.local.stream
+        assert inverter.local.ifc
+        for inv in InverterBase:
+            inv.healthy()
+            del inv
+        spy.assert_called_once()
+    del inverter
+    cnt = 0
+    for inv in InverterBase:
+        cnt += 1
+    assert cnt == 0
+
+@pytest.mark.asyncio
+async def test_remote_conn(config_conn, patch_open_connection):
+    _ = config_conn
+    _ = patch_open_connection
+    assert asyncio.get_running_loop()
+
+    with InverterG3(FakeReader(), FakeWriter()) as inverter:
+        await inverter.create_remote()
+        await asyncio.sleep(0)
+        assert inverter.remote.stream
+    del inverter
+
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+@pytest.mark.asyncio
+async def test_remote_except(config_conn, patch_open_connection):
+    _ = config_conn
+    _ = patch_open_connection
+    assert asyncio.get_running_loop()
+
+    global test
+    test  = TestType.RD_TEST_TIMEOUT
+
+    with InverterG3(FakeReader(), FakeWriter()) as inverter:
+        await inverter.create_remote()
+        await asyncio.sleep(0)
+        assert inverter.remote.stream==None
+
+        test  = TestType.RD_TEST_EXCEPT
+        await inverter.create_remote()
+        await asyncio.sleep(0)
+        assert inverter.remote.stream==None
+    del inverter
+
+    cnt = 0
+    for inv in InverterBase:
+        print(f'InverterBase refs:{gc.get_referrers(inv)}')
+        cnt += 1
+    assert cnt == 0
+
+@pytest.mark.asyncio
+async def test_mqtt_publish(config_conn, patch_open_connection):
+    _ = config_conn
+    _ = patch_open_connection
+    assert asyncio.get_running_loop()
+
+    Proxy.class_init()
+
+    with InverterG3(FakeReader(), FakeWriter()) as inverter:
+        stream = inverter.local.stream
+        await inverter.async_publ_mqtt()  # check call with invalid unique_id
+        stream._Talent__set_serial_no(serial_no= "123344")
+
+        stream.new_data['inverter'] = True
+        stream.db.db['inverter'] = {}
+        await inverter.async_publ_mqtt()
+        assert stream.new_data['inverter'] == False
+
+        stream.new_data['env'] = True
+        stream.db.db['env'] = {}
+        await inverter.async_publ_mqtt()
+        assert stream.new_data['env'] == False
+
+        Infos.new_stat_data['proxy'] = True
+        await inverter.async_publ_mqtt()
+        assert Infos.new_stat_data['proxy'] == False
+
+@pytest.mark.asyncio
+async def test_mqtt_err(config_conn, patch_open_connection, patch_mqtt_err):
+    _ = config_conn
+    _ = patch_open_connection
+    _ = patch_mqtt_err
+    assert asyncio.get_running_loop()
+
+    Proxy.class_init()
+
+    with InverterG3(FakeReader(), FakeWriter()) as inverter:
+        stream = inverter.local.stream
+        stream._Talent__set_serial_no(serial_no= "123344")
+        stream.new_data['inverter'] = True
+        stream.db.db['inverter'] = {}
+        await inverter.async_publ_mqtt()
+        assert stream.new_data['inverter'] == True
+
+@pytest.mark.asyncio
+async def test_mqtt_except(config_conn, patch_open_connection, patch_mqtt_except):
+    _ = config_conn
+    _ = patch_open_connection
+    _ = patch_mqtt_except
+    assert asyncio.get_running_loop()
+
+    Proxy.class_init()
+
+    with InverterG3(FakeReader(), FakeWriter()) as inverter:
+        stream = inverter.local.stream
+        stream._Talent__set_serial_no(serial_no= "123344")
+
+        stream.new_data['inverter'] = True
+        stream.db.db['inverter'] = {}
+        await inverter.async_publ_mqtt()
+        assert stream.new_data['inverter'] == True
--- a/app/tests/test_inverter_g3p.py
+++ b/app/tests/test_inverter_g3p.py
@@ -0,0 +1,196 @@
+# test_with_pytest.py
+import pytest
+import asyncio
+
+from mock import patch
+from enum import Enum
+from app.src.infos import Infos
+from app.src.config import Config
+from app.src.proxy import Proxy
+from app.src.inverter_base import InverterBase
+from app.src.singleton import Singleton
+from app.src.gen3plus.inverter_g3p import InverterG3P
+
+from app.tests.test_modbus_tcp import patch_mqtt_err, patch_mqtt_except, test_port, test_hostname
+
+
+pytest_plugins = ('pytest_asyncio',)
+
+# initialize the proxy statistics
+Infos.static_init()
+
+@pytest.fixture
+def config_conn():
+    Config.act_config = {
+        'mqtt':{
+            'host': test_hostname,
+            'port': test_port,
+            'user': '',
+            'passwd': ''
+        },
+        'ha':{
+            'auto_conf_prefix': 'homeassistant',
+            'discovery_prefix': 'homeassistant', 
+            'entity_prefix': 'tsun',
+            'proxy_node_id': 'test_1',
+            'proxy_unique_id': ''
+        },
+        'solarman':{'enabled': True, 'host': 'test_cloud.local', 'port': 1234}, 'inverters':{'allow_all':True}
+    }
+
+@pytest.fixture(scope="module", autouse=True)
+def module_init():
+    Singleton._instances.clear()
+    yield
+
+class FakeReader():
+    def __init__(self):
+        self.on_recv =  asyncio.Event()
+    async def read(self, max_len: int):
+        await self.on_recv.wait()
+        return b''
+    def feed_eof(self):
+        return
+
+
+class FakeWriter():
+    def write(self, buf: bytes):
+        return
+    def get_extra_info(self, sel: str):
+        if sel == 'peername':
+            return 'remote.intern'
+        elif sel == 'sockname':
+            return 'sock:1234'
+        assert False
+    def is_closing(self):
+        return False
+    def close(self):
+        return
+    async def wait_closed(self):
+        return
+
+class TestType(Enum):
+    RD_TEST_0_BYTES = 1
+    RD_TEST_TIMEOUT = 2
+    RD_TEST_EXCEPT = 3
+
+
+test  = TestType.RD_TEST_0_BYTES
+
+@pytest.fixture
+def patch_open_connection():
+    async def new_conn(conn):
+        await asyncio.sleep(0)
+        return FakeReader(), FakeWriter()
+    
+    def new_open(host: str, port: int):
+        global test
+        if test == TestType.RD_TEST_TIMEOUT:
+            raise ConnectionRefusedError
+        elif test == TestType.RD_TEST_EXCEPT:
+            raise ValueError("Value cannot be negative") # Compliant
+        return new_conn(None)
+
+    with patch.object(asyncio, 'open_connection', new_open) as conn:
+        yield conn
+
+def test_method_calls():
+    reader = FakeReader()
+    writer =  FakeWriter()
+    InverterBase._registry.clear()
+
+    with InverterG3P(reader, writer, client_mode=False) as inverter:
+        assert inverter.local.stream
+        assert inverter.local.ifc
+
+@pytest.mark.asyncio
+async def test_remote_conn(config_conn, patch_open_connection):
+    _ = config_conn
+    _ = patch_open_connection
+    assert asyncio.get_running_loop()
+
+    with InverterG3P(FakeReader(), FakeWriter(), client_mode=False) as inverter:
+        await inverter.create_remote()
+        await asyncio.sleep(0)
+        assert inverter.remote.stream
+
+@pytest.mark.asyncio
+async def test_remote_except(config_conn, patch_open_connection):
+    _ = config_conn
+    _ = patch_open_connection
+    assert asyncio.get_running_loop()
+    
+    global test
+    test  = TestType.RD_TEST_TIMEOUT
+
+    with InverterG3P(FakeReader(), FakeWriter(), client_mode=False) as inverter:
+        await inverter.create_remote()
+        await asyncio.sleep(0)
+        assert inverter.remote.stream==None
+
+        test  = TestType.RD_TEST_EXCEPT
+        await inverter.create_remote()
+        await asyncio.sleep(0)
+        assert inverter.remote.stream==None
+
+@pytest.mark.asyncio
+async def test_mqtt_publish(config_conn, patch_open_connection):
+    _ = config_conn
+    _ = patch_open_connection
+    assert asyncio.get_running_loop()
+
+    Proxy.class_init()
+
+    with InverterG3P(FakeReader(), FakeWriter(), client_mode=False) as inverter:
+        stream = inverter.local.stream
+        await inverter.async_publ_mqtt()  # check call with invalid unique_id   
+        stream._set_serial_no(snr= 123344)
+
+        stream.new_data['inverter'] = True
+        stream.db.db['inverter'] = {}
+        await inverter.async_publ_mqtt()
+        assert stream.new_data['inverter'] == False
+
+        stream.new_data['env'] = True
+        stream.db.db['env'] = {}
+        await inverter.async_publ_mqtt()
+        assert stream.new_data['env'] == False
+
+        Infos.new_stat_data['proxy'] = True
+        await inverter.async_publ_mqtt()
+        assert Infos.new_stat_data['proxy'] == False
+
+@pytest.mark.asyncio
+async def test_mqtt_err(config_conn, patch_open_connection, patch_mqtt_err):
+    _ = config_conn
+    _ = patch_open_connection
+    _ = patch_mqtt_err
+    assert asyncio.get_running_loop()
+
+    Proxy.class_init()
+
+    with InverterG3P(FakeReader(), FakeWriter(), client_mode=False) as inverter:
+        stream = inverter.local.stream
+        stream._set_serial_no(snr= 123344)    
+        stream.new_data['inverter'] = True
+        stream.db.db['inverter'] = {}
+        await inverter.async_publ_mqtt()
+        assert stream.new_data['inverter'] == True
+
+@pytest.mark.asyncio
+async def test_mqtt_except(config_conn, patch_open_connection, patch_mqtt_except):
+    _ = config_conn
+    _ = patch_open_connection
+    _ = patch_mqtt_except
+    assert asyncio.get_running_loop()
+
+    Proxy.class_init()
+
+    with InverterG3P(FakeReader(), FakeWriter(), client_mode=False) as inverter:
+        stream = inverter.local.stream
+        stream._set_serial_no(snr= 123344)
+
+        stream.new_data['inverter'] = True
+        stream.db.db['inverter'] = {}
+        await inverter.async_publ_mqtt()
+        assert stream.new_data['inverter'] == True
--- a/app/tests/test_modbus.py
+++ b/app/tests/test_modbus.py
@@ -77,9 +77,10 @@ def test_recv_resp_crc_err():
    mb.last_fcode = 3   
    mb.last_reg = 0x300e
    mb.last_len = 2
+    mb.set_node_id('test')
    # check matching response, but with CRC error
    call = 0
-    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x04\x01\x2c\x00\x46\xbb\xf3', 'test'):
+    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x04\x01\x2c\x00\x46\xbb\xf3'):
        call += 1
    assert mb.err == 1
    assert 0 == call
@@ -97,10 +98,11 @@ def test_recv_resp_invalid_addr():
    mb.last_fcode = 3   
    mb.last_reg = 0x300e
    mb.last_len = 2
+    mb.set_node_id('test')

    # check not matching response, with wrong server addr
    call = 0
-    for key, update in mb.recv_resp(mb.db, b'\x02\x03\x04\x01\x2c\x00\x46\x88\xf4', 'test'):
+    for key, update in mb.recv_resp(mb.db, b'\x02\x03\x04\x01\x2c\x00\x46\x88\xf4'):
        call += 1
    assert mb.err == 2
    assert 0 == call
@@ -120,7 +122,8 @@ def test_recv_recv_fcode():
   
    # check not matching response, with wrong function code
    call = 0
-    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x04\x01\x2c\x00\x46\xbb\xf4', 'test'):
+    mb.set_node_id('test')
+    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x04\x01\x2c\x00\x46\xbb\xf4'):
        call += 1

    assert mb.err == 3
@@ -142,7 +145,8 @@ def test_recv_resp_len():

    # check not matching response, with wrong data length
    call = 0
-    for key, update, _ in mb.recv_resp(mb.db, b'\x01\x03\x04\x01\x2c\x00\x46\xbb\xf4', 'test'):
+    mb.set_node_id('test')
+    for key, update, _ in mb.recv_resp(mb.db, b'\x01\x03\x04\x01\x2c\x00\x46\xbb\xf4'):
        call += 1

    assert mb.err == 4
@@ -161,7 +165,8 @@ def test_recv_unexpect_resp():
   
    # check unexpected response, which must be dropped
    call = 0
-    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x04\x01\x2c\x00\x46\xbb\xf4', 'test'):
+    mb.set_node_id('test')
+    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x04\x01\x2c\x00\x46\xbb\xf4'):
        call += 1

    assert mb.err == 5
@@ -177,8 +182,9 @@ def test_parse_resp():
    assert mb.req_pend

    call = 0
+    mb.set_node_id('test')
    exp_result = ['V0.0.2C', 4.4, 0.7, 0.7, 30]
-    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x0c\x01\x2c\x00\x2c\x00\x2c\x00\x46\x00\x46\x00\x46\x32\xc8', 'test'):
+    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x0c\x01\x2c\x00\x2c\x00\x2c\x00\x46\x00\x46\x00\x46\x32\xc8'):
        if key == 'grid':
            assert update == True
        elif key == 'inverter':
@@ -226,8 +232,9 @@ def test_queue2():
    assert mb.send_calls == 1
    assert mb.pdu == b'\x01\x030\x07\x00\x06{\t'
    call = 0
+    mb.set_node_id('test')
    exp_result = ['V0.0.2C', 4.4, 0.7, 0.7, 30]
-    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x0c\x01\x2c\x00\x2c\x00\x2c\x00\x46\x00\x46\x00\x46\x32\xc8', 'test'):
+    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x0c\x01\x2c\x00\x2c\x00\x2c\x00\x46\x00\x46\x00\x46\x32\xc8'):
        if key == 'grid':
            assert update == True
        elif key == 'inverter':
@@ -245,14 +252,14 @@ def test_queue2():
    assert mb.send_calls == 2
    assert mb.pdu == b'\x01\x06\x20\x08\x00\x04\x02\x0b'

