Hi
sorry, I’ve not encountered the device which requires PIN since it is obsolete after SSP support in Bluetooth 2.1.
I recommend to use bluetoothctl command directly to see what is happening if you encounter trouble with bluetooth paring. According to linux - Bluetoothctl set passkey - Stack Overflow, to run agent NoInputNoOutput could let the device change into “Just Works” mode which doesn’t requires PIN. Once you manage to establish the pairing under bluetoothctl, then the device should be automatically connected from next time in volumio as well.
I hope this helps.
Thanks.
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