The easiest way would be to use the official app and somehow sniff the data. In one of the comments I've described how I've done this. Easiest way would be to use an Android device, adb and wireshark to sniff the bluetooth traffic. Next step would be to disassemble the apk which might give you more hints, like strings and constants and maybe a glimpse of how it serializes/marshals the data. Hope this helps a bit.
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
The easiest way would be to use the official app and somehow sniff the data. In one of the comments I've described how I've done this. Easiest way would be to use an Android device,
adbandwiresharkto sniff the bluetooth traffic. Next step would be to disassemble theapkwhich might give you more hints, like strings and constants and maybe a glimpse of how it serializes/marshals the data. Hope this helps a bit.