Add unique id and device for better HA UI integration

[abmantis]

The unique id allows the device name and entity_id in HA to be edited from the UI. The "device" info allows the entities to be associated with a single device and appear on the MQTT Integrations UI.

[mcspr]

Hey.

I don't think it should add anything into the configuration yaml generator, see
https://www.home-assistant.io/components/switch.mqtt/#device
https://www.home-assistant.io/components/sensor.mqtt/#device

[abmantis]

@mcspr sorry, I don't understand what you mean.

[mcspr]

@abmantis try running ha.config in terminal:

sensor:
  - name: ESPURNA_3601AF_event
    platform: mqtt
    state_topic: test/ESPURNA-3601AF/event/0
    unit_of_measurement:
    uniq_id: ESPURNA-3601AF_14_1
    device: {"identifiers":["ESPURNA-3601AF"],"name":"ESPURNA_3601AF","manufacturer":"Espurna","model":"NODEMCU_LOLIN","sw_version":"1.13.4-dev (2f147ec0)"}

[abmantis]

Oh ok. So you think this should only be applied to the discovery message and not the generator. Is that it?

[mcspr]

Yes, it does not apply to anything other than discovery.

[abmantis]

Anything missing for this to be merged?

[mcspr]

...note that it pretty much does not work when switches are >3, on initial connection.
manual ha.send works (default build, where debug messages do yielding)

'll instigate fix from #1370