Flutter_blue: Android Connection Status 133 - Cannot Connect

[bretmh]

I've been having this issue with specifically android devices. iOS works perfectly fine and i've tried to change {autoConnect} to false as others have tried.

I've been testing with a MotoG3 and MotoX.

Here is my code for the connection and scan. Note this code works perfectly fine for iOS..

Error

I/flutter ( 7378): Trying to connect....
D/BluetoothManager( 7378): getConnectedDevices
D/BluetoothGatt( 7378): connect() - device: 0C:2A:69:11:33:30, auto: false
D/BluetoothGatt( 7378): registerApp()
D/BluetoothGatt( 7378): registerApp() - UUID=665b1de4-43d0-4153-9152-6612bfc0291a
D/BluetoothGatt( 7378): onClientRegistered() - status=0 clientIf=5
D/BluetoothGatt( 7378): onClientConnectionState() - status=133 clientIf=5 device=0C:2A:69:11:33:30
D/FlutterBluePlugin( 7378): [onConnectionStateChange] status: 133 newState: 0
I/flutter ( 7378): Not Connected

Start Scan

 _startScan() {
    _scanSubscription = _flutterBlue
        .scan(
      timeout: const Duration(seconds: 5),
    )
        .listen((scanResult) {
      if (scanResult.advertisementData.localName.toString() == "mydevice") {
        print('Device Name: ${scanResult.advertisementData.localName}');
        print('Connectable: ${scanResult.advertisementData.connectable}');
        print('Service UUIDs: ${scanResult.advertisementData.serviceUuids}');
        setState(() {
          scanResults[scanResult.device.id] = scanResult;
        });
      }
    }, onDone: _stopScan);

    setState(() {
      isScanning = true;
    });
  }

Connect

  _connect(BluetoothDevice d) async {
    print("Trying to connect....");

    device = d;

    deviceConnection =
        _flutterBlue.connect(device, autoConnect: false).listen((s) {
      if (s == BluetoothDeviceState.connected) {
        print("Connected");

        setState(() {
          //since we're connected update state
          deviceState = s;

          //Subscribe to Device State Changes.
          deviceStateSubscription = device.onStateChanged().listen((s) {
            setState(() {
              deviceState = s;
            });
          });
          print("Subscribed to Connection State Changes.");

          //Discover device services.
          device.discoverServices().then((s) {
            setState(() {
              print("Services discovered");
              services = s;
            });
          });
        });
      } else {
        print("Not Connected");
      }
    });
  }

[jthansen]

I am having the same issue. It works perfectly on iOS and then I am unable to get scan results on android using Pixel XL.

[jthansen]

My issue was that even though location was enabled in the specific App permissions, it was not "on" under Security & location. Now it's working perfectly.

[bretmh]

My issue was that even though location was enabled in the specific App permissions, it was not "on" under Security & location. Now it's working perfectly.

Could you possibly share your code? I'm particularly having an issue on connection. Haven't had the time to mess with it. I feel like I'm missing something obvious.

[jthansen]

Your connect method works fine with the Flutter Blue example so I'm not sure what's going on. And your scanning works fine? You're able to find your device? Do you need toString() with localName?

[bretmh]

Your connect method works fine with the Flutter Blue example so I'm not sure what's going on. And your scanning works fine? You're able to find your device? Do you need toString() with localName?

I can find my devices on both android and ios. But it's my connecting that I get an issue with. Yes you are right I don't need toString.

[bretmh]

Updated my primary post with my error code. I thought I had it up there.

I/flutter ( 7378): Trying to connect....
D/BluetoothManager( 7378): getConnectedDevices
D/BluetoothGatt( 7378): connect() - device: 0C:2A:69:11:33:30, auto: false
D/BluetoothGatt( 7378): registerApp()
D/BluetoothGatt( 7378): registerApp() - UUID=665b1de4-43d0-4153-9152-6612bfc0291a
D/BluetoothGatt( 7378): onClientRegistered() - status=0 clientIf=5
D/BluetoothGatt( 7378): onClientConnectionState() - status=133 clientIf=5 device=0C:2A:69:11:33:30
D/FlutterBluePlugin( 7378): [onConnectionStateChange] status: 133 newState: 0
I/flutter ( 7378): Not Connected

[lcrocker]

I fixed my status 133 errors after reading:

https://stackoverflow.com/questions/25330938/android-bluetoothgatt-status-133-register-callback

FlutterBluePlugin.java, line 214, change:

BluetoothGatt gattServer = device.connectGatt(registrar.activity(), options.getAndroidAutoConnect(), mGattCallback);

to

BluetoothGatt gattServer = device.connectGatt(registrar.activity(), options.getAndroidAutoConnect(), mGattCallback, BluetoothDevice.TRANSPORT_LE);

[mainini]

PR #229 fixes this...

[pauldemarco]

I can confirm PR #229 did resolve this issue with an LG G6.

Please re-open if you are experiencing this after trying the fix, and supply the phone model you are using.