I've used Xdrip before, and it's device support is not that great either.
I'm not arguing against the idea. I'm being realistic about what devs and users can do about this situation.
If you're lucky enough to find something that works, I'm not knocking that.
"Kimi decompile this proprietary APK and find the communication channels used to communicate with this model GCM. Let me know what software you need to to install to achieve this "
The world is your oyster if you have some self motivation.