Add ClimateEntityFeature.TURN_OFF for Google Assistant calls

[bryanyork]

Google Assistant expects to call the turn_off service which does not exist unless specifically enabled as a ClimateEntityFeature.TURN_OFF feature.

Previously calls to turn off my Kumo devices would fail silently from Google and an error message in Home Assistant regarding an unsupported service.

I have tested this change to fix my issue.

[bryanyork]

Discussion in #137

[bryanyork]

@dlarrick any thoughts on this one? Seems to work great for my setup. (Both via Google Assistant and Home Assistant apps)

[dlarrick]

Didn't we remove this to stop some deprecation warning? Let me dig up that PR too...

[dlarrick]

Yeah -- #155 which references #137

So with this change to your local files you're not seeing that warning? Or if you are, can you research the proper way to fix all this?

[dlarrick]

I am starting to think this PR is, in fact, exactly what's needed for Google Assistant: I was trying to understand how it could do Climate.TURN_ON without remembering what mode it was in last, but this PR avoids that issue.

I'm hoping to have some time to test over the next few weeks; but in the meantime if folks who have noted this issue could try out this PR, that would be helpful. @OmenWild @VeniceNerd @ilndboy

[mxr]

I can confirm I was experiencing this issue (with Alexa or even when triggering action: climate.turn_off). I applied this change and it works now. Thank you!

[mxr]

Thinking on this more, to support 2025.1, I think you actually need to implement turn_on and turn_off actions. For example see https://github.com/home-assistant/core/blob/d6c81830a41d4904127725f33a338a80de8839ad/homeassistant/components/zhong_hong/climate.py#L228-L234

I have done so in #176

[dlarrick]

Thinking on this more, to support 2025.1, I think you actually need to implement turn_on and turn_off actions.

I think that's incorrect. I think we can choose to implement turn_off only as long as we leave the _enable_turn_on_off_backwards_compatibility = False in place.

If I'm wrong here we'll have to do something else, like store the last HVAC mode in a file for use in turn_on.

[dlarrick]

#176 addressing the same issue is now merged.
I would accept a further PR to implement climate.turn_on if it somehow tracks what the last mode was, for example storing the last state in a JSON file (alongside kumo_cache.json).