Fix

app/Http/Controllers/Callback/LinkosCallbackController.php

@@ -17,6 +17,11 @@ class LinkosCallbackController extends Controller
                 case 'online_state_change':
                     $this->handleDeviceStateNotify($request);
                     break;
+
+                default:
+                    if ($request->filled('device_id')) {
+                        Device::where('sn', $request->input('device_id'))->update(['status' => Device::STATE_ONLINE]);
+                    }
             }
         }