In iOS 11, Apple allows device manufacturers to retroactively add HomeKit support to existing home automation devices that rely natively on other standards. Philips is taking advantage of that change and has added HomeKit support to the Hue Smart Tap Switch, Hue Smart Dimmer Switch, and Hue Smart Motion Sensor. HomeKit support does require a second-generation Hue Smart Bridge, but all three of those devices need the Hue Smart Bridge to operate anyway. In theory, you should be able to use these Hue switches and sensors to trigger any other HomeKit device. follow link
Thoughtful, detailed coverage of the Mac, iPhone, and iPad, plus the TidBITS Content Network for Apple consultants.
Philips Adds HomeKit Support to Hue Accessories