A rough draft of the bluetooth driver stack support code can be viewed here: https://gitlab.winehq.org/vibhavp/wine/-/tree/vibhavp/winebth?ref_type=heads
The idea is that once merged, `winebth.sys` will call `plugplay_send_event` to send `GUID_BLUETOOTH_RADIO_IN_RANGE` and `GUID_BLUETOOTH_RADIO_OUT_OF_RANGE` events when device discovery is enabled for the underlying radio `HANDLE`.