BLE GATT getting disconnected sometimes after connection with exception 'GattCallback error: 133' in xamarin forms

Question

我正在 Xamarin 表单中实现 BLE。我能够执行所有 BLE 操作读取、写入和通知。但有时设备在连接后会断开连接。这是我得到的异常

Plugin.BLE.Abstractions.Exceptions.DeviceConnectionException: 'GattCallback error: 133'

这是我进行连接的代码

 private async Task ScanForDevices(ScanData scanData)
        {
            
            _adapter = CrossBluetoothLE.Current.Adapter;
            _adapter.ScanMode = ScanMode.LowLatency;
            Device.BeginInvokeOnMainThread(async () =>
            {
                _adapter.DeviceDiscovered += async (s, a) =>
            {
                NativeDeviceAdd = DependencyService.Get<INativeDevice>().ConvertToNative(a.Device);
                PropertyInfo propInfo = NativeDeviceAdd.GetType().GetProperty("Name");
                BleDeviceName = (string)propInfo.GetValue(NativeDeviceAdd, null);
               
                string substr = scanData.blename;
                if (BleDeviceName == substr)
                {
                  
                     _device = a.Device;
                   
                   await _adapter.StopScanningForDevicesAsync();
                   await ConnectForDevice(_characteristicsBLE);

                }
            };
            });
            await _adapter.StartScanningForDevicesAsync();
        }


       
        private async Task ConnectForDevice(ICharacteristic characteristics)
        {
           
            await _adapter.ConnectToDeviceAsync(_device);
        }

这些是日志。

01-08 17:31:50.435 D/BluetoothManager(26670): getConnectionState()
01-08 17:31:50.435 D/BluetoothManager(26670): getConnectedDevices
01-08 17:31:50.439 D/BluetoothGatt(26670): connect() - device: 34:C9:F0:8D:F4:57, auto: false
01-08 17:31:50.439 D/BluetoothGatt(26670): registerApp()
01-08 17:31:50.439 D/BluetoothGatt(26670): registerApp() - UUID=84c84faa-46ff-4e02-9f9a-f8d14fed8ed0
01-08 17:31:50.441 D/BluetoothGatt(26670): onClientRegistered() - status=0 clientIf=13
01-08 17:31:51.587 D/BluetoothGatt(26670): onClientConnectionState() - status=133 clientIf=13 device=34:C9:F0:8D:F4:57
01-08 17:31:51.594 D/BluetoothGatt(26670): onClientConnectionState() - status=133 clientIf=12 device=34:C9:F0:8D:F4:57
Thread started:  #10
Thread started:  #11
01-08 17:31:51.680 D/BluetoothGatt(26670): close()
01-08 17:31:51.680 D/BluetoothGatt(26670): close()
01-08 17:31:51.680 D/BluetoothGatt(26670): unregisterApp() - mClientIf=12
01-08 17:31:51.680 D/BluetoothGatt(26670): unregisterApp() - mClientIf=13
**Plugin.BLE.Abstractions.Exceptions.DeviceConnectionException:** 'GattCallback error: 133'

我没有从 Xamarin 方面得到任何解决方案。有什么建议吗？

Answer 1

不幸的是，错误 133 相对常见并且通常与 hardware/stack 有关（特别是如果这种情况发生在 Android 上）。目前还没有明确定义的修复方法（据我所知），但已经提到了一些解决方法，包括尝试静默重新连接或尝试建立联系。查看下面的 link 并搜索“133”以获取有关解决方法的更多信息：-

Ultimate Guide to Android BLE Development

还有一些关于其他用户尝试过的内容的参考：-

GATT Error 133 on onConnectionStateChange
Android 10 with GATT Error 133
GATT Error 133 with Android
Making Android BLE Work
Lessons for Android BLE Developers

Answer 2

我通过为 ConnectToDeviceAsync 方法指定传输类型来解决它，如下所示：

var parameters = new ConnectParameters(forceBleTransport: true);
await _adapter.ConnectToDeviceAsync(deviceToConnect, parameters, cancellationToken.Token);

有时我仍然遇到这个问题，所以我检查了 Play 商店中的 BLE 资源管理器应用程序，发现问题出在广告商身上。

BLE GATT getting disconnected sometimes after connection with exception 'GattCallback error: 133' in xamarin forms

BLE GATT getting disconnected sometimes after connection with exception 'GattCallback error: 133' in xamarin forms

c#

bluetooth-lowenergy

xamarin.forms