Add state check before discoverServices is called. (pauldemarco#537)

DreamLCM · Apr 8, 2020 · b5d4289 · b5d4289
1 parent df44e5c
commit b5d4289
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/lib/src/bluetooth_device.dart b/lib/src/bluetooth_device.dart
@@ -53,6 +53,11 @@ class BluetoothDevice {
 
   /// Discovers services offered by the remote device as well as their characteristics and descriptors
   Future<List<BluetoothService>> discoverServices() async {
+    final s = await state.first;
+    if (s != BluetoothDeviceState.connected) {
+      return Future.error(new Exception(
+          'Cannot discoverServices while device is not connected. State == $s'));
+    }
     var response = FlutterBlue.instance._methodStream
         .where((m) => m.method == "DiscoverServicesResult")
         .map((m) => m.arguments)