/var/log/syslog
terá avisos sobre o bluetooth.
/var/log$ grep blue syslog.1|more
mostra entre outros ...
Mar 12 17:47:36 schijfwereld bluetoothd[894]: DIS cannot start: GATT is disabled Mar 12 17:47:36 schijfwereld bluetoothd[894]: Failed to init deviceinfo plugin Mar 12 17:47:36 schijfwereld bluetoothd[894]: Failed to init proximity plugin Mar 12 17:47:36 schijfwereld bluetoothd[894]: Failed to init time plugin Mar 12 17:47:36 schijfwereld bluetoothd[894]: Failed to init alert plugin Mar 12 17:47:36 schijfwereld bluetoothd[894]: Failed to init thermometer plugin Mar 12 17:47:36 schijfwereld bluetoothd[894]: Failed to init gatt_example plugin Mar 12 17:47:36 schijfwereld bluetoothd[894]: Bluetooth Management interface ini tialized Mar 12 18:38:23 schijfwereld bluetoothd[862]: Failed to init gatt_example plugin
Se você fizer um
tail -f /var/log/syslog
e habilitar / desabilitar o bluetooth ele irá iniciar listando os comandos quando eles forem inseridos no syslog para que você possa monitorar este arquivo em tempo real.