这里用自带的windows蓝牙连接库去处理连接问题，下面是代码：
using System;using System.Collections.Generic;using Windows.Devices.Bluetooth;using Windows.Devices.Bluetooth.Advertisement;using Windows.Devices.Bluetooth.GenericAttributeProfile;using Windows.Foundation;using Windows.Security.Cryptography;namespace WitBLE{class BleCore{private bool asyncLock = false;/// <summary>/// 当前连接的服务/// </summary>public GattDeviceService CurrentService { get; private set; }/// <summary>/// 当前连接的蓝牙设备/// </summary>public BluetoothLEDevice CurrentDevice { get; private set; }/// <summary>/// 写特征对象/// </summary>public GattCharacteristic CurrentWriteCharacteristic { get; private set; }/// <summary>/// 通知特征对象/// </summary>public GattCharacteristic CurrentNotifyCharacteristic { get; private set; }/// <summary>/// 存储检测到的设备/// </summary>public List<BluetoothLEDevice> DeviceList { get; private set; }/// <summary>/// 特性通知类型通知启用/// </summary>private const GattClientCharacteristicConfigurationDescriptorValue CHARACTERISTIC_NOTIFICATION_TYPE = GattClientCharacteristicConfigurationDescriptorValue.Notify;/// <summary>/// 定义搜索蓝牙设备委托/// </summary>public delegate void DeviceWatcherChangedEvent(BluetoothLEDevice bluetoothLEDevice);/// <summary>/// 搜索蓝牙事件/// </summary>public event DeviceWatcherChangedEvent DeviceWatcherChanged;/// <summary>/// 获取服务委托/// </summary>public delegate void CharacteristicFinishEvent(int size);/// <summary>/// 获取服务事件/// </summary>public event CharacteristicFinishEvent CharacteristicFinish;/// <summary>/// 获取特征委托/// </summary>public delegate void CharacteristicAddedEvent(GattCharacteristic gattCharacteristic);/// <summary>/// 获取特征事件/// </summary>public event CharacteristicAddedEvent CharacteristicAdded;/// <summary>/// 接受数据委托/// </summary>/// <param name="sender"></param>/// <param name="data"></param>public delegate void RecDataEvent(GattCharacteristic sender, byte[] data);/// <summary>/// 接受数据事件/// </summary>public event RecDataEvent Recdate;/// <summary>/// 当前连接的蓝牙Mac/// </summary>private string CurrentDeviceMAC { get; set; }private BluetoothLEAdvertisementWatcher Watcher = null;public BleCore(){DeviceList = new List<BluetoothLEDevice>();}/// <summary>/// 搜索蓝牙设备/// </summary>public void StartBleDeviceWatcher(){Watcher = new BluetoothLEAdvertisementWatcher();Watcher.ScanningMode = BluetoothLEScanningMode.Active;// only activate the watcher when we're recieving values >= -80Watcher.SignalStrengthFilter.InRangeThresholdInDBm = -80;// stop watching if the value drops below -90 (user walked away)Watcher.SignalStrengthFilter.OutOfRangeThresholdInDBm = -90;// register callback for when we see an advertisementsWatcher.Received += OnAdvertisementReceived;// wait 5 seconds to make sure the device is really out of rangeWatcher.SignalStrengthFilter.OutOfRangeTimeout = TimeSpan.FromMilliseconds(5000);Watcher.SignalStrengthFilter.SamplingInterval = TimeSpan.FromMilliseconds(2000);// starting watching for advertisementsWatcher.Start();Console.WriteLine("自动发现设备中..");}/// <summary>/// 停止搜索蓝牙/// </summary>public void StopBleDeviceWatcher(){if (Watcher != null)this.Watcher.Stop();}/// <summary>/// 主动断开连接/// </summary>/// <returns></returns>public void