EvergenEnergy / remote-commands-handler / 5341419864

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Add error handler to publish error messages via MQTT (#38)

* Add optional setting for MQTT topic to publish errors to, and bool value to be set if topic is supplied

* Check for both + and # in error topic name

* Add ErrorHandler module and provide to client modules. Use optional args for dependency objects so we can replace with mock if needed but don't need to invoke in main.py

* UTIL-565: publish errors via MQTT

* UTIL-565: use predefined categories for error messages

* Restructure MQTT classes to separate writer and reader

* Subscribe to configured topics in MQTT reader init

* Use MQTTClient as component rather than base class

* Remove MQTTClient, instantiate paho MQTT client in main.py and pass in

* Subclass ErrorHandler to avoid optional args to init

* Serialise message payload in errormessage rather than mqttwriter

* Use different internal MQTT clients for reader and writer; simplify writer by removing callbacks

* Reinstate initialisation of modbus TCP client in main.py

* Make a couple of MQTT reader attributes private

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