Dev 0.8 (#107 )

* S allius/issue102 (#103) * hotfix: don't send two MODBUS commands together * Update README.md Exchange logger fw version with the real inverter fw version in the compatibility table * Update python-app.yml run also on pushes to issue branches fix name for issues branches * S allius/issue104 (#105) * Update README.md Exchange logger fw version with the real inverter fw version in the compatibility table * Update python-app.yml run also on pushes to issue branches fix name for issues branches * fix forwarding of MODBUS responses * fix unit tests * update changelog * update changelog
Dev 0.8 (#106 )
2024-06-21 18:41:54 +02:00 · 2024-06-21 18:12:48 +02:00 · 2024-06-08 23:39:28 +02:00 · 2024-06-08 23:23:56 +02:00 · 2024-06-07 19:51:55 +02:00 · 2024-06-07 19:48:41 +02:00
32 changed files with 3018 additions and 525 deletions
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@@ -0,0 +1,3 @@
+# These are supported funding model platforms
+
+ko_fi: sallius
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -5,7 +5,7 @@ name: Python application

 on:
  push:
-    branches: [ "main", "dev-*" ]
+    branches: [ "main", "dev-*", "*/issue*" ]
    paths-ignore:
    - '**.md' # Do no build on *.md changes
    - '**.yml' # Do no build on *.yml changes
@@ -29,15 +29,15 @@ jobs:
    runs-on: ubuntu-latest

    steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
    - name: Set up Python 3.12
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v5
      with:
        python-version: "3.12"
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
-        pip install flake8 pytest
+        pip install flake8 pytest pytest-asyncio
        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
    - name: Lint with flake8
      run: |
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,38 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

 ## [Unreleased]

+## [0.8.1] - 2024-06-21
+
+- Fix MODBUS responses are dropped and not forwarded to the TSUN cloud [#104](https://github.com/s-allius/tsun-gen3-proxy/issues/104)
+- GEN3: Fix connections losts due MODBUS requests [#102](https://github.com/s-allius/tsun-gen3-proxy/issues/102)
+
+## [0.8.0] - 2024-06-07
+
+- improve logging: add protocol or node_id to connection logs
+- improve logging: log ignored AT+ or MODBUS commands
+- improve tracelog: log level depends on message type and source
+- fix typo in docker-compose.yaml and remove the external network definition
+- trace heartbeat and regular modbus pakets witl log level DEBUG
+- GEN3PLUS: don't forward ack paket from tsun to the inverter
+- GEN3PLUS: add allow and block filter for AT+ commands
+- catch all OSError errors in the read loop
+- log Modbus traces with different log levels
+- add Modbus fifo and timeout handler
+- build version string in the same format as TSUN for GEN3 invterts
+- add graceful shutdown
+- parse Modbus values and store them in the database
+- add cron task to request the output power every minute
+- GEN3PLUS: add MQTT topics to send AT commands to the inverter
+- add MQTT topics to send Modbus commands to the inverter
+- convert data collect interval to minutes
+- add postfix for rc and dev versions to the version number
+- change logging level to DEBUG for some logs
+- remove experimental value Register.VALUE_1
+- format Register.POWER_ON_TIME as integer
+- ignore catch-up values from the inverters for now
+
+## [0.7.0] - 2024-04-20
+
 - GEN3PLUS: fix temperature values
 - GEN3PLUS: read corect firmware and logger version
 - GEN3PLUS: add inverter status
--- a/README.md
+++ b/README.md
@@ -39,12 +39,17 @@ If you use a Pi-hole, you can also store the host entry in the Pi-hole.

 ## Features

- supports TSUN GEN3 PLUS inverters: TSOL-MS2000, MS1800 and MS1600
- supports TSUN GEN3 inverters: TSOL-MS800, MS700, MS600, MS400, MS350 and MS300
+- Supports TSUN GEN3 PLUS inverters: TSOL-MS2000, MS1800 and MS1600
+- Supports TSUN GEN3 inverters: TSOL-MS800, MS700, MS600, MS400, MS350 and MS300
 - `MQTT` support
 - `Home-Assistant` auto-discovery support
+- `MODBUS` support via MQTT topics
+- `AT-Command` support via MQTT topics (GEN3PLUS only)
+- Faster DataUp interval sends measurement data to the MQTT broker every minute
 - Self-sufficient island operation without internet
- runs in a non-root Docker Container
+- Security-Features:
+  - control access via `AT-commands`
+  - Runs in a non-root Docker Container

 ## Home Assistant Screenshots

@@ -156,7 +161,7 @@ suggested_area = 'balcony'    # Optional, suggested installation area for home-a
 pv1 = {type = 'RSM40-8-405M', manufacturer = 'Risen'}   # Optional, PV module descr
 pv2 = {type = 'RSM40-8-405M', manufacturer = 'Risen'}   # Optional, PV module descr

-[inverters."Y17xxxxxxxxxxxx1"]
+[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
@@ -165,6 +170,12 @@ pv2 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module de
 pv3 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr
 pv4 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr

+[gen3plus.at_acl]
+tsun.allow = ['AT+Z', 'AT+UPURL', 'AT+SUPDATE']   # allow this for TSUN access
+tsun.block = []                                   
+mqtt.allow = ['AT+']                              # allow all via mqtt
+mqtt.block = []
+
 ```

 ## Inverter Configuration
@@ -215,7 +226,7 @@ In the following table you will find an overview of which inverter model has bee
 A combination with a red question mark should work, but I have not checked it in detail.

 <table align="center">
-  <tr><th align="center">Micro Inverter Model</th><th align="center">Fw. 1.00.06</th><th align="center">Fw. 1.00.17</th><th align="center">Fw. 1.00.20</th><th align="center">Fw. 1.1.00.0B</th></tr>
+  <tr><th align="center">Micro Inverter Model</th><th align="center">Fw. 1.00.06</th><th align="center">Fw. 1.00.17</th><th align="center">Fw. 1.00.20</th><th align="center">Fw. 4.0.10</th></tr>
  <tr><td>GEN3 micro inverters (single MPPT):<br>MS300, MS350, MS400<br>MS400-D</td><td align="center">❓</td><td align="center">❓</td><td align="center">❓</td><td align="center">➖</td></tr>
  <tr><td>GEN3 micro inverters (dual MPPT):<br>MS600, MS700, MS800<br>MS600-D, MS800-D</td><td align="center">✔️</td><td align="center">✔️</td><td align="center">✔️</td><td align="center">➖</td></tr>
  <tr><td>GEN3 PLUS micro inverters:<br>MS1600, MS1800, MS2000<br>MS2000-D</td><td align="center">➖</td><td align="center">➖</td><td align="center">➖</td><td align="center">✔️</td></tr>
@@ -230,7 +241,7 @@ Legend
 🚧: Proxy support in preparation
 ```

-❗The new inverters of the GEN3 Plus generation (e.g. MS-2000) use a completely different protocol for data transmission to the TSUN server. These inverters are supported from proxy version 0.6. The serial numbers of these inverters start with `Y17E` instead of `R17E`
+❗The new inverters of the GEN3 Plus generation (e.g. MS-2000) use a completely different protocol for data transmission to the TSUN server. These inverters are supported from proxy version 0.6. The serial numbers of these inverters start with `Y17E` or `Y47E` instead of `R17E`

 If you have one of these combinations with a red question mark, it would be very nice if you could send me a proxy trace so that I can carry out the detailed checks and adjust the device and system tests. [Ask here how to send a trace](https://github.com/s-allius/tsun-gen3-proxy/discussions/categories/traces-for-compatibility-check)

--- a/app/build.sh
+++ b/app/build.sh
@@ -4,7 +4,7 @@
 # rc: release candidate build
 # rel: release build and push to ghcr.io
 # Note: for release build, you need to set GHCR_TOKEN
-# export GHCR_TOKEN=<YOUR_GITHUB_TOKEN>
+# export GHCR_TOKEN=<YOUR_GITHUB_TOKEN> in your .profile
 # see also: https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-container-registry


@@ -18,22 +18,30 @@ arr=(${VERSION//./ })
 MAJOR=${arr[0]}
 IMAGE=tsun-gen3-proxy

-if [[ $1 == dev ]] || [[ $1 == rc ]] ;then
+if [[ $1 == debug ]] || [[ $1 == dev ]] ;then
 IMAGE=docker.io/sallius/${IMAGE}
-VERSION=${VERSION}
-elif [[ $1 == rel ]];then
+VERSION=${VERSION}-$1
+elif [[ $1 == rc ]] || [[ $1 == rel ]];then
 IMAGE=ghcr.io/s-allius/${IMAGE}
 else
 echo argument missing!
-echo try: $0 '[dev|rc|rel]'
+echo try: $0 '[debug|dev|rc|rel]'
 exit 1
 fi

 echo version: $VERSION  build-date: $BUILD_DATE   image: $IMAGE
-if [[ $1 == dev ]];then
-docker build --build-arg "VERSION=${VERSION}" --build-arg environment=dev --build-arg "LOG_LVL=DEBUG" --label "org.opencontainers.image.created=${BUILD_DATE}" --label "org.opencontainers.image.version=${VERSION}" --label "org.opencontainers.image.revision=${BRANCH}" -t ${IMAGE}:latest app
+if [[ $1 == debug ]];then
+docker build --build-arg "VERSION=${VERSION}" --build-arg environment=dev --build-arg "LOG_LVL=DEBUG" --label "org.opencontainers.image.created=${BUILD_DATE}" --label "org.opencontainers.image.version=${VERSION}" --label "org.opencontainers.image.revision=${BRANCH}" -t ${IMAGE}:dev app
+elif [[ $1 == dev ]];then
+docker build --build-arg "VERSION=${VERSION}" --build-arg environment=production --label "org.opencontainers.image.created=${BUILD_DATE}" --label "org.opencontainers.image.version=${VERSION}" --label "org.opencontainers.image.revision=${BRANCH}" -t ${IMAGE}:dev app
+
 elif [[ $1 == rc ]];then
-docker build --build-arg "VERSION=${VERSION}" --build-arg environment=production --label "org.opencontainers.image.created=${BUILD_DATE}" --label "org.opencontainers.image.version=${VERSION}" --label "org.opencontainers.image.revision=${BRANCH}" -t ${IMAGE}:latest app
+docker build --build-arg "VERSION=${VERSION}" --build-arg environment=production --label "org.opencontainers.image.created=${BUILD_DATE}" --label "org.opencontainers.image.version=${VERSION}" --label "org.opencontainers.image.revision=${BRANCH}" -t ${IMAGE}:rc -t ${IMAGE}:${VERSION} app
+echo 'login to ghcr.io'    
+echo $GHCR_TOKEN | docker login ghcr.io -u s-allius --password-stdin
+docker push ghcr.io/s-allius/tsun-gen3-proxy:rc
+docker push ghcr.io/s-allius/tsun-gen3-proxy:${VERSION}
+
 elif [[ $1 == rel ]];then
 docker build --no-cache --build-arg "VERSION=${VERSION}" --build-arg environment=production --label "org.opencontainers.image.created=${BUILD_DATE}" --label "org.opencontainers.image.version=${VERSION}" --label "org.opencontainers.image.revision=${BRANCH}" -t ${IMAGE}:latest -t ${IMAGE}:${MAJOR} -t ${IMAGE}:${VERSION} app
 echo 'login to ghcr.io'    
@@ -41,4 +49,7 @@ echo $GHCR_TOKEN | docker login ghcr.io -u s-allius --password-stdin
 docker push ghcr.io/s-allius/tsun-gen3-proxy:latest
 docker push ghcr.io/s-allius/tsun-gen3-proxy:${MAJOR}
 docker push ghcr.io/s-allius/tsun-gen3-proxy:${VERSION}
-fi
+fi
+
+echo 'check docker-compose.yaml file'
+docker-compose config -q
--- a/app/config/default_config.toml
+++ b/app/config/default_config.toml
@@ -49,3 +49,8 @@ monitor_sn = 2000000000       # The "Monitoring SN:" can be found on a sticker e
 #pv3 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr
 #pv4 = {type = 'RSM40-8-410M', manufacturer = 'Risen'}   # Optional, PV module descr

+[gen3plus.at_acl]
+tsun.allow = ['AT+Z', 'AT+UPURL', 'AT+SUPDATE']
+tsun.block = []
+mqtt.allow = ['AT+']
+mqtt.block = []
--- a/app/proxy.svg
+++ b/app/proxy.svg
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+<title>A2&#45;&gt;A11</title>
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+<!-- A5&#45;&gt;A6 -->
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+<!-- A6&#45;&gt;A3 -->
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+<text text-anchor="start" x="152.058" y="-1149" font-family="Helvetica,sans-Serif" font-size="10.00" fill="#000000">ha_proxy_conf</text>
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--- a/app/proxy.yuml
+++ b/app/proxy.yuml
@@ -4,13 +4,15 @@

 [note: You can stick notes on diagrams too!{bg:cornsilk}]
 [Singleton]^[Mqtt|<static>ha_restarts;<static>__client;<static>__cb_MqttIsUp|<async>publish();<async>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|_read():void<abstract>;close():void;inc_counter():void;dec_counter():void]
-[Message]^[Talent|await_conn_resp_cnt;id_str;contact_name;contact_mail;switch|msg_contact_info();msg_ota_update();msg_get_time();msg_collector_data();msg_inverter_data();msg_unknown();;close()]
-[Message]^[SolarmanV5|control;serial;snr;switch|msg_unknown();;close()]
+[Modbus|que;;snd_handler;rsp_handler;timeout:max_retires;last_xxx;err;retry_cnt;req_pend;tim|build_msg();recv_req();recv_resp()]
+[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|remoteStream:ConnectionG3|close()]
+[Talent]has-1>[Modbus]
 [SolarmanV5]^[ConnectionG3P|remoteStream:ConnectionG3P|close()]
-[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]
+[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();;close()]
 [Inverter]^[InverterG3P|__ha_restarts|async_create_remote();;close()]
--- a/app/src/async_stream.py
+++ b/app/src/async_stream.py
@@ -17,17 +17,18 @@ class AsyncStream():

    async def server_loop(self, addr):
        '''Loop for receiving messages from the inverter (server-side)'''
-        logging.info(f'Accept connection from  {addr}')
+        logging.info(f'[{self.node_id}] Accept connection from {addr}')
        self.inc_counter('Inverter_Cnt')
        await self.loop()
        self.dec_counter('Inverter_Cnt')
-        logging.info(f'Server loop stopped for r{self.r_addr}')
+        logging.info(f'[{self.node_id}] 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.remoteStream:
            logging.debug("disconnect client connection")
-            self.remoteStream.disc()
+            await self.remoteStream.disc()
        try:
            await self._async_publ_mqtt_proxy_stat('proxy')
        except Exception:
@@ -36,7 +37,8 @@ class AsyncStream():
    async def client_loop(self, addr):
        '''Loop for receiving messages from the TSUN cloud (client-side)'''
        clientStream = await self.remoteStream.loop()
-        logging.info(f'Client loop stopped for l{clientStream.l_addr}')
+        logging.info(f'[{self.node_id}] Client loop stopped for'
+                     f' l{clientStream.l_addr}')

        # if the client connection closes, we don't touch the server
        # connection. Instead we erase the client connection stream,
@@ -61,31 +63,39 @@ class AsyncStream():
                await self.__async_read()

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

-            except (ConnectionResetError,
-                    ConnectionAbortedError,
-                    BrokenPipeError,
-                    RuntimeError) as error:
-                logger.warning(f'In loop for l{self.l_addr} | '
-                               f'r{self.r_addr}: {error}')
+            except OSError as error:
+                logger.error(f'[{self.node_id}] {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}] {error} for {self.l_addr}")
+                await self.disc()
+                self.close()
+                return self
+
            except Exception:
                self.inc_counter('SW_Exception')
                logger.error(
                    f"Exception for {self.addr}:\n"
                    f"{traceback.format_exc()}")
-                self.close()
-                return self

-    def disc(self) -> None:
+    async def disc(self) -> None:
+        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()

    def close(self):
+        if self.writer.is_closing():
+            return
        logger.debug(f'AsyncStream.close() l{self.l_addr} | r{self.r_addr}')
        self.writer.close()

@@ -100,9 +110,9 @@ class AsyncStream():
        else:
            raise RuntimeError("Peer closed.")

-    async def __async_write(self) -> None:
+    async def async_write(self, headline='Transmit to ') -> None:
        if self._send_buffer:
-            hex_dump_memory(logging.INFO, f'Transmit to {self.addr}:',
+            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()
@@ -114,7 +124,7 @@ class AsyncStream():
                await self.async_create_remote()
                if self.remoteStream:
                    if self.remoteStream._init_new_client_conn():
-                        await self.remoteStream.__async_write()
+                        await self.remoteStream.async_write()

            if self.remoteStream:
                self.remoteStream._update_header(self._forward_buffer)
--- a/app/src/config.py
+++ b/app/src/config.py
@@ -3,7 +3,7 @@
 import shutil
 import tomllib
 import logging
-from schema import Schema, And, Use, Optional
+from schema import Schema, And, Or, Use, Optional


 class Config():
@@ -38,6 +38,14 @@ class Config():
            'proxy_node_id':    Use(str),
            'proxy_unique_id':  Use(str)
            },
+        'gen3plus': {
+            'at_acl': {
+                Or('mqtt', 'tsun'): {
+                    'allow': [str],
+                    Optional('block', default=[]): [str]
+                    }
+                }
+            },
        'inverters': {
            'allow_all': Use(bool), And(Use(str), lambda s: len(s) == 16): {
                Optional('monitor_sn', default=0): Use(int),
@@ -76,51 +84,75 @@ class Config():
        )

    @classmethod
-    def read(cls) -> None:
+    def class_init(cls):  # pragma: no cover
+        try:
+            # make the default config transparaent by copying it
+            # in the config.example file
+            logging.debug('Copy Default Config to config.example.toml')
+
+            shutil.copy2("default_config.toml",
+                         "config/config.example.toml")
+        except Exception:
+            pass
+        cls.read()
+
+    @classmethod
+    def _read_config_file(cls) -> dict:  # pragma: no cover
+        usr_config = {}
+
+        try:
+            with open("config/config.toml", "rb") as f:
+                usr_config = tomllib.load(f)
+        except Exception as error:
+            err = f'Config.read: {error}'
+            logging.error(err)
+            logging.info(
+                '\n  To create the missing config.toml file, '
+                'you can rename the template config.example.toml\n'
+                '  and customize it for your scenario.\n')
+        return usr_config
+
+    @classmethod
+    def read(cls, path='') -> None | str:
        '''Read config file, merge it with the default config
        and sanitize the result'''
-
+        err = None
        config = {}
        logger = logging.getLogger('data')

        try:
-            # make the default config transparaent by copying it
-            # in the config.example file
-            shutil.copy2("default_config.toml", "config/config.example.toml")
-
            # read example config file as default configuration
-            with open("default_config.toml", "rb") as f:
+            cls.def_config = {}
+            with open(f"{path}default_config.toml", "rb") as f:
                def_config = tomllib.load(f)
+                cls.def_config = cls.conf_schema.validate(def_config)

            # overwrite the default values, with values from
            # the config.toml file
+            usr_config = cls._read_config_file()
+
+            # merge the default and the user config
+            config = def_config.copy()
+            for key in ['tsun', 'solarman', 'mqtt', 'ha', 'inverters',
+                        'gen3plus']:
+                if key in usr_config:
+                    config[key] |= usr_config[key]
+
            try:
-                with open("config/config.toml", "rb") as f:
-                    usr_config = tomllib.load(f)
+                cls.config = cls.conf_schema.validate(config)
            except Exception as error:
-                logging.error(f'Config.read: {error}')
-                logging.info(
-                    '\n  To create the missing config.toml file, '
-                    'you can rename the template config.example.toml\n'
-                    '  and customize it for your scenario.\n')
-                usr_config = def_config
+                err = f'Config.read: {error}'
+                logging.error(err)

-            config['tsun'] = def_config['tsun'] | usr_config['tsun']
-            config['solarman'] = def_config['solarman'] | \
-                usr_config['solarman']
-            config['mqtt'] = def_config['mqtt'] | usr_config['mqtt']
-            config['ha'] = def_config['ha'] | usr_config['ha']
-            config['inverters'] = def_config['inverters'] | \
-                usr_config['inverters']
-
-            cls.config = cls.conf_schema.validate(config)
-            cls.def_config = cls.conf_schema.validate(def_config)
            # logging.debug(f'Readed config: "{cls.config}" ')

        except Exception as error:
-            logger.error(f'Config.read: {error}')
+            err = f'Config.read: {error}'
+            logger.error(err)
            cls.config = {}

+        return err
+
    @classmethod
    def get(cls, member: str = None):
        '''Get a named attribute from the proxy config. If member ==
--- a/app/src/gen3/infos_g3.py
+++ b/app/src/gen3/infos_g3.py
@@ -30,6 +30,7 @@ class RegisterMap:
        0xffffff05: Register.UNKNOWN_CTRL,
        0xffffff06: Register.OTA_START_MSG,
        0xffffff07: Register.SW_EXCEPTION,
+        0xffffff08: Register.MAX_DESIGNED_POWER,
        0xfffffffe: Register.TEST_REG1,
        0xffffffff: Register.TEST_REG2,
        0x00000640: Register.OUTPUT_POWER,
@@ -104,7 +105,8 @@ class InfosG3(Infos):
            if res:
                yield res

-    def parse(self, buf, ind=0) -> Generator[tuple[str, bool], None, None]:
+    def parse(self, buf, ind=0, node_id: str = '') -> \
+            Generator[tuple[str, bool], None, None]:
        '''parse a data sequence received from the inverter and
        stores the values in Infos.db

@@ -161,7 +163,8 @@ class InfosG3(Infos):
                update = False
                name = str(f'info-id.0x{addr:x}')

-            self.tracer.log(level, f'GEN3: {name} : {result}{unit}'
-                            f'  update: {update}')
+            if update:
+                self.tracer.log(level, f'[{node_id}] GEN3: {name} :'
+                                       f' {result}{unit}')

            i += 1
--- a/app/src/gen3/inverter_g3.py
+++ b/app/src/gen3/inverter_g3.py
@@ -56,7 +56,7 @@ class InverterG3(Inverter, ConnectionG3):
        addr = (host, port)

        try:
-            logging.info(f'Connected to {addr}')
+            logging.info(f'[{self.node_id}] Connected to {addr}')
            connect = asyncio.open_connection(host, port)
            reader, writer = await connect
            self.remoteStream = ConnectionG3(reader, writer, addr, self,
--- a/app/src/gen3/talent.py
+++ b/app/src/gen3/talent.py
@@ -5,10 +5,12 @@ from datetime import datetime

 if __name__ == "app.src.gen3.talent":
    from app.src.messages import hex_dump_memory, Message
+    from app.src.modbus import Modbus
    from app.src.config import Config
    from app.src.gen3.infos_g3 import InfosG3
 else:  # pragma: no cover
    from messages import hex_dump_memory, Message
+    from modbus import Modbus
    from config import Config
    from gen3.infos_g3 import InfosG3

