BLE GATT 在连接后有时会断开连接并出现异常“GattCallback 错误:xamarin 形式的 133" [英] BLE GATT getting disconnected sometimes after connection with exception 'GattCallback error: 133' in xamarin forms

问题描述

我正在以 Xamarin 形式实现 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.这是我得到的例外

I'm implementing BLE in Xamarin forms. I'm able to do all the BLE operation read, write and notification. But sometimes the device gets disconnected after connection. This is the exception I get

Plugin.BLE.Abstractions.Exceptions.DeviceConnectionException:GattCallback 错误:133"

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?

I'm not getting any solution for this from Xamarin side. Any suggestion?

推荐答案

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

I resolved it by specifying the transport type to the ConnectToDeviceAsync method like this:

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

有时我还是会遇到这个问题，所以我检查了 Play 商店中的 BLE 资源管理器应用，发现问题出在广告客户身上.

still I got this issue sometimes so I checked the BLE explorer app in play store and found that issue is with the advertiser.

这篇关于BLE GATT 在连接后有时会断开连接并出现异常“GattCallback 错误:xamarin 形式的 133"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！