christoph@christoph-dell:/usr/lib$ sudo service bluetooth status
● bluetooth.service - Bluetooth service
   Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
   Active: active (running) since So 2018-08-12 16:10:54 CEST; 22min ago
     Docs: man:bluetoothd(8)
 Main PID: 772 (bluetoothd)
   Status: "Running"
   CGroup: /system.slice/bluetooth.service
           └─772 /usr/lib/bluetooth/bluetoothd

Aug 12 16:11:18 christoph-dell bluetoothd[772]: Endpoint unregistered: sender=:1.41 path=/MediaEndpoint/A2DPSink
Aug 12 16:32:37 christoph-dell bluetoothd[772]: Unable to register GATT service with handle 0x0001 for device 2C:41:A1:C8:FE:06
Aug 12 16:32:37 christoph-dell bluetoothd[772]: Unable to register GATT service with handle 0x000d for device 2C:41:A1:C8:FE:06
Aug 12 16:32:37 christoph-dell bluetoothd[772]: Unable to register GATT service with handle 0x0016 for device 2C:41:A1:C8:FE:06
Aug 12 16:32:37 christoph-dell bluetoothd[772]: Unable to register GATT service with handle 0x002c for device 2C:41:A1:C8:FE:06
Aug 12 16:33:02 christoph-dell bluetoothd[772]: Device is already marked as connected
Aug 12 16:33:02 christoph-dell bluetoothd[772]: Unable to register GATT service with handle 0x0001 for device 2C:41:A1:C8:FE:06
Aug 12 16:33:02 christoph-dell bluetoothd[772]: Unable to register GATT service with handle 0x000d for device 2C:41:A1:C8:FE:06
Aug 12 16:33:02 christoph-dell bluetoothd[772]: Unable to register GATT service with handle 0x0016 for device 2C:41:A1:C8:FE:06
Aug 12 16:33:02 christoph-dell bluetoothd[772]: Unable to register GATT service with handle 0x002c for device 2C:41:A1:C8:FE:06