Is it possible to log/monitor Bluetooth errors?

/var/log/syslog

will have notices regarding bluetooth.

grep blue /var/log/syslog.1|more

shows amongst others ...

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

If you do a

tail -f /var/log/syslog

and enable/disble bluetooth it will start listing commands when they are inserted into syslog so you can monitor this file in real time.