-    for key, update, val in mb.recv_resp(mb.db, b'\x01\x06\x20\x08\x00\x04\x02\x0b', 'test'):
+    for key, update, val in mb.recv_resp(mb.db, b'\x01\x06\x20\x08\x00\x04\x02\x0b'):
        pass  # call generator mb.recv_resp()

    assert mb.que.qsize() == 0
    assert mb.send_calls == 3
    assert mb.pdu == b'\x01\x030\x07\x00\x06{\t'
    call = 0
-    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x0c\x01\x2c\x00\x2c\x00\x2c\x00\x46\x00\x46\x00\x46\x32\xc8', 'test'):
+    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x0c\x01\x2c\x00\x2c\x00\x2c\x00\x46\x00\x46\x00\x46\x32\xc8'):
        call += 1
    assert 0 == mb.err
    assert 5 == call
@@ -276,8 +283,9 @@ def test_queue3():
    assert mb.recv_responses == 0

    call = 0
+    mb.set_node_id('test')
    exp_result = ['V0.0.2C', 4.4, 0.7, 0.7, 30]
-    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x0c\x01\x2c\x00\x2c\x00\x2c\x00\x46\x00\x46\x00\x46\x32\xc8', 'test'):
+    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x0c\x01\x2c\x00\x2c\x00\x2c\x00\x46\x00\x46\x00\x46\x32\xc8'):
        if key == 'grid':
            assert update == True
        elif key == 'inverter':
@@ -296,7 +304,7 @@ def test_queue3():
    assert mb.send_calls == 2
    assert mb.pdu == b'\x01\x06\x20\x08\x00\x04\x02\x0b'

-    for key, update, val in mb.recv_resp(mb.db, b'\x01\x06\x20\x08\x00\x04\x02\x0b', 'test'):
+    for key, update, val in mb.recv_resp(mb.db, b'\x01\x06\x20\x08\x00\x04\x02\x0b'):
        pass  # no code in loop is OK; calling the generator is the purpose
    assert 0 == mb.err
    assert mb.recv_responses == 2
@@ -305,7 +313,7 @@ def test_queue3():
    assert mb.send_calls == 3
    assert mb.pdu == b'\x01\x030\x07\x00\x06{\t'
    call = 0
-    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x0c\x01\x2c\x00\x2c\x00\x2c\x00\x46\x00\x46\x00\x46\x32\xc8', 'test'):
+    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x0c\x01\x2c\x00\x2c\x00\x2c\x00\x46\x00\x46\x00\x46\x32\xc8'):
        call += 1
    assert 0 == mb.err
    assert mb.recv_responses == 2
@@ -373,7 +381,8 @@ def test_recv_unknown_data():

    # check matching response, but with CRC error
    call = 0
-    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x04\x01\x2c\x00\x46\xbb\xf4', 'test'):
+    mb.set_node_id('test')
+    for key, update, val in mb.recv_resp(mb.db, b'\x01\x03\x04\x01\x2c\x00\x46\xbb\xf4'):
        call += 1
    assert mb.err == 0
    assert 0 == call
--- a/app/tests/test_modbus_tcp.py
+++ b/app/tests/test_modbus_tcp.py
@@ -1,20 +1,17 @@
 # test_with_pytest.py
 import pytest
 import asyncio
+from aiomqtt import MqttCodeError

 from mock import patch
 from enum import Enum
-from enum import Enum
 from app.src.singleton import Singleton
 from app.src.config import Config
 from app.src.infos import Infos
 from app.src.mqtt import Mqtt
+from app.src.inverter_base import InverterBase
 from app.src.messages import Message, State
-from app.src.inverter import Inverter
-from app.src.modbus_tcp import ModbusConn, ModbusTcp
-from app.src.mqtt import Mqtt
-from app.src.messages import Message, State
-from app.src.inverter import Inverter
+from app.src.proxy import Proxy
 from app.src.modbus_tcp import ModbusConn, ModbusTcp


@@ -55,6 +52,10 @@ def config_conn(test_hostname, test_port):
                            'proxy_node_id': 'test_1',
                            'proxy_unique_id': ''
                        },
+                        'solarman':{
+                            'host': 'access1.solarmanpv.com',
+                            'port': 10000
+                        },
                        'inverters':{
                            'allow_all': True,
                            "R170000000000001":{
@@ -68,62 +69,101 @@ def config_conn(test_hostname, test_port):
                                'sensor_list': 0x2b0,
                                'client_mode':{
                                    'host': '192.168.0.1', 
-                                    'port': 8899
+                                    'port': 8899,
+                                    'forward': True
                                }  
                            }
                        }
    }


-class TestType(Enum):
+class FakeReader():
    RD_TEST_0_BYTES = 1
    RD_TEST_TIMEOUT = 2
+    RD_TEST_13_BYTES = 3
+    RD_TEST_SW_EXCEPT = 4
+    RD_TEST_OS_ERROR = 5

-
-test  = TestType.RD_TEST_0_BYTES
-
-
-class FakeReader():
    def __init__(self):
        self.on_recv =  asyncio.Event()
+        self.test  = self.RD_TEST_0_BYTES
+
    async def read(self, max_len: int):
+        print(f'fakeReader test: {self.test}')
        await self.on_recv.wait()
-        if test == TestType.RD_TEST_0_BYTES:
+        if self.test == self.RD_TEST_0_BYTES:
            return b''
-        elif test == TestType.RD_TEST_TIMEOUT:
+        elif self.test == self.RD_TEST_13_BYTES:
+            print('fakeReader return 13 bytes')
+            self.test = self.RD_TEST_0_BYTES
+            return b'test-data-req'
+        elif self.test == self.RD_TEST_TIMEOUT:
            raise TimeoutError
+        elif self.test == self.RD_TEST_SW_EXCEPT:
+            self.test = self.RD_TEST_0_BYTES
+            self.unknown_var += 1    
+        elif self.test == self.RD_TEST_OS_ERROR:
+            self.test = self.RD_TEST_0_BYTES
+            raise ConnectionRefusedError
+
    def feed_eof(self):
        return


 class FakeWriter():
+    def __init__(self, conn='remote.intern'):
+        self.conn = conn
+        self.closing = False
    def write(self, buf: bytes):
        return
+    async def drain(self):
+        await asyncio.sleep(0)
    def get_extra_info(self, sel: str):
        if sel == 'peername':
-            return 'remote.intern'
+            return self.conn
        elif sel == 'sockname':
            return 'sock:1234'
        assert False
    def is_closing(self):
-        return False
+        return self.closing
    def close(self):
-        return
+        self.closing = True
    async def wait_closed(self):
-        return
+        await asyncio.sleep(0)


@pytest.fixture
 def patch_open():
    async def new_conn(conn):
        await asyncio.sleep(0)
-        return FakeReader(), FakeWriter()
+        return FakeReader(), FakeWriter(conn)
    
    def new_open(host: str, port: int):
-        global test
-        if test == TestType.RD_TEST_TIMEOUT:
-            raise TimeoutError
-        return new_conn(None)
+        return new_conn(f'{host}:{port}')
+
+    with patch.object(asyncio, 'open_connection', new_open) as conn:
+        yield conn
+
+@pytest.fixture
+def patch_open_timeout():
+    def new_open(host: str, port: int):
+        raise TimeoutError
+
+    with patch.object(asyncio, 'open_connection', new_open) as conn:
+        yield conn
+
+@pytest.fixture
+def patch_open_value_error():
+    def new_open(host: str, port: int):
+        raise ValueError
+
+    with patch.object(asyncio, 'open_connection', new_open) as conn:
+        yield conn
+
+@pytest.fixture
+def patch_open_conn_abort():
+    def new_open(host: str, port: int):
+        raise ConnectionAbortedError

    with patch.object(asyncio, 'open_connection', new_open) as conn:
        yield conn
@@ -134,23 +174,38 @@ def patch_no_mqtt():
        yield conn

@pytest.fixture
-def patch_no_mqtt():
-    with patch.object(Mqtt, 'publish') as conn:
+def patch_mqtt_err():
+    def new_publish(self, key, data):
+        raise MqttCodeError(None)
+
+    with patch.object(Mqtt, 'publish', new_publish) as conn:
        yield conn

+@pytest.fixture
+def patch_mqtt_except():
+    def new_publish(self, key, data):
+        raise ValueError("Test")
+
+    with patch.object(Mqtt, 'publish', new_publish) as conn:
+        yield conn

@pytest.mark.asyncio
 async def test_modbus_conn(patch_open):
    _ = patch_open
    assert Infos.stat['proxy']['Inverter_Cnt'] == 0

-    async with ModbusConn('test.local', 1234) as stream:
+    async with ModbusConn('test.local', 1234) as inverter:
+        stream = inverter.local.stream
        assert stream.node_id == 'G3P'
-        assert stream.addr == ('test.local', 1234)
-        assert type(stream.reader) is FakeReader
-        assert type(stream.writer) is FakeWriter
+        assert stream.addr == ('test.local:1234')
+        assert type(stream.ifc._reader) is FakeReader
+        assert type(stream.ifc._writer) is FakeWriter
        assert Infos.stat['proxy']['Inverter_Cnt'] == 1
-    
+        del inverter
+
+    for _ in InverterBase:
+        assert False
+
    assert Infos.stat['proxy']['Inverter_Cnt'] == 0

@pytest.mark.asyncio
@@ -161,13 +216,47 @@ async def test_modbus_no_cnf():
    assert Infos.stat['proxy']['Inverter_Cnt'] == 0

@pytest.mark.asyncio
-async def test_modbus_cnf1(config_conn, patch_open):
+async def test_modbus_timeout(config_conn, patch_open_timeout):
    _ = config_conn
-    _ = patch_open
-    global test
+    _ = patch_open_timeout
    assert asyncio.get_running_loop()
-    Inverter.class_init()
-    test = TestType.RD_TEST_TIMEOUT
+    Proxy.class_init()
+
+    assert Infos.stat['proxy']['Inverter_Cnt'] == 0
+    loop = asyncio.get_event_loop()
+    ModbusTcp(loop)
+    await asyncio.sleep(0.01)
+    for m in Message:
+        if (m.node_id == 'inv_2'):
+            assert False
+        
+    await asyncio.sleep(0.01)
+    assert Infos.stat['proxy']['Inverter_Cnt'] == 0
+
+@pytest.mark.asyncio
+async def test_modbus_value_err(config_conn, patch_open_value_error):
+    _ = config_conn
+    _ = patch_open_value_error
+    assert asyncio.get_running_loop()
+    Proxy.class_init()
+
+    assert Infos.stat['proxy']['Inverter_Cnt'] == 0
+    loop = asyncio.get_event_loop()
+    ModbusTcp(loop)
+    await asyncio.sleep(0.01)
+    for m in Message:
+        if (m.node_id == 'inv_2'):
+            assert False
+        
+    await asyncio.sleep(0.01)
+    assert Infos.stat['proxy']['Inverter_Cnt'] == 0
+
+@pytest.mark.asyncio
+async def test_modbus_conn_abort(config_conn, patch_open_conn_abort):
+    _ = config_conn
+    _ = patch_open_conn_abort
+    assert asyncio.get_running_loop()
+    Proxy.class_init()

    assert Infos.stat['proxy']['Inverter_Cnt'] == 0
    loop = asyncio.get_event_loop()
@@ -185,10 +274,8 @@ async def test_modbus_cnf2(config_conn, patch_no_mqtt, patch_open):
    _ = config_conn
    _ = patch_open
    _ = patch_no_mqtt
-    global test
    assert asyncio.get_running_loop()
-    Inverter.class_init()
-    test = TestType.RD_TEST_0_BYTES
+    Proxy.class_init()

    assert Infos.stat['proxy']['Inverter_Cnt'] == 0
    ModbusTcp(asyncio.get_event_loop())
@@ -199,7 +286,7 @@ async def test_modbus_cnf2(config_conn, patch_no_mqtt, patch_open):
            test += 1
            assert Infos.stat['proxy']['Inverter_Cnt'] == 1
            m.shutdown_started = True
-            m.reader.on_recv.set()
+            m.ifc._reader.on_recv.set()
            del m
        
    assert 1 == test
@@ -211,10 +298,8 @@ async def test_modbus_cnf3(config_conn, patch_no_mqtt, patch_open):
    _ = config_conn
    _ = patch_open
    _ = patch_no_mqtt
-    global test
    assert asyncio.get_running_loop()
-    Inverter.class_init()
-    test = TestType.RD_TEST_0_BYTES
+    Proxy.class_init()

    assert Infos.stat['proxy']['Inverter_Cnt'] == 0
    ModbusTcp(asyncio.get_event_loop(), tim_restart= 0)
@@ -226,15 +311,76 @@ async def test_modbus_cnf3(config_conn, patch_no_mqtt, patch_open):
            test += 1
            if test == 1:
                m.shutdown_started = False
-                m.reader.on_recv.set()
+                m.ifc._reader.on_recv.set()
                await asyncio.sleep(0.1)
                assert m.state == State.closed
                await asyncio.sleep(0.1)
            else:
                m.shutdown_started = True
-                m.reader.on_recv.set()
+                m.ifc._reader.on_recv.set()
                del m

    assert 2 == test
    await asyncio.sleep(0.01)
    assert Infos.stat['proxy']['Inverter_Cnt'] == 0
+
+@pytest.mark.asyncio
+async def test_mqtt_err(config_conn, patch_mqtt_err, patch_open):
+    _ = config_conn
+    _ = patch_open
+    _ = patch_mqtt_err
+    assert asyncio.get_running_loop()
+    Proxy.class_init()
+
+    assert Infos.stat['proxy']['Inverter_Cnt'] == 0
+    ModbusTcp(asyncio.get_event_loop(), tim_restart= 0)
+    await asyncio.sleep(0.01)
+    test = 0
+    for m in Message:
+        if (m.node_id == 'inv_2'):
+            assert Infos.stat['proxy']['Inverter_Cnt'] == 1
+            test += 1
+            if test == 1:
+                m.shutdown_started = False
+                m.ifc._reader.on_recv.set()
+                await asyncio.sleep(0.1)
+                assert m.state == State.closed
+                await asyncio.sleep(0.1)
+                await asyncio.sleep(0.1)
+            else:
+                m.shutdown_started = True
+                m.ifc._reader.on_recv.set()
+                del m
+
+    await asyncio.sleep(0.01)
+    assert Infos.stat['proxy']['Inverter_Cnt'] == 0
+
+@pytest.mark.asyncio
+async def test_mqtt_except(config_conn, patch_mqtt_except, patch_open):
+    _ = config_conn
+    _ = patch_open
+    _ = patch_mqtt_except
+    assert asyncio.get_running_loop()
+    Proxy.class_init()
+
+    assert Infos.stat['proxy']['Inverter_Cnt'] == 0
+    ModbusTcp(asyncio.get_event_loop(), tim_restart= 0)
+    await asyncio.sleep(0.01)
+    test = 0
+    for m in Message:
+        if (m.node_id == 'inv_2'):
+            assert Infos.stat['proxy']['Inverter_Cnt'] == 1
+            test += 1
+            if test == 1:
+                m.shutdown_started = False
+                m.ifc._reader.on_recv.set()
+                await asyncio.sleep(0.1)
+                assert m.state == State.closed
+                await asyncio.sleep(0.1)
+            else:
+                m.shutdown_started = True
+                m.ifc._reader.on_recv.set()
+                del m
+
+    await asyncio.sleep(0.01)
+    assert Infos.stat['proxy']['Inverter_Cnt'] == 0
--- a/app/tests/test_mqtt.py
+++ b/app/tests/test_mqtt.py
@@ -5,6 +5,7 @@ import aiomqtt
 import logging

 from mock import patch, Mock
+from app.src.async_stream import AsyncIfcImpl
 from app.src.singleton import Singleton
 from app.src.mqtt import Mqtt
 from app.src.modbus import Modbus
@@ -44,7 +45,7 @@ def config_no_conn(test_port):

