Hello,
I have an HDMI play sync box in my HUE installation.
I can stop with HE, the video sync of the HDMI box with a button by using the ‘stop entertainment program’ and selecting the entertainment room where is my HDMI box.
But there is no feature to start the video sync with a button.
I have to go to Philips Hue Sync and start the video sync.
I pay the premium option, but still not possible to ‘turn on’ entertainment of the HDMI play box.
Is it possible to add such a feature ? Even for the premium only 
Franck