SO i know this is a pretty old thread and most have probably given up on the idea but just to let you know i managed to get the openhab android app working on my watch (Ticwatch E running Wear OS). I uploaded a modified app here: Releases · LuggyLuke/openhab-android · GitHub and have opened a new ticket with the original repo. Its no way near a proper wear implementation but is nice for testing. Non wear apk’s can be installed on Wear OS using ADB. I might open a real Thread once i have run some more tests 
2 Likes