@pytest.fixture
 def spy_at_cmd():
-    conn = SolarmanV5(server_side=True, client_mode= False)
+    conn = SolarmanV5(('test.local', 1234), server_side=True, client_mode= False, ifc=AsyncIfcImpl())
    conn.node_id = 'inv_2/'
    with patch.object(conn, 'send_at_cmd', wraps=conn.send_at_cmd) as wrapped_conn:
        yield wrapped_conn
@@ -52,7 +53,7 @@ def spy_at_cmd():

@pytest.fixture
 def spy_modbus_cmd():
-    conn = SolarmanV5(server_side=True, client_mode= False)
+    conn = SolarmanV5(('test.local', 1234), server_side=True, client_mode= False, ifc=AsyncIfcImpl())
    conn.node_id = 'inv_1/'
    with patch.object(conn, 'send_modbus_cmd', wraps=conn.send_modbus_cmd) as wrapped_conn:
        yield wrapped_conn
@@ -60,7 +61,7 @@ def spy_modbus_cmd():

@pytest.fixture
 def spy_modbus_cmd_client():
-    conn = SolarmanV5(server_side=False, client_mode= False)
+    conn = SolarmanV5(('test.local', 1234), server_side=False, client_mode= False, ifc=AsyncIfcImpl())
    conn.node_id = 'inv_1/'
    with patch.object(conn, 'send_modbus_cmd', wraps=conn.send_modbus_cmd) as wrapped_conn:
        yield wrapped_conn
--- a/app/tests/test_inverter.py
+++ b/app/tests/test_inverter.py
@@ -6,7 +6,7 @@ import logging

 from mock import patch, Mock
 from app.src.singleton import Singleton
-from app.src.inverter import Inverter
+from app.src.proxy import Proxy
 from app.src.mqtt import Mqtt
 from app.src.gen3plus.solarman_v5 import SolarmanV5
 from app.src.config import Config
@@ -18,7 +18,7 @@ pytest_plugins = ('pytest_asyncio',)
@pytest.fixture(scope="module", autouse=True)
 def module_init():
    def new_init(cls, cb_mqtt_is_up):
-        cb_mqtt_is_up()
+        pass  # empty test methos

    Singleton._instances.clear()
    with patch.object(Mqtt, '__init__', new_init):
@@ -63,12 +63,13 @@ def config_conn(test_hostname, test_port):
 async def test_inverter_cb(config_conn):
    _ = config_conn

-    with patch.object(Inverter, '_cb_mqtt_is_up', wraps=Inverter._cb_mqtt_is_up) as spy:
-        print('call Inverter.class_init')
-        Inverter.class_init()
-        assert 'homeassistant/' == Inverter.discovery_prfx
-        assert 'tsun/' == Inverter.entity_prfx
-        assert 'test_1/' == Inverter.proxy_node_id
+    with patch.object(Proxy, '_cb_mqtt_is_up', wraps=Proxy._cb_mqtt_is_up) as spy:
+        print('call Proxy.class_init')
+        Proxy.class_init()
+        assert 'homeassistant/' == Proxy.discovery_prfx
+        assert 'tsun/' == Proxy.entity_prfx
+        assert 'test_1/' == Proxy.proxy_node_id
+        await Proxy._cb_mqtt_is_up()
        spy.assert_called_once()

@pytest.mark.asyncio
@@ -76,8 +77,8 @@ async def test_mqtt_is_up(config_conn):
    _ = config_conn

    with patch.object(Mqtt, 'publish') as spy:
-        Inverter.class_init()
-        await Inverter._cb_mqtt_is_up()
+        Proxy.class_init()
+        await Proxy._cb_mqtt_is_up()
        spy.assert_called()

@pytest.mark.asyncio
@@ -85,6 +86,6 @@ async def test_mqtt_proxy_statt_invalid(config_conn):
    _ = config_conn

    with patch.object(Mqtt, 'publish') as spy:
-        Inverter.class_init()
-        await Inverter._async_publ_mqtt_proxy_stat('InValId_kEy')
+        Proxy.class_init()
+        await Proxy._async_publ_mqtt_proxy_stat('InValId_kEy')
        spy.assert_not_called()
--- a/app/tests/test_solarman.py
+++ b/app/tests/test_solarman.py
@@ -5,7 +5,8 @@ import asyncio
 import logging
 import random
 from math import isclose
-from app.src.gen3plus.solarman_v5 import SolarmanV5
+from app.src.async_stream import AsyncIfcImpl, StreamPtr
+from app.src.gen3plus.solarman_v5 import SolarmanV5, SolarmanBase
 from app.src.config import Config
 from app.src.infos import Infos, Register
 from app.src.modbus import Modbus
@@ -20,13 +21,6 @@ Infos.static_init()
 timestamp = int(time.time())  # 1712861197
 heartbeat = 60         

-class Writer():
-    def __init__(self):
-        self.sent_pdu = b''
-
-    def write(self, pdu: bytearray):
-        self.sent_pdu = pdu
-

 class Mqtt():
    def __init__(self):
@@ -38,14 +32,24 @@ class Mqtt():
        self.data = data


+class FakeIfc(AsyncIfcImpl):
+    def __init__(self):
+        super().__init__()
+        self.remote = StreamPtr(None)
+
+    async def create_remote(self):
+        await asyncio.sleep(0)
+
 class MemoryStream(SolarmanV5):
    def __init__(self, msg, chunks = (0,), server_side: bool = True):
-        super().__init__(server_side, client_mode=False)
+        _ifc = FakeIfc()
+        super().__init__(('test.local', 1234), _ifc, server_side, client_mode=False)
        if server_side:
            self.mb.timeout = 0.4   # overwrite for faster testing
        self.mb_first_timeout = 0.5
        self.mb_timeout = 0.5
-        self.writer = Writer()
+        self.sent_pdu = b''
+        self.ifc.tx_fifo.reg_trigger(self.write_cb)
        self.mqtt = Mqtt()
        self.__msg = msg
        self.__msg_len = len(msg)
@@ -64,6 +68,11 @@ class MemoryStream(SolarmanV5):
        self.data = ''
        self.msg_recvd = []

+    def write_cb(self):
+        if self.test_exception_async_write:
+            raise RuntimeError("Peer closed.")
+        self.sent_pdu = self.ifc.tx_fifo.get()
+
    def _timestamp(self):
        return timestamp
    
@@ -86,28 +95,24 @@ class MemoryStream(SolarmanV5):
                chunk_len = self.__chunks[self.__chunk_idx]
                self.__chunk_idx += 1
                if chunk_len!=0:
-                    self._recv_buffer += self.__msg[self.__offs:chunk_len]
+                    self.ifc.rx_fifo += self.__msg[self.__offs:chunk_len]
                    copied_bytes = chunk_len - self.__offs
                    self.__offs = chunk_len
                else:
-                    self._recv_buffer += self.__msg[self.__offs:]
+                    self.ifc.rx_fifo += self.__msg[self.__offs:]
                    copied_bytes = self.__msg_len - self.__offs
                    self.__offs = self.__msg_len
        except Exception:
            pass   # ignore exceptions here
        return copied_bytes
    
-    async def async_write(self, headline=''):
-        if self.test_exception_async_write:
-            raise RuntimeError("Peer closed.")
-
    def createClientStream(self, msg, chunks = (0,)):
        c = MemoryStream(msg, chunks, False)
-        self.remote_stream = c
-        c. remote_stream = self
+        self.ifc.remote.stream = c
+        c.ifc.remote.stream = self
        return c

-    def _SolarmanV5__flush_recv_msg(self) -> None:
+    def _SolarmanBase__flush_recv_msg(self) -> None:
        self.msg_recvd.append(
            {
                'control': self.control,
@@ -115,7 +120,7 @@ class MemoryStream(SolarmanV5):
                'data_len': self.data_len
            }
        )
-        super()._SolarmanV5__flush_recv_msg()
+        super()._SolarmanBase__flush_recv_msg()
        self.msg_count += 1


@@ -680,6 +685,7 @@ def config_tsun_inv1():
    Config.act_config = {'solarman':{'enabled': True},'inverters':{'Y170000000000001':{'monitor_sn': 2070233889, 'node_id':'inv1', 'modbus_polling': True, 'suggested_area':'roof', 'sensor_list': 688}}}

 def test_read_message(device_ind_msg):
+    Config.act_config = {'solarman':{'enabled': True}}
    m = MemoryStream(device_ind_msg, (0,))
    m.read()         # read complete msg, and dispatch msg
    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
@@ -690,9 +696,9 @@ def test_read_message(device_ind_msg):
    assert m.control == 0x4110
    assert str(m.seq) == '01:00'
    assert m.data_len == 0xd4
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -711,9 +717,9 @@ def test_invalid_start_byte(invalid_start_byte, device_ind_msg):
    assert m.control == 0x4110
    assert str(m.seq) == '01:00'
    assert m.data_len == 0xd4
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 1
    m.close()

@@ -731,9 +737,9 @@ def test_invalid_stop_byte(invalid_stop_byte):
    assert m.control == 0x4110
    assert str(m.seq) == '01:00'
    assert m.data_len == 0xd4
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 1
    m.close()

@@ -756,9 +762,9 @@ def test_invalid_stop_byte2(invalid_stop_byte, device_ind_msg):
    assert m.msg_recvd[1]['data_len']==0xd4

    assert m.unique_id == None
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 1
    m.close()

@@ -778,9 +784,9 @@ def test_invalid_stop_start_byte(invalid_stop_byte, invalid_start_byte):
    assert m.control == 0x4110
    assert str(m.seq) == '01:00'
    assert m.data_len == 0xd4
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 1
    m.close()

@@ -802,9 +808,9 @@ def test_invalid_checksum(invalid_checksum, device_ind_msg):
    assert m.msg_recvd[1]['control']==0x4110
    assert m.msg_recvd[1]['seq']=='01:00'
    assert m.msg_recvd[1]['data_len']==0xd4
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 1
    m.close()

@@ -824,8 +830,8 @@ def test_read_message_twice(config_no_tsun_inv1, device_ind_msg, device_rsp_msg)
    assert m.msg_recvd[1]['control']==0x4110
    assert m.msg_recvd[1]['seq']=='01:01'
    assert m.msg_recvd[1]['data_len']==0xd4
-    assert m._send_buffer==device_rsp_msg+device_rsp_msg
-    assert m._forward_buffer==b''
+    assert m.ifc.tx_fifo.get()==device_rsp_msg+device_rsp_msg
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -896,12 +902,11 @@ def test_read_two_messages(config_tsun_allow_all, device_ind_msg, device_rsp_msg
    assert m.msg_recvd[1]['data_len']==0x199
    assert '02b0' == m.db.get_db_value(Register.SENSOR_LIST, None)
    assert 0x02b0 == m.sensor_list
-    assert m._forward_buffer==device_ind_msg+inverter_ind_msg
-    assert m._send_buffer==device_rsp_msg+inverter_rsp_msg
+    assert m.ifc.fwd_fifo.get()==device_ind_msg+inverter_ind_msg
+    assert m.ifc.tx_fifo.get()==device_rsp_msg+inverter_rsp_msg

-    m._send_buffer = bytearray(0) # clear send buffer for next test    
    m._init_new_client_conn()
-    assert m._send_buffer==b''
+    assert m.ifc.tx_fifo.get()==b''
    m.close()

 def test_read_two_messages2(config_tsun_allow_all, inverter_ind_msg, inverter_ind_msg_81, inverter_rsp_msg, inverter_rsp_msg_81):
@@ -922,12 +927,11 @@ def test_read_two_messages2(config_tsun_allow_all, inverter_ind_msg, inverter_in
    assert m.msg_recvd[1]['seq']=='03:03'
    assert m.msg_recvd[1]['data_len']==0x199
    assert m.time_ofs == 0x33e447a0
-    assert m._forward_buffer==inverter_ind_msg+inverter_ind_msg_81
-    assert m._send_buffer==inverter_rsp_msg+inverter_rsp_msg_81
+    assert m.ifc.fwd_fifo.get()==inverter_ind_msg+inverter_ind_msg_81
+    assert m.ifc.tx_fifo.get()==inverter_rsp_msg+inverter_rsp_msg_81

-    m._send_buffer = bytearray(0) # clear send buffer for next test    
    m._init_new_client_conn()
-    assert m._send_buffer==b''
+    assert m.ifc.tx_fifo.get()==b''
    m.close()

 def test_read_two_messages3(config_tsun_allow_all, device_ind_msg2, device_rsp_msg2, inverter_ind_msg, inverter_rsp_msg):
@@ -952,12 +956,11 @@ def test_read_two_messages3(config_tsun_allow_all, device_ind_msg2, device_rsp_m
    assert m.msg_recvd[1]['data_len']==0xd4
    assert '02b0' == m.db.get_db_value(Register.SENSOR_LIST, None)
    assert 0x02b0 == m.sensor_list
-    assert m._forward_buffer==inverter_ind_msg+device_ind_msg2
-    assert m._send_buffer==inverter_rsp_msg+device_rsp_msg2
+    assert m.ifc.fwd_fifo.get()==inverter_ind_msg+device_ind_msg2
+    assert m.ifc.tx_fifo.get()==inverter_rsp_msg+device_rsp_msg2

