fix client_mode configuration block (#252)

* fix client_mode block

* add client mode

* fix tests with client_mode values

* log client_mode configuration

* add forward flag for client_mode

* improve startup logging

* added client_mode example

* adjusted translation files

* AT commands added

* typo

* missing "PLUS"

* link to config details

* improve log msg for config problems

* improve log msg on config errors

* improve log msg for config problems

* copy CHANGELOG.md into add-on repro

---------

Co-authored-by: Michael Metz <michael.metz@siemens.com>

ha_addons/ha_addon/DOCS.md

@@ -71,6 +71,9 @@ inverters:
     node_id: PV-Garage
     suggested_area: Garage
     modbus_polling: true
+    client_mode.host: 192.168.x.x
+    client_mode.port: 8899
+    client_mode.forward: true
     pv1.manufacturer: Shinefar
     pv1.type: SF-M18/144550
     pv2.manufacturer: Shinefar
@@ -83,6 +86,8 @@ inverters:
 
 **Note**: _This is just an example, you need to replace the values with your own!_
 
+more information about the configuration can be found in the [configuration details page][configdetails].
+
 ## MQTT settings
 
 By default, this add-on requires no `mqtt` config from the user. **This is not an error!**
@@ -154,3 +159,4 @@ SOFTWARE.
 [AdGuard]: https://github.com/hassio-addons/addon-adguard-home
 [repository-badge]: https://img.shields.io/badge/Add%20repository%20to%20my-Home%20Assistant-41BDF5?logo=home-assistant&style=for-the-badge
 [repository-url]: https://my.home-assistant.io/redirect/supervisor_add_addon_repository/?repository_url=https%3A%2F%2Fgithub.com%2Fs-allius%2Fha-addons
+[configdetails]: https://github.com/s-allius/tsun-gen3-proxy/wiki/Configuration-details