So, while commands like “Siri, turn off the lights in the living room” will always work while connected to your home Wi-Fi network, they won’t from the airport unless you have an Apple TV. But that’s it — you can still switch off the lights with an app, no Apple TV required. This behavior has been confirmed by a source close to HomeKit’s development as well as two launch partners who wish to remain anonymous. Only third-generation or later Apple TVs running software 7.0 or later will support HomeKit.