Dispose(){CurrentDeviceMAC = null;CurrentService?.Dispose();CurrentDevice?.Dispose();CurrentDevice = null;CurrentService = null;CurrentWriteCharacteristic = null;CurrentNotifyCharacteristic = null;Console.WriteLine("主动断开连接");}/// <summary>/// 匹配/// </summary>/// <param name="Device"></param>public void StartMatching(BluetoothLEDevice Device){this.CurrentDevice = Device;}/// <summary>/// 发送数据接口/// </summary>/// <returns></returns>public void Write(byte[] data){if (CurrentWriteCharacteristic != null){CurrentWriteCharacteristic.WriteValueAsync(CryptographicBuffer.CreateFromByteArray(data), GattWriteOption.WriteWithResponse).Completed = (asyncInfo, asyncStatus) =>{if (asyncStatus == pleted){GattCommunicationStatus a = asyncInfo.GetResults();Console.WriteLine("发送数据：" + BitConverter.ToString(data) + " State : " + a);}};}}/// 获取蓝牙服务/// </summary>public void FindService(){this.CurrentDevice.GetGattServicesAsync().Completed = (asyncInfo, asyncStatus) =>{if (asyncStatus == pleted){var services = asyncInfo.GetResults().Services;Console.WriteLine("GattServices size=" + services.Count);foreach (GattDeviceService ser in services){FindCharacteristic(ser);}CharacteristicFinish?.Invoke(services.Count);}};}/// <summary>/// 按MAC地址直接组装设备ID查找设备/// </summary>public void SelectDeviceFromIdAsync(string MAC){CurrentDeviceMAC = MAC;CurrentDevice = null;BluetoothAdapter.GetDefaultAsync().Completed = (asyncInfo, asyncStatus) =>{if (asyncStatus == pleted){BluetoothAdapter mBluetoothAdapter = asyncInfo.GetResults();byte[] _Bytes1 = BitConverter.GetBytes(mBluetoothAdapter.BluetoothAddress);//ulong转换为byte数组Array.Reverse(_Bytes1);string macAddress = BitConverter.ToString(_Bytes1, 2, 6).Replace('-', ':').ToLower();string Id = "BluetoothLE#BluetoothLE" + macAddress + "-" + MAC;Matching(Id);}};}/// <summary>/// 获取操作/// </summary>/// <returns></returns>public void SetOpteron(GattCharacteristic gattCharacteristic){byte[] _Bytes1 = BitConverter.GetBytes(this.CurrentDevice.BluetoothAddress);Array.Reverse(_Bytes1);this.CurrentDeviceMAC = BitConverter.ToString(_Bytes1, 2, 6).Replace('-', ':').ToLower();string msg = "正在连接设备<" + this.CurrentDeviceMAC + ">..";Console.WriteLine(msg);if (gattCharacteristic.CharacteristicProperties == GattCharacteristicProperties.Write){this.CurrentWriteCharacteristic = gattCharacteristic;}if (gattCharacteristic.CharacteristicProperties == GattCharacteristicProperties.Notify){this.CurrentNotifyCharacteristic = gattCharacteristic;this.CurrentNotifyCharacteristic.ProtectionLevel = GattProtectionLevel.Plain;this.CurrentNotifyCharacteristic.ValueChanged += Characteristic_ValueChanged;this.EnableNotifications(CurrentNotifyCharacteristic);}if ((uint)gattCharacteristic.CharacteristicProperties == 26){}if (gattCharacteristic.CharacteristicProperties == (GattCharacteristicProperties.Write | GattCharacteristicProperties.Notify)){this.CurrentWriteCharacteristic = gattCharacteristic;this.CurrentNotifyCharacteristic = gattCharacteristic;this.CurrentNotifyCharacteristic.ProtectionLevel = GattProtectionLevel.Plain;this.CurrentNotifyCharacteristic.ValueChanged += Characteristic_ValueChanged;this.CurrentDevice.ConnectionStatusChanged += this.CurrentDevice_ConnectionStatusChanged;this.EnableNotifications(CurrentNotifyCharacteristic);}}private void OnAdvertisementReceived(BluetoothLEAdvertisementWatcher watcher, BluetoothLEAdvertisementReceivedEventArgs eventArgs){BluetoothLEDevice.FromBluetoothAddressAsync(eventArgs.BluetoothAddress).Completed = (asyncInfo, asyncStatus) =>{if (asyncStatus == pleted){if (asyncInfo.GetResults() == null){Console.WriteLine("没有得到结果集");}else{BluetoothLEDevice currentDevice = asyncInfo.GetResults();if (DeviceList.FindIndex((x) => { return x.Name.Equals(currentDevice.Name); }) < 0){this.DeviceList.Add(currentDevice);DeviceWatcherChanged?.Invoke(currentDevice);}}}};}/// <summary>/// 获取特性/// </summary>private void FindCharacteristic(GattDeviceService gattDeviceService){this.CurrentService = gattDeviceService;this.CurrentService.GetCharacteristicsAsync().Completed = (asyncInfo, asyncStatus) =>{if (asyncStatus == pleted){var services = asyncInfo.GetResults().Characteristics;foreach (var c in services){this.CharacteristicAdded?.Invoke(c);}}};}/// <summary>/// 搜索到的蓝牙设备/// </summary>/// <returns></returns>private void Matching(string Id){try{BluetoothLEDevice.FromIdAsync(Id).Completed = (asyncInfo, asyncStatus) =>{if (asyncStatus == pleted){BluetoothLEDevice bleDevice = asyncInfo.GetResults();this.DeviceList.Add(bleDevice);Console.WriteLine(bleDevice);}if (asyncStatus == AsyncStatus.Started){Console.WriteLine(asyncStatus.ToString());}if (asyncStatus == AsyncStatus.Canceled){Console.WriteLine(asyncStatus.ToString());}if (asyncStatus == AsyncStatus.Error){Console.WriteLine(asyncStatus.ToString());}};}catch (Exception e){string msg = "没有发现设备" + e.ToString();Console.WriteLine(msg);this.StartBleDeviceWatcher();}}private void CurrentDevice_ConnectionStatusChanged(BluetoothLEDevice sender, object args){if (sender.ConnectionStatus == BluetoothConnectionStatus.Disconnected && CurrentDeviceMAC != null){if (!asyncLock){asyncLock = true;Console.WriteLine("设备已断开");//this.CurrentDevice?.Dispose();//this.CurrentDevice = null;//CurrentService = null;//CurrentWriteCharacteristic = null;//CurrentNotifyCharacteristic = null;//SelectDeviceFromIdAsync(CurrentDeviceMAC);}}else{if (!asyncLock){asyncLock = true;Console.WriteLine("设备已连接");}}}/// <summary>/// 设置特征对象为接收通知对象/// </summary>/// <param name="characteristic"></param>/// <returns></returns>private void EnableNotifications(GattCharacteristic characteristic){Console.WriteLine("收通知对象=" + CurrentDevice.Name + ":" + CurrentDevice.ConnectionStatus);characteristic.WriteClientCharacteristicConfigurationDescriptorAsync(CHARACTERISTIC_NOTIFICATION_TYPE).Completed = (asyncInfo, asyncStatus) =>{if (asyncStatus == pleted){GattCommunicationStatus status = asyncInfo.GetResults();if (status == GattCommunicationStatus.Unreachable){Console.WriteLine("设备不可用");if (CurrentNotifyCharacteristic != null && !asyncLock){this.EnableNotifications(CurrentNotifyCharacteristic);}return;}asyncLock = false;Console.WriteLine("设备连接状态" + status);}};}/// <summary>/// 接受到蓝牙数据/// </summary>private void Characteristic_ValueChanged(GattCharacteristic sender, GattValueChangedEventArgs