Add MQTT support as well?

[glith]

It would be great if we could add MQTT support as well. Just like this:
https://github.com/kvj/hass_Mtastic_MQTT

[mcmasterp]

This seems like a logical feature

[broglep]

There were some ideas around this, but still unclear if it really fits into the existing architecture without too much effort. This integration was built primarily for the direct device communication, thus uses this particular protocol (over serial, bluetooth and TCP) the same way as the other clients do. The MQTT protocol is rather different, but because it is still speaking same protobuf messages, support is generally possible, but likely with some limitations as MQTT is only a subset of the actual communication protocol