Retrieve the account ID from the Sibionics GS3 server.
GS3 sensors have an built-in account binding mechanism to make it impossible to use a sensor with a different account that it was previously used with. For this an account ID number associated with the account is retrieved from the server.
If you want to use a sensor previously used with the Sibionics GS3 app, you need to retrieve this ID from their server.
If you have root access on your phone, you can also find it in the data directory of Sibionics GS3 app:
/data/data/com.sisensing.gs3/shared_prefs/sp_user.xml contains the element user_id with that value, for example: <string name="user_id">2019091906067780457</string>, when 2019091906067780457 is the user id.
It is also contained in some file names, for example:
/data/data/com.sisensing.gs3/files/mmkv/sp_user2019091906067780457
/data/data/com.sisensing.gs3/files/mmkv/sp_user2019091906067780457.crc
/data/data/com.sisensing.gs3/shared_prefs/2019091906067780457.xml