Entitiy availability

[farmio]

Context

Due to lack of support for lock / read-only entity status in Home Assistant (what DPT 2 is commonly used for in KNX) we should find an alternative approach to reflect that somehow. Eg. when a cover is locked, but a move-telegram is received, we can't know if it is actually moving.

Proposal

Add an optional availability key for knx entities allowing to configure one or multiple group addresses (DPT 1 or 2) to allow setting the availability property of a KNX entity.

knx:
  light:
    - address: 1/1/1
      ...
      availability:
        - state_address: 4/4/4
          type: 2
          available_payload: 0

Considerations

• The locked state couldn't be differentiated from disconnected state