shutdown() installs onUnwantedPairing to actively refuse pairing (used on
the factory-reset / BT-disable teardown path), but the correct callback
(onPairingPasskey) is installed only in setup(). Re-enabling BLE on an
already-constructed nrf52Bluetooth goes through resumeAdvertising(), not
setup() (main-nrf52.cpp), which only re-armed advertising and never
restored the pairing callback. So a shutdown()->resumeAdvertising() cycle
without a reboot left the device silently refusing all pairing until the
next reboot.
Restore the correct pairing passkey callback in resumeAdvertising(),
guarded by the same config.bluetooth.mode check setup() uses. Only PIN
modes drive a passkey-display callback; NO_PIN (Just Works) never invokes
it, so no restore is needed there.
Reachable today only via the PowerStress module's BT_OFF/BT_ON opcodes
(normal runtime BT-disable paths reboot), so low severity, but a real
teardown-latches / re-enable-doesn't-restore asymmetry.
Ben Meadors
43084873a6