@@ -33,9 +35,8 @@ class Control:


 class Talent(Message):
-
    def __init__(self, server_side: bool, id_str=b''):
-        super().__init__(server_side)
+        super().__init__(server_side, self.send_modbus_cb, mb_timeout=11)
        self.await_conn_resp_cnt = 0
        self.id_str = id_str
        self.contact_name = b''
@@ -46,8 +47,24 @@ class Talent(Message):
            0x13: self.msg_ota_update,
            0x22: self.msg_get_time,
            0x71: self.msg_collector_data,
+            # 0x76:
+            0x77: self.msg_modbus,
+            # 0x78:
            0x04: self.msg_inverter_data,
        }
+        self.log_lvl = {
+            0x00: logging.INFO,
+            0x13: logging.INFO,
+            0x22: logging.INFO,
+            0x71: logging.INFO,
+            # 0x76:
+            0x77: self.get_modbus_log_lvl,
+            # 0x78:
+            0x04: logging.INFO,
+        }
+        self.modbus_elms = 0    # for unit tests
+        self.node_id = 'G3'     # will be overwritten in __set_serial_no
+        # self.forwarding = Config.get('tsun')['enabled']

    '''
    Our puplic methods
@@ -58,6 +75,9 @@ class Talent(Message):
        # 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 = self.STATE_CLOSED
+        super().close()

    def __set_serial_no(self, serial_no: str):

@@ -93,7 +113,11 @@ class Talent(Message):

        if self.header_valid and len(self._recv_buffer) >= (self.header_len +
                                                            self.data_len):
-            hex_dump_memory(logging.INFO, f'Received from {self.addr}:',
+            log_lvl = self.log_lvl.get(self.msg_id, 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)

            self.__set_serial_no(self.id_str.decode("utf-8"))
@@ -115,6 +139,30 @@ class Talent(Message):
                        f' Ctl: {int(self.ctrl):#02x} Msg: {fnc.__name__!r}')
        return

+    def send_modbus_cb(self, modbus_pdu: bytearray, log_lvl: int, state: str):
+        if self.state != self.STATE_UP:
+            logger.warn(f'[{self.node_id}] ignore MODBUS cmd,'
+                        ' cause the state is not UP anymore')
+            return
+
+        self.__build_header(0x70, 0x77)
+        self._send_buffer += b'\x00\x01\xa3\x28'   # fixme
+        self._send_buffer += struct.pack('!B', len(modbus_pdu))
+        self._send_buffer += 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:]
+
+    async def send_modbus_cmd(self, func, addr, val, log_lvl) -> None:
+        if self.state != self.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)
+
    def _init_new_client_conn(self) -> bool:
        contact_name = self.contact_name
        contact_mail = self.contact_mail
@@ -190,11 +238,13 @@ class Talent(Message):
        self.header_valid = True
        return

-    def __build_header(self, ctrl) -> None:
+    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, self.msg_id)
-        fnc = self.switch.get(self.msg_id, self.msg_unknown)
+                                         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}')

@@ -306,6 +356,7 @@ class Talent(Message):
            self._send_buffer += b'\x01'
            self.__finish_send_msg()
            self.__process_data()
+            self.state = self.STATE_UP

        elif self.ctrl.is_resp():
            return  # ignore received response
@@ -321,6 +372,7 @@ class Talent(Message):
            self._send_buffer += b'\x01'
            self.__finish_send_msg()
            self.__process_data()
+            self.state = self.STATE_UP

        elif self.ctrl.is_resp():
            return  # ignore received response
@@ -334,7 +386,7 @@ class Talent(Message):
        msg_hdr_len = self.parse_msg_header()

        for key, update in self.db.parse(self._recv_buffer, self.header_len
-                                         + msg_hdr_len):
+                                         + msg_hdr_len, self.node_id):
            if update:
                self.new_data[key] = True

@@ -348,6 +400,54 @@ class Talent(Message):
            self.inc_counter('Unknown_Ctrl')
        self.forward(self._recv_buffer, self.header_len+self.data_len)

+    def parse_modbus_header(self):
+
+        msg_hdr_len = 5
+
+        result = struct.unpack_from('!lBB', self._recv_buffer,
+                                    self.header_len)
+        modbus_len = result[1]
+        # logger.debug(f'Ref: {result[0]}')
+        # logger.debug(f'Modbus MsgLen: {modbus_len} Func:{result[2]}')
+        return msg_hdr_len, modbus_len
+
+    def get_modbus_log_lvl(self) -> int:
+        if self.ctrl.is_req():
+            return logging.INFO
+        elif self.ctrl.is_ind():
+            if self.server_side:
+                return self.mb.last_log_lvl
+        return logging.WARNING
+
+    def msg_modbus(self):
+        hdr_len, modbus_len = self.parse_modbus_header()
+        data = self._recv_buffer[self.header_len:
+                                 self.header_len+self.data_len]
+
+        if self.ctrl.is_req():
+            if self.remoteStream.mb.recv_req(data[hdr_len:],
+                                             self.remoteStream.
+                                             msg_forward):
+                self.inc_counter('Modbus_Command')
+            else:
+                self.inc_counter('Invalid_Msg_Format')
+        elif self.ctrl.is_ind():
+            # logger.debug(f'Modbus Ind  MsgLen: {modbus_len}')
+            self.modbus_elms = 0
+            for key, update, _ in self.mb.recv_resp(self.db, data[
+                    hdr_len:],
+                    self.node_id):
+                if update:
+                    self.new_data[key] = True
+                self.modbus_elms += 1          # count for unit tests
+        else:
+            logger.warning('Unknown Ctrl')
+            self.inc_counter('Unknown_Ctrl')
+            self.forward(self._recv_buffer, self.header_len+self.data_len)
+
+    def msg_forward(self):
+        self.forward(self._recv_buffer, self.header_len+self.data_len)
+
    def msg_unknown(self):
        logger.warning(f"Unknow Msg: ID:{self.msg_id}")
        self.inc_counter('Unknown_Msg')
--- a/app/src/gen3plus/infos_g3p.py
+++ b/app/src/gen3plus/infos_g3p.py
@@ -15,17 +15,17 @@ class RegisterMap:
    map = {
        # 0x41020007: {'reg': Register.DEVICE_SNR,           'fmt': '<L'},                 # noqa: E501
        0x41020018: {'reg': Register.DATA_UP_INTERVAL,     'fmt': '<B', 'ratio':   60},  # noqa: E501
-        0x41020019: {'reg': Register.COLLECT_INTERVAL,     'fmt': '<B', 'ratio':    1},  # noqa: E501
+        0x41020019: {'reg': Register.COLLECT_INTERVAL,     'fmt': '<B', 'eval': 'round(result/60)'},  # noqa: E501
        0x4102001a: {'reg': Register.HEARTBEAT_INTERVAL,   'fmt': '<B', 'ratio':    1},  # noqa: E501
        0x4102001c: {'reg': Register.SIGNAL_STRENGTH,      'fmt': '<B', 'ratio':    1},  # noqa: E501
        0x4102001e: {'reg': Register.CHIP_MODEL,           'fmt': '!40s'},               # noqa: E501
-        0x4102004c: {'reg': Register.IP_ADRESS,            'fmt': '!16s'},               # noqa: E501
+        0x4102004c: {'reg': Register.IP_ADDRESS,           'fmt': '!16s'},               # noqa: E501
        0x41020064: {'reg': Register.COLLECTOR_FW_VERSION, 'fmt': '!40s'},               # noqa: E501

        0x4201001c: {'reg': Register.POWER_ON_TIME,        'fmt': '<H', 'ratio':    1},  # noqa: E501
        0x42010020: {'reg': Register.SERIAL_NUMBER,        'fmt': '!16s'},               # noqa: E501
        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
+        0x420100d0: {'reg': Register.VERSION,              'fmt': '!H', 'eval': "f'V{(result>>12)}.{(result>>8)&0xf}.{(result>>4)&0xf}{result&0xf}'"},  # 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
@@ -58,7 +58,7 @@ class RegisterMap:
        0x42010126: {'reg': Register.MAX_DESIGNED_POWER,   'fmt': '!H', 'ratio':    1},  # noqa: E501
        0x42010170: {'reg': Register.NO_INPUTS,            'fmt': '!B'},                 # noqa: E501

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

    }

@@ -88,7 +88,7 @@ class InfosG3P(Infos):
            if res:
                yield res

-    def parse(self, buf, msg_type: int, rcv_ftype: int) \
+    def parse(self, buf, msg_type: int, rcv_ftype: int, node_id: str = '') \
            -> Generator[tuple[str, bool], None, None]:
        '''parse a data sequence received from the inverter and
        stores the values in Infos.db
@@ -122,5 +122,6 @@ class InfosG3P(Infos):
                name = str(f'info-id.0x{addr:x}')
                update = False

-            self.tracer.log(level, f'GEN3PLUS: {name} : {result}{unit}'
-                            f'  update: {update}')
+            if update:
+                self.tracer.log(level, f'[{node_id}] GEN3PLUS: {name}'
+                                       f' : {result}{unit}')
--- a/app/src/gen3plus/inverter_g3p.py
+++ b/app/src/gen3plus/inverter_g3p.py
@@ -56,7 +56,7 @@ class InverterG3P(Inverter, ConnectionG3P):
        addr = (host, port)

        try:
-            logging.info(f'Connected to {addr}')
+            logging.info(f'[{self.node_id}] Connected to {addr}')
            connect = asyncio.open_connection(host, port)
            reader, writer = await connect
            self.remoteStream = ConnectionG3P(reader, writer, addr, self,
--- a/app/src/gen3plus/solarman_v5.py
+++ b/app/src/gen3plus/solarman_v5.py
@@ -2,16 +2,19 @@ import struct
 # import json
 import logging
 import time
+import asyncio
 from datetime import datetime

 if __name__ == "app.src.gen3plus.solarman_v5":
    from app.src.messages import hex_dump_memory, Message
+    from app.src.modbus import Modbus
    from app.src.config import Config
    from app.src.gen3plus.infos_g3p import InfosG3P
    from app.src.infos import Register
 else:  # pragma: no cover
    from messages import hex_dump_memory, Message
    from config import Config
+    from modbus import Modbus
    from gen3plus.infos_g3p import InfosG3P
    from infos import Register
 # import traceback
@@ -46,9 +49,11 @@ class Sequence():


 class SolarmanV5(Message):
+    AT_CMD = 1
+    MB_RTU_CMD = 2

    def __init__(self, server_side: bool):
-        super().__init__(server_side)
+        super().__init__(server_side, self.send_modbus_cb, mb_timeout=5)

        self.header_len = 11  # overwrite construcor in class Message
        self.control = 0
@@ -56,6 +61,7 @@ class SolarmanV5(Message):
        self.snr = 0
        self.db = InfosG3P()
        self.time_ofs = 0
+        self.forward_at_cmd_resp = False
        self.switch = {

            0x4210: self.msg_data_ind,   # real time data
@@ -84,9 +90,41 @@ class SolarmanV5(Message):
            #
            # MODbus or AT cmd
            0x4510: self.msg_command_req,  # from server
-            0x1510: self.msg_response,     # from inverter
+            0x1510: self.msg_command_rsp,     # from inverter
+            # 0x0510: self.msg_command_rsp,     # from inverter
        }

+        self.log_lvl = {
+
+            0x4210: logging.INFO,   # real time data
+            0x1210: logging.INFO,   # at least every 5 minutes
+
+            0x4710: logging.DEBUG,  # heatbeat
+            0x1710: logging.DEBUG,  # every 2 minutes
+
+            0x4110: logging.INFO,   # device data, sync start
+            0x1110: logging.INFO,   # every 3 hours
+
+            0x4310: logging.INFO,   # regulary after 3-6 hours
+            0x1310: logging.INFO,
+
+            0x4810: logging.INFO,   # sync end
+            0x1810: logging.INFO,
+
+            #
+            # MODbus or AT cmd
+            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.forwarding = Config.get('solarman')['enabled']
+
    '''
    Our puplic methods
    '''
@@ -96,6 +134,9 @@ class SolarmanV5(Message):
        # 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 = self.STATE_CLOSED
+        super().close()

    def __set_serial_no(self, snr: int):
        serial_no = str(snr)
@@ -136,7 +177,10 @@ class SolarmanV5(Message):

        if self.header_valid and len(self._recv_buffer) >= (self.header_len +
                                                            self.data_len+2):
-            hex_dump_memory(logging.INFO, f'Received from {self.addr}:',
+            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):
@@ -293,41 +337,90 @@ class SolarmanV5(Message):
                                         self._heartbeat())
        self.__finish_send_msg()

-    def send_at_cmd(self, AT_cmd: str) -> None:
+    def send_modbus_cb(self, pdu: bytearray, log_lvl: int, state: str):
+        if self.state != self.STATE_UP:
+            logger.warn(f'[{self.node_id}] ignore MODBUS cmd,'
+                        ' cause the state is not UP anymore')
+            return
        self.__build_header(0x4510)
-        self._send_buffer += struct.pack(f'<BHLLL{len(AT_cmd)}sc', 1, 2,
-                                         0, 0, 0, AT_cmd.encode('utf-8'),
+        self._send_buffer += struct.pack('<BHLLL', self.MB_RTU_CMD,
+                                         0x2b0, 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:]
+
+    async def send_modbus_cmd(self, func, addr, val, log_lvl) -> None:
+        if self.state != self.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)
+
+    def at_cmd_forbidden(self, cmd: str, connection: str) -> bool:
+        return not cmd.startswith(tuple(self.at_acl[connection]['allow'])) or \
+                cmd.startswith(tuple(self.at_acl[connection]['block']))
+
+    async def send_at_cmd(self, AT_cmd: str) -> None:
+        if self.state != self.STATE_UP:
+            logger.warn(f'[{self.node_id}] ignore AT+ cmd,'
+                        ' as the state is not UP')
+            return
+        AT_cmd = AT_cmd.strip()
+
+        if self.at_cmd_forbidden(cmd=AT_cmd, connection='mqtt'):
+            data_json = f'\'{AT_cmd}\' is forbidden'
+            node_id = self.node_id
+            key = 'at_resp'
+            logger.info(f'{key}: {data_json}')
+            asyncio.ensure_future(
+                self.publish_mqtt(f'{self.entity_prfx}{node_id}{key}', data_json))  # noqa: E501
+            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,
+                                         2, 0, 0, 0, AT_cmd.encode('utf-8'),
                                         b'\r')
        self.__finish_send_msg()
+        try:
+            await self.async_write('Send AT Command:')
+        except Exception:
+            self._send_buffer = bytearray(0)

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

+    def __build_model_name(self):
+        db = self.db
+        MaxPow = db.get_db_value(Register.MAX_DESIGNED_POWER, 0)
+        Rated = db.get_db_value(Register.RATED_POWER, 0)
+        Model = None
+        if MaxPow == 2000:
+            if Rated == 800 or Rated == 600:
+                Model = f'TSOL-MS{MaxPow}({Rated})'
+            else:
+                Model = f'TSOL-MS{MaxPow}'
+        elif MaxPow == 1800 or MaxPow == 1600:
+            Model = f'TSOL-MS{MaxPow}'
+        if Model:
+            logger.info(f'Model: {Model}')
+            self.db.set_db_def_value(Register.EQUIPMENT_MODEL, Model)
+
    def __process_data(self, ftype):
        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._recv_buffer, msg_type, ftype,
+                                         self.node_id):
            if update:
                if key == 'inverter':
                    inv_update = True
                self.new_data[key] = True

        if inv_update:
-            db = self.db
-            MaxPow = db.get_db_value(Register.MAX_DESIGNED_POWER, 0)
-            Rated = db.get_db_value(Register.RATED_POWER, 0)
-            Model = None
-            if MaxPow == 2000:
-                if Rated == 800 or Rated == 600:
-                    Model = f'TSOL-MS{MaxPow}({Rated})'
-                else:
-                    Model = f'TSOL-MS{MaxPow}'
-            elif MaxPow == 1800 or MaxPow == 1600:
-                Model = f'TSOL-MS{MaxPow}'
-            if Model:
-                logger.info(f'Model: {Model}')
-                self.db.set_db_def_value(Register.EQUIPMENT_MODEL, Model)
-
+            self.__build_model_name()
    '''
    Message handler methods
    '''
@@ -340,14 +433,14 @@ class SolarmanV5(Message):
        data = self._recv_buffer[self.header_len:]
        result = struct.unpack_from('<BLLL', data, 0)
        ftype = result[0]  # always 2
-        total = result[1]
+        # total = result[1]
        tim = result[2]
        res = result[3]  # always zero
        logger.info(f'frame type:{ftype:02x}'
                    f' timer:{tim:08x}s  null:{res}')
-        if self.time_ofs:
-            dt = datetime.fromtimestamp(total + self.time_ofs)
-            logger.info(f'ts: {dt.strftime("%Y-%m-%d %H:%M:%S")}')
+        # if self.time_ofs:
+        #     dt = datetime.fromtimestamp(total + self.time_ofs)
+        #     logger.info(f'ts: {dt.strftime("%Y-%m-%d %H:%M:%S")}')

        self.__process_data(ftype)
        self.__forward_msg()
@@ -357,7 +450,7 @@ class SolarmanV5(Message):
        data = self._recv_buffer
        result = struct.unpack_from('<BHLLLHL', data, self.header_len)
        ftype = result[0]  # 1 or 0x81
-        total = result[2]
+        # total = result[2]
        tim = result[3]
        if 1 == ftype:
            self.time_ofs = result[4]
@@ -365,13 +458,14 @@ class SolarmanV5(Message):
        cnt = result[6]
        logger.info(f'ftype:{ftype:02x} timer:{tim:08x}s'
                    f' ??: {unkn:04x} cnt:{cnt}')
-        if self.time_ofs:
-            dt = datetime.fromtimestamp(total + self.time_ofs)
-            logger.info(f'ts: {dt.strftime("%Y-%m-%d %H:%M:%S")}')
+        # if self.time_ofs:
+        #     dt = datetime.fromtimestamp(total + self.time_ofs)
+        #     logger.info(f'ts: {dt.strftime("%Y-%m-%d %H:%M:%S")}')

        self.__process_data(ftype)
        self.__forward_msg()
        self.__send_ack_rsp(0x1210, ftype)
+        self.state = self.STATE_UP

    def msg_sync_start(self):
        data = self._recv_buffer[self.header_len:]
@@ -387,13 +481,78 @@ class SolarmanV5(Message):
        self.__send_ack_rsp(0x1310, ftype)

    def msg_command_req(self):
-        data = self._recv_buffer[self.header_len:]
+        data = self._recv_buffer[self.header_len:
+                                 self.header_len+self.data_len]
        result = struct.unpack_from('<B', data, 0)
        ftype = result[0]
+        if ftype == self.AT_CMD:
+            AT_cmd = data[15:].decode()
+            if self.at_cmd_forbidden(cmd=AT_cmd, connection='tsun'):
+                self.inc_counter('AT_Command_Blocked')
+                return
+            self.inc_counter('AT_Command')
+            self.forward_at_cmd_resp = True
+
+        elif ftype == self.MB_RTU_CMD:
+            if self.remoteStream.mb.recv_req(data[15:],
+                                             self.remoteStream.
+                                             __forward_msg):
+                self.inc_counter('Modbus_Command')
+            else:
+                self.inc_counter('Invalid_Msg_Format')
+            return

-        self.inc_counter('AT_Command')
        self.__forward_msg()
-        self.__send_ack_rsp(0x1510, ftype)
+
+    async def publish_mqtt(self, key, data):
+        await self.mqtt.publish(key, data)  # pragma: no cover
+
+    def get_cmd_rsp_log_lvl(self) -> int:
+        ftype = self._recv_buffer[self.header_len]
+        if ftype == self.AT_CMD:
+            if self.forward_at_cmd_resp:
+                return logging.INFO
+            return logging.DEBUG
+        elif ftype == self.MB_RTU_CMD:
+            if self.server_side:
+                return self.mb.last_log_lvl
+
+        return logging.WARNING
+
+    def msg_command_rsp(self):
+        data = self._recv_buffer[self.header_len:
+                                 self.header_len+self.data_len]
+        ftype = data[0]
+        if ftype == self.AT_CMD:
+            if not self.forward_at_cmd_resp:
+                data_json = data[14:].decode("utf-8")
+                node_id = self.node_id
+                key = 'at_resp'
+                logger.info(f'{key}: {data_json}')
+                asyncio.ensure_future(
+                    self.publish_mqtt(f'{self.entity_prfx}{node_id}{key}', data_json))  # noqa: E501
+                return
+        elif ftype == self.MB_RTU_CMD:
+            valid = data[1]
+            modbus_msg_len = self.data_len - 14
+            # 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
+                self.modbus_elms = 0
+
+                for key, update, _ in self.mb.recv_resp(self.db, data[14:],
+                                                        self.node_id):
+                    self.modbus_elms += 1
+                    if update:
+                        if key == 'inverter':
+                            inv_update = True
+                        self.new_data[key] = True
+
+                if inv_update:
+                    self.__build_model_name()
+            return
+        self.__forward_msg()

    def msg_hbeat_ind(self):
        data = self._recv_buffer[self.header_len:]
@@ -402,6 +561,7 @@ class SolarmanV5(Message):

        self.__forward_msg()
        self.__send_ack_rsp(0x1710, ftype)
+        self.state = self.STATE_UP

    def msg_sync_end(self):
        data = self._recv_buffer[self.header_len:]
@@ -423,8 +583,8 @@ class SolarmanV5(Message):
        valid = result[1] == 1  # status
        ts = result[2]
        set_hb = result[3]  # always 60 or 120
-        logger.info(f'ftype:{ftype} accepted:{valid}'
-                    f' ts:{ts:08x}  nextHeartbeat: {set_hb}s')
+        logger.debug(f'ftype:{ftype} accepted:{valid}'
+                     f' ts:{ts:08x}  nextHeartbeat: {set_hb}s')

        dt = datetime.fromtimestamp(ts)
-        logger.info(f'ts: {dt.strftime("%Y-%m-%d %H:%M:%S")}')
+        logger.debug(f'ts: {dt.strftime("%Y-%m-%d %H:%M:%S")}')
--- a/app/src/infos.py
+++ b/app/src/infos.py
@@ -28,6 +28,8 @@ class Register(Enum):
    SW_EXCEPTION = 57
    INVALID_MSG_FMT = 58
    AT_COMMAND = 59
+    MODBUS_COMMAND = 60
+    AT_COMMAND_BLOCKED = 61
    OUTPUT_POWER = 83
    RATED_POWER = 84
    INVERTER_TEMP = 85
@@ -86,7 +88,7 @@ class Register(Enum):
    DATA_UP_INTERVAL = 404
    CONNECT_COUNT = 405
    HEARTBEAT_INTERVAL = 406
-    IP_ADRESS = 407
+    IP_ADDRESS = 407
    EVENT_401 = 500
    EVENT_402 = 501
    EVENT_403 = 502
@@ -145,7 +147,7 @@ class Infos:

    @classmethod
    def static_init(cls):
-        logging.info('Initialize proxy statistics')
+        logging.debug('Initialize proxy statistics')
        # init proxy counter in the class.stat dictionary
        cls.stat['proxy'] = {}
        for key in cls.__info_defs:
@@ -192,7 +194,7 @@ class Infos:
        Register.SERIAL_NUMBER:   {'name': ['inverter', 'Serial_Number'],          'level': logging.DEBUG, 'unit': ''},  # noqa: E501
        Register.EQUIPMENT_MODEL: {'name': ['inverter', 'Equipment_Model'],        'level': logging.DEBUG, 'unit': ''},  # noqa: E501
        Register.NO_INPUTS:       {'name': ['inverter', 'No_Inputs'],              'level': logging.DEBUG, 'unit': ''},  # noqa: E501
-        Register.MAX_DESIGNED_POWER: {'name': ['inverter',  'Max_Designed_Power'], 'level': logging.DEBUG, 'unit': 'W',    'ha': {'dev': 'inverter', 'dev_cla': None,          'stat_cla': None,          'id': 'designed_power_', 'fmt': '| string + " W"', 'name': 'Max Designed Power', 'icon': 'mdi:lightning-bolt', 'ent_cat': 'diagnostic'}},  # 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_', 'fmt': '| string + " W"', 'name': 'Max Designed Power', 'icon': 'mdi:lightning-bolt', '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_', 'fmt': '| string + " W"', 'name': 'Rated Power', 'icon': 'mdi:lightning-bolt', 'ent_cat': 'diagnostic'}},  # noqa: E501

