I'm not sure what you are expecting here. CHoIP would define messaging that certified products must implement, meaning that an Amazon device and an Apple device

I'm not sure what you are expecting here. CHoIP would define messaging that certified products must implement, meaning that an Amazon device and an Apple device would send the same message to a Phillips light to turn it on, and that message would be carried over IP. The messaging would be agnostic of where the source is. It could be a device in the local network, or it could be a cloud-based service (assuming you open up your network). HomeKit, for example, works locally, either over BLE or WiFi.