Enables HK Thermostat type accessory to turn off

[banboobee]

This PR enables turning HK thermostat type accessories to OFF.

I was wondering and frustrated that there's no way for turning HK thermostat type accessories to OFF from day 1. I think this not limited on my environment, as shown in https://github.com/NorthernMan54/homebridge-alexa/wiki/Thermostat-Voice-Control-Comparison.

Recently I found an Amazon document describing that this is an intended behavior, and recommends to implement PowerController for air conditioners.

https://developer.amazon.com/en-US/docs/alexa/device-apis/alexa-thermostatcontroller.html#discover-response-example-for-an-air-conditioner

According to the document, this PR adds PowerController entries for discover, response, and stateReport for HK thermostat services to enable turning them ON/OFF. Turning ON is internally interpreted as COOL as in homebridge-gsh.

Currently, this is working well in my environment, and I hope anyone try to see if any issues or side effects.

[NorthernMan54]

Tks for this enhancement, let me do some local testing with it and see how it goes.

[NorthernMan54]

Added to the current beta package along with dependancy updates

[NorthernMan54]

This is bundled into homebridge-alexa@0.6.9-beta.11

[banboobee]

Thanks. It is great if integrated to this amazing plugin.

[NorthernMan54]

I was testing this, and had my AC just turn on during the middle of winter here in Canada, outdoor temps were below freezing. Am thinking that wiring Turn on to Cool is problematic in some regions.

Am going to look at adding config option to choose the Turn on behaviour.

[NorthernMan54]

Beta 18 includes the ability to change the Thermostat Turn On behaviour with a new config setting thermostatTurnOn which defaults to Cool - 2.

This is the likely release candidate after further regression testing of the package.

[banboobee]

Adding an option is also good for heat only accessories.👍

[NorthernMan54]

After a bit more thought about the impact to existing users, I made a couple more tweaks to the behaviour. I removed the Turn On action if thermostatTurnOn is unset. With this tweak, when you ask Alexa to Turn On Alexa will respond with That command does not work on device ... unless thermostatTurnOn is configured. Which is the existing behaviour. To enable Turn On, they need to set the mode in the config settings.

Hopefully this will now be the final - homebridge-alexa (0.6.9-beta.19)

This is what is it looks like in the config menu.

[NorthernMan54]

And published as release 0.6.9

Tks very much for this feature

[banboobee]

I'm really happy to collaborate with you, and contribute to this amazing plugin.

[banboobee]

Just FYI. Updated to 0.6.9 and set thermostatTurnOn to auto. Working well. Great.

[NorthernMan54]

Tks for the feedback, much appreciated.