        Register.PV1_MANUFACTURER: {'name': ['inverter', 'PV1_Manufacturer'],      'level': logging.DEBUG, 'unit': ''},  # noqa: E501
@@ -209,16 +211,18 @@ class Infos:
        Register.PV6_MODEL:        {'name': ['inverter', 'PV6_Model'],             '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': '| int', 'name': 'Active Inverter Connections',    'icon': 'mdi: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': '| int', 'name': 'Unknown Serial No',    'icon': 'mdi: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': '| int', 'name': 'Unknown Msg Type',     'icon': 'mdi: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': '| int', 'name': 'Invalid Data Type',    'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
-        Register.INTERNAL_ERROR:    {'name': ['proxy', 'Internal_Error'],     'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'intern_err_',    'fmt': '| int', 'name': 'Internal Error',       'icon': 'mdi:counter', 'ent_cat': 'diagnostic', 'en': False}},  # noqa: E501
-        Register.UNKNOWN_CTRL:      {'name': ['proxy', 'Unknown_Ctrl'],       'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'unknown_ctrl_',  'fmt': '| int', 'name': 'Unknown Control Type', 'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
-        Register.OTA_START_MSG:     {'name': ['proxy', 'OTA_Start_Msg'],      'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'ota_start_cmd_', 'fmt': '| int', 'name': 'OTA Start Cmd',        'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
-        Register.SW_EXCEPTION:      {'name': ['proxy', 'SW_Exception'],       'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'sw_exception_',  'fmt': '| int', 'name': 'Internal SW Exception', 'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
-        Register.INVALID_MSG_FMT:   {'name': ['proxy', 'Invalid_Msg_Format'], 'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'inv_msg_fmt_',   'fmt': '| int', 'name': 'Invalid Message Format', 'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
-        Register.AT_COMMAND:        {'name': ['proxy', 'AT_Command'],         'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'at_cmd_',        'fmt': '| int', 'name': 'AT Command',           'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
+        Register.INVERTER_CNT:       {'name': ['proxy', 'Inverter_Cnt'],       'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'inv_count_',     'fmt': '| int', 'name': 'Active Inverter Connections',    'icon': 'mdi: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': '| int', 'name': 'Unknown Serial No',    'icon': 'mdi: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': '| int', 'name': 'Unknown Msg Type',     'icon': 'mdi: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': '| int', 'name': 'Invalid Data Type',    'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
+        Register.INTERNAL_ERROR:     {'name': ['proxy', 'Internal_Error'],     'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'intern_err_',    'fmt': '| int', 'name': 'Internal Error',       'icon': 'mdi:counter', 'ent_cat': 'diagnostic', 'en': False}},  # noqa: E501
+        Register.UNKNOWN_CTRL:       {'name': ['proxy', 'Unknown_Ctrl'],       'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'unknown_ctrl_',  'fmt': '| int', 'name': 'Unknown Control Type', 'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
+        Register.OTA_START_MSG:      {'name': ['proxy', 'OTA_Start_Msg'],      'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'ota_start_cmd_', 'fmt': '| int', 'name': 'OTA Start Cmd',        'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
+        Register.SW_EXCEPTION:       {'name': ['proxy', 'SW_Exception'],       'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'sw_exception_',  'fmt': '| int', 'name': 'Internal SW Exception', 'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
+        Register.INVALID_MSG_FMT:    {'name': ['proxy', 'Invalid_Msg_Format'], 'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'inv_msg_fmt_',   'fmt': '| int', 'name': 'Invalid Message Format', 'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
+        Register.AT_COMMAND:         {'name': ['proxy', 'AT_Command'],         'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'at_cmd_',        'fmt': '| int', 'name': 'AT Command',           'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
+        Register.AT_COMMAND_BLOCKED: {'name': ['proxy', 'AT_Command_Blocked'], 'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'at_cmd_blocked_', 'fmt': '| int', 'name': 'AT Command Blocked',   'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
+        Register.MODBUS_COMMAND:     {'name': ['proxy', 'Modbus_Command'],     'singleton': True,   'ha': {'dev': 'proxy', 'comp': 'sensor', 'dev_cla': None, 'stat_cla': None, 'id': 'modbus_cmd_',    'fmt': '| int', 'name': 'Modbus Command',       'icon': 'mdi:counter', 'ent_cat': 'diagnostic'}},  # noqa: E501
        # 0xffffff03:  {'name':['proxy', 'Voltage'],                        'level': logging.DEBUG, 'unit': 'V',    'ha':{'dev':'proxy', 'dev_cla': 'voltage',     'stat_cla': 'measurement', 'id':'proxy_volt_',  'fmt':'| float','name': 'Grid Voltage'}},  # noqa: E501

        # events
@@ -230,7 +234,7 @@ class Infos:
        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_'],                          '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
@@ -245,28 +249,27 @@ class Infos:
        Register.GRID_FREQUENCY:  {'name': ['grid', 'Frequency'],                  'level': logging.DEBUG, 'unit': 'Hz',   'ha': {'dev': 'inverter', 'dev_cla': 'frequency',   'stat_cla': 'measurement', 'id': 'out_freq_',  'fmt': '| float', 'name': 'Grid Frequency', 'ent_cat': 'diagnostic'}},  # noqa: E501
        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': '| 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': '| int', 'name': 'Temperature'}},  # noqa: E501
-        Register.VALUE_1:         {'name': ['env',  'Value_1'],                    'level': logging.INFO,  'unit': '',     'ha': {'dev': 'inverter', 'dev_cla': None,          'stat_cla': 'measurement', 'id': 'value_1_',   'fmt': '| int', 'name': 'Value 1',  'ent_cat': 'diagnostic'}},  # 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:counter'}},  # noqa: E501

        # input measures:
        Register.PV1_VOLTAGE:  {'name': ['input', 'pv1', 'Voltage'],               'level': logging.DEBUG, 'unit': 'V',    'ha': {'dev': 'input_pv1', 'dev_cla': 'voltage', 'stat_cla': 'measurement', 'id': 'volt_pv1_',  'val_tpl': "{{ (value_json['pv1']['Voltage'] | float)}}", 'icon': 'mdi:gauge', 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.PV1_CURRENT:  {'name': ['input', 'pv1', 'Current'],               'level': logging.DEBUG, 'unit': 'A',    'ha': {'dev': 'input_pv1', 'dev_cla': 'current', 'stat_cla': 'measurement', 'id': 'cur_pv1_',   'val_tpl': "{{ (value_json['pv1']['Current'] | float)}}", 'icon': 'mdi:gauge', 'ent_cat': 'diagnostic'}},  # noqa: E501
-        Register.PV1_POWER:    {'name': ['input', 'pv1', 'Power'],                 'level': logging.INFO,  'unit': 'W',    'ha': {'dev': 'input_pv1', 'dev_cla': 'power',   'stat_cla': 'measurement', 'id': 'power_pv1_', 'val_tpl': "{{ (value_json['pv1']['Power'] | float)}}"}},  # noqa: E501
+        Register.PV1_POWER:    {'name': ['input', 'pv1', 'Power'],                 'level': logging.DEBUG, 'unit': 'W',    'ha': {'dev': 'input_pv1', 'dev_cla': 'power',   'stat_cla': 'measurement', 'id': 'power_pv1_', 'val_tpl': "{{ (value_json['pv1']['Power'] | float)}}"}},  # noqa: E501
        Register.PV2_VOLTAGE:  {'name': ['input', 'pv2', 'Voltage'],               'level': logging.DEBUG, 'unit': 'V',    'ha': {'dev': 'input_pv2', 'dev_cla': 'voltage', 'stat_cla': 'measurement', 'id': 'volt_pv2_',  'val_tpl': "{{ (value_json['pv2']['Voltage'] | float)}}", 'icon': 'mdi:gauge', 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.PV2_CURRENT:  {'name': ['input', 'pv2', 'Current'],               'level': logging.DEBUG, 'unit': 'A',    'ha': {'dev': 'input_pv2', 'dev_cla': 'current', 'stat_cla': 'measurement', 'id': 'cur_pv2_',   'val_tpl': "{{ (value_json['pv2']['Current'] | float)}}", 'icon': 'mdi:gauge', 'ent_cat': 'diagnostic'}},  # noqa: E501
-        Register.PV2_POWER:    {'name': ['input', 'pv2', 'Power'],                 'level': logging.INFO,  'unit': 'W',    'ha': {'dev': 'input_pv2', 'dev_cla': 'power',   'stat_cla': 'measurement', 'id': 'power_pv2_', 'val_tpl': "{{ (value_json['pv2']['Power'] | float)}}"}},  # noqa: E501
+        Register.PV2_POWER:    {'name': ['input', 'pv2', 'Power'],                 'level': logging.DEBUG, 'unit': 'W',    'ha': {'dev': 'input_pv2', 'dev_cla': 'power',   'stat_cla': 'measurement', 'id': 'power_pv2_', 'val_tpl': "{{ (value_json['pv2']['Power'] | float)}}"}},  # noqa: E501
        Register.PV3_VOLTAGE:  {'name': ['input', 'pv3', 'Voltage'],               'level': logging.DEBUG, 'unit': 'V',    'ha': {'dev': 'input_pv3', 'dev_cla': 'voltage', 'stat_cla': 'measurement', 'id': 'volt_pv3_',  'val_tpl': "{{ (value_json['pv3']['Voltage'] | float)}}", 'icon': 'mdi:gauge', 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.PV3_CURRENT:  {'name': ['input', 'pv3', 'Current'],               'level': logging.DEBUG, 'unit': 'A',    'ha': {'dev': 'input_pv3', 'dev_cla': 'current', 'stat_cla': 'measurement', 'id': 'cur_pv3_',   'val_tpl': "{{ (value_json['pv3']['Current'] | float)}}", 'icon': 'mdi:gauge', 'ent_cat': 'diagnostic'}},  # noqa: E501
-        Register.PV3_POWER:    {'name': ['input', 'pv3', 'Power'],                 'level': logging.INFO,  'unit': 'W',    'ha': {'dev': 'input_pv3', 'dev_cla': 'power',   'stat_cla': 'measurement', 'id': 'power_pv3_', 'val_tpl': "{{ (value_json['pv3']['Power'] | float)}}"}},  # noqa: E501
+        Register.PV3_POWER:    {'name': ['input', 'pv3', 'Power'],                 'level': logging.DEBUG, 'unit': 'W',    'ha': {'dev': 'input_pv3', 'dev_cla': 'power',   'stat_cla': 'measurement', 'id': 'power_pv3_', 'val_tpl': "{{ (value_json['pv3']['Power'] | float)}}"}},  # noqa: E501
        Register.PV4_VOLTAGE:  {'name': ['input', 'pv4', 'Voltage'],               'level': logging.DEBUG, 'unit': 'V',    'ha': {'dev': 'input_pv4', 'dev_cla': 'voltage', 'stat_cla': 'measurement', 'id': 'volt_pv4_',  'val_tpl': "{{ (value_json['pv4']['Voltage'] | float)}}", 'icon': 'mdi:gauge', 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.PV4_CURRENT:  {'name': ['input', 'pv4', 'Current'],               'level': logging.DEBUG, 'unit': 'A',    'ha': {'dev': 'input_pv4', 'dev_cla': 'current', 'stat_cla': 'measurement', 'id': 'cur_pv4_',   'val_tpl': "{{ (value_json['pv4']['Current'] | float)}}", 'icon': 'mdi:gauge', 'ent_cat': 'diagnostic'}},  # noqa: E501
-        Register.PV4_POWER:    {'name': ['input', 'pv4', 'Power'],                 'level': logging.INFO,  'unit': 'W',    'ha': {'dev': 'input_pv4', 'dev_cla': 'power',   'stat_cla': 'measurement', 'id': 'power_pv4_', 'val_tpl': "{{ (value_json['pv4']['Power'] | float)}}"}},  # noqa: E501
+        Register.PV4_POWER:    {'name': ['input', 'pv4', 'Power'],                 'level': logging.DEBUG, 'unit': 'W',    'ha': {'dev': 'input_pv4', 'dev_cla': 'power',   'stat_cla': 'measurement', 'id': 'power_pv4_', 'val_tpl': "{{ (value_json['pv4']['Power'] | float)}}"}},  # noqa: E501
        Register.PV5_VOLTAGE:  {'name': ['input', 'pv5', 'Voltage'],               'level': logging.DEBUG, 'unit': 'V',    'ha': {'dev': 'input_pv5', 'dev_cla': 'voltage', 'stat_cla': 'measurement', 'id': 'volt_pv5_',  'val_tpl': "{{ (value_json['pv5']['Voltage'] | float)}}", 'icon': 'mdi:gauge', 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.PV5_CURRENT:  {'name': ['input', 'pv5', 'Current'],               'level': logging.DEBUG, 'unit': 'A',    'ha': {'dev': 'input_pv5', 'dev_cla': 'current', 'stat_cla': 'measurement', 'id': 'cur_pv5_',   'val_tpl': "{{ (value_json['pv5']['Current'] | float)}}", 'icon': 'mdi:gauge', 'ent_cat': 'diagnostic'}},  # noqa: E501
-        Register.PV5_POWER:    {'name': ['input', 'pv5', 'Power'],                 'level': logging.INFO,  'unit': 'W',    'ha': {'dev': 'input_pv5', 'dev_cla': 'power',   'stat_cla': 'measurement', 'id': 'power_pv5_', 'val_tpl': "{{ (value_json['pv5']['Power'] | float)}}"}},  # noqa: E501
+        Register.PV5_POWER:    {'name': ['input', 'pv5', 'Power'],                 'level': logging.DEBUG, 'unit': 'W',    'ha': {'dev': 'input_pv5', 'dev_cla': 'power',   'stat_cla': 'measurement', 'id': 'power_pv5_', 'val_tpl': "{{ (value_json['pv5']['Power'] | float)}}"}},  # noqa: E501
        Register.PV6_VOLTAGE:  {'name': ['input', 'pv6', 'Voltage'],               'level': logging.DEBUG, 'unit': 'V',    'ha': {'dev': 'input_pv6', 'dev_cla': 'voltage', 'stat_cla': 'measurement', 'id': 'volt_pv6_',  'val_tpl': "{{ (value_json['pv6']['Voltage'] | float)}}", 'icon': 'mdi:gauge', 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.PV6_CURRENT:  {'name': ['input', 'pv6', 'Current'],               'level': logging.DEBUG, 'unit': 'A',    'ha': {'dev': 'input_pv6', 'dev_cla': 'current', 'stat_cla': 'measurement', 'id': 'cur_pv6_',   'val_tpl': "{{ (value_json['pv6']['Current'] | float)}}", 'icon': 'mdi:gauge', 'ent_cat': 'diagnostic'}},  # noqa: E501
-        Register.PV6_POWER:    {'name': ['input', 'pv6', 'Power'],                 'level': logging.INFO,  'unit': 'W',    'ha': {'dev': 'input_pv6', 'dev_cla': 'power',   'stat_cla': 'measurement', 'id': 'power_pv6_', 'val_tpl': "{{ (value_json['pv6']['Power'] | float)}}"}},  # noqa: E501
+        Register.PV6_POWER:    {'name': ['input', 'pv6', 'Power'],                 'level': logging.DEBUG, 'unit': 'W',    'ha': {'dev': 'input_pv6', 'dev_cla': 'power',   'stat_cla': 'measurement', 'id': 'power_pv6_', 'val_tpl': "{{ (value_json['pv6']['Power'] | float)}}"}},  # noqa: E501
        Register.PV1_DAILY_GENERATION:  {'name': ['input', 'pv1', 'Daily_Generation'],        'level': logging.DEBUG, 'unit': 'kWh',  'ha': {'dev': 'input_pv1', 'dev_cla': 'energy', 'stat_cla': 'total_increasing', 'id': 'daily_gen_pv1_', 'name': 'Daily Generation', 'val_tpl': "{{ (value_json['pv1']['Daily_Generation'] | float)}}", 'icon': 'mdi:solar-power-variant', 'must_incr': True}},  # noqa: E501
        Register.PV1_TOTAL_GENERATION:  {'name': ['input', 'pv1', 'Total_Generation'],        'level': logging.DEBUG, 'unit': 'kWh',  'ha': {'dev': 'input_pv1', 'dev_cla': 'energy', 'stat_cla': 'total',            'id': 'total_gen_pv1_', 'name': 'Total Generation', 'val_tpl': "{{ (value_json['pv1']['Total_Generation'] | float)}}", 'icon': 'mdi:solar-power', 'must_incr': True}},  # noqa: E501
        Register.PV2_DAILY_GENERATION:  {'name': ['input', 'pv2', 'Daily_Generation'],        'level': logging.DEBUG, 'unit': 'kWh',  'ha': {'dev': 'input_pv2', 'dev_cla': 'energy', 'stat_cla': 'total_increasing', 'id': 'daily_gen_pv2_', 'name': 'Daily Generation', 'val_tpl': "{{ (value_json['pv2']['Daily_Generation'] | float)}}", 'icon': 'mdi:solar-power-variant', 'must_incr': True}},  # noqa: E501
@@ -285,13 +288,13 @@ class Infos:

        # controller:
        Register.SIGNAL_STRENGTH:    {'name': ['controller', 'Signal_Strength'],    'level': logging.DEBUG, 'unit': '%',    'ha': {'dev': 'controller', 'dev_cla': None,       'stat_cla': 'measurement', 'id': 'signal_',              'fmt': '| int',           'name': 'Signal Strength', 'icon': 'mdi:wifi'}},  # noqa: E501
-        Register.POWER_ON_TIME:      {'name': ['controller', 'Power_On_Time'],      'level': logging.DEBUG, 'unit': 's',    'ha': {'dev': 'controller', 'dev_cla': 'duration', 'stat_cla': 'measurement', 'id': 'power_on_time_',       'fmt': '| float',         'name': 'Power on Time', 'nat_prc': '3', 'ent_cat': 'diagnostic'}},  # noqa: E501
-        Register.COLLECT_INTERVAL:   {'name': ['controller', 'Collect_Interval'],   'level': logging.DEBUG, 'unit': 's',    'ha': {'dev': 'controller', 'dev_cla': None,       'stat_cla': None,          'id': 'data_collect_intval_', 'fmt': '| string + " s"', 'name': 'Data Collect Interval', 'icon': 'mdi:update', 'ent_cat': 'diagnostic'}},  # noqa: E501
+        Register.POWER_ON_TIME:      {'name': ['controller', 'Power_On_Time'],      'level': logging.DEBUG, 'unit': 's',    'ha': {'dev': 'controller', 'dev_cla': 'duration', 'stat_cla': 'measurement', 'id': 'power_on_time_',       'fmt': '| int',           'name': 'Power on Time', 'ent_cat': 'diagnostic'}},  # noqa: E501
+        Register.COLLECT_INTERVAL:   {'name': ['controller', 'Collect_Interval'],   'level': logging.DEBUG, 'unit': 'min',  'ha': {'dev': 'controller', 'dev_cla': None,       'stat_cla': None,          'id': 'data_collect_intval_', 'fmt': '| string + " min"', 'name': 'Data Collect Interval', 'icon': 'mdi:update', 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.CONNECT_COUNT:      {'name': ['controller', 'Connect_Count'],      'level': logging.DEBUG, 'unit': '',     'ha': {'dev': 'controller', 'dev_cla': None,       'stat_cla': None,          'id': 'connect_count_',       'fmt': '| int',           'name': 'Connect Count',    'icon': 'mdi:counter', 'comp': 'sensor', 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.COMMUNICATION_TYPE: {'name': ['controller', 'Communication_Type'], 'level': logging.DEBUG, 'unit': '',     'ha': {'dev': 'controller', 'dev_cla': None,       'stat_cla': None,          'id': 'comm_type_',           'name': 'Communication Type', 'val_tpl': __comm_type_val_tpl, 'comp': 'sensor', 'icon': 'mdi:wifi'}},  # noqa: E501
        Register.DATA_UP_INTERVAL:   {'name': ['controller', 'Data_Up_Interval'],   'level': logging.DEBUG, 'unit': 's',    'ha': {'dev': 'controller', 'dev_cla': None,       'stat_cla': None,          'id': 'data_up_intval_', 'fmt': '| string + " s"', 'name': 'Data Up Interval', 'icon': 'mdi:update', 'ent_cat': 'diagnostic'}},  # noqa: E501
        Register.HEARTBEAT_INTERVAL: {'name': ['controller', 'Heartbeat_Interval'], 'level': logging.DEBUG, 'unit': 's',    'ha': {'dev': 'controller', 'dev_cla': None,       'stat_cla': None,          'id': 'heartbeat_intval_',    'fmt': '| string + " s"', 'name': 'Heartbeat Interval', 'icon': 'mdi:update', 'ent_cat': 'diagnostic'}},  # noqa: E501
-        Register.IP_ADRESS:          {'name': ['controller', 'IP_Adress'],          'level': logging.DEBUG, 'unit': '',     'ha': {'dev': 'controller', 'dev_cla': None,       'stat_cla': None,          'id': 'ip_adress_',           'fmt': '| string',        'name': 'IP Adress', 'icon': 'mdi:wifi', 'ent_cat': 'diagnostic'}},  # noqa: E501
+        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': 'mdi:wifi', 'ent_cat': 'diagnostic'}},  # noqa: E501
    }

    @property
@@ -403,7 +406,7 @@ class Infos:
                attr['unit_of_meas'] = row['unit']  # 'unit_of_meas'
            if 'icon' in ha:
                attr['ic'] = ha['icon']             # icon for the entity
-            if 'nat_prc' in ha:
+            if 'nat_prc' in ha:  # pragma: no cover
                attr['sug_dsp_prc'] = ha['nat_prc']  # precison of floats
            if 'ent_cat' in ha:
                attr['ent_cat'] = ha['ent_cat']     # diagnostic, config
--- a/app/src/messages.py
+++ b/app/src/messages.py
@@ -1,10 +1,14 @@
 import logging
 import weakref
+from typing import Callable
+

 if __name__ == "app.src.messages":
    from app.src.infos import Infos
+    from app.src.modbus import Modbus
 else:  # pragma: no cover
    from infos import Infos
+    from modbus import Modbus

 logger = logging.getLogger('msg')

@@ -50,21 +54,31 @@ class IterRegistry(type):

 class Message(metaclass=IterRegistry):
    _registry = []
+    STATE_INIT = 0
+    STATE_UP = 2
+    STATE_CLOSED = 3

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

        self.server_side = server_side
+        if server_side:
+            self.mb = Modbus(send_modbus_cb, mb_timeout)
+        else:
+            self.mb = None
+
        self.header_valid = False
        self.header_len = 0
        self.data_len = 0
        self.unique_id = 0
-        self.node_id = ''
+        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 = self.STATE_INIT

