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@Gordon
Any chance you can debug the Android Gadgetbridge app and check the characteristics? It's possible they are null.
If so, it might be related to https://codeberg.org/Freeyourgadget/Gadgetbridge/issues/2996 - it ends up connecting but then not being able to send/receive any data.
I guess in this state, nothing else works?eg you can't send a test message from the Gadgetbridge debug menu?
... although I wonder if it is that issue, as I didn't think a WriteAction would get created in that case?
Is it possible that a WriteAction is created for the wrong device handle or something?