As far as I know, there is no way to determine if a bulb is connected to power or not using COAP-requests to the gateway. There is a "last seen" available in the IKEA app, I've not been able to find the corresponding entry in the available data from the gateway, and I really don't know if this ...

Hey folks, sorry for jumping in with the out of the blue question but couldn't find it being addressed on this long thread here: is there any way to detect when Tradfri lights are physically (wall switch) powered on and off? Old habits die hard and me and my family like to keep using the wall switch ...