    '''
    Empty methods, that have to be implemented in any child class which
@@ -82,6 +96,9 @@ class Message(metaclass=IterRegistry):
    Our puplic methods
    '''
    def close(self) -> None:
+        if self.mb:
+            del self.mb
+            self.mb = None
        pass  # pragma: no cover

    def inc_counter(self, counter: str) -> None:
--- a/app/src/modbus.py
+++ b/app/src/modbus.py
@@ -0,0 +1,309 @@
+'''MODBUS  module for TSUN inverter support
+
+TSUN uses the MODBUS in the RTU transmission mode over serial line.
+see: https://modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf
+see: https://modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
+
+A Modbus PDU consists of: 'Function-Code' + 'Data'
+A Modbus RTU message consists of: 'Addr' + 'Modbus-PDU' + 'CRC-16'
+The inverter is a MODBUS server and the proxy the MODBUS client.
+
+The 16-bit CRC is known as CRC-16-ANSI(reverse)
+see: https://en.wikipedia.org/wiki/Computation_of_cyclic_redundancy_checks
+'''
+import struct
+import logging
+import asyncio
+from typing import Generator, Callable
+
+if __name__ == "app.src.modbus":
+    from app.src.infos import Register
+else:  # pragma: no cover
+    from infos import Register
+
+logger = logging.getLogger('data')
+
+CRC_POLY = 0xA001  # (LSBF/reverse)
+CRC_INIT = 0xFFFF
+
+
+class Modbus():
+    '''Simple MODBUS implementation with TX queue and retransmit timer'''
+    INV_ADDR = 1
+    '''MODBUS server address of the TSUN inverter'''
+    READ_REGS = 3
+    '''MODBUS function code: Read Holding Register'''
+    READ_INPUTS = 4
+    '''MODBUS function code: Read Input Register'''
+    WRITE_SINGLE_REG = 6
+    '''Modbus function code: Write Single Register'''
+
+    __crc_tab = []
+    map = {
+        0x2007: {'reg': Register.MAX_DESIGNED_POWER,   'fmt': '!H', 'ratio':  1},  # noqa: E501
+        # 0x????: {'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}'"},  # 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
+        # 0x300d
+        0x300e: {'reg': Register.RATED_POWER,          'fmt': '!H', 'ratio':    1},  # noqa: E501
+        0x300f: {'reg': Register.OUTPUT_POWER,         'fmt': '!H', 'ratio':  0.1},  # noqa: E501
+        0x3010: {'reg': Register.PV1_VOLTAGE,          'fmt': '!H', 'ratio':  0.1},  # noqa: E501
+        0x3011: {'reg': Register.PV1_CURRENT,          'fmt': '!H', 'ratio': 0.01},  # noqa: E501
+        0x3012: {'reg': Register.PV1_POWER,            'fmt': '!H', 'ratio':  0.1},  # noqa: E501
+        0x3013: {'reg': Register.PV2_VOLTAGE,          'fmt': '!H', 'ratio':  0.1},  # noqa: E501
+        0x3014: {'reg': Register.PV2_CURRENT,          'fmt': '!H', 'ratio': 0.01},  # noqa: E501
+        0x3015: {'reg': Register.PV2_POWER,            'fmt': '!H', 'ratio':  0.1},  # noqa: E501
+        0x3016: {'reg': Register.PV3_VOLTAGE,          'fmt': '!H', 'ratio':  0.1},  # noqa: E501
+        0x3017: {'reg': Register.PV3_CURRENT,          'fmt': '!H', 'ratio': 0.01},  # noqa: E501
+        0x3018: {'reg': Register.PV3_POWER,            'fmt': '!H', 'ratio':  0.1},  # noqa: E501
+        0x3019: {'reg': Register.PV4_VOLTAGE,          'fmt': '!H', 'ratio':  0.1},  # noqa: E501
+        0x301a: {'reg': Register.PV4_CURRENT,          'fmt': '!H', 'ratio': 0.01},  # noqa: E501
+        0x301b: {'reg': Register.PV4_POWER,            'fmt': '!H', 'ratio':  0.1},  # noqa: E501
+        0x301c: {'reg': Register.DAILY_GENERATION,     'fmt': '!H', 'ratio': 0.01},  # noqa: E501
+        0x301d: {'reg': Register.TOTAL_GENERATION,     'fmt': '!L', 'ratio': 0.01},  # noqa: E501
+        0x301f: {'reg': Register.PV1_DAILY_GENERATION, 'fmt': '!H', 'ratio': 0.01},  # noqa: E501
+        0x3020: {'reg': Register.PV1_TOTAL_GENERATION, 'fmt': '!L', 'ratio': 0.01},  # noqa: E501
+        0x3022: {'reg': Register.PV2_DAILY_GENERATION, 'fmt': '!H', 'ratio': 0.01},  # noqa: E501
+        0x3023: {'reg': Register.PV2_TOTAL_GENERATION, 'fmt': '!L', 'ratio': 0.01},  # noqa: E501
+        0x3025: {'reg': Register.PV3_DAILY_GENERATION, 'fmt': '!H', 'ratio': 0.01},  # noqa: E501
+        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
+    }
+
+    def __init__(self, snd_handler: Callable[[bytes, int, str], None],
+                 timeout: int = 1):
+        if not len(self.__crc_tab):
+            self.__build_crc_tab(CRC_POLY)
+        self.que = asyncio.Queue(100)
+        self.snd_handler = snd_handler
+        '''Send handler to transmit a MODBUS RTU request'''
+        self.rsp_handler = None
+        '''Response handler to forward the response'''
+        self.timeout = timeout
+        '''MODBUS response timeout in seconds'''
+        self.max_retries = 1
+        '''Max retransmit for MODBUS requests'''
+        self.retry_cnt = 0
+        self.last_req = b''
+        self.counter = {}
+        '''Dictenary with statistic counter'''
+        self.counter['timeouts'] = 0
+        self.counter['retries'] = {}
+        for i in range(0, self.max_retries+1):
+            self.counter['retries'][f'{i}'] = 0
+        self.last_log_lvl = logging.DEBUG
+        self.last_addr = 0
+        self.last_fcode = 0
+        self.last_len = 0
+        self.last_reg = 0
+        self.err = 0
+        self.loop = asyncio.get_event_loop()
+        self.req_pend = False
+        self.tim = None
+
+    def __del__(self):
+        logging.debug(f'Modbus __del__:\n {self.counter}')
+
+    def build_msg(self, addr: int, func: int, reg: int, val: int,
+                  log_lvl=logging.DEBUG) -> None:
+        """Build MODBUS RTU request frame and add it to the tx queue
+
+        Keyword arguments:
+            addr: RTU server address (inverter)
+            func: MODBUS function code
+            reg:  16-bit register number
+            val:  16 bit value
+        """
+        msg = struct.pack('>BBHH', addr, func, reg, val)
+        msg += struct.pack('<H', self.__calc_crc(msg))
+        self.que.put_nowait({'req': msg,
+                             'rsp_hdl': None,
+                             'log_lvl': log_lvl})
+        if self.que.qsize() == 1:
+            self.__send_next_from_que()
+
+    def recv_req(self, buf: bytearray,
+                 rsp_handler: Callable[[None], None] = None) -> bool:
+        """Add the received Modbus RTU request to the tx queue
+
+        Keyword arguments:
+            buf: Modbus RTU pdu incl ADDR byte and trailing CRC
+            rsp_handler: Callback, if the received pdu is valid
+
+        Returns:
+            True:   PDU was added to the queue
+            False:  PDU was ignored, due to an error
+        """
+        # logging.info(f'recv_req: first byte modbus:{buf[0]} len:{len(buf)}')
+        if not self.__check_crc(buf):
+            self.err = 1
+            logger.error('Modbus recv: CRC error')
+            return False
+        self.que.put_nowait({'req': buf,
+                             'rsp_hdl': rsp_handler,
+                             'log_lvl': logging.INFO})
+        if self.que.qsize() == 1:
+            self.__send_next_from_que()
+
+        return True
+
+    def recv_resp(self, info_db, buf: bytearray, node_id: str) -> \
+            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
+            2: Wrong server address
+            3: Unexpected function code
+            4: Unexpected data length
+            5: No MODBUS request pending
+        """
+        # logging.info(f'recv_resp: first byte modbus:{buf[0]} len:{len(buf)}')
+        if not self.req_pend:
+            self.err = 5
+            return
+        if not self.__check_crc(buf):
+            logger.error(f'[{node_id}] Modbus resp: CRC error')
+            self.err = 1
+            return
+        if buf[0] != self.last_addr:
+            logger.info(f'[{node_id}] Modbus resp: Wrong addr {buf[0]}')
+            self.err = 2
+            return
+        fcode = buf[1]
+        if fcode != self.last_fcode:
+            logger.info(f'[{node_id}] Modbus: Wrong fcode {fcode}'
+                        f' != {self.last_fcode}')
+            self.err = 3
+            return
+        if self.last_addr == self.INV_ADDR and \
+                (fcode == 3 or fcode == 4):
+            elmlen = buf[2] >> 1
+            if elmlen != self.last_len:
+                logger.info(f'[{node_id}] Modbus: len error {elmlen}'
+                            f' != {self.last_len}')
+                self.err = 4
+                return
+            first_reg = self.last_reg  # save last_reg before sending next pdu
+            self.__stop_timer()          # stop timer and send next pdu
+
+            for i in range(0, elmlen):
+                addr = first_reg+i
+                if addr in self.map:
+                    row = self.map[addr]
+                    info_id = row['reg']
+                    fmt = row['fmt']
+                    val = struct.unpack_from(fmt, buf, 3+2*i)
+                    result = val[0]
+
+                    if 'eval' in row:
+                        result = eval(row['eval'])
+                    if 'ratio' in row:
+                        result = round(result * row['ratio'], 2)
+
+                    keys, level, unit, must_incr = info_db._key_obj(info_id)
+
+                    if keys:
+                        name, update = info_db.update_db(keys, must_incr,
+                                                         result)
+                        yield keys[0], update, result
+                        if update:
+                            info_db.tracer.log(level,
+                                               f'[{node_id}] MODBUS: {name}'
+                                               f' : {result}{unit}')
+        else:
+            self.__stop_timer()
+
+        self.counter['retries'][f'{self.retry_cnt}'] += 1
+        if self.rsp_handler:
+            self.rsp_handler()
+        self.__send_next_from_que()
+
+    '''
+    MODBUS response timer
+    '''
+    def __start_timer(self) -> None:
+        '''Start response timer and set `req_pend` to True'''
+        self.req_pend = True
+        self.tim = self.loop.call_later(self.timeout, self.__timeout_cb)
+        # logging.debug(f'Modbus start timer {self}')
+
+    def __stop_timer(self) -> None:
+        '''Stop response timer and set `req_pend` to False'''
+        self.req_pend = False
+        # logging.debug(f'Modbus stop timer {self}')
+        if self.tim:
+            self.tim.cancel()
+
+    def __timeout_cb(self) -> None:
+        '''Rsponse timeout handler retransmit pdu or send next pdu'''
+        self.req_pend = False
+
+        if self.retry_cnt < self.max_retries:
+            logger.debug(f'Modbus retrans {self}')
+            self.retry_cnt += 1
+            self.__start_timer()
+            self.snd_handler(self.last_req, self.last_log_lvl, state='Retrans')
+        else:
+            logger.info(f'Modbus timeout {self}')
+            self.counter['timeouts'] += 1
+            self.__send_next_from_que()
+
+    def __send_next_from_que(self) -> None:
+        '''Get next MODBUS pdu from queue and transmit it'''
+        if self.req_pend:
+            return
+        try:
+            item = self.que.get_nowait()
+            req = item['req']
+            self.last_req = req
+            self.rsp_handler = item['rsp_hdl']
+            self.last_log_lvl = item['log_lvl']
+            self.last_addr = req[0]
+            self.last_fcode = req[1]
+
+            res = struct.unpack_from('>HH', req, 2)
+            self.last_reg = res[0]
+            self.last_len = res[1]
+            self.retry_cnt = 0
+            self.__start_timer()
+            self.snd_handler(self.last_req, self.last_log_lvl, state='Command')
+        except asyncio.QueueEmpty:
+            pass
+
+    '''
+    Helper function for CRC-16 handling
+    '''
+    def __check_crc(self, msg: bytearray) -> bool:
+        '''Check CRC-16 and returns True if valid'''
+        return 0 == self.__calc_crc(msg)
+
+    def __calc_crc(self, buffer: bytearray) -> int:
+        '''Build CRC-16 for buffer and returns it'''
+        crc = CRC_INIT
+
+        for cur in buffer:
+            crc = (crc >> 8) ^ self.__crc_tab[(crc ^ cur) & 0xFF]
+        return crc
+
+    def __build_crc_tab(self, poly: int) -> None:
+        '''Build CRC-16 helper table, must be called exactly one time'''
+        for index in range(256):
+            data = index << 1
+            crc = 0
+            for _ in range(8, 0, -1):
+                data >>= 1
+                if (data ^ crc) & 1:
+                    crc = (crc >> 1) ^ poly
+                else:
+                    crc >>= 1
+            self.__crc_tab.append(crc)
--- a/app/src/mqtt.py
+++ b/app/src/mqtt.py
@@ -1,22 +1,15 @@
 import asyncio
 import logging
 import aiomqtt
+import traceback
+from modbus import Modbus
+from messages import Message
 from config import Config
+from singleton import Singleton

 logger_mqtt = logging.getLogger('mqtt')


-class Singleton(type):
-    _instances = {}
-
-    def __call__(cls, *args, **kwargs):
-        logger_mqtt.debug('singleton: __call__')
-        if cls not in cls._instances:
-            cls._instances[cls] = super(Singleton,
-                                        cls).__call__(*args, **kwargs)
-        return cls._instances[cls]
-
-
 class Mqtt(metaclass=Singleton):
    __client = None
    __cb_MqttIsUp = None
@@ -65,6 +58,12 @@ class Mqtt(metaclass=Singleton):
                                       password=mqtt['passwd'])

        interval = 5  # Seconds
+        ha_status_topic = f"{ha['auto_conf_prefix']}/status"
+        mb_rated_topic = "tsun/+/rated_load"  # fixme
+        mb_reads_topic = "tsun/+/modbus_read_regs"  # fixme
+        mb_inputs_topic = "tsun/+/modbus_read_inputs"  # fixme
+        mb_at_cmd_topic = "tsun/+/at_cmd"  # fixme
+
        while True:
            try:
                async with self.__client:
@@ -74,16 +73,36 @@ class Mqtt(metaclass=Singleton):
                        await self.__cb_MqttIsUp()

                    # async with self.__client.messages() as messages:
-                    await self.__client.subscribe(
-                        f"{ha['auto_conf_prefix']}"
-                        "/status")
+                    await self.__client.subscribe(ha_status_topic)
+                    await self.__client.subscribe(mb_rated_topic)
+                    await self.__client.subscribe(mb_reads_topic)
+                    await self.__client.subscribe(mb_inputs_topic)
+                    await self.__client.subscribe(mb_at_cmd_topic)
+
                    async for message in self.__client.messages:
-                        status = message.payload.decode("UTF-8")
-                        logger_mqtt.info('Home-Assistant Status:'
-                                         f' {status}')
-                        if status == 'online':
-                            self.ha_restarts += 1
-                            await self.__cb_MqttIsUp()
+                        if message.topic.matches(ha_status_topic):
+                            status = message.payload.decode("UTF-8")
+                            logger_mqtt.info('Home-Assistant Status:'
+                                             f' {status}')
+                            if status == 'online':
+                                self.ha_restarts += 1
+                                await self.__cb_MqttIsUp()
+
+                        if message.topic.matches(mb_rated_topic):
+                            await self.modbus_cmd(message,
+                                                  Modbus.WRITE_SINGLE_REG,
+                                                  1, 0x2008)
+
+                        if message.topic.matches(mb_reads_topic):
+                            await self.modbus_cmd(message,
+                                                  Modbus.READ_REGS, 2)
+
+                        if message.topic.matches(mb_inputs_topic):
+                            await self.modbus_cmd(message,
+                                                  Modbus.READ_INPUTS, 2)
+
+                        if message.topic.matches(mb_at_cmd_topic):
+                            await self.at_cmd(message)

            except aiomqtt.MqttError:
                if Config.is_default('mqtt'):
@@ -101,3 +120,54 @@ class Mqtt(metaclass=Singleton):
                logger_mqtt.debug("MQTT task cancelled")
                self.__client = None
                return
+            except Exception:
+                # self.inc_counter('SW_Exception')   # fixme
+                logger_mqtt.error(
+                    f"Exception:\n"
+                    f"{traceback.format_exc()}")
+
+    def each_inverter(self, message, func_name: str):
+        topic = str(message.topic)
+        node_id = topic.split('/')[1] + '/'
+        found = False
+        for m in Message:
+            if m.server_side and (m.node_id == node_id):
+                found = True
+                logger_mqtt.debug(f'Found: {node_id}')
+                fnc = getattr(m, func_name, None)
+                if callable(fnc):
+                    yield fnc
+                else:
+                    logger_mqtt.warning(f'Cmd not supported by: {node_id}')
+
+        if not found:
+            logger_mqtt.warning(f'Node_id: {node_id} not found')
+
+    async def modbus_cmd(self, message, func, params=0, addr=0, val=0):
+        topic = str(message.topic)
+        node_id = topic.split('/')[1] + '/'
+        # refactor into a loop over a table
+        payload = message.payload.decode("UTF-8")
+        logger_mqtt.info(f'MODBUS via MQTT: {topic} = {payload}')
+        for m in Message:
+            if m.server_side and (m.node_id == node_id):
+                logger_mqtt.debug(f'Found: {node_id}')
+                fnc = getattr(m, "send_modbus_cmd", None)
+                res = payload.split(',')
+                if params != len(res):
+                    logger_mqtt.error(f'Parameter expected: {params}, '
+                                      f'got: {len(res)}')
+                    return
+
+                if callable(fnc):
+                    if params == 1:
+                        val = int(payload)
+                    elif params == 2:
+                        addr = int(res[0], base=16)
+                        val = int(res[1])  # lenght
+                    await fnc(func, addr, val, logging.INFO)
+
+    async def at_cmd(self, message):
+        payload = message.payload.decode("UTF-8")
+        for fnc in self.each_inverter(message, "send_at_cmd"):
+            await fnc(payload)
--- a/app/src/scheduler.py
+++ b/app/src/scheduler.py
@@ -3,21 +3,26 @@ import json
 from mqtt import Mqtt
 from aiocron import crontab
 from infos import ClrAtMidnight
+from modbus import Modbus
+from messages import Message

 logger_mqtt = logging.getLogger('mqtt')


 class Schedule:
    mqtt = None
+    count = 0

    @classmethod
    def start(cls) -> None:
        '''Start the scheduler and schedule the tasks (cron jobs)'''
-        logging.info("Scheduler init")
+        logging.debug("Scheduler init")
        cls.mqtt = Mqtt(None)

        crontab('0 0 * * *', func=cls.atmidnight, start=True)
-        # crontab('*/5 * * * *', func=cls.atmidnight, start=True)
+
+        # every minute
+        crontab('* * * * *', func=cls.regular_modbus_cmds, start=True)

    @classmethod
    async def atmidnight(cls) -> None:
@@ -28,3 +33,15 @@ class Schedule:
            logger_mqtt.debug(f'{key}: {data}')
            data_json = json.dumps(data)
            await cls.mqtt.publish(f"{key}", data_json)
+
+    @classmethod
+    async def regular_modbus_cmds(cls):
+        for m in Message:
+            if m.server_side:
+                fnc = getattr(m, "send_modbus_cmd", None)
+                if callable(fnc):
+                    await fnc(Modbus.READ_REGS, 0x3008, 21, logging.DEBUG)
+                    # if 0 == (cls.count % 30):
+                    #     # logging.info("Regular Modbus Status request")
+                    #     await fnc(Modbus.READ_REGS, 0x2007, 2, logging.DEBUG)
+        cls.count += 1
--- a/app/src/server.py
+++ b/app/src/server.py
@@ -1,7 +1,6 @@
 import logging
 import asyncio
 import signal
-import functools
 import os
 from logging import config  # noqa F401
 from messages import Message
@@ -26,13 +25,23 @@ async def handle_client_v2(reader, writer):
    await InverterG3P(reader, writer, addr).server_loop(addr)


-def handle_SIGTERM(loop):
+async def handle_shutdown(loop):
    '''Close all TCP connections and stop the event loop'''

    logging.info('Shutdown due to SIGTERM')

    #
-    # first, close all open TCP connections
+    # first, disc all open TCP connections gracefully
+    #
+    for stream in Message:
+        try:
+            await asyncio.wait_for(stream.disc(), 2)
+        except Exception:
+            pass
+    logging.info('Disconnecting done')
+
+    #
+    # second, close all open TCP connections
    #
    for stream in Message:
        stream.close()
@@ -74,10 +83,11 @@ if __name__ == "__main__":
    logging.getLogger('msg').setLevel(log_level)
    logging.getLogger('conn').setLevel(log_level)
    logging.getLogger('data').setLevel(log_level)
+    logging.getLogger('tracer').setLevel(log_level)
    # logging.getLogger('mqtt').setLevel(log_level)

    # read config file
-    Config.read()
+    Config.class_init()

    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
@@ -91,7 +101,8 @@ if __name__ == "__main__":
    #
    for signame in ('SIGINT', 'SIGTERM'):
        loop.add_signal_handler(getattr(signal, signame),
-                                functools.partial(handle_SIGTERM, loop))
+                                lambda loop=loop: asyncio.create_task(
+                                    handle_shutdown(loop)))

