Question

我正在使用运行最新稳定Windows IoT核心版（v.10.0.17763.737）的RaspberryPis（v3）来检索数据并控制我的蓝牙恒温器。我在蓝牙连接的稳定性上苦苦挣扎了很长时间。几个月前，我将所有节点切换到外部加密狗（来自Microsoft兼容性列表的一个加密狗：ORICO BTA-403），这可以改善这种情况，但距离稳定还很遥远。

一段时间（从几分钟到几天不等）后，蓝牙连接将停止工作。我已经实现了一个powershell脚本来检查这种情况并触发“ devcon restart USB ”命令。这有帮助，但仅占所有故障的50％。如果不能解决问题，则必须重新启动节点。但是，这并不令人满意，因为引导时会不时冻结节点，而我的经验是过多的重新引导会缩短micro sd卡的寿命。

经过几个小时的分析，我发现蓝牙支持服务可能是问题所在。在连接崩溃之前，我可以使用powershell轻松重启蓝牙支持服务。发生问题后，这将不再可能。服务重新启动挂起，并且服务的状态表明它正在等待重新启动或类似的操作。

你们也有同样的经历吗？还是我的蓝牙连接实现太差了？我附上了该功能供您查看：

private async Task Connect()
    {
        try
        {
            int count = 0;
            do
            {
                count++;
                if (count > 10)
                {
                    m_IsInitialized = false;
                    //throw new Exception("More than 10 tries have not been successfull for connecting with thermostat module. Stopping.");
                }
                m_IsInitialized = false;

                m_Device = await BluetoothLEDevice.FromIdAsync(m_DeviceID);
                if (m_Device == null)
                {
                    throw new Exception("Device was not found.");
                }

                m_Characteristics = new Dictionary<ushort, GattCharacteristic>();
                GattDeviceServicesResult gattServices = await m_Device.GetGattServicesAsync();
                foreach (GattDeviceService service in gattServices.Services)
                {
                    try
                    {
                        GattCharacteristicsResult characteristicsResult = await service.GetCharacteristicsAsync();
                        IReadOnlyList<GattCharacteristic> characteristics = characteristicsResult.Characteristics;
                        foreach (GattCharacteristic characteristic in characteristics)
                        {
                            try
                            {
                                m_Characteristics.Add(characteristic.AttributeHandle, characteristic);
                                GattCharacteristicProperties properties = characteristic.CharacteristicProperties;
                                if (properties.HasFlag(GattCharacteristicProperties.Notify))
                                {
                                    try
                                    {
                                        GattCommunicationStatus status = await characteristic.WriteClientCharacteristicConfigurationDescriptorAsync(GattClientCharacteristicConfigurationDescriptorValue.Notify);
                                        if (status == GattCommunicationStatus.Success)
                                        {
                                            characteristic.ValueChanged += Characteristic_ValueChanged;
                                            m_IsInitialized = true;
                                            //Logger.ServiceLog(string.Format("Thermostat has been initialized successfully ({0} tries).", count));
                                            return;
                                        }
                                    }
                                    catch (Exception ex4)
                                    {
                                        throw new Exception("4: GattCommunicationStatus: " + ex4.Message + "\nStackTrace: " + ex4.StackTrace);
                                    }
                                }
                            }
                            catch (Exception ex3)
                            {
                                throw new Exception("3: GattCharacteristic: " + ex3.Message + "\nStackTrace: " + ex3.StackTrace);
                            }
                        }
                    }
                    catch (Exception ex2)
                    {
                        throw new Exception("2: GattDeviceService: " + ex2.Message + "\nStackTrace: " + ex2.StackTrace);
                    }
                }
                //Logger.ServiceLog(string.Format("Thermostat:Connect: Unsuccessful try: {0}", count));
                await Task.Delay(1 * 60 * 1000);
            }
            while (!m_IsInitialized);
        }
        catch (Exception ex)
        {
            Logger.ServiceLog("1: Thermostat.cs Connect", ex);
        }
    }

如您所见，该代码充满了调试帮助，但是当连接崩溃时根本没有引发异常。我真的很期待任何帮助，因为经过数月的奋斗，我真的希望获得一个稳定的解决方案，而没有任何黑客或变通办法。

感谢您的帮助：-）

Windows IoT核心版上的蓝牙连接不稳定-甚至使用外部加密狗

0 个答案: