sorry, forgot to mention that this issue is solved. I wrote a tutorial:
Hi,
I’m using Notifications for Android TV.
This is meant to display received notifications from your phone on your android TV. However, the developer is open to give away a non-disclosed API. You may even show your camera picture or something!
Best way, I guess
-Sascha
The best way to know why GCM registration failed is to capture a log of your phone. We want to implement some information why gcm registration failed in the app in the future.
See Inform user why GCM registration failed · Issue #560 · openhab/openhab-android · GitHub
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