    #
    # Create taska for our listening servera. These must be tasks! If we call
--- a/app/src/singleton.py
+++ b/app/src/singleton.py
@@ -0,0 +1,9 @@
+class Singleton(type):
+    _instances = {}
+
+    def __call__(cls, *args, **kwargs):
+        # logger_mqtt.debug('singleton: __call__')
+        if cls not in cls._instances:
+            cls._instances[cls] = super(Singleton,
+                                        cls).__call__(*args, **kwargs)
+        return cls._instances[cls]
--- a/app/tests/test_config.py
+++ b/app/tests/test_config.py
@@ -0,0 +1,142 @@
+# test_with_pytest.py
+import tomllib
+from schema import SchemaMissingKeyError
+from app.src.config import Config
+
+class TstConfig(Config):
+
+    @classmethod
+    def set(cls, cnf):
+        cls.config = cnf
+
+    @classmethod
+    def _read_config_file(cls) -> dict:
+        return cls.config
+
+
+def test_empty_config():
+    cnf = {}
+    try:
+        Config.conf_schema.validate(cnf)
+        assert False
+    except SchemaMissingKeyError:
+        assert True
+
+def test_default_config():
+    with open("app/config/default_config.toml", "rb") as f:
+        cnf = tomllib.load(f)
+
+    try:
+        validated = Config.conf_schema.validate(cnf)
+        assert True
+    except:
+        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': '', 'monitor_sn': 0, 'suggested_area': ''}, 'Y170000000000001': {'monitor_sn': 2000000000, 'node_id': '', 'suggested_area': ''}}}
+
+def test_full_config():
+    cnf = {'tsun': {'enabled': True, 'host': 'logger.talent-monitoring.com', 'port': 5005}, 
+           'gen3plus': {'at_acl': {'mqtt': {'allow': ['AT+'], 'block': []},
+                                   'tsun': {'allow': ['AT+Z', 'AT+UPURL', 'AT+SUPDATE'], 'block': []}}},
+           'solarman': {'enabled': True, 'host': 'iot.talent-monitoring.com', 'port': 10000}, 
+           'mqtt': {'host': 'mqtt', 'port': 1883, 'user': '', 'passwd': ''}, 
+           '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': '', 'suggested_area': '', 'pv1': {'type': 'type1', 'manufacturer': 'man1'}, 'pv2': {'type': 'type2', 'manufacturer': 'man2'}, 'pv3': {'type': 'type3', 'manufacturer': 'man3'}}, 
+                         'Y170000000000001': {'monitor_sn': 2000000000, 'node_id': '', 'suggested_area': ''}}}
+    try:
+        validated = Config.conf_schema.validate(cnf)
+        assert True
+    except:
+        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': '', 'monitor_sn': 0, 'pv1': {'manufacturer': 'man1','type': 'type1'},'pv2': {'manufacturer': 'man2','type': 'type2'},'pv3': {'manufacturer': 'man3','type': 'type3'}, 'suggested_area': ''}, 'Y170000000000001': {'monitor_sn': 2000000000, 'node_id': '', 'suggested_area': ''}}}
+
+def test_mininum_config():
+    cnf = {'tsun': {'enabled': True, 'host': 'logger.talent-monitoring.com', 'port': 5005}, 
+           'gen3plus': {'at_acl': {'mqtt': {'allow': ['AT+']},
+                                   'tsun': {'allow': ['AT+Z', 'AT+UPURL', 'AT+SUPDATE']}}},
+           'solarman': {'enabled': True, 'host': 'iot.talent-monitoring.com', 'port': 10000}, 
+           'mqtt': {'host': 'mqtt', 'port': 1883, 'user': '', 'passwd': ''}, 
+           'ha': {'auto_conf_prefix': 'homeassistant', 'discovery_prefix': 'homeassistant', 'entity_prefix': 'tsun', 'proxy_node_id': 'proxy', 'proxy_unique_id': 'P170000000000001'}, 
+           'inverters': {'allow_all': True,
+                         'R170000000000001': {}}
+    } 
+
+    try:
+        validated = Config.conf_schema.validate(cnf)
+        assert True
+    except:
+        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': '', 'monitor_sn': 0, 'suggested_area': ''}}}
+
+def test_read_empty():
+    cnf = {}
+    TstConfig.set(cnf)
+    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': '', 'monitor_sn': 0, 'node_id': ''}, 'Y170000000000001': {'monitor_sn': 2000000000, 'suggested_area': '', 'node_id': ''}}}
+    
+    defcnf = TstConfig.def_config.get('solarman') 
+    assert defcnf == {'enabled': True, 'host': 'iot.talent-monitoring.com', 'port': 10000}
+    assert True == TstConfig.is_default('solarman')
+
+def test_no_file():
+    cnf = {}
+    TstConfig.set(cnf)
+    err = TstConfig.read('')
+    assert err == "Config.read: [Errno 2] No such file or directory: 'default_config.toml'"
+    cnf = TstConfig.get()
+    assert cnf == {}    
+    defcnf = TstConfig.def_config.get('solarman') 
+    assert defcnf == None
+
+def test_read_cnf1():
+    cnf = {'solarman' : {'enabled': False}}
+    TstConfig.set(cnf)
+    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': '', 'monitor_sn': 0, 'node_id': ''}, 'Y170000000000001': {'monitor_sn': 2000000000, 'suggested_area': '', 'node_id': ''}}}
+    cnf = TstConfig.get('solarman')
+    assert cnf == {'enabled': False, 'host': 'iot.talent-monitoring.com', 'port': 10000}    
+    defcnf = TstConfig.def_config.get('solarman') 
+    assert defcnf == {'enabled': True, 'host': 'iot.talent-monitoring.com', 'port': 10000}
+    assert False == TstConfig.is_default('solarman')
+                   
+def test_read_cnf2():
+    cnf = {'solarman' : {'enabled': 'FALSE'}}
+    TstConfig.set(cnf)
+    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': '', 'monitor_sn': 0, 'node_id': ''}, 'Y170000000000001': {'monitor_sn': 2000000000, 'suggested_area': '', 'node_id': ''}}}
+    assert True == TstConfig.is_default('solarman')
+
+def test_read_cnf3():
+    cnf = {'solarman' : {'port': 'FALSE'}}
+    TstConfig.set(cnf)
+    err = TstConfig.read('app/config/')
+    assert err == 'Config.read: Key \'solarman\' error:\nKey \'port\' error:\nint(\'FALSE\') raised ValueError("invalid literal for int() with base 10: \'FALSE\'")'
+    cnf = TstConfig.get()
+    assert cnf == {'solarman': {'port': 'FALSE'}}
+
+def test_read_cnf4():
+    cnf = {'solarman' : {'port': 5000}}
+    TstConfig.set(cnf)
+    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': '', 'monitor_sn': 0, 'node_id': ''}, 'Y170000000000001': {'monitor_sn': 2000000000, 'suggested_area': '', 'node_id': ''}}}
+    assert False == TstConfig.is_default('solarman')
+
+def test_read_cnf5():
+    cnf = {'solarman' : {'port': 1023}}
+    TstConfig.set(cnf)
+    err = TstConfig.read('app/config/')
+    assert err != None
+
+def test_read_cnf6():
+    cnf = {'solarman' : {'port': 65536}}
+    TstConfig.set(cnf)
+    err = TstConfig.read('app/config/')
+    assert err != None
--- a/app/tests/test_infos.py
+++ b/app/tests/test_infos.py
@@ -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}})
+    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}})
                                            
    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}})
+    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}})
    val = i.dev_value(Register.INVERTER_CNT)
    assert val == 1

--- a/app/tests/test_infos_g3p.py
+++ b/app/tests/test_infos_g3p.py
@@ -70,7 +70,7 @@ def test_parse_4110(DeviceData: bytes):
        pass

    assert json.dumps(i.db) == json.dumps({
-        'controller': {"Data_Up_Interval": 300, "Collect_Interval": 60, "Heartbeat_Interval": 120, "Signal_Strength": 100, "IP_Adress": "192.168.80.49"},
+        'controller': {"Data_Up_Interval": 300, "Collect_Interval": 1, "Heartbeat_Interval": 120, "Signal_Strength": 100, "IP_Address": "192.168.80.49"},
        'collector': {"Chip_Model": "LSW5BLE_17_02B0_1.05", "Collector_Fw_Version": "V1.1.00.0B"},
        })

@@ -83,7 +83,7 @@ def test_parse_4210(InverterData: bytes):

    assert json.dumps(i.db) == json.dumps({
         "controller": {"Power_On_Time": 2051}, 
-         "inverter": {"Serial_Number": "Y17E00000000000E", "Version": "v4.0.10", "Rated_Power": 600, "Max_Designed_Power": 2000, "No_Inputs": 4}, 
+         "inverter": {"Serial_Number": "Y17E00000000000E", "Version": "V4.0.10", "Rated_Power": 600, "Max_Designed_Power": 2000, "No_Inputs": 4}, 
         "env": {"Inverter_Status": 1, "Inverter_Temp": 14}, 
         "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}, 
--- a/app/tests/test_modbus.py
+++ b/app/tests/test_modbus.py
@@ -0,0 +1,380 @@
+# test_with_pytest.py
+import pytest
+import asyncio
+from app.src.modbus import Modbus
+from app.src.infos import Infos, Register
+
+pytest_plugins = ('pytest_asyncio',)
+pytestmark = pytest.mark.asyncio(scope="module")
+
+class TestHelper(Modbus):
+    def __init__(self):
+        super().__init__(self.send_cb)
+        self.db = Infos()
+        self.pdu = None
+        self.send_calls = 0
+        self.recv_responses = 0
+    def send_cb(self, pdu: bytearray, log_lvl: int, state: str):
+        self.pdu = pdu
+        self.send_calls += 1
+    def resp_handler(self):
+        self.recv_responses += 1
+
+def test_modbus_crc():
+    '''Check CRC-16 calculation'''
+    mb = Modbus(None)
+    assert 0x0b02 == mb._Modbus__calc_crc(b'\x01\x06\x20\x08\x00\x04')
+    assert 0 == mb._Modbus__calc_crc(b'\x01\x06\x20\x08\x00\x04\x02\x0b')
+    assert mb._Modbus__check_crc(b'\x01\x06\x20\x08\x00\x04\x02\x0b')
+
+    assert 0xc803 == mb._Modbus__calc_crc(b'\x01\x06\x20\x08\x00\x00')
+    assert 0 == mb._Modbus__calc_crc(b'\x01\x06\x20\x08\x00\x00\x03\xc8')
+    assert mb._Modbus__check_crc(b'\x01\x06\x20\x08\x00\x00\x03\xc8')
+
+    assert 0x5c75 == mb._Modbus__calc_crc(b'\x01\x03\x08\x01\x2c\x00\x2c\x02\x2c\x2c\x46')
+    
+def test_build_modbus_pdu():
+    '''Check building and sending a MODBUS RTU'''
+    mb = TestHelper()
+    mb.build_msg(1,6,0x2000,0x12)
+    assert mb.pdu == b'\x01\x06\x20\x00\x00\x12\x02\x07'
+    assert mb._Modbus__check_crc(mb.pdu)
+    assert mb.last_addr == 1
+    assert mb.last_fcode == 6   
+    assert mb.last_reg == 0x2000
+    assert mb.last_len == 18
+    assert mb.err == 0
+
+def test_recv_req():
+    '''Receive a valid request, which must transmitted'''
+    mb = TestHelper()
+    assert mb.recv_req(b'\x01\x06\x20\x00\x00\x12\x02\x07')
+    assert mb.last_fcode == 6
+    assert mb.last_reg == 0x2000
+    assert mb.last_len == 0x12
+    assert mb.err == 0
+
+def test_recv_req_crc_err():
+    '''Receive a request with invalid CRC, which must be dropped'''
+    mb = TestHelper()
+    assert not mb.recv_req(b'\x01\x06\x20\x00\x00\x12\x02\x08')
+    assert mb.pdu == None
+    assert mb.last_fcode == 0   
+    assert mb.last_reg == 0
+    assert mb.last_len == 0
+    assert mb.err == 1
+
+def test_recv_resp_crc_err():
+    '''Receive a response with invalid CRC, which must be dropped'''
+    mb = TestHelper()
+    # simulate a transmitted request
+    mb.req_pend = True
+    mb.last_addr = 1
+    mb.last_fcode = 3   
+    mb.last_reg == 0x300e
+    mb.last_len == 2
+    # 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'):
+        call += 1
+    assert mb.err == 1
+    assert 0 == call
+    assert mb.req_pend == True
+    # cleanup queue
+    mb._Modbus__stop_timer()
+    assert not mb.req_pend
+
+def test_recv_resp_invalid_addr():
+    '''Receive a response with wrong server addr, which must be dropped'''
+    mb = TestHelper()
+    mb.req_pend = True
+    # simulate a transmitted request
+    mb.last_addr = 1
+    mb.last_fcode = 3   
+    mb.last_reg == 0x300e
+    mb.last_len == 2
+
+    # 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'):
+        call += 1
+    assert mb.err == 2
+    assert 0 == call
+    assert mb.req_pend == True
+    assert mb.que.qsize() == 0
+    
+    # cleanup queue
+    mb._Modbus__stop_timer()
+    assert not mb.req_pend
+
+def test_recv_recv_fcode():
+    '''Receive a response with wrong function code, which must be dropped'''
+    mb = TestHelper()
+    mb.build_msg(1,4,0x300e,2)
+    assert mb.que.qsize() == 0
+    assert mb.req_pend
+   
+    # 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'):
+        call += 1
+
+    assert mb.err == 3
+    assert 0 == call
+    assert mb.req_pend == True
+    assert mb.que.qsize() == 0
+
+    # cleanup queue
+    mb._Modbus__stop_timer()
+    assert not mb.req_pend
+
+def test_recv_resp_len():
+    '''Receive a response with wrong data length, which must be dropped'''
+    mb = TestHelper()
+    mb.build_msg(1,3,0x300e,3)
+    assert mb.que.qsize() == 0
+    assert mb.req_pend
+    assert mb.last_len == 3
+
+    # 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'):
+        call += 1
+
+    assert mb.err == 4
+    assert 0 == call
+    assert mb.req_pend == True
+    assert mb.que.qsize() == 0
+
+    # cleanup queue
+    mb._Modbus__stop_timer()
+    assert not mb.req_pend
+
+def test_recv_unexpect_resp():
+    '''Receive a response when we havb't sent a request'''
+    mb = TestHelper()
+    assert not mb.req_pend
+   
+    # 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'):
+        call += 1
+
+    assert mb.err == 5
+    assert 0 == call
+    assert mb.req_pend == False
+    assert mb.que.qsize() == 0
+
+def test_parse_resp():
+    '''Receive matching response and parse the values'''
+    mb = TestHelper()
+    mb.build_msg(1,3,0x3007,6)
+    assert mb.que.qsize() == 0
+    assert mb.req_pend
+
+    call = 0
+    exp_result = ['V0.0.212', 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'):
+        if key == 'grid':
+            assert update == True
+        elif key == 'inverter':
+            assert update == True
+        elif key == 'env':
+            assert update == True
+        else:
+            assert False
+        assert exp_result[call] == val
+        call += 1
+    assert 0 == mb.err
+    assert 5 == call
+    assert mb.que.qsize() == 0
+    assert not mb.req_pend
+
+def test_queue():
+    mb = TestHelper()
+    mb.build_msg(1,3,0x3022,4)
+    assert mb.que.qsize() == 0
+    assert mb.req_pend
+
+    assert mb.send_calls == 1
+    assert mb.pdu == b'\x01\x030"\x00\x04\xeb\x03'
+    mb.pdu = None
+    assert mb.send_calls == 1
+    assert mb.pdu == None
+
+    assert mb.que.qsize() == 0
+
+    # cleanup queue
+    mb._Modbus__stop_timer()
+    assert not mb.req_pend
+
+def test_queue2():
+    '''Check queue handling for build_msg() calls'''
+    mb = TestHelper()
+    mb.build_msg(1,3,0x3007,6)
+    mb.build_msg(1,6,0x2008,4)
+    assert mb.que.qsize() == 1
+    assert mb.req_pend
+    mb.build_msg(1,3,0x3007,6)
+    assert mb.que.qsize() == 2
+    assert mb.req_pend
+
+    assert mb.send_calls == 1
+    assert mb.pdu == b'\x01\x030\x07\x00\x06{\t'
+    call = 0
+    exp_result = ['V0.0.212', 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'):
+        if key == 'grid':
+            assert update == True
+        elif key == 'inverter':
+            assert update == True
+        elif key == 'env':
+            assert update == True
+        else:
+            assert False
+        assert exp_result[call] == val
+        call += 1
+    assert 0 == mb.err
+    assert 5 == call
+
+    assert mb.que.qsize() == 1
+    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'):
+        pass
+
+    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'):
+        call += 1
+    assert 0 == mb.err
+    assert 5 == call
+
+    assert mb.que.qsize() == 0
+    assert not mb.req_pend
+
+def test_queue3():
+    '''Check queue handling for recv_req() calls'''
+    mb = TestHelper()
+    assert mb.recv_req(b'\x01\x03\x30\x07\x00\x06{\t', mb.resp_handler)
+    assert mb.recv_req(b'\x01\x06\x20\x08\x00\x04\x02\x0b', mb.resp_handler)
+    assert mb.que.qsize() == 1
+    assert mb.req_pend
+    assert mb.recv_req(b'\x01\x03\x30\x07\x00\x06{\t')
+    assert mb.que.qsize() == 2
+    assert mb.req_pend
+
+    assert mb.send_calls == 1
+    assert mb.pdu == b'\x01\x030\x07\x00\x06{\t'
+    assert mb.recv_responses == 0
+
+    call = 0
+    exp_result = ['V0.0.212', 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'):
+        if key == 'grid':
+            assert update == True
+        elif key == 'inverter':
+            assert update == True
+        elif key == 'env':
+            assert update == True
+        else:
+            assert False
+        assert exp_result[call] == val
+        call += 1
+    assert 0 == mb.err
+    assert 5 == call
+    assert mb.recv_responses == 1
+
+    assert mb.que.qsize() == 1
+    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'):
+        pass
+    assert 0 == mb.err
+    assert mb.recv_responses == 2
+
+    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'):
+        call += 1
+    assert 0 == mb.err
+    assert mb.recv_responses == 2
+    assert 5 == call
+
+
+    assert mb.que.qsize() == 0
+    assert not mb.req_pend
+
+@pytest.mark.asyncio
+async def test_timeout():
+    '''Test MODBUS response timeout and RTU retransmitting'''
+    assert asyncio.get_running_loop()
+    mb = TestHelper()
+    mb.max_retries = 2
+    mb.timeout = 0.1  # 100ms timeout for fast testing, expect a time resolution of at least 10ms
+    assert asyncio.get_running_loop() == mb.loop
+    mb.build_msg(1,3,0x3007,6)
+    mb.build_msg(1,6,0x2008,4)
+
+    assert mb.que.qsize() == 1
+    assert mb.req_pend
+    assert mb.retry_cnt == 0
+    assert mb.send_calls == 1
+    assert mb.pdu == b'\x01\x030\x07\x00\x06{\t'
+
+    mb.pdu = None
+    await asyncio.sleep(0.11)    # wait for first timeout and retransmittion
+    assert mb.que.qsize() == 1
+    assert mb.req_pend
+    assert mb.retry_cnt == 1
+    assert mb.send_calls == 2
+    assert mb.pdu == b'\x01\x030\x07\x00\x06{\t'
+
+    mb.pdu = None
+    await asyncio.sleep(0.11)    # wait for second timeout and retransmittion
+    assert mb.que.qsize() == 1
+    assert mb.req_pend
+    assert mb.retry_cnt == 2
+    assert mb.send_calls == 3
+    assert mb.pdu == b'\x01\x030\x07\x00\x06{\t'
+
+    mb.pdu = None
+    await asyncio.sleep(0.11)    # wait for third timeout and next pdu
+    assert mb.que.qsize() == 0
+    assert mb.req_pend
+    assert mb.retry_cnt == 0
+    assert mb.send_calls == 4
+    assert mb.pdu == b'\x01\x06\x20\x08\x00\x04\x02\x0b'
+
+    mb.max_retries = 0          # next pdu without retranmsission
+    await asyncio.sleep(0.11)    # wait for fourth timout
+    assert mb.que.qsize() == 0
+    assert not mb.req_pend
+    assert mb.retry_cnt == 0
+    assert mb.send_calls == 4
+
+    # assert mb.counter == {}
+
+def test_recv_unknown_data():
+    '''Receive a response with an unknwon register'''
+    mb = TestHelper()
+    assert 0x9000 not in mb.map
+    mb.map[0x9000] = {'reg': Register.TEST_REG1,   'fmt': '!H', 'ratio':  1}
+
+    mb.build_msg(1,3,0x9000,2)
+
+    # 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'):
+        call += 1
+    assert mb.err == 0
+    assert 0 == call
+    assert not mb.req_pend
+
+    del mb.map[0x9000]
--- a/app/tests/test_solarman.py
+++ b/app/tests/test_solarman.py
@@ -1,10 +1,15 @@
 import pytest
 import struct
 import time
+import logging
 from datetime import datetime
 from app.src.gen3plus.solarman_v5 import SolarmanV5
 from app.src.config import Config
 from app.src.infos import Infos, Register
+from app.src.modbus import Modbus
+
+
+pytest_plugins = ('pytest_asyncio',)

 # initialize the proxy statistics
 Infos.static_init()
@@ -12,9 +17,19 @@ 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 MemoryStream(SolarmanV5):
    def __init__(self, msg, chunks = (0,), server_side: bool = True):
        super().__init__(server_side)
+        if server_side:
+            self.mb.timeout = 1   # overwrite for faster testing
+        self.writer = Writer()
        self.__msg = msg
        self.__msg_len = len(msg)
        self.__chunks = chunks
@@ -24,13 +39,16 @@ class MemoryStream(SolarmanV5):
        self.addr = 'Test: SrvSide'
        self.db.stat['proxy']['Invalid_Msg_Format'] = 0
        self.db.stat['proxy']['AT_Command'] = 0
+        self.db.stat['proxy']['AT_Command_Blocked'] = 0
+        self.test_exception_async_write = False
+        self.entity_prfx = ''
+        self.at_acl = {'mqtt': {'allow': ['AT+'], 'block': ['AT+WEBU']}, 'tsun': {'allow': ['AT+Z', 'AT+UPURL', 'AT+SUPDATE', 'AT+TIME'], 'block': ['AT+WEBU']}}

    def _timestamp(self):
        return timestamp
    
    def _heartbeat(self) -> int:
        return heartbeat
-    

    def append_msg(self, msg):
        self.__msg += msg
@@ -54,6 +72,16 @@ class MemoryStream(SolarmanV5):
            pass     
        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.remoteStream = c
+        c. remoteStream = self
+        return c
+
    def _SolarmanV5__flush_recv_msg(self) -> None:
        super()._SolarmanV5__flush_recv_msg()
        self.msg_count += 1
@@ -63,6 +91,9 @@ class MemoryStream(SolarmanV5):
 def get_sn() -> bytes:
    return b'\x21\x43\x65\x7b'

+def get_sn_int() -> int:
+    return 2070233889
+
 def get_inv_no() -> bytes:
    return b'T170000000000001'

@@ -308,6 +339,72 @@ def InverterIndMsg2000():  # 0x4210 rated Power 2000W
    msg += b'\x15'
    return msg

+@pytest.fixture
+def InverterIndMsg800():  # 0x4210 rated Power 800W 
+    msg  = b'\xa5\x99\x01\x10\x42\xe6\x9e' +get_sn()  +b'\x01\xb0\x02\xbc\xc8'
+    msg += b'\x24\x32\x6c\x1f\x00\x00\xa0\x47\xe4\x33\x01\x00\x03\x08\x00\x00'
+    msg += b'\x59\x31\x37\x45\x37\x41\x30\x46\x30\x31\x30\x42\x30\x31\x33\x45'
+    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\x36\x00\x00\x03\x20\x06\x7a'
+    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\x03\x20\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'
+    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'\x04\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 InverterIndMsg_81():  # 0x4210 fcode 0x81
+    msg  = b'\xa5\x99\x01\x10\x42\x02\x03' +get_sn()  +b'\x81\xb0\x02\xbc\xc8'
+    msg += b'\x24\x32\x6c\x1f\x00\x00\xa0\x07\x04\x03\x01\x00\x03\x08\x00\x00'
+    msg += b'\x59\x31\x37\x45\x37\x41\x30\x46\x30\x31\x30\x42\x30\x31\x33\x45'
+    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\x36\x00\x00\x02\x58\x06\x7a'
+    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'
+    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'\x04\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 InverterRspMsg():  # 0x1210
    msg  = b'\xa5\x0a\x00\x10\x12\x02\02' +get_sn()  +b'\x01\x01'
@@ -317,6 +414,15 @@ def InverterRspMsg():  # 0x1210
    msg += b'\x15'
    return msg

+@pytest.fixture
+def InverterRspMsg_81():  # 0x1210 fcode 0x81
+    msg  = b'\xa5\x0a\x00\x10\x12\x03\03' +get_sn()  +b'\x81\x01'
+    msg += total()  
+    msg += hb()
+    msg += correct_checksum(msg)
+    msg += b'\x15'
+    return msg
+
@pytest.fixture
 def UnknownMsg():  # 0x5110
    msg  = b'\xa5\x0a\x00\x10\x51\x10\x84' +get_sn()  +b'\x01\x01\x69\x6f\x09'
@@ -346,7 +452,7 @@ def SyncStartRspMsg():  # 0x1310

@pytest.fixture
 def SyncStartFwdMsg():  # 0x4310
-    msg  = b'\xa5\x2f\x00\x10\x43\x0e\x0d' +get_sn()  +b'\x81\x7a\x0b\x2e\x32'
+    msg  = b'\xa5\x2f\x00\x10\x43\x0d\x0e' +get_sn()  +b'\x81\x7a\x0b\x2e\x32'
    msg += b'\x39\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x41\x6c\x6c\x69\x75\x73'
    msg += b'\x2d\x48\x6f\x6d\x65\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x61\x01'
@@ -357,16 +463,25 @@ def SyncStartFwdMsg():  # 0x4310

@pytest.fixture
 def AtCommandIndMsg():  # 0x4510
-    msg  = b'\xa5\x27\x00\x10\x45\x02\x01' +get_sn() +b'\x01\x02\x00'
+    msg  = b'\xa5\x27\x00\x10\x45\x03\x02' +get_sn() +b'\x01\x02\x00'
    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'           
    msg += b'AT+TIME=214028,1,60,120\r'
    msg += correct_checksum(msg)
    msg += b'\x15'
    return msg

+@pytest.fixture
+def AtCommandIndMsgBlock():  # 0x4510
+    msg  = b'\xa5\x17\x00\x10\x45\x03\x02' +get_sn() +b'\x01\x02\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'           
+    msg += b'AT+WEBU\r'
+    msg += correct_checksum(msg)
+    msg += b'\x15'
+    return msg
+
@pytest.fixture
 def AtCommandRspMsg():  # 0x1510
-    msg  = b'\xa5\x0a\x00\x10\x15\x02\x02' +get_sn()  +b'\x01\x01'
+    msg  = b'\xa5\x0a\x00\x10\x15\x03\x03' +get_sn()  +b'\x01\x01'
    msg += total()  
    msg += hb()
    msg += correct_checksum(msg)
@@ -410,6 +525,81 @@ def SyncEndRspMsg():  # 0x1810
    msg += b'\x15'
    return msg

+@pytest.fixture
+def MsgModbusCmd():
+    msg  = b'\xa5\x17\x00\x10\x45\x03\x02' +get_sn()  +b'\x02\xb0\x02'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x06\x20\x08'
+    msg += b'\x00\x00\x03\xc8'
+    msg += correct_checksum(msg)
+    msg += b'\x15'
+    return msg
+
+@pytest.fixture
+def MsgModbusCmdFwd():
+    msg  = b'\xa5\x17\x00\x10\x45\x01\x00' +get_sn()  +b'\x02\xb0\x02'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x06\x20\x08'
+    msg += b'\x00\x00\x03\xc8'
+    msg += correct_checksum(msg)
+    msg += b'\x15'
+    return msg
+
+@pytest.fixture
+def MsgModbusCmdCrcErr():
+    msg  = b'\xa5\x17\x00\x10\x45\x03\x02' +get_sn()  +b'\x02\xb0\x02'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x06\x20\x08'
+    msg += b'\x00\x00\x04\xc8'
+    msg += correct_checksum(msg)
+    msg += b'\x15'
+    return msg
+
+@pytest.fixture
+def MsgModbusRsp():  # 0x1510
+    msg  = b'\xa5\x3b\x00\x10\x15\x03\x03' +get_sn()  +b'\x02\x01'
+    msg += total()  
+    msg += hb()
+    msg += b'\x0a\xe2\xfa\x33\x01\x03\x28\x40\x10\x08\xd8'
+    msg += b'\x00\x00\x13\x87\x00\x31\x00\x68\x02\x58\x00\x00\x01\x53\x00\x02'
+    msg += b'\x00\x00\x01\x52\x00\x02\x00\x00\x01\x53\x00\x03\x00\x00\x00\x04'
+    msg += b'\x00\x01\x00\x00\x6c\x68'
+    msg += correct_checksum(msg)
+    msg += b'\x15'
+    return msg
+
+@pytest.fixture
+def MsgModbusInvalid():  # 0x1510
+    msg  = b'\xa5\x3b\x00\x10\x15\x03\x03' +get_sn()  +b'\x02\x00'
+    msg += total()  
+    msg += hb()
+    msg += b'\x0a\xe2\xfa\x33\x01\x03\x28\x40\x10\x08\xd8'
+    msg += b'\x00\x00\x13\x87\x00\x31\x00\x68\x02\x58\x00\x00\x01\x53\x00\x02'
+    msg += b'\x00\x00\x01\x52\x00\x02\x00\x00\x01\x53\x00\x03\x00\x00\x00\x04'
+    msg += b'\x00\x01\x00\x00\x6c\x68'
+    msg += correct_checksum(msg)
+    msg += b'\x15'
+    return msg
+
+@pytest.fixture
+def MsgUnknownCmd():
+    msg  = b'\xa5\x17\x00\x10\x45\x03\x02' +get_sn()  +b'\x03\xb0\x02'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x06\x20\x08'
+    msg += b'\x00\x00\x03\xc8'
+    msg += correct_checksum(msg)
+    msg += b'\x15'
+    return msg
+
+@pytest.fixture
+def MsgUnknownCmdRsp():  # 0x1510
+    msg  = b'\xa5\x3b\x00\x10\x15\x03\x03' +get_sn()  +b'\x03\x01'
+    msg += total()  
+    msg += hb()
+    msg += b'\x0a\xe2\xfa\x33\x01\x03\x28\x40\x10\x08\xd8'
+    msg += b'\x00\x00\x13\x87\x00\x31\x00\x68\x02\x58\x00\x00\x01\x53\x00\x02'
+    msg += b'\x00\x00\x01\x52\x00\x02\x00\x00\x01\x53\x00\x03\x00\x00\x00\x04'
+    msg += b'\x00\x01\x00\x00\x6c\x68'
+    msg += correct_checksum(msg)
+    msg += b'\x15'
+    return msg
+
@pytest.fixture
 def ConfigTsunAllowAll():
    Config.config = {'solarman':{'enabled': True}, 'inverters':{'allow_all':True}}
@@ -693,6 +883,52 @@ def test_read_two_messages(ConfigTsunAllowAll, DeviceIndMsg, DeviceRspMsg, Inver
    assert m._send_buffer==b''
    m.close()

+def test_read_two_messages2(ConfigTsunAllowAll, InverterIndMsg, InverterIndMsg_81, InverterRspMsg, InverterRspMsg_81):
+    ConfigTsunAllowAll
+    m = MemoryStream(InverterIndMsg, (0,))
+    m.append_msg(InverterIndMsg_81)
+    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.header_len==11
+    assert m.snr == 2070233889
+    assert m.unique_id == '2070233889'
+    assert m.control == 0x4210
+    assert m.time_ofs == 0x33e447a0
+    assert str(m.seq) == '02:02'
+    assert m.data_len == 0x199
+    assert m.msg_count == 1
+    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
+    assert m._forward_buffer==InverterIndMsg
+    assert m._send_buffer==InverterRspMsg
+ 
+    m._send_buffer = bytearray(0) # clear send buffer for next test  
+    m._init_new_client_conn()
+    assert m._send_buffer==b''
+    assert m._recv_buffer==InverterIndMsg_81
+    
+    m._send_buffer = bytearray(0) # clear send buffer for next test
+    m._forward_buffer = bytearray(0) # clear forward buffer for next test
+    m.read()         # read complete msg, and dispatch msg
+    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
+    assert not m.header_valid  # must be invalid, since msg was handled and buffer flushed
+    assert m.msg_count == 2
+    assert m.header_len==11
+    assert m.snr == 2070233889
+    assert m.unique_id == '2070233889'
+    assert m.control == 0x4210
+    assert m.time_ofs == 0x33e447a0
+    assert str(m.seq) == '03:03'
+    assert m.data_len == 0x199
+    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
+    assert m._forward_buffer==InverterIndMsg_81
+    assert m._send_buffer==InverterRspMsg_81
+
+    m._send_buffer = bytearray(0) # clear send buffer for next test    
+    m._init_new_client_conn()
+    assert m._send_buffer==b''
+    m.close()
+
 def test_unkown_message(ConfigTsunInv1, UnknownMsg):
    ConfigTsunInv1
    m = MemoryStream(UnknownMsg, (0,))
@@ -725,7 +961,7 @@ def test_device_rsp(ConfigTsunInv1, DeviceRspMsg):
    assert m.data_len == 0x0a
    assert m._recv_buffer==b''
    assert m._send_buffer==b''
-    assert m._forward_buffer==b''  # DeviceRspMsg
+    assert m._forward_buffer==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -743,7 +979,7 @@ def test_inverter_rsp(ConfigTsunInv1, InverterRspMsg):
    assert m.data_len == 0x0a
    assert m._recv_buffer==b''
    assert m._send_buffer==b''
-    assert m._forward_buffer==b''  # InverterRspMsg
+    assert m._forward_buffer==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -779,7 +1015,7 @@ def test_heartbeat_rsp(ConfigTsunInv1, HeartbeatRspMsg):
    assert m.data_len == 0x0a
    assert m._recv_buffer==b''
    assert m._send_buffer==b''
-    assert m._forward_buffer==b''  # HeartbeatRspMsg
+    assert m._forward_buffer==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -800,6 +1036,7 @@ def test_sync_start_ind(ConfigTsunInv1, SyncStartIndMsg, SyncStartRspMsg, SyncSt
    assert m._forward_buffer==SyncStartIndMsg
    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)
    assert str(m.seq) == '0d:0e'  # value after forwarding indication
    assert m._forward_buffer==SyncStartFwdMsg
@@ -820,7 +1057,7 @@ def test_sync_start_rsp(ConfigTsunInv1, SyncStartRspMsg):
    assert m.data_len == 0x0a
    assert m._recv_buffer==b''
    assert m._send_buffer==b''
-    assert m._forward_buffer==b''  # HeartbeatRspMsg
+    assert m._forward_buffer==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

@@ -856,29 +1093,10 @@ def test_sync_end_rsp(ConfigTsunInv1, SyncEndRspMsg):
    assert m.data_len == 0x0a
    assert m._recv_buffer==b''
    assert m._send_buffer==b''
-    assert m._forward_buffer==b''  # HeartbeatRspMsg
+    assert m._forward_buffer==b''
    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
    m.close()

-def test_at_command_ind(ConfigTsunInv1, AtCommandIndMsg, AtCommandRspMsg):
-    ConfigTsunInv1
-    m = MemoryStream(AtCommandIndMsg, (0,), False)
-    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.header_len==11
-    assert m.snr == 2070233889
-    # assert m.unique_id == '2070233889'
-    assert m.control == 0x4510
-    assert str(m.seq) == '02:02'
-    assert m.data_len == 39
-    assert m._recv_buffer==b''
-    assert m._send_buffer==AtCommandRspMsg
-    assert m._forward_buffer==AtCommandIndMsg
-    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
-    assert m.db.stat['proxy']['AT_Command'] == 1
-    m.close()
-
 def test_build_modell_600(ConfigTsunAllowAll, InverterIndMsg):
    ConfigTsunAllowAll
    m = MemoryStream(InverterIndMsg, (0,))
@@ -931,6 +1149,18 @@ def test_build_modell_2000(ConfigTsunAllowAll, InverterIndMsg2000):
    assert 'TSOL-MS2000' == m.db.get_db_value(Register.EQUIPMENT_MODEL, 0)
    m.close()

+def test_build_modell_800(ConfigTsunAllowAll, InverterIndMsg800):
+    ConfigTsunAllowAll
+    m = MemoryStream(InverterIndMsg800, (0,))
+    assert 0 == m.db.get_db_value(Register.MAX_DESIGNED_POWER, 0)
+    assert None == m.db.get_db_value(Register.RATED_POWER, None)
+    assert None == m.db.get_db_value(Register.INVERTER_TEMP, None)
+    m.read()         # read complete msg, and dispatch msg
+    assert 800 == m.db.get_db_value(Register.MAX_DESIGNED_POWER, 0)
+    assert 800 == m.db.get_db_value(Register.RATED_POWER, 0)
+    assert 'TSOL-MSxx00' == m.db.get_db_value(Register.EQUIPMENT_MODEL, 0)
+    m.close()
+
 def test_build_logger_modell(ConfigTsunAllowAll, DeviceIndMsg):
    ConfigTsunAllowAll
    m = MemoryStream(DeviceIndMsg, (0,))
@@ -942,21 +1172,511 @@ def test_build_logger_modell(ConfigTsunAllowAll, DeviceIndMsg):
    assert 'V1.1.00.0B' == m.db.get_db_value(Register.COLLECTOR_FW_VERSION, 0).rstrip('\00')
    m.close()

-def test_AT_cmd(ConfigTsunAllowAll, DeviceIndMsg, DeviceRspMsg, AtCommandIndMsg):
-    ConfigTsunAllowAll
+def test_msg_iterator():
+    m1 = SolarmanV5(server_side=True)
+    m2 = SolarmanV5(server_side=True)
+    m3 = SolarmanV5(server_side=True)
+    m3.close()
+    del m3
+    test1 = 0
+    test2 = 0
+    for key in SolarmanV5:
+        if key == m1:
+            test1+=1
+        elif key == m2:
+            test2+=1
+        elif type(key) != SolarmanV5:
+            continue
+        else:
+            assert False
+    assert test1 == 1
+    assert test2 == 1
+
+def test_proxy_counter():
+    m = SolarmanV5(server_side=True)
+    assert m.new_data == {}
+    m.db.stat['proxy']['Unknown_Msg'] = 0
+    Infos.new_stat_data['proxy'] =  False
+
+    m.inc_counter('Unknown_Msg')
+    assert m.new_data == {}
+    assert Infos.new_stat_data == {'proxy': True}
+    assert 1 == m.db.stat['proxy']['Unknown_Msg']
+
+    Infos.new_stat_data['proxy'] =  False
+    m.dec_counter('Unknown_Msg')
+    assert m.new_data == {}
+    assert Infos.new_stat_data == {'proxy': True}
+    assert 0 == m.db.stat['proxy']['Unknown_Msg']
+    m.close()
+
+@pytest.mark.asyncio
+async def test_msg_build_modbus_req(ConfigTsunInv1, DeviceIndMsg, DeviceRspMsg, InverterIndMsg, InverterRspMsg, MsgModbusCmd):
+    ConfigTsunInv1
    m = MemoryStream(DeviceIndMsg, (0,), True)
+    m.append_msg(InverterIndMsg)
    m.read()
    assert m.control == 0x4110
    assert str(m.seq) == '01:01'
-    assert m._recv_buffer==b''
+    assert m._recv_buffer==InverterIndMsg   # unhandled next message
    assert m._send_buffer==DeviceRspMsg
    assert m._forward_buffer==DeviceIndMsg
+
+    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 m._recv_buffer==InverterIndMsg   # unhandled next message
+    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
+
+    m.read()
+    assert m.control == 0x4210
+    assert str(m.seq) == '02:02'
+    assert m._recv_buffer==b''
+    assert m._send_buffer==InverterRspMsg
+    assert m._forward_buffer==InverterIndMsg
+
+    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 == MsgModbusCmd
+    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''
+    m.close()
+
+@pytest.mark.asyncio
+async def test_AT_cmd(ConfigTsunAllowAll, DeviceIndMsg, DeviceRspMsg, InverterIndMsg, InverterRspMsg, AtCommandIndMsg):
+    ConfigTsunAllowAll
+    m = MemoryStream(DeviceIndMsg, (0,), True)
+    m.append_msg(InverterIndMsg)
+    m.read()
+    assert m.control == 0x4110
+    assert str(m.seq) == '01:01'
+    assert m._recv_buffer==InverterIndMsg   # unhandled next message
+    assert m._send_buffer==DeviceRspMsg
+    assert m._forward_buffer==DeviceIndMsg
+
+    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._recv_buffer==InverterIndMsg   # unhandled next message
+    assert m._send_buffer==b''
+    assert m._forward_buffer==b''
+    assert str(m.seq) == '01:01'
+
+    m.read()
+    assert m.control == 0x4210
+    assert str(m.seq) == '02:02'
+    assert m._recv_buffer==b''
+    assert m._send_buffer==InverterRspMsg
+    assert m._forward_buffer==InverterIndMsg
    
    m._send_buffer = bytearray(0) # clear send buffer for next test    
    m._forward_buffer = bytearray(0) # clear send buffer for next test    
-    m.send_at_cmd('AT+TIME=214028,1,60,120')
+    await m.send_at_cmd('AT+TIME=214028,1,60,120')
    assert m._recv_buffer==b''
    assert m._send_buffer==AtCommandIndMsg
    assert m._forward_buffer==b''
-    assert str(m.seq) == '01:02'
+    assert str(m.seq) == '02:03'
+
+    m._send_buffer = bytearray(0) # clear send buffer for next test    
+    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 str(m.seq) == '02:04'
+    assert m.forward_at_cmd_resp == False
    m.close()
+
+@pytest.mark.asyncio
+async def test_AT_cmd_blocked(ConfigTsunAllowAll, DeviceIndMsg, DeviceRspMsg, InverterIndMsg, InverterRspMsg, AtCommandIndMsg):
+    ConfigTsunAllowAll
+    m = MemoryStream(DeviceIndMsg, (0,), True)
+    m.append_msg(InverterIndMsg)
+    m.read()
+    assert m.control == 0x4110
+    assert str(m.seq) == '01:01'
+    assert m._recv_buffer==InverterIndMsg   # unhandled next message
+    assert m._send_buffer==DeviceRspMsg
+    assert m._forward_buffer==DeviceIndMsg
+
+    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==InverterIndMsg   # unhandled next message
+    assert m._send_buffer==b''
+    assert m._forward_buffer==b''
+    assert str(m.seq) == '01:01'
+
+    m.read()
+    assert m.control == 0x4210
+    assert str(m.seq) == '02:02'
+    assert m._recv_buffer==b''
+    assert m._send_buffer==InverterRspMsg
+    assert m._forward_buffer==InverterIndMsg
+    
+    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 str(m.seq) == '02:02'
+    assert m.forward_at_cmd_resp == False
+    m.close()
+
+def test_AT_cmd_ind(ConfigTsunInv1, AtCommandIndMsg):
+    ConfigTsunInv1
+    m = MemoryStream(AtCommandIndMsg, (0,), False)
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['AT_Command'] = 0
+    m.db.stat['proxy']['AT_Command_Blocked'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 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.header_len==11
+    assert m.snr == 2070233889
+    # assert m.unique_id == '2070233889'
+    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==AtCommandIndMsg
+    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
+    assert m.db.stat['proxy']['Modbus_Command'] == 0
+    m.close()
+
+def test_AT_cmd_ind_block(ConfigTsunInv1, AtCommandIndMsgBlock):
+    ConfigTsunInv1
+    m = MemoryStream(AtCommandIndMsgBlock, (0,), False)
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['AT_Command'] = 0
+    m.db.stat['proxy']['AT_Command_Blocked'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 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.header_len==11
+    assert m.snr == 2070233889
+    # assert m.unique_id == '2070233889'
+    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.db.stat['proxy']['Invalid_Msg_Format'] == 0
+    assert m.db.stat['proxy']['AT_Command'] == 0
+    assert m.db.stat['proxy']['AT_Command_Blocked'] == 1
+    assert m.db.stat['proxy']['Modbus_Command'] == 0
+    m.close()
+
+def test_msg_at_command_rsp1(ConfigTsunInv1, AtCommandRspMsg):
+    ConfigTsunInv1
+    m = MemoryStream(AtCommandRspMsg)
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 0
+    m.forward_at_cmd_resp = True
+    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.control == 0x1510
+    assert str(m.seq) == '03:03'
+    assert m.header_len==11
+    assert m.data_len==10
+    assert m._forward_buffer==AtCommandRspMsg
+    assert m._send_buffer==b''
+    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
+    assert m.db.stat['proxy']['Modbus_Command'] == 0
+    m.close()
+
+def test_msg_at_command_rsp2(ConfigTsunInv1, AtCommandRspMsg):
+    ConfigTsunInv1
+    m = MemoryStream(AtCommandRspMsg)
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 0
+    m.forward_at_cmd_resp = False
+    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.control == 0x1510
+    assert str(m.seq) == '03:03'
+    assert m.header_len==11
+    assert m.data_len==10
+    assert m._forward_buffer==b''
+    assert m._send_buffer==b''
+    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
+    assert m.db.stat['proxy']['Modbus_Command'] == 0
+    m.close()
+
+def test_msg_modbus_req(ConfigTsunInv1, MsgModbusCmd, MsgModbusCmdFwd):
+    ConfigTsunInv1
+    m = MemoryStream(b'')
+    m.snr = get_sn_int()
+    m.state = m.STATE_UP
+    c = m.createClientStream(MsgModbusCmd)
+
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['AT_Command'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 0
+    m.db.stat['proxy']['Invalid_Msg_Format'] = 0
+    c.read()         # read complete msg, and dispatch msg
+    assert not c.header_valid  # must be invalid, since msg was handled and buffer flushed
+    assert c.msg_count == 1
+    assert c.control == 0x4510
+    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 == MsgModbusCmdFwd
+    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
+    assert m.db.stat['proxy']['AT_Command'] == 0
+    assert m.db.stat['proxy']['Modbus_Command'] == 1
+    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
+    m.close()
+
+def test_msg_modbus_req2(ConfigTsunInv1, MsgModbusCmdCrcErr):
+    ConfigTsunInv1
+    m = MemoryStream(b'')
+    m.snr = get_sn_int()
+    m.state = m.STATE_UP
+    c = m.createClientStream(MsgModbusCmdCrcErr)
+
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['AT_Command'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 0
+    m.db.stat['proxy']['Invalid_Msg_Format'] = 0
+    c.read()         # read complete msg, and dispatch msg
+    assert not c.header_valid  # must be invalid, since msg was handled and buffer flushed
+    assert c.msg_count == 1
+    assert c.control == 0x4510
+    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 m.db.stat['proxy']['Unknown_Ctrl'] == 0
+    assert m.db.stat['proxy']['AT_Command'] == 0
+    assert m.db.stat['proxy']['Modbus_Command'] == 0
+    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 1
+    m.close()
+
+def test_msg_unknown_cmd_req(ConfigTsunInv1, MsgUnknownCmd):
+    ConfigTsunInv1
+    m = MemoryStream(MsgUnknownCmd, (0,), False)
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['AT_Command'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 0
+    m.db.stat['proxy']['Invalid_Msg_Format'] = 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.control == 0x4510
+    assert str(m.seq) == '03:02'
+    assert m.header_len==11
+    assert m.data_len==23
+    assert m._forward_buffer==MsgUnknownCmd
+    assert m._send_buffer==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
+    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 0
+    m.close()
+
+def test_msg_modbus_rsp1(ConfigTsunInv1, MsgModbusRsp):
+    '''Modbus response without a valid Modbus request must be dropped'''
+    ConfigTsunInv1
+    m = MemoryStream(MsgModbusRsp)
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 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.control == 0x1510
+    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.db.stat['proxy']['Unknown_Ctrl'] == 0
+    assert m.db.stat['proxy']['Modbus_Command'] == 0
+    m.close()
+
+def test_msg_modbus_rsp2(ConfigTsunInv1, MsgModbusRsp):
+    '''Modbus response with a valid Modbus request must be forwarded'''
+    ConfigTsunInv1
+    m = MemoryStream(MsgModbusRsp)
+    m.append_msg(MsgModbusRsp)
+
+    m.mb.rsp_handler = m._SolarmanV5__forward_msg
+    m.mb.last_addr = 1
+    m.mb.last_fcode = 3
+    m.mb.last_len = 20
+    m.mb.last_reg = 0x3008
+    m.mb.req_pend = True
+    m.mb.err = 0
+    # assert m.db.db == {'inverter': {'Manufacturer': 'TSUN', 'Equipment_Model': 'TSOL-MSxx00'}}
+    m.new_data['inverter'] = False
+
+    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 == 1
+    assert m._forward_buffer==MsgModbusRsp
+    assert m._send_buffer==b''
+    # assert m.db.db == {'inverter': {'Version': 'V5.1.09', 'Rated_Power': 300}, 'grid': {'Voltage': 225.9, 'Current': 0.41, 'Frequency': 49.99, 'Output_Power': 94.8}, 'env': {'Inverter_Temp': 22}, 'input': {'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) == 'V4.0.10'
+    assert m.new_data['inverter'] == True
+    m.new_data['inverter'] = False
+
+    m.mb.req_pend = True
+    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==MsgModbusRsp
+    assert m._send_buffer==b''
+    # assert m.db.db == {'inverter': {'Version': 'V5.1.09', 'Rated_Power': 300}, 'grid': {'Voltage': 225.9, 'Current': 0.41, 'Frequency': 49.99, 'Output_Power': 94.8}, 'env': {'Inverter_Temp': 22}, 'input': {'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) == 'V4.0.10'
+    assert m.new_data['inverter'] == False
+
+    m.close()
+
+def test_msg_modbus_rsp3(ConfigTsunInv1, MsgModbusRsp):
+    '''Modbus response with a valid Modbus request must be forwarded'''
+    ConfigTsunInv1
+    m = MemoryStream(MsgModbusRsp)
+    m.append_msg(MsgModbusRsp)
+
+    m.mb.rsp_handler = m._SolarmanV5__forward_msg
+    m.mb.last_addr = 1
+    m.mb.last_fcode = 3
+    m.mb.last_len = 20
+    m.mb.last_reg = 0x3008
+    m.mb.req_pend = True
+    m.mb.err = 0
+    # assert m.db.db == {'inverter': {'Manufacturer': 'TSUN', 'Equipment_Model': 'TSOL-MSxx00'}}
+    m.new_data['inverter'] = False
+
+    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 == 1
+    assert m._forward_buffer==MsgModbusRsp
+    assert m._send_buffer==b''
+    # assert m.db.db == {'inverter': {'Version': 'V5.1.09', 'Rated_Power': 300}, 'grid': {'Voltage': 225.9, 'Current': 0.41, 'Frequency': 49.99, 'Output_Power': 94.8}, 'env': {'Inverter_Temp': 22}, 'input': {'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) == 'V4.0.10'
+    assert m.new_data['inverter'] == True
+    m.new_data['inverter'] = False
+
+    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==MsgModbusRsp
+    assert m._send_buffer==b''
+    # assert m.db.db == {'inverter': {'Version': 'V5.1.09', 'Rated_Power': 300}, 'grid': {'Voltage': 225.9, 'Current': 0.41, 'Frequency': 49.99, 'Output_Power': 94.8}, 'env': {'Inverter_Temp': 22}, 'input': {'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) == 'V4.0.10'
+    assert m.new_data['inverter'] == False
+
+    m.close()
+
+def test_msg_unknown_rsp(ConfigTsunInv1, MsgUnknownCmdRsp):
+    ConfigTsunInv1
+    m = MemoryStream(MsgUnknownCmdRsp)
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 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.control == 0x1510
+    assert str(m.seq) == '03:03'
+    assert m.header_len==11
+    assert m.data_len==59
+    assert m._forward_buffer==MsgUnknownCmdRsp
+    assert m._send_buffer==b''
+    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
+    assert m.db.stat['proxy']['Modbus_Command'] == 0
+    m.close()
+
+def test_msg_modbus_invalid(ConfigTsunInv1, MsgModbusInvalid):
+    ConfigTsunInv1
+    m = MemoryStream(MsgModbusInvalid, (0,), False)
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 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._forward_buffer==b''
+    assert m._send_buffer==b''
+    assert m.db.stat['proxy']['Unknown_Ctrl'] == 0
+    assert m.db.stat['proxy']['Modbus_Command'] == 0
+    m.close()
+
+def test_msg_modbus_fragment(ConfigTsunInv1, MsgModbusRsp):
+    ConfigTsunInv1
+    # receive more bytes than expected (7 bytes from the next msg)
+    m = MemoryStream(MsgModbusRsp+b'\x00\x00\x00\x45\x10\x52\x31', (0,))
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 0
+    m.mb.rsp_handler = m._SolarmanV5__forward_msg
+    m.mb.last_addr = 1
+    m.mb.last_fcode = 3
+    m.mb.last_len = 20
+    m.mb.last_reg = 0x3008
+    m.mb.req_pend = True
+    m.mb.err = 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._forward_buffer==MsgModbusRsp
+    assert m._send_buffer == 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
+    assert m.db.stat['proxy']['Modbus_Command'] == 0
+    m.close()
+'''
+def test_zombie_conn(ConfigTsunInv1, MsgInverterInd):
+    ConfigTsunInv1
+    tracer.setLevel(logging.DEBUG)
+    m1 = MemoryStream(MsgInverterInd, (0,))
+    m2 = MemoryStream(MsgInverterInd, (0,))
+    m3 = MemoryStream(MsgInverterInd, (0,))
+    assert m1.state == m1.STATE_INIT
+    assert m2.state == m2.STATE_INIT
+    assert m3.state == m3.STATE_INIT
+    m1.read()         # read complete msg, and set unique_id
+    assert m1.state == m1.STATE_INIT
+    assert m2.state == m2.STATE_INIT
+    assert m3.state == m3.STATE_INIT
+    m2.read()         # read complete msg, and set unique_id
+    assert m1.state == m1.STATE_CLOSED
+    assert m2.state == m2.STATE_INIT
+    assert m3.state == m3.STATE_INIT
+    m3.read()         # read complete msg, and set unique_id
+    assert m1.state == m1.STATE_CLOSED
+    assert m2.state == m2.STATE_CLOSED
+    assert m3.state == m3.STATE_INIT
+    m1.close()
+    m2.close()
+    m3.close()
+'''
--- a/app/tests/test_talent.py
+++ b/app/tests/test_talent.py
@@ -2,16 +2,31 @@
 import pytest, logging
 from app.src.gen3.talent import Talent, Control
 from app.src.config import Config
-from app.src.infos import Infos
+from app.src.infos import Infos, Register
+from app.src.modbus import Modbus
+
+ 
+pytest_plugins = ('pytest_asyncio',)