-    m._send_buffer = bytearray(0) # clear send buffer for next test    
    m._init_new_client_conn()
-    assert m._send_buffer==b''
+    assert m.ifc.tx_fifo.get()==b''
    m.close()

 def test_unkown_frame_code(config_tsun_inv1, inverter_ind_msg_81, inverter_rsp_msg_81):
@@ -972,9 +975,9 @@ def test_unkown_frame_code(config_tsun_inv1, inverter_ind_msg_81, inverter_rsp_m
    assert m.control == 0x4210
    assert str(m.seq) == '03:03'
    assert m.data_len == 0x199
-    assert m._recv_buffer==b''
-    assert m._send_buffer==inverter_rsp_msg_81
-    assert m._forward_buffer==inverter_ind_msg_81
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==inverter_rsp_msg_81
+    assert m.ifc.fwd_fifo.get()==inverter_ind_msg_81
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -990,9 +993,9 @@ def test_unkown_message(config_tsun_inv1, unknown_msg):
    assert m.control == 0x5110
    assert str(m.seq) == '84:10'
    assert m.data_len == 0x0a
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==unknown_msg
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==unknown_msg
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -1008,9 +1011,9 @@ def test_device_rsp(config_tsun_inv1, device_rsp_msg):
    assert m.control == 0x1110
    assert str(m.seq) == '01:01'
    assert m.data_len == 0x0a
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -1026,9 +1029,9 @@ def test_inverter_rsp(config_tsun_inv1, inverter_rsp_msg):
    assert m.control == 0x1210
    assert str(m.seq) == '02:02'
    assert m.data_len == 0x0a
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -1043,9 +1046,9 @@ def test_heartbeat_ind(config_tsun_inv1, heartbeat_ind_msg, heartbeat_rsp_msg):
    assert m.control == 0x4710
    assert str(m.seq) == '84:11'  # value after sending response
    assert m.data_len == 0x01
-    assert m._recv_buffer==b''
-    assert m._send_buffer==heartbeat_rsp_msg
-    assert m._forward_buffer==heartbeat_ind_msg
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==heartbeat_rsp_msg
+    assert m.ifc.fwd_fifo.get()==heartbeat_ind_msg
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -1061,9 +1064,9 @@ def test_heartbeat_ind2(config_tsun_inv1, heartbeat_ind_msg, heartbeat_rsp_msg):
    assert m.control == 0x4710
    assert str(m.seq) == '84:11'  # value after sending response
    assert m.data_len == 0x01
-    assert m._recv_buffer==b''
-    assert m._send_buffer==heartbeat_rsp_msg
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==heartbeat_rsp_msg
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -1079,9 +1082,9 @@ def test_heartbeat_rsp(config_tsun_inv1, heartbeat_rsp_msg):
    assert m.control == 0x1710
    assert str(m.seq) == '11:84'  # value after sending response
    assert m.data_len == 0x0a
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -1096,15 +1099,15 @@ def test_sync_start_ind(config_tsun_inv1, sync_start_ind_msg, sync_start_rsp_msg
    assert m.control == 0x4310
    assert str(m.seq) == '0d:0d'  # value after sending response
    assert m.data_len == 47
-    assert m._recv_buffer==b''
-    assert m._send_buffer==sync_start_rsp_msg
-    assert m._forward_buffer==sync_start_ind_msg
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==sync_start_rsp_msg
+    assert m.ifc.fwd_fifo.peek()==sync_start_ind_msg
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0

    m.seq.server_side = False  # simulate forawding to TSUN cloud
-    m._update_header(m._forward_buffer)
+    m._SolarmanBase__update_header(m.ifc.fwd_fifo.peek())
    assert str(m.seq) == '0d:0e'  # value after forwarding indication
-    assert m._forward_buffer==sync_start_fwd_msg
+    assert m.ifc.fwd_fifo.get()==sync_start_fwd_msg

    m.close()

@@ -1120,9 +1123,9 @@ def test_sync_start_rsp(config_tsun_inv1, sync_start_rsp_msg):
    assert m.control == 0x1310
    assert str(m.seq) == '0d:0d'  # value after sending response
    assert m.data_len == 0x0a
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -1137,9 +1140,9 @@ def test_sync_end_ind(config_tsun_inv1, sync_end_ind_msg, sync_end_rsp_msg):
    assert m.control == 0x4810
    assert str(m.seq) == '07:07'  # value after sending response
    assert m.data_len == 60
-    assert m._recv_buffer==b''
-    assert m._send_buffer==sync_end_rsp_msg
-    assert m._forward_buffer==sync_end_ind_msg
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==sync_end_rsp_msg
+    assert m.ifc.fwd_fifo.get()==sync_end_ind_msg
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -1155,9 +1158,9 @@ def test_sync_end_rsp(config_tsun_inv1, sync_end_rsp_msg):
    assert m.control == 0x1810
    assert str(m.seq) == '07:07'  # value after sending response
    assert m.data_len == 0x0a
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -1175,9 +1178,9 @@ def test_build_modell_600(config_tsun_allow_all, inverter_ind_msg):
    assert '02b0' == m.db.get_db_value(Register.SENSOR_LIST, None)
    assert 0 == m.sensor_list   # must not been set by an inverter data ind

-    m._send_buffer = bytearray(0) # clear send buffer for next test    
+    m.ifc.tx_clear() # clear send buffer for next test    
    m._init_new_client_conn()
-    assert m._send_buffer==b''
+    assert m.ifc.tx_fifo.get()==b''
    m.close()

 def test_build_modell_1600(config_tsun_allow_all, inverter_ind_msg1600):
@@ -1241,9 +1244,9 @@ def test_build_logger_modell(config_tsun_allow_all, device_ind_msg):

 def test_msg_iterator():
    Message._registry.clear()
-    m1 = SolarmanV5(server_side=True, client_mode=False)
-    m2 = SolarmanV5(server_side=True, client_mode=False)
-    m3 = SolarmanV5(server_side=True, client_mode=False)
+    m1 = SolarmanV5(('test1.local', 1234), ifc=AsyncIfcImpl(), server_side=True, client_mode=False)
+    m2 = SolarmanV5(('test2.local', 1234), ifc=AsyncIfcImpl(), server_side=True, client_mode=False)
+    m3 = SolarmanV5(('test3.local', 1234), ifc=AsyncIfcImpl(), server_side=True, client_mode=False)
    m3.close()
    del m3
    test1 = 0
@@ -1261,7 +1264,7 @@ def test_msg_iterator():
    assert test2 == 1

 def test_proxy_counter():
-    m = SolarmanV5(server_side=True, client_mode=False)
+    m = SolarmanV5(('test.local', 1234), ifc=AsyncIfcImpl(), server_side=True, client_mode=False)
    assert m.new_data == {}
    m.db.stat['proxy']['Unknown_Msg'] = 0
    Infos.new_stat_data['proxy'] =  False
@@ -1285,16 +1288,14 @@ async def test_msg_build_modbus_req(config_tsun_inv1, device_ind_msg, device_rsp
    m.read()
    assert m.control == 0x4110
    assert str(m.seq) == '01:01'
-    assert m._send_buffer==device_rsp_msg
-    assert m._forward_buffer==device_ind_msg
+    assert m.ifc.tx_fifo.get()==device_rsp_msg
+    assert m.ifc.fwd_fifo.get()==device_ind_msg

-    m._send_buffer = bytearray(0) # clear send buffer for next test    
-    m._forward_buffer = bytearray(0) # clear send buffer for next test    
    await m.send_modbus_cmd(Modbus.WRITE_SINGLE_REG, 0x2008, 0, logging.DEBUG)
    assert 0 == m.send_msg_ofs
-    assert m._forward_buffer == b''
-    assert m.writer.sent_pdu == b'' # modbus command must be ignore, cause connection is still not up
-    assert m._send_buffer == b''    # modbus command must be ignore, cause connection is still not up
+    assert m.ifc.fwd_fifo.get() == b''
+    assert m.sent_pdu == b'' # modbus command must be ignore, cause connection is still not up
+    assert m.ifc.tx_fifo.get() == b''    # modbus command must be ignore, cause connection is still not up

    m.append_msg(inverter_ind_msg)
    m.read()
@@ -1304,24 +1305,15 @@ async def test_msg_build_modbus_req(config_tsun_inv1, device_ind_msg, device_rsp
    assert m.msg_recvd[0]['seq']=='01:01'
    assert m.msg_recvd[1]['control']==0x4210
    assert m.msg_recvd[1]['seq']=='02:02'
-    assert m._recv_buffer==b''
-    assert m._send_buffer==inverter_rsp_msg
-    assert m._forward_buffer==inverter_ind_msg
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==inverter_rsp_msg
+    assert m.ifc.fwd_fifo.get()==inverter_ind_msg

-    m._send_buffer = bytearray(0) # clear send buffer for next test    
-    m._forward_buffer = bytearray(0) # clear send buffer for next test    
    await m.send_modbus_cmd(Modbus.WRITE_SINGLE_REG, 0x2008, 0, logging.DEBUG)
    assert 0 == m.send_msg_ofs
-    assert m._forward_buffer == b''
-    assert m.writer.sent_pdu == msg_modbus_cmd
-    assert m._send_buffer == b''
-
-    m._send_buffer = bytearray(0) # clear send buffer for next test    
-    m.test_exception_async_write = True
-    await m.send_modbus_cmd(Modbus.WRITE_SINGLE_REG, 0x2008, 0, logging.DEBUG)
-    assert 0 == m.send_msg_ofs
-    assert m._forward_buffer == b''
-    assert m._send_buffer == b''
+    assert m.ifc.fwd_fifo.get() == b''
+    assert m.sent_pdu == msg_modbus_cmd
+    assert m.ifc.tx_fifo.get()== b''
    m.close()

@pytest.mark.asyncio
@@ -1331,14 +1323,13 @@ async def test_at_cmd(config_tsun_allow_all, device_ind_msg, device_rsp_msg, inv
    m.read()   # read device ind
    assert m.control == 0x4110
    assert str(m.seq) == '01:01'
-    assert m._send_buffer==device_rsp_msg
-    assert m._forward_buffer==device_ind_msg
+    assert m.ifc.tx_fifo.get()==device_rsp_msg
+    assert m.ifc.fwd_fifo.get()==device_ind_msg

-    m._send_buffer = bytearray(0) # clear send buffer for next test    
-    m._forward_buffer = bytearray(0) # clear send buffer for next test    
    await m.send_at_cmd('AT+TIME=214028,1,60,120')
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.sent_pdu == b''
    assert str(m.seq) == '01:01'
    assert m.mqtt.key == ''
    assert m.mqtt.data == ""
@@ -1347,34 +1338,37 @@ async def test_at_cmd(config_tsun_allow_all, device_ind_msg, device_rsp_msg, inv
    m.read() # read inverter ind
    assert m.control == 0x4210
    assert str(m.seq) == '02:02'
-    assert m._send_buffer==inverter_rsp_msg
-    assert m._forward_buffer==inverter_ind_msg
+    assert m.ifc.tx_fifo.get()==inverter_rsp_msg
+    assert m.ifc.fwd_fifo.get()==inverter_ind_msg
    
-    m._send_buffer = bytearray(0) # clear send buffer for next test    
-    m._forward_buffer = bytearray(0) # clear send buffer for next test    
    await m.send_at_cmd('AT+TIME=214028,1,60,120')
-    assert m._send_buffer==at_command_ind_msg
-    assert m._forward_buffer==b''
+    assert m.ifc.fwd_fifo.get() == b''
+    assert m.ifc.tx_fifo.get()== b''
+    assert m.sent_pdu == at_command_ind_msg
+    m.sent_pdu = bytearray()
+
    assert str(m.seq) == '02:03'
    assert m.mqtt.key == ''
    assert m.mqtt.data == ""

-    m._send_buffer = bytearray(0) # clear send buffer for next test    
    m.append_msg(at_command_rsp_msg)
    m.read() # read at resp
    assert m.control == 0x1510
    assert str(m.seq) == '03:03'
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.key == 'at_resp'
    assert m.data == "+ok"

+    m.sent_pdu = bytearray()
    m.test_exception_async_write = True
    await m.send_at_cmd('AT+TIME=214028,1,60,120')
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.sent_pdu == b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.sent_pdu == b''
    assert str(m.seq) == '03:04'
    assert m.forward_at_cmd_resp == False
    assert m.mqtt.key == ''
@@ -1388,14 +1382,12 @@ async def test_at_cmd_blocked(config_tsun_allow_all, device_ind_msg, device_rsp_
    m.read()
    assert m.control == 0x4110
    assert str(m.seq) == '01:01'
-    assert m._send_buffer==device_rsp_msg
-    assert m._forward_buffer==device_ind_msg
+    assert m.ifc.tx_fifo.get()==device_rsp_msg
+    assert m.ifc.fwd_fifo.get()==device_ind_msg

-    m._send_buffer = bytearray(0) # clear send buffer for next test    
-    m._forward_buffer = bytearray(0) # clear send buffer for next test    
    await m.send_at_cmd('AT+WEBU')
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert str(m.seq) == '01:01'
    assert m.mqtt.key == ''
    assert m.mqtt.data == ""
@@ -1404,16 +1396,14 @@ async def test_at_cmd_blocked(config_tsun_allow_all, device_ind_msg, device_rsp_
    m.read()
    assert m.control == 0x4210
    assert str(m.seq) == '02:02'
-    assert m._recv_buffer==b''
-    assert m._send_buffer==inverter_rsp_msg
-    assert m._forward_buffer==inverter_ind_msg
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==inverter_rsp_msg
+    assert m.ifc.fwd_fifo.get()==inverter_ind_msg
    
