get the lamp status of Onvif camera

Question

I have an onvif camera and a toggle button to turn the lamp on and off. I use the tt:lamp|on style of commands sent to the Onvif endpoint. Is there a way to query the status of the camera and retrieve weather or not the lamp is on?

Answer 1

You should subscribe to the camera side events via the ONVIF event service and check if the camera is sending the current lamp status in the event stream. Most devices will give you a full initial state of all the things they can report through the event service as a response to the first PullMessage request.