 # initialize the proxy statistics
 Infos.static_init()

 tracer = logging.getLogger('tracer')
-    
+
+
+class Writer():
+    def __init__(self):
+        self.sent_pdu = b''
+
+    def write(self, pdu: bytearray):
+        self.sent_pdu = pdu
+
 class MemoryStream(Talent):
    def __init__(self, msg, chunks = (0,), server_side: bool = True):
        super().__init__(server_side)
+        if server_side:
+            self.mb.timeout = 1   # overwrite for faster testing
+        self.writer = Writer()
        self.__msg = msg
        self.__msg_len = len(msg)
        self.__chunks = chunks
@@ -19,6 +34,8 @@ class MemoryStream(Talent):
        self.__chunk_idx = 0
        self.msg_count = 0
        self.addr = 'Test: SrvSide'
+        self.send_msg_ofs = 0
+        self.test_exception_async_write = False

    def append_msg(self, msg):
        self.__msg += msg
@@ -45,11 +62,22 @@ class MemoryStream(Talent):
    def _timestamp(self):
        return 1700260990000
    
+    def createClientStream(self, msg, chunks = (0,)):
+        c = MemoryStream(msg, chunks, False)
+        self.remoteStream = c
+        c. remoteStream = self
+        return c
+
    def _Talent__flush_recv_msg(self) -> None:
        super()._Talent__flush_recv_msg()
        self.msg_count += 1
        return
    
+    async def async_write(self, headline=''):
+        if self.test_exception_async_write:
+            raise RuntimeError("Peer closed.")
+
+    

@pytest.fixture
 def MsgContactInfo(): # Contact Info message
@@ -170,6 +198,42 @@ def MsgOtaAck(): # Over the air update rewuest from tsun cloud
 def MsgOtaInvalid(): # Get Time Request message
    return b'\x00\x00\x00\x14\x10R170000000000001\x99\x13\x01'

+@pytest.fixture
+def MsgModbusCmd():
+    msg  = b'\x00\x00\x00\x20\x10R170000000000001'
+    msg += b'\x70\x77\x00\x01\xa3\x28\x08\x01\x06\x20\x08'
+    msg += b'\x00\x00\x03\xc8'
+    return msg
+
+@pytest.fixture
+def MsgModbusCmdCrcErr():
+    msg  = b'\x00\x00\x00\x20\x10R170000000000001'
+    msg += b'\x70\x77\x00\x01\xa3\x28\x08\x01\x06\x20\x08'
+    msg += b'\x00\x00\x04\xc8'
+    return msg
+
+@pytest.fixture
+def MsgModbusRsp():
+    msg  = b'\x00\x00\x00\x20\x10R170000000000001'
+    msg += b'\x91\x77\x17\x18\x19\x1a\x08\x01\x06\x20\x08'
+    msg += b'\x00\x00\x03\xc8'
+    return msg
+
+@pytest.fixture
+def MsgModbusInv():
+    msg  = b'\x00\x00\x00\x20\x10R170000000000001'
+    msg += b'\x99\x77\x17\x18\x19\x1a\x08\x01\x06\x20\x08'
+    msg += b'\x00\x00\x03\xc8'
+    return msg
+
+@pytest.fixture
+def MsgModbusResp20():
+    msg  = b'\x00\x00\x00\x45\x10R170000000000001'
+    msg += b'\x91\x77\x17\x18\x19\x1a\x2d\x01\x03\x28\x51'
+    msg += b'\x09\x08\xd3\x00\x29\x13\x87\x00\x3e\x00\x00\x01\x2c\x03\xb4\x00'
+    msg += b'\x08\x00\x00\x00\x00\x01\x59\x01\x21\x03\xe6\x00\x00\x00\x00\x00'
+    msg += b'\x00\x00\x00\x00\x00\x00\x00\xdb\x6b'
+    return msg

 def test_read_message(MsgContactInfo):
    m = MemoryStream(MsgContactInfo, (0,))
@@ -695,10 +759,16 @@ def test_msg_unknown(ConfigTsunInv1, MsgUnknown):
    m.close()

 def test_ctrl_byte():
+    c = Control(0x70)
+    assert not c.is_ind()
+    assert not c.is_resp()    
+    assert c.is_req()
    c = Control(0x91)
+    assert not c.is_req()
    assert c.is_ind()
    assert not c.is_resp()    
    c = Control(0x99)
+    assert not c.is_req()
    assert not c.is_ind()
    assert c.is_resp()    

@@ -724,19 +794,355 @@ def test_msg_iterator():
    assert test2 == 1

 def test_proxy_counter():
-    m = Talent(server_side=True)
+    # m = MemoryStream(b'')
+    # m.close()
+    Infos.stat['proxy']['Modbus_Command'] = 1
+ 
+    m = MemoryStream(b'')
+    m.id_str = b"R170000000000001" 
+    c = m.createClientStream(b'')
+
    assert m.new_data == {}
    m.db.stat['proxy']['Unknown_Msg'] = 0
+    c.db.stat['proxy']['Unknown_Msg'] = 0
    Infos.new_stat_data['proxy'] =  False

    m.inc_counter('Unknown_Msg')
+    m.close()
+    m = MemoryStream(b'')
+   
    assert m.new_data == {}
    assert Infos.new_stat_data == {'proxy': True}
+    assert m.db.new_stat_data == {'proxy': True}
+    assert c.db.new_stat_data == {'proxy': True}
    assert 1 == m.db.stat['proxy']['Unknown_Msg']
+    assert 1 == c.db.stat['proxy']['Unknown_Msg']
+    Infos.new_stat_data['proxy'] =  False
+
+    c.inc_counter('Unknown_Msg')
+    assert m.new_data == {}
+    assert Infos.new_stat_data == {'proxy': True}
+    assert m.db.new_stat_data == {'proxy': True}
+    assert c.db.new_stat_data == {'proxy': True}
+    assert 2 == m.db.stat['proxy']['Unknown_Msg']
+    assert 2 == c.db.stat['proxy']['Unknown_Msg']
+    Infos.new_stat_data['proxy'] =  False
+
+    c.inc_counter('Modbus_Command')
+    assert m.new_data == {}
+    assert Infos.new_stat_data == {'proxy': True}
+    assert m.db.new_stat_data == {'proxy': True}
+    assert c.db.new_stat_data == {'proxy': True}
+    assert 2 == m.db.stat['proxy']['Modbus_Command']
+    assert 2 == c.db.stat['proxy']['Modbus_Command']

    Infos.new_stat_data['proxy'] =  False
    m.dec_counter('Unknown_Msg')
    assert m.new_data == {}
    assert Infos.new_stat_data == {'proxy': True}
-    assert 0 == m.db.stat['proxy']['Unknown_Msg']
+    assert 1 == m.db.stat['proxy']['Unknown_Msg']
    m.close()
+
+def test_msg_modbus_req(ConfigTsunInv1, MsgModbusCmd):
+    ConfigTsunInv1
+    m = MemoryStream(b'')
+    m.id_str = b"R170000000000001" 
+    m.state = m.STATE_UP
+
+    c = m.createClientStream(MsgModbusCmd)
+    
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 0
+    m.db.stat['proxy']['Invalid_Msg_Format'] = 0
+    c.read()         # read complete msg, and dispatch msg
+    assert not c.header_valid  # must be invalid, since msg was handled and buffer flushed
+    assert c.msg_count == 1
+    assert c.id_str == b"R170000000000001" 
+    assert c.unique_id == 'R170000000000001'
+    assert int(c.ctrl)==112
+    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.id_str == b"R170000000000001" 
+    assert m._forward_buffer==b''
+    assert m._send_buffer==b''
+    assert m.writer.sent_pdu == MsgModbusCmd
+    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
+    m.close()
+
+def test_msg_modbus_req2(ConfigTsunInv1, MsgModbusCmd):
+    ConfigTsunInv1
+    m = MemoryStream(b'')
+    m.id_str = b"R170000000000001" 
+
+    c = m.createClientStream(MsgModbusCmd)
+    
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 0
+    m.db.stat['proxy']['Invalid_Msg_Format'] = 0
+    c.read()         # read complete msg, and dispatch msg
+    assert not c.header_valid  # must be invalid, since msg was handled and buffer flushed
+    assert c.msg_count == 1
+    assert c.id_str == b"R170000000000001" 
+    assert c.unique_id == 'R170000000000001'
+    assert int(c.ctrl)==112
+    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.id_str == b"R170000000000001" 
+    assert m._forward_buffer==b''
+    assert m._send_buffer==b''
+    assert m.writer.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
+    m.close()
+
+def test_msg_modbus_req3(ConfigTsunInv1, MsgModbusCmdCrcErr):
+    ConfigTsunInv1
+    m = MemoryStream(b'')
+    m.id_str = b"R170000000000001" 
+    c = m.createClientStream(MsgModbusCmdCrcErr)
+    
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 0
+    m.db.stat['proxy']['Invalid_Msg_Format'] = 0
+    c.read()         # read complete msg, and dispatch msg
+    assert not c.header_valid  # must be invalid, since msg was handled and buffer flushed
+    assert c.msg_count == 1
+    assert c.id_str == b"R170000000000001" 
+    assert c.unique_id == 'R170000000000001'
+    assert int(c.ctrl)==112
+    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 m.db.stat['proxy']['Unknown_Ctrl'] == 0
+    assert m.db.stat['proxy']['Modbus_Command'] == 0
+    assert m.db.stat['proxy']['Invalid_Msg_Format'] == 1
+    m.close()
+
+def test_msg_modbus_rsp1(ConfigTsunInv1, MsgModbusRsp):
+    '''Modbus response without a valid Modbus request must be dropped'''
+    ConfigTsunInv1
+    m = MemoryStream(MsgModbusRsp)
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 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.unique_id == 'R170000000000001'
+    assert int(m.ctrl)==145
+    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.db.stat['proxy']['Unknown_Ctrl'] == 0
+    assert m.db.stat['proxy']['Modbus_Command'] == 0
+    m.close()
+
+def test_msg_modbus_rsp2(ConfigTsunInv1, MsgModbusResp20):
+    '''Modbus response with a valid Modbus request must be forwarded'''
+    ConfigTsunInv1
+    m = MemoryStream(MsgModbusResp20)
+    m.append_msg(MsgModbusResp20)
+
+    m.mb.rsp_handler = m.msg_forward
+    m.mb.last_addr = 1
+    m.mb.last_fcode = 3
+    m.mb.last_len = 20
+    m.mb.last_reg = 0x3008
+    m.mb.req_pend = True
+    m.mb.err = 0
+
+    assert m.db.db == {}
+    m.new_data['inverter'] = False
+
+    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 == 1
+    assert m._forward_buffer==MsgModbusResp20
+    assert m._send_buffer==b''
+    assert m.db.db == {'inverter': {'Version': 'V5.1.09', 'Rated_Power': 300}, 'grid': {'Voltage': 225.9, 'Current': 0.41, 'Frequency': 49.99, 'Output_Power': 94.8}, 'env': {'Inverter_Temp': 22}, 'input': {'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.new_data['inverter'] == True
+
+    m.new_data['inverter'] = False    
+    m.mb.req_pend = True
+    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==MsgModbusResp20
+    assert m._send_buffer==b''
+    assert m.db.db == {'inverter': {'Version': 'V5.1.09', 'Rated_Power': 300}, 'grid': {'Voltage': 225.9, 'Current': 0.41, 'Frequency': 49.99, 'Output_Power': 94.8}, 'env': {'Inverter_Temp': 22}, 'input': {'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.new_data['inverter'] == False
+
+    m.close()
+
+def test_msg_modbus_rsp3(ConfigTsunInv1, MsgModbusResp20):
+    '''Modbus response with a valid Modbus request must be forwarded'''
+    ConfigTsunInv1
+    m = MemoryStream(MsgModbusResp20)
+    m.append_msg(MsgModbusResp20)
+
+    m.mb.rsp_handler = m.msg_forward
+    m.mb.last_addr = 1
+    m.mb.last_fcode = 3
+    m.mb.last_len = 20
+    m.mb.last_reg = 0x3008
+    m.mb.req_pend = True
+    m.mb.err = 0
+
+    assert m.db.db == {}
+    m.new_data['inverter'] = False
+
+    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 == 1
+    assert m._forward_buffer==MsgModbusResp20
+    assert m._send_buffer==b''
+    assert m.db.db == {'inverter': {'Version': 'V5.1.09', 'Rated_Power': 300}, 'grid': {'Voltage': 225.9, 'Current': 0.41, 'Frequency': 49.99, 'Output_Power': 94.8}, 'env': {'Inverter_Temp': 22}, 'input': {'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.new_data['inverter'] == True
+    m.new_data['inverter'] = False
+    assert m.mb.req_pend == False
+
+    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==MsgModbusResp20
+    assert m._send_buffer==b''
+    assert m.db.db == {'inverter': {'Version': 'V5.1.09', 'Rated_Power': 300}, 'grid': {'Voltage': 225.9, 'Current': 0.41, 'Frequency': 49.99, 'Output_Power': 94.8}, 'env': {'Inverter_Temp': 22}, 'input': {'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.new_data['inverter'] == False
+
+    m.close()
+
+def test_msg_modbus_invalid(ConfigTsunInv1, MsgModbusInv):
+    ConfigTsunInv1
+    m = MemoryStream(MsgModbusInv, (0,), False)
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 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.unique_id == 'R170000000000001'
+    assert int(m.ctrl)==153
+    assert m.msg_id==119
+    assert m.header_len==23
+    assert m.data_len==13
+    assert m._forward_buffer==MsgModbusInv
+    assert m._send_buffer==b''
+    assert m.db.stat['proxy']['Unknown_Ctrl'] == 1
+    assert m.db.stat['proxy']['Modbus_Command'] == 0
+    m.close()
+
+def test_msg_modbus_fragment(ConfigTsunInv1, MsgModbusResp20):
+    ConfigTsunInv1
+    # receive more bytes than expected (7 bytes from the next msg)
+    m = MemoryStream(MsgModbusResp20+b'\x00\x00\x00\x45\x10\x52\x31', (0,))
+    m.db.stat['proxy']['Unknown_Ctrl'] = 0
+    m.db.stat['proxy']['Modbus_Command'] = 0
+    m.mb.rsp_handler = m.msg_forward
+    m.mb.last_addr = 1
+    m.mb.last_fcode = 3
+    m.mb.last_len = 20
+    m.mb.last_reg = 0x3008
+    m.mb.req_pend = True
+    m.mb.err = 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.unique_id == 'R170000000000001'
+    assert int(m.ctrl) == 0x91
+    assert m.msg_id == 119
+    assert m.header_len == 23
+    assert m.data_len == 50
+    assert m._forward_buffer==MsgModbusResp20
+    assert m._send_buffer == 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
+    assert m.db.stat['proxy']['Modbus_Command'] == 0
+    m.close()
+
+@pytest.mark.asyncio
+async def test_msg_build_modbus_req(ConfigTsunInv1, MsgModbusCmd):
+    ConfigTsunInv1
+    m = MemoryStream(b'', (0,), True)
+    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''
+
+    m.state = m.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 == MsgModbusCmd
+
+    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''
+    m.close()
+'''
+def test_zombie_conn(ConfigTsunInv1, MsgInverterInd):
+    ConfigTsunInv1
+    tracer.setLevel(logging.DEBUG)
+    start_val = MemoryStream._RefNo
+
+    m1 = MemoryStream(MsgInverterInd, (0,))
+    assert MemoryStream._RefNo == 1 + start_val
+    assert m1.RefNo == 1 + start_val
+    m2 = MemoryStream(MsgInverterInd, (0,))
+    assert MemoryStream._RefNo == 2 + start_val
+    assert m2.RefNo == 2 + start_val
+    m3 = MemoryStream(MsgInverterInd, (0,))
+    assert MemoryStream._RefNo == 3 + start_val
+    assert m3.RefNo == 3 + start_val
+    assert m1.state == m1.STATE_INIT
+    assert m2.state == m2.STATE_INIT
+    assert m3.state == m3.STATE_INIT
+    m1.read()         # read complete msg, and set unique_id
+    assert m1.state == m1.STATE_UP
+    assert m2.state == m2.STATE_INIT
+    assert m3.state == m3.STATE_INIT
+    m2.read()         # read complete msg, and set unique_id
+    assert m1.state == m1.STATE_CLOSED
+    assert m2.state == m2.STATE_UP
+    assert m3.state == m3.STATE_INIT
+    m3.read()         # read complete msg, and set unique_id
+    assert m1.state == m1.STATE_CLOSED
+    assert m2.state == m2.STATE_CLOSED
+    assert m3.state == m3.STATE_UP
+    m1.close()
+    m2.close()
+    m3.close()
+'''
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -1,6 +1,3 @@
-
-version: '3.0'
-
 services:
 #######  H O M E  -  A S S I S T A N T  ##### 
  home-assistant:
@@ -34,7 +31,7 @@ services:
    ports:
      - 8123:8123
    volumes:
-      - ${PROJECT_DIR}./homeassistant/config:/config
+      - ${PROJECT_DIR:-./}homeassistant/config:/config
      - /etc/localtime:/etc/localtime:ro
    healthcheck:
      test: curl --fail http://0.0.0.0:8123/auth/providers || exit 1
@@ -56,18 +53,18 @@ services:
    expose:
      - 1883
    volumes:
-      - ${PROJECT_DIR}./mosquitto/config:/mosquitto/config
-      - ${PROJECT_DIR}./mosquitto/data:/mosquitto/data
+      - ${PROJECT_DIR:-./}mosquitto/config:/mosquitto/config
+      - ${PROJECT_DIR:-./}mosquitto/data:/mosquitto/data
    networks:
-      outside:
-         ipv4_address: 172.28.1.5 # static IP required to receive mDNS traffic     
-    
+      - outside

