Feature request for mqtt: discovery for Home Assistant

[MaxRower]

Home Assistant won't recognize devices until there is some sort of announcement, what kind of fields to expect in the payload. Maybe this could be included in the mqtt service?

Example of one field in a Sonoff temp & humidity sensor:
MQTT publish: topic 'homeassistant/sensor/0x00124b00253c5f14/temperature/config', payload '{"availability":[{"topic":"myhome/bridge/state",
"value_template":"{{ value_json.state }}"}],"device":{"identifiers":["zigbee2mqtt_0x00124b00253c5f14"],"manufacturer":"SONOFF","model":"Temperature and humidity sensor
(SNZB-02)","name":"Temp Sensor"},"device_class":"temperature","enabled_by_default":true,"name":"Temp Sensor temperature","state_class":"measurement","state_to
pic":"myhome/Temp Sensor","unique_id":"0x00124b00253c5f14_temperature_myhome","unit_of_measurement":"°C","value_template":"{{ value_json.temperature }}"}'

Messages should be generated according to the weather.ini template_txt config.

[pkerney]

My guess is that you want automatic recognition like Tasmota does?
I have pywws integrating with my HA, but it is very manual.
I can paste my pyswws:weather.ini and my hassio:configuration.yaml if you need it.
You may be able to do it with the template_txt parameter from the [mqtt] section, but I decoded it on the hassio side as I didn't want to break some other platforms I have setup.