-    m._send_buffer = bytearray(0) # clear send buffer for next test    
-    m._forward_buffer = bytearray(0) # clear send buffer for next test    
    await m.send_at_cmd('AT+WEBU')
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert str(m.seq) == '02:02'
    assert m.forward_at_cmd_resp == False
    assert m.mqtt.key == 'at_resp'
@@ -1435,9 +1425,9 @@ def test_at_cmd_ind(config_tsun_inv1, at_command_ind_msg):
    assert m.control == 0x4510
    assert str(m.seq) == '03:02'
    assert m.data_len == 39
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==at_command_ind_msg
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==at_command_ind_msg
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    assert m.db.stat['proxy']['AT_Command'] == 1
    assert m.db.stat['proxy']['AT_Command_Blocked'] == 0
@@ -1459,9 +1449,9 @@ def test_at_cmd_ind_block(config_tsun_inv1, at_command_ind_msg_block):
    assert m.control == 0x4510
    assert str(m.seq) == '03:02'
    assert m.data_len == 23
-    assert m._recv_buffer==b''
-    assert m._send_buffer==b''
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    assert m.db.stat['proxy']['AT_Command'] == 0
    assert m.db.stat['proxy']['AT_Command_Blocked'] == 1
@@ -1481,8 +1471,8 @@ def test_msg_at_command_rsp1(config_tsun_inv1, at_command_rsp_msg):
    assert str(m.seq) == '03:03'
    assert m.header_len==11
    assert m.data_len==17
-    assert m._forward_buffer==at_command_rsp_msg
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==at_command_rsp_msg
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['Modbus_Command'] == 0
    m.close()
@@ -1500,8 +1490,8 @@ def test_msg_at_command_rsp2(config_tsun_inv1, at_command_rsp_msg):
    assert str(m.seq) == '03:03'
    assert m.header_len==11
    assert m.data_len==17
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['Modbus_Command'] == 0
    m.close()
@@ -1525,9 +1515,9 @@ def test_msg_modbus_req(config_tsun_inv1, msg_modbus_cmd, msg_modbus_cmd_fwd):
    assert str(c.seq) == '03:02'
    assert c.header_len==11
    assert c.data_len==23
-    assert c._forward_buffer==b''
-    assert c._send_buffer==b''
-    assert m.writer.sent_pdu == msg_modbus_cmd_fwd
+    assert c.ifc.fwd_fifo.get()==b''
+    assert c.ifc.tx_fifo.get()==b''
+    assert m.sent_pdu == msg_modbus_cmd_fwd
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['AT_Command'] == 0
    assert m.db.stat['proxy']['Modbus_Command'] == 1
@@ -1552,9 +1542,9 @@ def test_msg_modbus_req2(config_tsun_inv1, msg_modbus_cmd_crc_err):
    assert str(c.seq) == '03:02'
    assert c.header_len==11
    assert c.data_len==23
-    assert c._forward_buffer==b''
-    assert c._send_buffer==b''
-    assert m.writer.sent_pdu==b''
+    assert c.ifc.fwd_fifo.get()==b''
+    assert c.ifc.tx_fifo.get()==b''
+    assert m.sent_pdu==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['AT_Command'] == 0
    assert m.db.stat['proxy']['Modbus_Command'] == 0
@@ -1575,8 +1565,8 @@ def test_msg_unknown_cmd_req(config_tsun_inv1, msg_unknown_cmd):
    assert str(m.seq) == '03:02'
    assert m.header_len==11
    assert m.data_len==23
-    assert m._forward_buffer==msg_unknown_cmd
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_unknown_cmd
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['AT_Command'] == 0
    assert m.db.stat['proxy']['Modbus_Command'] == 0
@@ -1596,8 +1586,8 @@ def test_msg_modbus_rsp1(config_tsun_inv1, msg_modbus_rsp):
    assert str(m.seq) == '03:03'
    assert m.header_len==11
    assert m.data_len==59
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['Modbus_Command'] == 0
    m.close()
@@ -1620,21 +1610,20 @@ def test_msg_modbus_rsp2(config_tsun_inv1, msg_modbus_rsp):
    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
    assert m.mb.err == 0
    assert m.msg_count == 1
-    assert m._forward_buffer==msg_modbus_rsp
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_modbus_rsp
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.get_db_value(Register.VERSION) == 'V4.0.10'
    assert m.new_data['inverter'] == True
    m.new_data['inverter'] = False

    m.mb.req_pend = True
-    m._forward_buffer = bytearray()
    m.append_msg(msg_modbus_rsp)
    m.read()         # read complete msg, and dispatch msg
    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
    assert m.mb.err == 0
    assert m.msg_count == 2
-    assert m._forward_buffer==msg_modbus_rsp
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_modbus_rsp
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.get_db_value(Register.VERSION) == 'V4.0.10'
    assert m.new_data['inverter'] == False

@@ -1658,20 +1647,19 @@ def test_msg_modbus_rsp3(config_tsun_inv1, msg_modbus_rsp):
    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
    assert m.mb.err == 0
    assert m.msg_count == 1
-    assert m._forward_buffer==msg_modbus_rsp
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_modbus_rsp
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.get_db_value(Register.VERSION) == 'V4.0.10'
    assert m.new_data['inverter'] == True
    m.new_data['inverter'] = False

-    m._forward_buffer = bytearray()
    m.append_msg(msg_modbus_rsp)
    m.read()         # read complete msg, and dispatch msg
    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
    assert m.mb.err == 5
    assert m.msg_count == 2
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.get_db_value(Register.VERSION) == 'V4.0.10'
    assert m.new_data['inverter'] == False

@@ -1689,8 +1677,8 @@ def test_msg_unknown_rsp(config_tsun_inv1, msg_unknown_cmd_rsp):
    assert str(m.seq) == '03:03'
    assert m.header_len==11
    assert m.data_len==59
-    assert m._forward_buffer==msg_unknown_cmd_rsp
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_unknown_cmd_rsp
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['Modbus_Command'] == 0
    m.close()
@@ -1703,8 +1691,8 @@ def test_msg_modbus_invalid(config_tsun_inv1, msg_modbus_invalid):
    m.read()         # read complete msg, and dispatch msg
    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
    assert m.msg_count == 1
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['Modbus_Command'] == 0
    m.close()
@@ -1726,8 +1714,8 @@ def test_msg_modbus_fragment(config_tsun_inv1, msg_modbus_rsp):
    m.read()         # read complete msg, and dispatch msg
    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
    assert m.msg_count == 1
-    assert m._forward_buffer==msg_modbus_rsp
-    assert m._send_buffer == b''
+    assert m.ifc.fwd_fifo.get()==msg_modbus_rsp
+    assert m.ifc.tx_fifo.get()== b''
    assert m.mb.err == 0
    assert m.modbus_elms == 20-1  # register 0x300d is unknown, so one value can't be mapped
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
@@ -1742,6 +1730,7 @@ async def test_modbus_polling(config_tsun_inv1, heartbeat_ind_msg, heartbeat_rsp
    assert asyncio.get_running_loop() == m.mb_timer.loop
    m.db.stat['proxy']['Unknown_Ctrl'] = 0
    assert m.mb_timer.tim == None
+    
    m.read()         # read complete msg, and dispatch msg
    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
    assert m.msg_count == 1
@@ -1750,28 +1739,27 @@ async def test_modbus_polling(config_tsun_inv1, heartbeat_ind_msg, heartbeat_rsp
    assert m.control == 0x4710
    assert str(m.seq) == '84:11'  # value after sending response
    assert m.data_len == 0x01
-    assert m._recv_buffer==b''
-    assert m._send_buffer==heartbeat_rsp_msg
-    assert m._forward_buffer==heartbeat_ind_msg
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==heartbeat_rsp_msg
+    assert m.ifc.fwd_fifo.get()==heartbeat_ind_msg
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0

-    m._send_buffer = bytearray(0) # clear send buffer for next test
    assert m.state == State.up
    assert isclose(m.mb_timeout, 0.5)
    assert next(m.mb_timer.exp_count) == 0
    
    await asyncio.sleep(0.5)
-    assert m.writer.sent_pdu==bytearray(b'\xa5\x17\x00\x10E\x12\x84!Ce{\x02\xb0\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x03\x30\x00\x000J\xde\x86\x15')
-    assert m._send_buffer==b''
+    assert m.sent_pdu==bytearray(b'\xa5\x17\x00\x10E\x12\x84!Ce{\x02\xb0\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x03\x30\x00\x000J\xde\x86\x15')
+    assert m.ifc.tx_fifo.get()==b''
    
    await asyncio.sleep(0.5)
-    assert m.writer.sent_pdu==bytearray(b'\xa5\x17\x00\x10E\x13\x84!Ce{\x02\xb0\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x03\x30\x00\x000J\xde\x87\x15')
-    assert m._send_buffer==b''
+    assert m.sent_pdu==bytearray(b'\xa5\x17\x00\x10E\x13\x84!Ce{\x02\xb0\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x03\x30\x00\x000J\xde\x87\x15')
+    assert m.ifc.tx_fifo.get()==b''
    m.state = State.closed
-    m.writer.sent_pdu = bytearray()
+    m.sent_pdu = bytearray()
    await asyncio.sleep(0.5)
-    assert m.writer.sent_pdu==bytearray(b'')
-    assert m._send_buffer==b''
+    assert m.sent_pdu==bytearray(b'')
+    assert m.ifc.tx_fifo.get()==b''
    assert next(m.mb_timer.exp_count) == 4
    m.close()

@@ -1780,12 +1768,16 @@ async def test_start_client_mode(config_tsun_inv1, str_test_ip):
    _ = config_tsun_inv1
    assert asyncio.get_running_loop()
    m = MemoryStream(b'')
+    m.mb_start_reg = 0x3000
+    m.mb_incr_reg = 0x00      # 4
+    m.mb_scan_len = 48
+
    assert m.state == State.init
    assert m.no_forwarding == False
    assert m.mb_timer.tim == None
    assert asyncio.get_running_loop() == m.mb_timer.loop
-    await m.send_start_cmd(get_sn_int(), str_test_ip, m.mb_first_timeout)
-    assert m.writer.sent_pdu==bytearray(b'\xa5\x17\x00\x10E\x01\x00!Ce{\x02\xb0\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x030\x00\x000J\xde\xf1\x15')
+    await m.send_start_cmd(get_sn_int(), str_test_ip, False, m.mb_first_timeout)
+    assert m.sent_pdu==bytearray(b'\xa5\x17\x00\x10E\x01\x00!Ce{\x02\xb0\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x030\x00\x000J\xde\xf1\x15')
    assert m.db.get_db_value(Register.IP_ADDRESS) == str_test_ip
    assert isclose(m.db.get_db_value(Register.POLLING_INTERVAL), 0.5)
    assert m.db.get_db_value(Register.HEARTBEAT_INTERVAL) == 120
@@ -1793,16 +1785,56 @@ async def test_start_client_mode(config_tsun_inv1, str_test_ip):
    assert m.state == State.up
    assert m.no_forwarding == True

-    assert m._send_buffer==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert isclose(m.mb_timeout, 0.5)
    assert next(m.mb_timer.exp_count) == 0
    
    await asyncio.sleep(0.5)
-    assert m.writer.sent_pdu==bytearray(b'\xa5\x17\x00\x10E\x02\x00!Ce{\x02\xb0\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x030\x00\x000J\xde\xf2\x15')
-    assert m._send_buffer==b''
+    assert m.sent_pdu==bytearray(b'\xa5\x17\x00\x10E\x02\x00!Ce{\x02\xb0\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x030\x00\x000J\xde\xf2\x15')
+    assert m.ifc.tx_fifo.get()==b''
    