+      

 #######  T S U N  -  P R O X Y  ######      
  tsun-proxy:
    container_name: tsun-proxy
    image: ghcr.io/s-allius/tsun-gen3-proxy:latest
+    # image: ghcr.io/s-allius/tsun-gen3-proxy:rc
    restart: unless-stopped
    depends_on:
      - mqtt
@@ -77,13 +74,13 @@ services:
      - GID=${GID:-1000}
    dns:
      - ${DNS1:-8.8.8.8}
-      - $(DNS2:-4.4.4.4}
+      - ${DNS2:-4.4.4.4}
    ports: 
      - 5005:5005
      - 10000:10000
    volumes:
-      - ${PROJECT_DIR}./tsun-proxy/log:/home/tsun-proxy/log 
-      - ${PROJECT_DIR}./tsun-proxy/config:/home/tsun-proxy/config 
+      - ${PROJECT_DIR:-./}tsun-proxy/log:/home/tsun-proxy/log 
+      - ${PROJECT_DIR:-./}tsun-proxy/config:/home/tsun-proxy/config 
    networks:
      - outside

@@ -93,11 +90,4 @@ services:
 networks:
  outside:
    name: home-assistant
-    external: true
-    ipam:
-      driver: default
-      config:
-        - subnet: 172.28.1.0/26
-          ip_range: 172.28.1.32/27
-          gateway: 172.28.1.62          
          
--- a/system_tests/test_tcp_socket.py
+++ b/system_tests/test_tcp_socket.py
@@ -224,7 +224,7 @@ def test_send_inv_data(ClientConnection, MsgTimeStampReq, MsgTimeStampResp, MsgI
        data = s.recv(1024)
    except TimeoutError:
        pass
-   # time.sleep(32.5)
+  #  time.sleep(32.5)
  #  assert data == MsgTimeStampResp
    try:
        s.sendall(MsgInvData)
--- a/system_tests/test_tcp_socket_v2.py
+++ b/system_tests/test_tcp_socket_v2.py
@@ -19,6 +19,9 @@ def get_inv_no() -> bytes:
 def get_invalid_sn():
    return b'R170000000000002'

+def correct_checksum(buf):
+    checksum = sum(buf[1:]) & 0xff
+    return checksum.to_bytes(length=1)

@pytest.fixture
 def MsgContactInfo(): # Contact Info message
@@ -61,10 +64,11 @@ def MsgDataInd():
    msg += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
    msg += b'\x00\x01\x12\x02\x12\x12\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
    msg += b'\x40\x10\x08\xd8\x00\x09\x13\x84\x00\x35\x00\x00\x02\x58\x00\xd8'
-    msg +=  b'\x01\x3f\x00\x17\x00\x4d\x01\x44\x00\x14\x00\x43\x01\x45\x00\x18'
+    msg += b'\x01\x3f\x00\x17\x00\x4d\x01\x44\x00\x14\x00\x43\x01\x45\x00\x18'
    msg += b'\x00\x52\x00\x12\x00\x01\x00\x00\x00\x7c\x00\x00\x24\xed\x00\x2c'
    msg += b'\x00\x00\x0b\x10\x00\x26\x00\x00\x0a\x0f\x00\x30\x00\x00\x0b\x76'
-    msg += b'\x00\x00\x00\x00\x06\x16\x00\x00\x00\x00\x55\xaa\x00\x01\x00\x00'
+
+    msg += b'\x00\x00\x00\x00\x06\x16\x00\x00\x00\x01\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'
    msg += b'\x09\xcd\x07\xb6\x13\x9c\x13\x24\x00\x01\x07\xae\x04\x0f\x00\x41'
@@ -73,7 +77,9 @@ def MsgDataInd():
    msg += b'\x04\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\x24\x15'
+    msg += b'\x00\x00\x00\x00'
+    msg += correct_checksum(msg)
+    msg += b'\x15'
    return msg

@pytest.fixture
@@ -147,4 +153,6 @@ def test_data_ind(ClientConnection,MsgDataInd, MsgDataResp):
    except TimeoutError:
        pass
    # time.sleep(2.5)
-    checkResponse(data, MsgDataResp)
+    checkResponse(data, MsgDataResp)
+
+
Author	SHA1	Message	Date
Stefan Allius	f3e69ff217	Dev 0.8 (#107 ) * S allius/issue102 (#103) * hotfix: don't send two MODBUS commands together * Update README.md Exchange logger fw version with the real inverter fw version in the compatibility table * Update python-app.yml run also on pushes to issue branches fix name for issues branches * S allius/issue104 (#105) * Update README.md Exchange logger fw version with the real inverter fw version in the compatibility table * Update python-app.yml run also on pushes to issue branches fix name for issues branches * fix forwarding of MODBUS responses * fix unit tests * update changelog * update changelog	2024-06-21 18:41:54 +02:00
Stefan Allius	a3c054d2b1	Dev 0.8 (#106 ) * S allius/issue102 (#103) * hotfix: don't send two MODBUS commands together * Update README.md Exchange logger fw version with the real inverter fw version in the compatibility table * Update python-app.yml run also on pushes to issue branches fix name for issues branches * S allius/issue104 (#105) * Update README.md Exchange logger fw version with the real inverter fw version in the compatibility table * Update python-app.yml run also on pushes to issue branches fix name for issues branches * fix forwarding of MODBUS responses * fix unit tests * update changelog	2024-06-21 18:12:48 +02:00
Stefan Allius	c34b33ed5f	Update python-app.yml fix name for issues branches	2024-06-08 23:39:28 +02:00
Stefan Allius	0a18918326	Update python-app.yml run also on pushes to issue branches	2024-06-08 23:23:56 +02:00
Stefan Allius	aa3bb4a1fa	Merge pull request #86 from s-allius/dev-0.8.0 Dev 0.8.0	2024-06-07 19:51:55 +02:00
Stefan Allius	a62864218d	update for version 0.8.0	2024-06-07 19:48:41 +02:00
Stefan Allius	0b2631c162	beautify some traces	2024-06-07 19:27:36 +02:00
Stefan Allius	c59bd16664	change log level for some traces	2024-06-05 22:01:48 +02:00
Stefan Allius	039a021cda	cleanup trace output	2024-06-04 21:55:57 +02:00
Stefan Allius	49e2dfbd86	optimize docker-compose.yaml file	2024-06-04 20:27:15 +02:00
Stefan Allius	e6ecf5911b	remove the external network expectation	2024-06-04 20:00:39 +02:00
Stefan Allius	6e1ed5d1e7	check the docker-compose.yaml file as last step	2024-06-03 20:59:21 +02:00
Stefan Allius	ad885e9644	add Y47 serial numbers	2024-06-03 20:40:35 +02:00
Stefan Allius	8f81ceda98	fix warnings and remove obsolete version	2024-06-03 20:28:14 +02:00
Stefan Allius	8204cae2b1	improve logging output	2024-06-03 19:52:37 +02:00
Stefan Allius	8baa68e615	fix typo (wrong bracket)	2024-06-02 14:08:06 +02:00
Stefan Allius	56f36e9f3f	build release candidate as paket	2024-05-31 23:09:33 +02:00
Stefan Allius	5b60d5dae1	cleanup	2024-05-31 23:09:14 +02:00
Stefan Allius	c1c38ab5c7	Merge pull request #82 from s-allius/s-allius/issue77 S allius/issue77	2024-05-31 20:17:40 +02:00
Stefan Allius	ec4261ae84	Merge branch 'dev-0.8.0' into s-allius/issue77	2024-05-31 20:17:03 +02:00
Stefan Allius	be57d11214	update changelog	2024-05-31 20:13:45 +02:00
Stefan Allius	685c2dc07b	fix unit tests	2024-05-31 20:10:22 +02:00
Stefan Allius	d27fe09006	reduce size of trace file - trace heartbeat and regular modbus pakets only with log level DBEUG - don't forwar akc pakets from tsun to inverter since we answered in before	2024-05-31 20:03:21 +02:00
Stefan Allius	e850a8c534	set tracer log level by environment value	2024-05-31 20:02:21 +02:00
Stefan Allius	33f215def2	Update README.md fix typo	2024-05-30 20:30:48 +02:00
Stefan Allius	4be726166e	Merge pull request #81 from s-allius/s-allius/issue80 S allius/issue80	2024-05-30 19:57:45 +02:00
Stefan Allius	20f4fd647c	update config example	2024-05-30 19:44:54 +02:00
Stefan Allius	407c1ceb2b	control access via AT commands	2024-05-30 19:40:25 +02:00
Stefan Allius	c6eecb4791	add missing testcases	2024-05-30 19:32:53 +02:00
Stefan Allius	87d59d046f	add AT_COMMAND_BLOCKED counter	2024-05-30 19:32:14 +02:00
Stefan Allius	063850c7fb	add allow and block filter for AT+ commands	2024-05-30 18:38:05 +02:00
Stefan Allius	17c33601a0	Merge pull request #79 from s-allius/s-allius/issue77 S allius/issue77	2024-05-28 22:02:54 +02:00
Stefan Allius	3980ac013b	catch all OSError errors in the read loop	2024-05-28 21:55:42 +02:00
Stefan Allius	66657888dd	add log_level support for modbus commands	2024-05-28 19:32:20 +02:00
Stefan Allius	ab9e798152	add typing	2024-05-28 19:30:58 +02:00
Stefan Allius	fdf3475909	fix unit test	2024-05-27 20:56:03 +02:00
Stefan Allius	edc2c12b5b	Send MQTT topic for responses to AT+ commands	2024-05-27 20:52:06 +02:00
Stefan Allius	5c6f9e7414	increase test coverage to 100%	2024-05-23 19:52:55 +02:00
Stefan Allius	0fc74b0d19	improve unit test	2024-05-22 22:54:23 +02:00
Stefan Allius	87cc3fb205	fix frong MQTT not found logs	2024-05-22 22:53:52 +02:00
Stefan Allius	8fc5eb3670	log MQTT to data topic	2024-05-22 22:53:04 +02:00
Stefan Allius	55fc834a1e	reduce default loggings	2024-05-22 22:52:02 +02:00
Stefan Allius	da2388941e	allow only one MODBUS retry - More than one retry usually makes no sense, as random errors are usually corrected. If the first retry also fails, the chance that a second or third retry will be successful is very small	2024-05-21 19:37:55 +02:00
Stefan Allius	9e38cb93ea	send StatusReq additionally every 30 minutes	2024-05-21 18:59:30 +02:00
Stefan Allius	de1c48fa62	add keyword for timeout to argument list	2024-05-21 18:58:10 +02:00
Stefan Allius	e432441134	don't log Events as Infos	2024-05-21 18:56:52 +02:00
Stefan Allius	98ef252bb0	don't forward invalid MODBUS responses	2024-05-20 18:51:55 +02:00
Stefan Allius	25e3db36c4	Merge pull request #74 from s-allius/s-allius/issue73 S allius/issue73	2024-05-20 18:38:11 +02:00
Stefan Allius	3ac48dad1f	cleanup	2024-05-20 18:33:01 +02:00
Stefan Allius	eff3e7558b	increase test coverage	2024-05-20 16:53:26 +02:00
Stefan Allius	6ef6f4cd34	cleanup	2024-05-20 00:48:23 +02:00
Stefan Allius	177706c3e6	test Modbus retries	2024-05-19 21:17:56 +02:00
Stefan Allius	9ac1f6f46d	add Modbus retrasmissions	2024-05-19 21:17:16 +02:00
Stefan Allius	3cc5f3ec53	- add Modbus fifo and timeout handler	2024-05-19 13:45:52 +02:00
Stefan Allius	23ff2bb05c	fix unit tests	2024-05-19 13:44:16 +02:00
Stefan Allius	c761446c11	code cleanup	2024-05-19 13:43:51 +02:00
Stefan Allius	f30aa07431	don't frwd received modbus req directly - use always the fifoto sent valid req to the inverter - code cleanup	2024-05-19 13:42:29 +02:00
Stefan Allius	476c5f0006	adapt unit tests	2024-05-19 12:24:35 +02:00
Stefan Allius	282a459ef0	add Modbus response forwarding	2024-05-19 12:23:58 +02:00
Stefan Allius	d25173e591	fix sending next pdu before we have parsed the last response	2024-05-18 23:11:49 +02:00
Stefan Allius	9c39ea27f7	fix unit tests	2024-05-18 23:10:47 +02:00
Stefan Allius	766774224b	adapt unit tests	2024-05-18 21:46:28 +02:00
Stefan Allius	f4da16987f	add fifo and timeout handler for modbus	2024-05-18 20:18:15 +02:00
Stefan Allius	841877305d	timeout handler removed again, as it has no positive effect	2024-05-15 23:15:20 +02:00
Stefan Allius	fb5c6a74cf	Merge pull request #70 from s-allius/s-allius/issue69 S allius/issue69	2024-05-13 23:05:34 +02:00
Stefan Allius	14425da5fa	improve Modbus logging	2024-05-13 22:48:44 +02:00
Stefan Allius	6877465915	add more unit tests	2024-05-13 22:47:52 +02:00
Stefan Allius	2e214b1e71	avoid sending responses to TSUN for local at commands	2024-05-13 22:46:23 +02:00
Stefan Allius	036af8e127	move the Modbus instance to the parent class	2024-05-13 19:49:00 +02:00
Stefan Allius	92469456b7	fix unit tests	2024-05-12 23:11:55 +02:00
Stefan Allius	1658036a26	store modbus params always on the server side	2024-05-12 23:09:51 +02:00
Stefan Allius	1ae7784bee	add more unit tests	2024-05-11 23:41:40 +02:00
Stefan Allius	e43a02c508	improve modbus parsing - parse Modbus messages well if another msg follows in the receive buffer	2024-05-11 23:40:46 +02:00
Stefan Allius	4ea70dee64	improve connection handling - insure close() call after graceful disconnect, to release proxy internal resources - timeout handler disconnect inverter connection if no message was received for longer than 2.5 minutes	2024-05-11 20:55:31 +02:00
Stefan Allius	6fcf4f47c2	add more unit tests	2024-05-11 20:53:39 +02:00
Stefan Allius	73baffe9e0	also get the 'Daily Generation' every minute	2024-05-11 20:50:26 +02:00
Stefan Allius	3fda08bd25	add more unit tests	2024-05-11 20:48:57 +02:00
Stefan Allius	0e7fbc7820	fix Modbus CRC errors - parse Modbus messages well if another msg follows in the receive buffer	2024-05-11 20:46:36 +02:00
Stefan Allius	26f108cc51	build version string in the same format as TSUN	2024-05-10 20:50:37 +02:00
Stefan Allius	dd438bf201	add comment	2024-05-09 23:38:34 +02:00
Stefan Allius	f48596a512	use actions/setup-python@v5	2024-05-09 23:38:02 +02:00
Stefan Allius	6a64484174	read `Designed Power' with Modbus	2024-05-09 23:34:29 +02:00
Stefan Allius	def5702415	upgrade version fron v3 to v4	2024-05-09 23:31:22 +02:00
Stefan Allius	b3f0fc97d7	add more unit tests	2024-05-09 23:23:33 +02:00
Stefan Allius	65973b2835	fix unit tests	2024-05-09 18:48:59 +02:00
Stefan Allius	b240b74994	avoid sending AT/Modbus commands too early - wait until we have received the first data from the inverter	2024-05-09 18:22:43 +02:00
Stefan Allius	93e82a2284	move state variable to the parent class	2024-05-09 18:22:08 +02:00
Stefan Allius	537d81fa19	add graceful shutdown	2024-05-09 16:49:59 +02:00
Stefan Allius	5fe455e42f	fix typo	2024-05-09 16:46:59 +02:00
Stefan Allius	5a0456650f	avoid sending modbus cmds in critical states	2024-05-09 14:20:57 +02:00
Stefan Allius	41d9a2a1ef	improve logger	2024-05-09 14:19:37 +02:00
Stefan Allius	a869ead89a	add MAX_DESIGNED_POWER (only readable by Modbus)	2024-05-09 14:16:15 +02:00
Stefan Allius	91873d0c34	await wait_closed() on disconnects	2024-05-08 23:52:31 +02:00
Stefan Allius	c4b3e1a817	Merge branch 'dev-0.8.0' of https://github.com/s-allius/tsun-gen3-proxy into dev-0.8.0	2024-05-08 23:50:18 +02:00
Stefan Allius	0ac4b1f571	add more unit tests	2024-05-08 23:50:04 +02:00
Stefan Allius	2ec0a59cd3	add modbus long int support	2024-05-08 23:48:41 +02:00
Stefan Allius	2d176894d3	remove unneeded sleep() call	2024-05-08 23:46:24 +02:00
Stefan Allius	0ae6dffc6b	Update test_talent.py	2024-05-07 22:54:23 +02:00
Stefan Allius	5fc1b16627	Update README.md	2024-05-07 22:52:20 +02:00
Stefan Allius	eab109ddab	install pytest-asyncio	2024-05-07 22:37:17 +02:00
Stefan Allius	1b6bee12de	Merge pull request #67 from s-allius/s-allius/issue65 S allius/issue65	2024-05-07 22:31:40 +02:00
Stefan Allius	2301511242	update documentation	2024-05-07 22:11:55 +02:00
Stefan Allius	3fd528bdbe	improve logging	2024-05-07 21:20:12 +02:00
Stefan Allius	e15387b1ff	fix modbus trace	2024-05-07 19:41:07 +02:00
Stefan Allius	02d9f01947	don't send AT or Modbus cmds on closed connections	2024-05-07 18:32:56 +02:00
Stefan Allius	39beb0cb44	add more modbus tests	2024-05-07 18:02:09 +02:00
Stefan Allius	d5010fe053	parse modbus corect if we have received more than one message	2024-05-07 17:56:54 +02:00
Stefan Allius	54d2bf4439	set err value for unit tests	2024-05-07 17:52:51 +02:00
Stefan Allius	f804b755a4	improve modbus trace	2024-05-06 23:18:47 +02:00
Stefan Allius	bf0f152d5a	add unit tests for modbus	2024-05-05 20:20:19 +02:00
Stefan Allius	29ee540a19	add cron tasks for modbus requests every minute	2024-05-05 20:18:45 +02:00
Stefan Allius	5822f5de50	update changelog	2024-05-05 20:18:19 +02:00
Stefan Allius	283ae31af2	parse modbus message and store values in db	2024-05-05 20:16:28 +02:00
Stefan Allius	808bf2fe87	add MQTT topic for AT commands	2024-05-05 20:15:36 +02:00
Stefan Allius	fa2626ec7a	add modbus resp handler	2024-05-05 20:14:51 +02:00
Stefan Allius	eda8ef1db6	add Modbus and AT command handler	2024-05-05 20:13:51 +02:00
Stefan Allius	3dbcee63f6	add Modbus topics	2024-05-03 18:25:37 +02:00
Stefan Allius	f2c4230a49	use async_write instead of flush_send_msg()	2024-05-03 18:24:48 +02:00
Stefan Allius	763af8b4cf	add send_modbus_cmd()	2024-05-03 18:24:06 +02:00
Stefan Allius	a2f67e7d3e	use async_write() instead of flush_send_msg()	2024-05-03 18:23:08 +02:00
Stefan Allius	f78d4ac310	remove flush_send_msg()	2024-05-03 18:22:31 +02:00
Stefan Allius	fdedfcbf8e	reneme Modbus constants	2024-05-03 18:21:59 +02:00
Stefan Allius	494c30e489	renme __async_write() into async_write()	2024-05-03 18:21:15 +02:00
Stefan Allius	30dc802fb2	Add MQTT subscrition for modbus experiences	2024-05-03 00:05:34 +02:00
Stefan Allius	5fdad484f4	add flush_send_msg() implementation	2024-05-03 00:03:02 +02:00
Stefan Allius	dba3b458ba	add Modbus support	2024-05-02 23:59:55 +02:00
Stefan Allius	1d9cbf314e	add Modbus tests	2024-05-02 23:56:42 +02:00
Stefan Allius	58c3333fcc	initial checkin	2024-05-02 23:55:59 +02:00
Stefan Allius	530687039d	Add Modbus_Command counter	2024-05-01 11:57:32 +02:00
Stefan Allius	5d0c95d6e6	fix typo	2024-05-01 11:57:02 +02:00
Stefan Allius	e603bb9baa	Merge pull request #64 from s-allius/test-config Improve config parsing and add unit tests	2024-04-28 20:58:30 +02:00
Stefan Allius	e8902f7923	Merge branch 'dev-0.8.0' of https://github.com/s-allius/tsun-gen3-proxy into test-config	2024-04-28 19:08:00 +02:00
Stefan Allius	b1e577d357	Merge pull request #63 from s-allius/s-allius/issue61 S allius/issue61	2024-04-28 19:02:12 +02:00
Stefan Allius	4e8fd8e2a2	update changelog	2024-04-28 18:34:51 +02:00
Stefan Allius	d34862260e	Convert data collect interval to minutes	2024-04-28 18:34:11 +02:00
Stefan Allius	c061d263eb	Convert data collect interval to minutes	2024-04-28 18:32:26 +02:00
Stefan Allius	ccc7e7959e	change unit of the collect interval to minutes	2024-04-28 18:31:33 +02:00
Stefan Allius	7b4ed406a1	Update README.md Exchange logger fw version with the real inverter fw version in the compatibility table	2024-04-23 22:26:01 +02:00
Stefan Allius	549fca8ae5	Add unit tests for the Config class	2024-04-23 21:50:13 +02:00
Stefan Allius	f73376b330	initinal commit	2024-04-22 23:09:33 +02:00
Stefan Allius	220f2cce18	improve config handling - fetch validating exceptions - don't crash on missing config params	2024-04-22 23:07:13 +02:00
Stefan Allius	e2a5c7e640	Merge branch 'main' of https://github.com/s-allius/tsun-gen3-proxy into dev-0.8.0	2024-04-22 20:27:38 +02:00
Stefan Allius	2e64ae5884	ignore non realtime values - data with frametype 0x81 are non realtime values. Since HA only supports realtime values, we don't parse them for now	2024-04-22 20:24:52 +02:00
Stefan Allius	95ebb92f05	cleanup - chance log level from INFO to DEBUG - remove experimental value Register.VALUE_1 - format Register.POWER_ON_TIME as integer	2024-04-22 20:20:39 +02:00
Stefan Allius	59dabbfa4a	change logging level to debug	2024-04-21 23:57:59 +02:00
Stefan Allius	aa0d432149	Update CHANGELOG.md add version 0.7.0	2024-04-21 22:54:01 +02:00
Stefan Allius	6dbf259e44	add postfix for rc and dev versions	2024-04-21 22:48:33 +02:00
Stefan Allius	184d0464c9	Merge pull request #58 from s-allius/dev-0.7.0 Dev 0.7.0	2024-04-20 10:32:43 +02:00
Stefan Allius	8998c583ab	Create FUNDING.yml	2024-04-16 22:39:43 +02:00