Feature request: color change homekit integration

[sverrevh]

This plugin for homebridge (https://github.com/szokeptr/homebridge-tradfri-plugin) supports colors in Homekit. According to michbeck100/pimatic-hap#74 (comment) changes need to be made to this plugin first in order to get it working with the pimatic-HAP plugin.

[treban]

This plugin already has implemented color changing. I think a accessory definition in the homekit plugin is needed. I will check the homekit interface, change my plugin if needed and make a pull request to make it possible.

[sverrevh]

Homekit/Pimatic-HAP expects a color in Hue and Saturation:
Starting here is the conversion code from XY to Hue/saturation/light and the other way around:
https://github.com/szokeptr/homebridge-tradfri-plugin/blob/master/index.js#L3542

http://stackoverflow.com/a/9493060
http://stackoverflow.com/a/36061908

[michbeck100]

The conversion however must be done in pimatic-hap. I will have a look into this.

[sverrevh]

This is actually now less of an issue when you let the gateway handle HomeKit directly, also makes more sense to do so.