    await asyncio.sleep(0.5)
-    assert m.writer.sent_pdu==bytearray(b'\xa5\x17\x00\x10E\x03\x00!Ce{\x02\xb0\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x030\x00\x000J\xde\xf3\x15')
-    assert m._send_buffer==b''
+    assert m.sent_pdu==bytearray(b'\xa5\x17\x00\x10E\x03\x00!Ce{\x02\xb0\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x030\x00\x000J\xde\xf3\x15')
+    assert m.ifc.tx_fifo.get()==b''
    assert next(m.mb_timer.exp_count) == 3
    m.close()
+
+def test_timeout(config_tsun_inv1):
+    _ = config_tsun_inv1
+    m = MemoryStream(b'')
+    assert m.state == State.init
+    assert SolarmanV5.MAX_START_TIME == m._timeout()
+    m.state = State.up
+    m.modbus_polling = True
+    assert SolarmanV5.MAX_INV_IDLE_TIME == m._timeout()
+    m.modbus_polling = False
+    assert SolarmanV5.MAX_DEF_IDLE_TIME == m._timeout()
+    m.state = State.closed
+    m.close()
+
+def test_fnc_dispatch():
+    def msg():
+        return
+    
+    _ = config_tsun_inv1
+    m = MemoryStream(b'')
+    m.switch[1] = msg
+    m.switch[2] = "msg"
+
+    _obj, _str = m.get_fnc_handler(1)
+    assert _obj == msg
+    assert _str == "'msg'"
+
+    _obj, _str = m.get_fnc_handler(2)
+    assert _obj == m.msg_unknown
+    assert _str == "'msg'"
+
+    _obj, _str = m.get_fnc_handler(3)
+    assert _obj == m.msg_unknown
+    assert _str == "'msg_unknown'"
+
+def test_timestamp():
+    m = MemoryStream(b'')
+    ts = m._timestamp()
+    ts_emu = m._emu_timestamp()
+    assert ts == ts_emu + 24*60*60
--- a/app/tests/test_solarman_emu.py
+++ b/app/tests/test_solarman_emu.py
@@ -0,0 +1,230 @@
+import pytest
+import asyncio
+from app.src.async_stream import AsyncIfcImpl, StreamPtr
+from app.src.gen3plus.solarman_v5 import SolarmanV5, SolarmanBase
+from app.src.gen3plus.solarman_emu import SolarmanEmu
+from app.src.infos import Infos, Register
+from app.tests.test_solarman import FakeIfc, MemoryStream, get_sn_int, get_sn, correct_checksum, config_tsun_inv1, msg_modbus_rsp
+from app.tests.test_infos_g3p import str_test_ip, bytes_test_ip
+
+timestamp = 0x3224c8bc
+
+class InvStream(MemoryStream):
+    def __init__(self, msg=b''):
+        super().__init__(msg)
+
+    def _emu_timestamp(self):
+        return timestamp
+
+class CldStream(SolarmanEmu):
+    def __init__(self, inv: InvStream):
+        _ifc = FakeIfc()
+        _ifc.remote.stream = inv
+        super().__init__(('test.local', 1234), _ifc, server_side=False, client_mode=False)
+        self.__msg = b''
+        self.__msg_len = 0
+        self.__offs = 0
+        self.msg_count = 0
+        self.msg_recvd = []
+
+    def _emu_timestamp(self):
+        return timestamp
+    
+    def append_msg(self, msg):
+        self.__msg += msg
+        self.__msg_len += len(msg)    
+
+    def _read(self) -> int:
+        copied_bytes = 0
+        try:    
+            if (self.__offs < self.__msg_len):
+                self.ifc.rx_fifo += self.__msg[self.__offs:]
+                copied_bytes = self.__msg_len - self.__offs
+                self.__offs = self.__msg_len
+        except Exception:
+            pass   # ignore exceptions here
+        return copied_bytes
+
+    def _SolarmanBase__flush_recv_msg(self) -> None:
+        self.msg_recvd.append(
+            {
+                'control': self.control,
+                'seq': str(self.seq),
+                'data_len': self.data_len
+            }
+        )
+        super()._SolarmanBase__flush_recv_msg()
+        self.msg_count += 1
+
+@pytest.fixture
+def device_ind_msg(bytes_test_ip): # 0x4110
+    msg  = b'\xa5\xd4\x00\x10\x41\x00\x01' +get_sn()  +b'\x02\xbc\xc8\x24\x32'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x05\x3c\x78\x01\x00\x01\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' + bytes_test_ip
+    msg += b'\x0f\x00\x01\xb0'
+    msg += b'\x02\x0f\x00\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xfe\xfe\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += correct_checksum(msg)
+    msg += b'\x15'
+    return msg
+
+@pytest.fixture
+def inverter_ind_msg():  # 0x4210
+    msg  = b'\xa5\x99\x01\x10\x42\x00\x01' +get_sn()  +b'\x01\xb0\x02\xbc\xc8'
+    msg += b'\x24\x32\x3c\x00\x00\x00\xa0\x47\xe4\x33\x01\x00\x03\x08\x00\x00'
+    msg += b'\x59\x31\x37\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x31'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x01\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x40\x10\x08\xc8\x00\x49\x13\x8d\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x04\x00'
+    msg += b'\x04\x00\x00\x01\xff\xff\x00\x01\x00\x06\x00\x68\x00\x68\x05\x00'
+    msg += b'\x09\xcd\x07\xb6\x13\x9c\x13\x24\x00\x01\x07\xae\x04\x0f\x00\x41'
+    msg += b'\x00\x0f\x0a\x64\x0a\x64\x00\x06\x00\x06\x09\xf6\x12\x8c\x12\x8c'
+    msg += b'\x00\x10\x00\x10\x14\x52\x14\x52\x00\x10\x00\x10\x01\x51\x00\x05'
+    msg += b'\x00\x00\x00\x01\x13\x9c\x0f\xa0\x00\x4e\x00\x66\x03\xe8\x04\x00'
+    msg += b'\x09\xce\x07\xa8\x13\x9c\x13\x26\x00\x00\x00\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x04\x00\x04\x00\x00\x00\x00\x00\xff\xff\x00\x00'
+    msg += b'\x00\x00\x00\x00'
+    msg += correct_checksum(msg)
+    msg += b'\x15'
+    return msg
+
+@pytest.fixture
+def inverter_rsp_msg():  # 0x1210
+    msg  = b'\xa5\x0a\x00\x10\x12\x02\02' +get_sn()  +b'\x01\x01'
+    msg += b'\x00\x00\x00\x00'
+    msg += b'\x3c\x00\x00\x00'
+    msg += correct_checksum(msg)
+    msg += b'\x15'
+    return msg
+
+@pytest.fixture
+def heartbeat_ind():
+    msg  = b'\xa5\x01\x00\x10G\x00\x01\x00\x00\x00\x00\x00Y\x15'
+    return msg
+
+def test_emu_init_close():
+    # received a message with wrong start byte plus an valid message
+    # the complete receive buffer must be cleared to 
+    # find the next valid message
+    inv = InvStream()
+    cld = CldStream(inv)
+    cld.close()
+
+
+@pytest.mark.asyncio
+async def test_emu_start(config_tsun_inv1, msg_modbus_rsp, str_test_ip, device_ind_msg):
+    _ = config_tsun_inv1
+    assert asyncio.get_running_loop()
+    inv = InvStream(msg_modbus_rsp)
+
+    assert asyncio.get_running_loop() == inv.mb_timer.loop
+    await inv.send_start_cmd(get_sn_int(), str_test_ip, True, inv.mb_first_timeout)
+    inv.read()         # read complete msg, and dispatch msg
+    assert not inv.header_valid  # must be invalid, since msg was handled and buffer flushed
+    assert inv.msg_count == 1
+    assert inv.control == 0x1510
+
+    cld = CldStream(inv)
+    cld.ifc.update_header_cb(inv.ifc.fwd_fifo.peek())
+    assert inv.ifc.fwd_fifo.peek() == device_ind_msg
+    cld.close()
+
+def test_snd_hb(config_tsun_inv1, heartbeat_ind):
+    _ = config_tsun_inv1
+    inv = InvStream()
+    cld = CldStream(inv)
+
+    # await inv.send_start_cmd(get_sn_int(), str_test_ip, False, inv.mb_first_timeout)
+    cld.send_heartbeat_cb(0)
+    assert cld.ifc.tx_fifo.peek() == heartbeat_ind
+    cld.close()
+
+@pytest.mark.asyncio
+async def test_snd_inv_data(config_tsun_inv1, inverter_ind_msg, inverter_rsp_msg):
+    _ = config_tsun_inv1
+    inv = InvStream()
+    inv.db.set_db_def_value(Register.INVERTER_STATUS, 1)
+    inv.db.set_db_def_value(Register.DETECT_STATUS_1, 2)
+    inv.db.set_db_def_value(Register.VERSION, 'V4.0.10')
+    inv.db.set_db_def_value(Register.GRID_VOLTAGE, 224.8)
+    inv.db.set_db_def_value(Register.GRID_CURRENT, 0.73)
+    inv.db.set_db_def_value(Register.GRID_FREQUENCY, 50.05)
+    assert asyncio.get_running_loop() == inv.mb_timer.loop
+    await inv.send_start_cmd(get_sn_int(), str_test_ip, False, inv.mb_first_timeout)
+    inv.db.set_db_def_value(Register.DATA_UP_INTERVAL, 17)  # set test value
+
+    cld = CldStream(inv)
+    cld.time_ofs = 0x33e447a0
+    cld.last_sync = cld._emu_timestamp() - 60
+    cld.pkt_cnt = 0x802
+    assert cld.data_up_inv == 17  # check test value
+    cld.data_up_inv = 0.1         # speedup test first data msg
+    cld._init_new_client_conn()
+    cld.data_up_inv = 0.5         # timeout for second data msg
+    await asyncio.sleep(0.2)
+    assert cld.ifc.tx_fifo.get() == inverter_ind_msg
+
+    cld.append_msg(inverter_rsp_msg)
+    cld.read()         # read complete msg, and dispatch msg
+
+    assert not cld.header_valid  # must be invalid, since msg was handled and buffer flushed
+    assert cld.msg_count == 1
+    assert cld.header_len==11
+    assert cld.snr == 2070233889
+    assert cld.unique_id == '2070233889'
+    assert cld.msg_recvd[0]['control']==0x1210
+    assert cld.msg_recvd[0]['seq']=='02:02'
+    assert cld.msg_recvd[0]['data_len']==0x0a
+    assert '02b0' == cld.db.get_db_value(Register.SENSOR_LIST, None)
+    assert cld.db.stat['proxy']['Unknown_Msg'] == 0
+
+    cld.close()
+
+@pytest.mark.asyncio
+async def test_rcv_invalid(config_tsun_inv1, inverter_ind_msg, inverter_rsp_msg):
+    _ = config_tsun_inv1
+    inv = InvStream()
+    assert asyncio.get_running_loop() == inv.mb_timer.loop
+    await inv.send_start_cmd(get_sn_int(), str_test_ip, False, inv.mb_first_timeout)
+    inv.db.set_db_def_value(Register.DATA_UP_INTERVAL, 17)  # set test value
+
+    cld = CldStream(inv)
+    cld._init_new_client_conn()
+
+    cld.append_msg(inverter_ind_msg)
+    cld.read()         # read complete msg, and dispatch msg
+
+    assert not cld.header_valid  # must be invalid, since msg was handled and buffer flushed
+    assert cld.msg_count == 1
+    assert cld.header_len==11
+    assert cld.snr == 2070233889
+    assert cld.unique_id == '2070233889'
+    assert cld.msg_recvd[0]['control']==0x4210
+    assert cld.msg_recvd[0]['seq']=='00:01'
+    assert cld.msg_recvd[0]['data_len']==0x199
+    assert '02b0' == cld.db.get_db_value(Register.SENSOR_LIST, None)
+    assert cld.db.stat['proxy']['Unknown_Msg'] == 1
+
+
+    cld.close()
--- a/app/tests/test_talent.py
+++ b/app/tests/test_talent.py
@@ -1,6 +1,7 @@
 # test_with_pytest.py
 import pytest, logging, asyncio
 from math import isclose
+from app.src.async_stream import AsyncIfcImpl, StreamPtr
 from app.src.gen3.talent import Talent, Control
 from app.src.config import Config
 from app.src.infos import Infos, Register
@@ -15,22 +16,21 @@ Infos.static_init()

 tracer = logging.getLogger('tracer')

-
-class Writer():
+class FakeIfc(AsyncIfcImpl):
    def __init__(self):
-        self.sent_pdu = b''
-
-    def write(self, pdu: bytearray):
-        self.sent_pdu = pdu
+        super().__init__()
+        self.remote = StreamPtr(None)

 class MemoryStream(Talent):
    def __init__(self, msg, chunks = (0,), server_side: bool = True):
-        super().__init__(server_side)
+        self.ifc = FakeIfc()
+        super().__init__(('test.local', 1234), self.ifc, server_side)
        if server_side:
            self.mb.timeout = 0.4   # overwrite for faster testing
        self.mb_first_timeout = 0.5
        self.mb_timeout = 0.5
-        self.writer = Writer()
+        self.sent_pdu = b''
+        self.ifc.tx_fifo.reg_trigger(self.write_cb)
        self.__msg = msg
        self.__msg_len = len(msg)
        self.__chunks = chunks
@@ -39,9 +39,11 @@ class MemoryStream(Talent):
        self.msg_count = 0
        self.addr = 'Test: SrvSide'
        self.send_msg_ofs = 0
-        self.test_exception_async_write = False
        self.msg_recvd = []
-        self.remote_stream = None
+
+    def write_cb(self):
+        self.sent_pdu = self.ifc.tx_fifo.get()
+

    def append_msg(self, msg):
        self.__msg += msg
@@ -54,11 +56,11 @@ class MemoryStream(Talent):
                chunk_len = self.__chunks[self.__chunk_idx]
                self.__chunk_idx += 1
                if chunk_len!=0:
-                    self._recv_buffer += self.__msg[self.__offs:chunk_len]
+                    self.ifc.rx_fifo += self.__msg[self.__offs:chunk_len]
                    copied_bytes = chunk_len - self.__offs
                    self.__offs = chunk_len
                else:
-                    self._recv_buffer += self.__msg[self.__offs:]
+                    self.ifc.rx_fifo += self.__msg[self.__offs:]
                    copied_bytes = self.__msg_len - self.__offs
                    self.__offs = self.__msg_len
        except Exception:
@@ -73,8 +75,8 @@ class MemoryStream(Talent):
    
    def createClientStream(self, msg, chunks = (0,)):
        c = MemoryStream(msg, chunks, False)
-        self.remote_stream = c
-        c. remote_stream = self
+        self.ifc.remote.stream = c
+        c.ifc.remote.stream = self
        return c

    def _Talent__flush_recv_msg(self) -> None:
@@ -91,22 +93,26 @@ class MemoryStream(Talent):

        self.msg_count += 1
    
-    async def async_write(self, headline=''):
-        if self.test_exception_async_write:
-            raise RuntimeError("Peer closed.")
-
    

@pytest.fixture
 def msg_contact_info(): # Contact Info message
-    Config.act_config = {'tsun':{'enabled': True}}
    return b'\x00\x00\x00\x2c\x10R170000000000001\x91\x00\x08solarhub\x0fsolarhub\x40123456'

+@pytest.fixture
+def msg_contact_info_empty(): # Contact Info message with empty string
+    return b'\x00\x00\x00\x15\x10R170000000000001\x91\x00\x00\x00'
+
@pytest.fixture
 def msg_contact_info_long_id():  # Contact Info message with longer ID
    Config.act_config = {'tsun':{'enabled': True}}
    return b'\x00\x00\x00\x2d\x11R1700000000000011\x91\x00\x08solarhub\x0fsolarhub\x40123456'

+
+@pytest.fixture
+def msg_contact_info_broken():  # Contact Info message with invalid string coding
+    return b'\x00\x00\x00\x2a\x10R170000000000001\x91\x00solarhubsolarhub\x40123456'
+
@pytest.fixture
 def msg2_contact_info(): # two Contact Info messages
    return b'\x00\x00\x00\x2c\x10R170000000000001\x91\x00\x08solarhub\x0fsolarhub\x40123456\x00\x00\x00\x2c\x10R170000000000002\x91\x00\x08solarhub\x0fsolarhub\x40123456'
@@ -728,6 +734,7 @@ def multiple_recv_buf(): # There are three message in the buffer, but the second
    return msg

 def test_read_message(msg_contact_info):
+    Config.act_config = {'tsun':{'enabled': True}}
    m = MemoryStream(msg_contact_info, (0,))
    m.read()         # read complete msg, and dispatch msg
    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
@@ -738,7 +745,9 @@ def test_read_message(msg_contact_info):
    assert m.msg_id==0 
    assert m.header_len==23
    assert m.data_len==25
-    assert m._forward_buffer==b''
+    assert m.ifc.rx_get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
    m.close()

 def test_read_message_twice(config_no_tsun_inv1, msg_inverter_ind):
@@ -758,7 +767,7 @@ def test_read_message_twice(config_no_tsun_inv1, msg_inverter_ind):
    assert m.msg_recvd[1]['data_len']==120
    assert m.id_str == b"R170000000000001" 
    assert m.unique_id == 'R170000000000001'
-    assert m._forward_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
    m.close()
 
 def test_read_message_long_id(msg_contact_info_long_id):
@@ -782,6 +791,7 @@ def test_read_message_long_id(msg_contact_info_long_id):
    

 def test_read_message_in_chunks(msg_contact_info):
+    Config.act_config = {'tsun':{'enabled': True}}
    m = MemoryStream(msg_contact_info, (4,23,0))
    m.read()        # read 4 bytes, header incomplere
    assert not m.header_valid  # must be invalid, since header not complete
@@ -801,6 +811,7 @@ def test_read_message_in_chunks(msg_contact_info):
    m.close()
    
 def test_read_message_in_chunks2(msg_contact_info):
+    Config.act_config = {'tsun':{'enabled': True}}
    m = MemoryStream(msg_contact_info, (4,10,0))
    m.read()        # read 4 bytes, header incomplere
    assert not m.header_valid
@@ -841,15 +852,87 @@ def test_read_two_messages(config_tsun_allow_all, msg2_contact_info,msg_contact_
    assert m.msg_recvd[1]['msg_id']==0
    assert m.msg_recvd[1]['header_len']==23
    assert m.msg_recvd[1]['data_len']==25
-    assert m._forward_buffer==b''
-    assert m._send_buffer==msg_contact_rsp + msg_contact_rsp2
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==msg_contact_rsp + msg_contact_rsp2
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0

