Homebridge emulates the iOS Homekit API
github.com
github.com
Semi-related - what does the new AppleTV have to do with Homekit? It apparently does somehow enable connectivity, though the Siri instance running on the AppleTV doesn't seem to be able to interact with any local devices.
(Having Domoticz automatically turn them on when the door sensor triggers is even greater, but I think it's more impressive to be able to have Siri do it.)
I use a Raspberry Pi 2 as the server. Due to the NodeJS dependency you need a more recent ARM instruction set, so RPi v1 does not work.