HomeAssistant MQTT discovery

[dersch81]

To support large usage of HASS it would be great if MQTT discovery would be integeated:

https://www.home-assistant.io/integrations/mqtt/

[rkoshak]

I don't use home assistant so someone else will have to implement it. But if a PR were submitted I would accept it and merge it. We've already Homie support so HA's MQTT standard wouldn't be out of the norm.