-    m._send_buffer = bytearray(0) # clear send buffer for next test    
+    m.ifc.tx_clear() # clear send buffer for next test    
    m.contact_name = b'solarhub'
    m.contact_mail = b'solarhub@123456'
    m._init_new_client_conn()
-    assert m._send_buffer==b'\x00\x00\x00,\x10R170000000000002\x91\x00\x08solarhub\x0fsolarhub@123456'
+    assert m.ifc.tx_fifo.get()==b'\x00\x00\x00,\x10R170000000000002\x91\x00\x08solarhub\x0fsolarhub@123456'
+    m.close()
+
+def test_conttact_req(config_tsun_allow_all, msg_contact_info, msg_contact_rsp):
+    _ = config_tsun_allow_all
+    m = MemoryStream(msg_contact_info, (0,))
+    m.read()         # read complete msg, and dispatch msg
+    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
+    assert m.msg_count == 1
+    assert m.id_str == b"R170000000000001" 
+    assert m.contact_name == b'solarhub'
+    assert m.contact_mail == b'solarhub@123456'
+    assert m.unique_id == 'R170000000000001'
+    assert int(m.ctrl)==145
+    assert m.msg_id==0 
+    assert m.header_len==23
+    assert m.data_len==25
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==msg_contact_rsp
+    m.close()
+
+def test_contact_broken_req(config_tsun_allow_all, msg_contact_info_broken, msg_contact_rsp):
+    _ = config_tsun_allow_all
+    m = MemoryStream(msg_contact_info_broken, (0,))
+    m.read()         # read complete msg, and dispatch msg
+    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
+    assert m.msg_count == 1
+    assert m.id_str == b"R170000000000001" 
+    assert m.contact_name == b''
+    assert m.contact_mail == b''
+    assert m.unique_id == 'R170000000000001'
+    assert int(m.ctrl)==145
+    assert m.msg_id==0 
+    assert m.header_len==23
+    assert m.data_len==23
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==msg_contact_rsp
+    m.close()
+
+def test_conttact_req(config_tsun_allow_all, msg_contact_info, msg_contact_rsp):
+    _ = config_tsun_allow_all
+    m = MemoryStream(msg_contact_info, (0,))
+    m.read()         # read complete msg, and dispatch msg
+    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
+    assert m.msg_count == 1
+    assert m.id_str == b"R170000000000001" 
+    assert m.contact_name == b'solarhub'
+    assert m.contact_mail == b'solarhub@123456'
+    assert m.unique_id == 'R170000000000001'
+    assert int(m.ctrl)==145
+    assert m.msg_id==0 
+    assert m.header_len==23
+    assert m.data_len==25
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==msg_contact_rsp
+    m.close()
+
+def test_contact_broken_req(config_tsun_allow_all, msg_contact_info_broken, msg_contact_rsp):
+    _ = config_tsun_allow_all
+    m = MemoryStream(msg_contact_info_broken, (0,))
+    m.read()         # read complete msg, and dispatch msg
+    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
+    assert m.msg_count == 1
+    assert m.id_str == b"R170000000000001" 
+    assert m.contact_name == b''
+    assert m.contact_mail == b''
+    assert m.unique_id == 'R170000000000001'
+    assert int(m.ctrl)==145
+    assert m.msg_id==0 
+    assert m.header_len==23
+    assert m.data_len==23
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==msg_contact_rsp
    m.close()

 def test_msg_contact_resp(config_tsun_inv1, msg_contact_rsp):
@@ -867,8 +950,8 @@ def test_msg_contact_resp(config_tsun_inv1, msg_contact_rsp):
    assert m.msg_id==0
    assert m.header_len==23
    assert m.data_len==1
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -887,8 +970,8 @@ def test_msg_contact_resp_2(config_tsun_inv1, msg_contact_rsp):
    assert m.msg_id==0
    assert m.header_len==23
    assert m.data_len==1
-    assert m._forward_buffer==msg_contact_rsp
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_contact_rsp
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -907,8 +990,8 @@ def test_msg_contact_resp_3(config_tsun_inv1, msg_contact_rsp):
    assert m.msg_id==0
    assert m.header_len==23
    assert m.data_len==1
-    assert m._forward_buffer==msg_contact_rsp
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_contact_rsp
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -925,8 +1008,8 @@ def test_msg_contact_invalid(config_tsun_inv1, msg_contact_invalid):
    assert m.msg_id==0
    assert m.header_len==23
    assert m.data_len==1
-    assert m._forward_buffer==msg_contact_invalid
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_contact_invalid
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 1
    m.close()

@@ -946,8 +1029,8 @@ def test_msg_get_time(config_tsun_inv1, msg_get_time):
    assert m.ts_offset==0
    assert m.data_len==0
    assert m.state==State.pend
-    assert m._forward_buffer==msg_get_time
-    assert m._send_buffer==b'\x00\x00\x00\x1b\x10R170000000000001\x91"\x00\x00\x01\x89\xc6,_\x00'
+    assert m.ifc.fwd_fifo.get()==msg_get_time
+    assert m.ifc.tx_fifo.get()==b'\x00\x00\x00\x1b\x10R170000000000001\x91"\x00\x00\x01\x89\xc6,_\x00'
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -967,8 +1050,8 @@ def test_msg_get_time_autark(config_no_tsun_inv1, msg_get_time):
    assert m.ts_offset==0
    assert m.data_len==0
    assert m.state==State.received
-    assert m._forward_buffer==b''
-    assert m._send_buffer==bytearray(b'\x00\x00\x00\x1b\x10R170000000000001\x91"\x00\x00\x01\x89\xc6,_\x00')
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==bytearray(b'\x00\x00\x00\x1b\x10R170000000000001\x91"\x00\x00\x01\x89\xc6,_\x00')
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -978,7 +1061,7 @@ def test_msg_time_resp(config_tsun_inv1, msg_time_rsp):
    m = MemoryStream(msg_time_rsp, (0,), False)
    s = MemoryStream(b'', (0,), True)
    assert s.ts_offset==0
-    m.remote_stream = s
+    m.ifc.remote.stream = s
    m.db.stat['proxy']['Unknown_Ctrl'] = 0
    m.read()         # read complete msg, and dispatch msg
    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
@@ -991,10 +1074,10 @@ def test_msg_time_resp(config_tsun_inv1, msg_time_rsp):
    assert m.ts_offset==3600000
    assert s.ts_offset==3600000
    assert m.data_len==8
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
-    m.remote_stream = None
+    m.ifc.remote.stream = None
    s.close()
    m.close()

@@ -1012,8 +1095,8 @@ def test_msg_time_resp_autark(config_no_tsun_inv1, msg_time_rsp):
    assert m.header_len==23
    assert m.ts_offset==3600000
    assert m.data_len==8
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -1031,8 +1114,8 @@ def test_msg_time_inv_resp(config_tsun_inv1, msg_time_rsp_inv):
    assert m.header_len==23
    assert m.ts_offset==0
    assert m.data_len==4
-    assert m._forward_buffer==msg_time_rsp_inv
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_time_rsp_inv
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -1050,8 +1133,8 @@ def test_msg_time_invalid(config_tsun_inv1, msg_time_invalid):
    assert m.header_len==23
    assert m.ts_offset==0
    assert m.data_len==0
-    assert m._forward_buffer==msg_time_invalid
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_time_invalid
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 1
    m.close()

@@ -1069,8 +1152,8 @@ def test_msg_time_invalid_autark(config_no_tsun_inv1, msg_time_invalid):
    assert m.ts_offset==0
    assert m.header_len==23
    assert m.data_len==0
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 1
    m.close()

@@ -1093,8 +1176,8 @@ def test_msg_act_time(config_no_modbus_poll, msg_act_time, msg_act_time_ack):
    assert m.header_len==23
    assert m.data_len==9
    assert m.state == State.up
-    assert m._forward_buffer==msg_act_time
-    assert m._send_buffer==msg_act_time_ack
+    assert m.ifc.fwd_fifo.get()==msg_act_time
+    assert m.ifc.tx_fifo.get()==msg_act_time_ack
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert 125 == m.db.get_db_value(Register.POLLING_INTERVAL, 0)
    m.close()
@@ -1117,8 +1200,8 @@ def test_msg_act_time2(config_tsun_inv1, msg_act_time, msg_act_time_ack):
    assert m.ts_offset==0
    assert m.header_len==23
    assert m.data_len==9
-    assert m._forward_buffer==msg_act_time
-    assert m._send_buffer==msg_act_time_ack
+    assert m.ifc.fwd_fifo.get()==msg_act_time
+    assert m.ifc.tx_fifo.get()==msg_act_time_ack
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert 123 == m.db.get_db_value(Register.POLLING_INTERVAL, 0)
    m.close()
@@ -1138,8 +1221,8 @@ def test_msg_act_time_ofs(config_tsun_inv1, msg_act_time, msg_act_time_ofs, msg_
    assert m.ts_offset==3600
    assert m.header_len==23
    assert m.data_len==9
-    assert m._forward_buffer==msg_act_time_ofs
-    assert m._send_buffer==msg_act_time_ack
+    assert m.ifc.fwd_fifo.get()==msg_act_time_ofs
+    assert m.ifc.tx_fifo.get()==msg_act_time_ack
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -1158,8 +1241,8 @@ def test_msg_act_time_ofs2(config_tsun_inv1, msg_act_time, msg_act_time_ofs, msg
    assert m.ts_offset==-3600
    assert m.header_len==23
    assert m.data_len==9
-    assert m._forward_buffer==msg_act_time
-    assert m._send_buffer==msg_act_time_ack
+    assert m.ifc.fwd_fifo.get()==msg_act_time
+    assert m.ifc.tx_fifo.get()==msg_act_time_ack
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -1178,8 +1261,8 @@ def test_msg_act_time_autark(config_no_tsun_inv1, msg_act_time, msg_act_time_ack
    assert m.ts_offset==0
    assert m.header_len==23
    assert m.data_len==9
-    assert m._forward_buffer==b''
-    assert m._send_buffer==msg_act_time_ack
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==msg_act_time_ack
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -1196,8 +1279,8 @@ def test_msg_act_time_ack(config_tsun_inv1, msg_act_time_ack):
    assert m.msg_id==153
    assert m.header_len==23
    assert m.data_len==1
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -1214,8 +1297,8 @@ def test_msg_act_time_cmd(config_tsun_inv1, msg_act_time_cmd):
    assert m.msg_id==153
    assert m.header_len==23
    assert m.data_len==1
-    assert m._forward_buffer==msg_act_time_cmd
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_act_time_cmd
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 1
    m.close()

@@ -1232,8 +1315,8 @@ def test_msg_act_time_inv(config_tsun_inv1, msg_act_time_inv):
    assert m.msg_id==153
    assert m.header_len==23
    assert m.data_len==8
-    assert m._forward_buffer==msg_act_time_inv
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_act_time_inv
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -1251,12 +1334,12 @@ def test_msg_cntrl_ind(config_tsun_inv1, msg_controller_ind, msg_controller_ind_
    assert m.header_len==23
    assert m.data_len==284
    m.ts_offset = 0
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_controller_ind
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.peek()==msg_controller_ind
    m.ts_offset = -4096
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_controller_ind_ts_offs
-    assert m._send_buffer==msg_controller_ack
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.get()==msg_controller_ind_ts_offs
+    assert m.ifc.tx_fifo.get()==msg_controller_ack
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -1273,8 +1356,8 @@ def test_msg_cntrl_ack(config_tsun_inv1, msg_controller_ack):
    assert m.msg_id==113
    assert m.header_len==23
    assert m.data_len==1
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -1292,12 +1375,12 @@ def test_msg_cntrl_invalid(config_tsun_inv1, msg_controller_invalid):
    assert m.header_len==23
    assert m.data_len==1
    m.ts_offset = 0
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_controller_invalid
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.peek()==msg_controller_invalid
    m.ts_offset = -4096
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_controller_invalid
-    assert m._send_buffer==b''
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.get()==msg_controller_invalid
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 1
    m.close()

@@ -1316,12 +1399,12 @@ def test_msg_inv_ind(config_tsun_inv1, msg_inverter_ind, msg_inverter_ind_ts_off
    assert m.header_len==23
    assert m.data_len==120
    m.ts_offset = 0
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_inverter_ind
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.peek()==msg_inverter_ind
    m.ts_offset = +256
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_inverter_ind_ts_offs
-    assert m._send_buffer==msg_inverter_ack
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.get()==msg_inverter_ind_ts_offs
+    assert m.ifc.tx_fifo.get()==msg_inverter_ack
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -1343,9 +1426,9 @@ def test_msg_inv_ind1(config_tsun_inv1, msg_inverter_ind2, msg_inverter_ind_ts_o
    assert m.header_len==23
    assert m.data_len==1263
    m.ts_offset = 0
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_inverter_ind2
-    assert m._send_buffer==msg_inverter_ack
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.get()==msg_inverter_ind2
+    assert m.ifc.tx_fifo.get()==msg_inverter_ack
    assert m.db.get_db_value(Register.TS_GRID) == 1691243349
    m.close()

@@ -1367,9 +1450,9 @@ def test_msg_inv_ind2(config_tsun_inv1, msg_inverter_ind_new, msg_inverter_ind_t
    assert m.header_len==23
    assert m.data_len==1165
    m.ts_offset = 0
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_inverter_ind_new
-    assert m._send_buffer==msg_inverter_ack
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.get()==msg_inverter_ind_new
+    assert m.ifc.tx_fifo.get()==msg_inverter_ack
    assert m.db.get_db_value(Register.INVERTER_STATUS) == None
    assert m.db.get_db_value(Register.TS_GRID) == None
    m.db.db['grid'] = {'Output_Power': 100}
@@ -1395,10 +1478,10 @@ def test_msg_inv_ind3(config_tsun_inv1, msg_inverter_ind_0w, msg_inverter_ack):
    assert m.header_len==23
    assert m.data_len==1263
    m.ts_offset = 0
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_inverter_ind_0w
-    assert m._send_buffer==msg_inverter_ack
-    assert m.db.get_db_value(Register.INVERTER_STATUS) == None
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.get()==msg_inverter_ind_0w
+    assert m.ifc.tx_fifo.get()==msg_inverter_ack
+    assert m.db.get_db_value(Register.INVERTER_STATUS) == 1
    assert isclose(m.db.db['grid']['Output_Power'], 0.5)
    m.close()
    assert m.db.get_db_value(Register.INVERTER_STATUS) == 0
@@ -1419,8 +1502,8 @@ def test_msg_inv_ack(config_tsun_inv1, msg_inverter_ack):
    assert m.msg_id==4
    assert m.header_len==23
    assert m.data_len==1
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -1438,12 +1521,12 @@ def test_msg_inv_invalid(config_tsun_inv1, msg_inverter_invalid):
    assert m.header_len==23
    assert m.data_len==1
    m.ts_offset = 0
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_inverter_invalid
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.peek()==msg_inverter_invalid
    m.ts_offset = 256
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_inverter_invalid
-    assert m._send_buffer==b''
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.get()==msg_inverter_invalid
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 1
    m.close()