args){byte[] data;CryptographicBuffer.CopyToByteArray(args.CharacteristicValue, out data);//Recdate?.Invoke(sender, data);string byteResult = BitConverter.ToString(data);DealCallDatas(byteResult);}/// <summary>/// 处理回调的数据/// </summary>/// <param name="data"></param>private void DealCallDatas(string data){//返回的数据形式如：55-61-CD-FC-7D-FD-15-07-EA-FF-D4-FF-CA-FF-4B-F1-BD-0F-3D-12//这里解析的数据依次为：//数据包头[0]-标志位[1]//-X轴加速度低8位[2]-X轴加速度高8位[3]//-Y轴加速度低8位[4]-Y轴加速度高8位[5]//-Z轴加速度低8位[6]-Z轴加速度高8位[7]//-X轴角速度低8位[8]-X轴角速度高8位[9]//-Y轴角速度低8位[10]-Y轴角速度高8位[11]//-Z轴角速度低8位[12]-Z轴角速度高8位[13]//-X轴角度低8位[14]-X轴角度高8位[15]//-Y轴角度低8位[16]-Y轴角度高8位[17]//-Z轴角度低8位[18]-Z轴角度高8位[19]string[] list = data.Split('-');if (list.Length > 1){double AxH = Convert.ToInt32(list[3], 16); //加速度X高8位int AxL = Convert.ToInt32(list[2], 16); //加速度X低8位float Ax = (float)((short)((short)AxH << 8 | AxL) / 32768.0 * 16.0); //加速度X=((AxH<<8)|AxL)/32768*16g//以下是Y和Z的，方法同上double AyH = Convert.ToInt32(list[5], 16);int AyL = Convert.ToInt32(list[4], 16);float Ay = (float)((short)((short)AyH << 8 | AyL) / 32768.0 * 16.0);double AzH = Convert.ToInt32(list[7], 16);int AzL = Convert.ToInt32(list[6], 16);float Az = (float)((short)((short)AzH << 8 | AzL) / 32768.0 * 16.0);string text = "加速度： X:" + Ax.ToString("N2") + "g Y:" + Ay.ToString("N2") + "g Z:" + Az.ToString("N2") + "g";//角速度和角度方法雷同，这里省略//角速度X=((AxH<<8)|AxL)/32768*2000°/s//角度X=((AxH<<8)|AxL)/32768*180°Console.WriteLine(text);}}}}
搜索并连接设备：
private static void DeviceWatcherChanged(BluetoothLEDevice currentDevice){byte[] _Bytes1 = BitConverter.GetBytes(currentDevice.BluetoothAddress);Array.Reverse(_Bytes1);string address = BitConverter.ToString(_Bytes1, 2, 6).Replace('-', ':').ToLower();Console.WriteLine("发现设备：<" + currentDevice.Name + "> address:<" + address + ">");//指定一个对象，使用下面方法去连接设备//ConnectDevice(currentDevice);//根据蓝牙设备名称或者蓝牙MAC地址读取设备if (currentDevice.Name.Equals("WT901BLE67") || currentDevice.DeviceId.Contains("d0:3e:7d:a4:7a:cc")){ConnectDevice(currentDevice);//根据特征码获取数据GattCharacteristic gattCharacteristic = characteristics.Find((x) => { return x.Uuid.Equals(new Guid("0000ffe4-0000-1000-8000-00805f9a34fb")); });bleCore.SetOpteron(gattCharacteristic);}}
bleCore = new BleCore();bleCore.DeviceWatcherChanged += DeviceWatcherChanged;bleCore.CharacteristicAdded += CharacteristicAdded;bleCore.CharacteristicFinish += CharacteristicFinish;bleCore.Recdate += Recdata;bleCore.StartBleDeviceWatcher();
如果是连接多设备，OnAdvertisementReceived改成如下：
private void OnAdvertisementReceived(BluetoothLEAdvertisementWatcher watcher, BluetoothLEAdvertisementReceivedEventArgs eventArgs){BluetoothLEDevice.FromBluetoothAddressAsync(eventArgs.BluetoothAddress).Completed = (asyncInfo, asyncStatus) =>{if (asyncStatus == pleted){if (asyncInfo.GetResults() == null){Console.WriteLine("没有得到结果集");}else{BluetoothLEDevice currentDevice = asyncInfo.GetResults();Boolean contain = false;foreach (BluetoothLEDevice device in DeviceList) //过滤重复的设备{if (device.DeviceId == currentDevice.DeviceId) //设备已存在列表中{contain = true;}}if (!contain){this.DeviceList.Add(currentDevice);DeviceWatcherChanged?.Invoke(currentDevice);}}}};}
官网协议解释：https://wit-/docs/share/a1b38900-24ab-4853-9a00-847b3ec4d39b?#SQh02
