The dongle beacon carries a pairing flag in the Microsoft OUI IE; with
it clear, controllers ignore the beacon. Port xone_dongle_toggle_pairing:
xone_set_pairing() rewrites the beacon with the flag set and blinks the
LED, the GUI button triggers it, EVT_BUTTON (dongle button) does too, and
the LED follows upstream state (blink while pairing, on when a controller
is connected, off otherwise). The CLI gains a pair command.
Log every inbound frame (info word + first 16 bytes) so the RX path can
be traced against hardware.
Co-Authored-By: qwen3.8-27b@q2_k_xl: pairing mode and RX logging
portersky
5fd1b3a11f