@@ -1462,12 +1545,12 @@ def test_msg_ota_req(config_tsun_inv1, msg_ota_req):
    assert m.header_len==23
    assert m.data_len==259
    m.ts_offset = 0
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_ota_req
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.peek()==msg_ota_req
    m.ts_offset = 4096
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_ota_req
-    assert m._send_buffer==b''
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.get()==msg_ota_req
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['OTA_Start_Msg'] == 1
    m.close()
@@ -1489,12 +1572,12 @@ def test_msg_ota_ack(config_tsun_inv1, msg_ota_ack):
    assert m.header_len==23
    assert m.data_len==1
    m.ts_offset = 0
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_ota_ack
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.peek()==msg_ota_ack
    m.ts_offset = 256
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_ota_ack
-    assert m._send_buffer==b''
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.get()==msg_ota_ack
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['OTA_Start_Msg'] == 0
    m.close()
@@ -1514,12 +1597,12 @@ def test_msg_ota_invalid(config_tsun_inv1, msg_ota_invalid):
    assert m.header_len==23
    assert m.data_len==1
    m.ts_offset = 0
-    m._update_header(m._forward_buffer)
-    assert m._forward_buffer==msg_ota_invalid
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.fwd_fifo.peek()==msg_ota_invalid
    m.ts_offset = 4096
-    assert m._forward_buffer==msg_ota_invalid
-    m._update_header(m._forward_buffer)
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_ota_invalid
+    m._update_header(m.ifc.fwd_fifo.peek())
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 1
    assert m.db.stat['proxy']['OTA_Start_Msg'] == 0
    m.close()
@@ -1537,8 +1620,8 @@ def test_msg_unknown(config_tsun_inv1, msg_unknown):
    assert m.msg_id==23
    assert m.header_len==23
    assert m.data_len==4
-    assert m._forward_buffer==msg_unknown
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_unknown
+    assert m.ifc.tx_fifo.get()==b''
    assert 1 == m.db.stat['proxy']['Unknown_Msg']
    m.close()

@@ -1558,9 +1641,9 @@ def test_ctrl_byte():

    
 def test_msg_iterator():
-    m1 = Talent(server_side=True)
-    m2 = Talent(server_side=True)
-    m3 = Talent(server_side=True)
+    m1 = Talent(('test1.local', 1234), ifc=AsyncIfcImpl(), server_side=True)
+    m2 = Talent(('test2.local', 1234), ifc=AsyncIfcImpl(), server_side=True)
+    m3 = Talent(('test3.local', 1234), ifc=AsyncIfcImpl(), server_side=True)
    m3.close()
    del m3
    test1 = 0
@@ -1662,12 +1745,12 @@ def test_msg_modbus_req(config_tsun_inv1, msg_modbus_cmd):
    assert c.msg_id==119
    assert c.header_len==23
    assert c.data_len==13
-    assert c._forward_buffer==b''
-    assert c._send_buffer==b''
+    assert c.ifc.fwd_fifo.get()==b''
+    assert c.ifc.tx_fifo.get()==b''
    assert m.id_str == b"R170000000000001" 
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
-    assert m.writer.sent_pdu == msg_modbus_cmd
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.sent_pdu == msg_modbus_cmd
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['Modbus_Command'] == 1
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
@@ -1692,12 +1775,12 @@ def test_msg_modbus_req2(config_tsun_inv1, msg_modbus_cmd):
    assert c.msg_id==119
    assert c.header_len==23
    assert c.data_len==13
-    assert c._forward_buffer==b''
-    assert c._send_buffer==b''
+    assert c.ifc.fwd_fifo.get()==b''
+    assert c.ifc.tx_fifo.get()==b''
    assert m.id_str == b"R170000000000001" 
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
-    assert m.writer.sent_pdu == b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.sent_pdu == b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['Modbus_Command'] == 1
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
@@ -1721,11 +1804,11 @@ def test_msg_modbus_req3(config_tsun_inv1, msg_modbus_cmd_crc_err):
    assert c.msg_id==119
    assert c.header_len==23
    assert c.data_len==13
-    assert c._forward_buffer==b''
-    assert c._send_buffer==b''
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
-    assert m.writer.sent_pdu ==b''
+    assert c.ifc.fwd_fifo.get()==b''
+    assert c.ifc.tx_fifo.get()==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
+    assert m.sent_pdu ==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['Modbus_Command'] == 0
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 1
@@ -1746,8 +1829,8 @@ def test_msg_modbus_rsp1(config_tsun_inv1, msg_modbus_rsp):
    assert m.msg_id==119
    assert m.header_len==23
    assert m.data_len==13
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['Modbus_Command'] == 0
    m.close()
@@ -1768,8 +1851,8 @@ def test_msg_modbus_cloud_rsp(config_tsun_inv1, msg_modbus_rsp):
    assert m.msg_id==119
    assert m.header_len==23
    assert m.data_len==13
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Msg'] == 1
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['Modbus_Command'] == 0
@@ -1796,8 +1879,8 @@ def test_msg_modbus_rsp2(config_tsun_inv1, msg_modbus_rsp20):
    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
    assert m.mb.err == 5
    assert m.msg_count == 2
-    assert m._forward_buffer==msg_modbus_rsp20
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_modbus_rsp20
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.db == {'collector': {'Serial_Number': 'R170000000000001'}, 'inverter': {'Version': 'V5.1.09', 'Rated_Power': 300}, 'grid': {'Timestamp': m._utc(), 'Voltage': 225.9, 'Current': 0.41, 'Frequency': 49.99, 'Output_Power': 94.8}, 'env': {'Inverter_Temp': 22}, 'input': {'Timestamp': m._utc(), 'pv1': {'Voltage': 0.8, 'Current': 0.0, 'Power': 0.0}, 'pv2': {'Voltage': 34.5, 'Current': 2.89, 'Power': 99.8}, 'pv3': {'Voltage': 0.0, 'Current': 0.0, 'Power': 0.0}, 'pv4': {'Voltage': 0.0, 'Current': 0.0, 'Power': 0.0}}}
    assert m.db.get_db_value(Register.VERSION) == 'V5.1.09'
    assert m.db.get_db_value(Register.TS_GRID) == m._utc()
@@ -1826,8 +1909,8 @@ def test_msg_modbus_rsp3(config_tsun_inv1, msg_modbus_rsp21):
    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
    assert m.mb.err == 5
    assert m.msg_count == 2
-    assert m._forward_buffer==msg_modbus_rsp21
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_modbus_rsp21
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.db == {'collector': {'Serial_Number': 'R170000000000001'}, 'inverter': {'Version': 'V5.1.0E', 'Rated_Power': 300}, 'grid': {'Timestamp': m._utc(), 'Voltage': 225.9, 'Current': 0.41, 'Frequency': 49.99, 'Output_Power': 94.8}, 'env': {'Inverter_Temp': 22}, 'input': {'Timestamp': m._utc(), 'pv1': {'Voltage': 0.8, 'Current': 0.0, 'Power': 0.0}, 'pv2': {'Voltage': 34.5, 'Current': 2.89, 'Power': 99.8}, 'pv3': {'Voltage': 0.0, 'Current': 0.0, 'Power': 0.0}, 'pv4': {'Voltage': 0.0, 'Current': 0.0, 'Power': 0.0}}}
    assert m.db.get_db_value(Register.VERSION) == 'V5.1.0E'
    assert m.db.get_db_value(Register.TS_GRID) == m._utc()
@@ -1855,9 +1938,9 @@ def test_msg_modbus_rsp4(config_tsun_inv1, msg_modbus_rsp21):
    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
    assert m.mb.err == 0
    assert m.msg_count == 1
-    assert m._forward_buffer==msg_modbus_rsp21
+    assert m.ifc.fwd_fifo.get()==msg_modbus_rsp21
    assert m.modbus_elms == 19
-    assert m._send_buffer==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.db == db_values
    assert m.db.get_db_value(Register.VERSION) == 'V5.1.0E'
    assert m.db.get_db_value(Register.TS_GRID) == m._utc()
@@ -1880,8 +1963,8 @@ def test_msg_modbus_rsp_new(config_tsun_inv1, msg_modbus_rsp20_new):
    assert m.msg_id==135
    assert m.header_len==23
    assert m.data_len==107
-    assert m._forward_buffer==b''
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==b''
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    assert m.db.stat['proxy']['Modbus_Command'] == 0
    m.close()
@@ -1900,8 +1983,8 @@ def test_msg_modbus_invalid(config_tsun_inv1, msg_modbus_inv):
    assert m.msg_id==119
    assert m.header_len==23
    assert m.data_len==13
-    assert m._forward_buffer==msg_modbus_inv
-    assert m._send_buffer==b''
+    assert m.ifc.fwd_fifo.get()==msg_modbus_inv
+    assert m.ifc.tx_fifo.get()==b''
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 1
    assert m.db.stat['proxy']['Modbus_Command'] == 0
    m.close()
@@ -1929,8 +2012,8 @@ def test_msg_modbus_fragment(config_tsun_inv1, msg_modbus_rsp20):
    assert m.msg_id == 119
    assert m.header_len == 23
    assert m.data_len == 50
-    assert m._forward_buffer==msg_modbus_rsp20
-    assert m._send_buffer == b''
+    assert m.ifc.fwd_fifo.get()==msg_modbus_rsp20
+    assert m.ifc.tx_fifo.get() == b''
    assert m.mb.err == 0
    assert m.modbus_elms == 20-1  # register 0x300d is unknown, so one value can't be mapped
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
@@ -1944,24 +2027,16 @@ async def test_msg_build_modbus_req(config_tsun_inv1, msg_modbus_cmd):
    m.id_str = b"R170000000000001" 
    await m.send_modbus_cmd(Modbus.WRITE_SINGLE_REG, 0x2008, 0, logging.DEBUG)
    assert 0 == m.send_msg_ofs
-    assert m._forward_buffer == b''
-    assert m._send_buffer == b''
-    assert m.writer.sent_pdu == b''
+    assert m.ifc.fwd_fifo.get() == b''
+    assert m.ifc.tx_fifo.get() == b''
+    assert m.sent_pdu == b''

    m.state = State.up
    await m.send_modbus_cmd(Modbus.WRITE_SINGLE_REG, 0x2008, 0, logging.DEBUG)
    assert 0 == m.send_msg_ofs
-    assert m._forward_buffer == b''
-    assert m._send_buffer == b''
-    assert m.writer.sent_pdu == msg_modbus_cmd
-
-    m.writer.sent_pdu = bytearray(0) # clear send buffer for next test    
-    m.test_exception_async_write = True
-    await m.send_modbus_cmd(Modbus.WRITE_SINGLE_REG, 0x2008, 0, logging.DEBUG)
-    assert 0 == m.send_msg_ofs
-    assert m._forward_buffer == b''
-    assert m._send_buffer == b''
-    assert m.writer.sent_pdu == b''
+    assert m.ifc.fwd_fifo.get() == b''
+    assert m.ifc.tx_fifo.get() == b''
+    assert m.sent_pdu == msg_modbus_cmd
    m.close()

 def test_modbus_no_polling(config_no_modbus_poll, msg_get_time):
@@ -1979,8 +2054,8 @@ def test_modbus_no_polling(config_no_modbus_poll, msg_get_time):
    assert m.header_len==23
    assert m.ts_offset==0
    assert m.data_len==0
-    assert m._forward_buffer==msg_get_time
-    assert m._send_buffer==b'\x00\x00\x00\x1b\x10R170000000000001\x91"\x00\x00\x01\x89\xc6,_\x00'
+    assert m.ifc.fwd_fifo.get()==msg_get_time
+    assert m.ifc.tx_fifo.get()==b'\x00\x00\x00\x1b\x10R170000000000001\x91"\x00\x00\x01\x89\xc6,_\x00'
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
    m.close()

@@ -2003,25 +2078,25 @@ async def test_modbus_polling(config_tsun_inv1, msg_inverter_ind):
    assert m.header_len==23
    assert m.ts_offset==0
    assert m.data_len==120
-    assert m._forward_buffer==msg_inverter_ind
-    assert m._send_buffer==b'\x00\x00\x00\x14\x10R170000000000001\x99\x04\x01'
+    assert m.ifc.fwd_fifo.get()==msg_inverter_ind
+    assert m.ifc.tx_fifo.get()==b'\x00\x00\x00\x14\x10R170000000000001\x99\x04\x01'
    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0

-    m._send_buffer = bytearray(0) # clear send buffer for next test
+    m.ifc.tx_clear() # clear send buffer for next test
    assert isclose(m.mb_timeout, 0.5)
    assert next(m.mb_timer.exp_count) == 0
    
    await asyncio.sleep(0.5)
-    assert m.writer.sent_pdu==b'\x00\x00\x00 \x10R170000000000001pw\x00\x01\xa3(\x08\x01\x030\x00\x000J\xde'
-    assert m._send_buffer==b''
+    assert m.sent_pdu==b'\x00\x00\x00 \x10R170000000000001pw\x00\x01\xa3(\x08\x01\x030\x00\x000J\xde'
+    assert m.ifc.tx_fifo.get()==b''
    
    await asyncio.sleep(0.5)
-    assert m.writer.sent_pdu==b'\x00\x00\x00 \x10R170000000000001pw\x00\x01\xa3(\x08\x01\x030\x00\x000J\xde'
-    assert m._send_buffer==b''
+    assert m.sent_pdu==b'\x00\x00\x00 \x10R170000000000001pw\x00\x01\xa3(\x08\x01\x030\x00\x000J\xde'
+    assert m.ifc.tx_fifo.get()==b''
    
    await asyncio.sleep(0.5)
-    assert m.writer.sent_pdu==b'\x00\x00\x00 \x10R170000000000001pw\x00\x01\xa3(\x08\x01\x03\x20\x00\x00`N"'
-    assert m._send_buffer==b''
+    assert m.sent_pdu==b'\x00\x00\x00 \x10R170000000000001pw\x00\x01\xa3(\x08\x01\x03\x20\x00\x00`N"'
+    assert m.ifc.tx_fifo.get()==b''
    assert next(m.mb_timer.exp_count) == 4
    m.close()

@@ -2064,3 +2139,15 @@ def test_multiiple_recv_buf(config_tsun_allow_all, multiple_recv_buf):
    assert m.db.stat['proxy']['Invalid_Data_Type'] == 1

    m.close()
+
+def test_timeout(config_tsun_inv1):
+    _ = config_tsun_inv1
+    m = MemoryStream(b'')
+    assert m.state == State.init
+    assert Talent.MAX_START_TIME == m._timeout()
+    m.state = State.up
+    m.modbus_polling = True
+    assert Talent.MAX_INV_IDLE_TIME == m._timeout()
+    m.modbus_polling = False
+    assert Talent.MAX_DEF_IDLE_TIME == m._timeout()
+    m.close()
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -83,7 +83,7 @@ services:
      - ${PROJECT_DIR:-./}tsun-proxy/log:/home/tsun-proxy/log 
      - ${PROJECT_DIR:-./}tsun-proxy/config:/home/tsun-proxy/config 
    healthcheck:
-      test: wget --no-verbose --tries=1 --spider  http://localhost:8127/-/healthy || exit 1
+      test: wget --no-verbose --tries=1 --spider  http://127.0.0.1:8127/-/healthy || exit 1
      interval: 10s
      timeout: 3s    
    networks:
--- a/tsun.code-workspace
+++ b/tsun.code-workspace
@@ -0,0 +1,11 @@
+{
+	"folders": [
+		{
+			"path": "."
+		},
+		{
+			"path": "../wiki"
+		}
+	],
+	"settings": {}
+}