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The smart lock feature on Android allows someone to set a Bluetooth device as "trusted" which makes it easy to unlock. See for example: https://support.google.com/nexus/answer/6093922

I tried to add an Avantree Roxa device to play with this, but the log states:

I/Coffee - BluetoothTrustlet( 1549): Device Avantree Roxa is not allowed because it is either insecure or of unknown security and needs user confirmation

What makes a device secure or not unknown anymore? I have paired with this device multiple times to stream audio. There doesn't seem to be a place where "user confirmation" is possible. Anyone knows how this is implemented?

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