蓝牙连接

     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 >= -80
        Watcher.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 advertisements
        Watcher.Received += OnAdvertisementReceived;

        // wait 5 seconds to make sure the device is really out of range
        Watcher.SignalStrengthFilter.OutOfRangeTimeout = TimeSpan.FromMilliseconds(5000);
        Watcher.SignalStrengthFilter.SamplingInterval = TimeSpan.FromMilliseconds(2000);

        // starting watching for advertisements
        Watcher.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 == AsyncStatus.Completed)
                {
                    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 == AsyncStatus.Completed)
           {
               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 == AsyncStatus.Completed)
            {
                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;
        }
        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 == AsyncStatus.Completed)
            {
                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 == AsyncStatus.Completed)
            {
                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 == AsyncStatus.Completed)
               {
                   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 == AsyncStatus.Completed)
           {
               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);
    }

}


 class Progame
{
    private static BleCore bleCore = null;
    
    private static List<GattCharacteristic> characteristics = new List<GattCharacteristic>();

    public static void Main(string[] args)
    {
        bleCore = new BleCore();
        bleCore.DeviceWatcherChanged += DeviceWatcherChanged;
        bleCore.CharacteristicAdded += CharacteristicAdded;
        bleCore.CharacteristicFinish += CharacteristicFinish;
        bleCore.Recdate += Recdata;
        bleCore.StartBleDeviceWatcher();

        Console.ReadKey(true);

        bleCore.Dispose();
        bleCore = null;
    }

    private static void CharacteristicFinish(int size)
    {
        if (size <= 0)
        {
            Console.WriteLine("设备未连上");
            return;
        }
    }

    private static void Recdata(GattCharacteristic sender, byte[] data)
    {
        string str = BitConverter.ToString(data);
        Console.WriteLine(sender.Uuid + "             " + str);
    }

    private static void CharacteristicAdded(GattCharacteristic gatt)
    {
        Console.WriteLine(
            "handle:[0x{0}]  char properties:[{1}]  UUID:[{2}]",
            gatt.AttributeHandle.ToString("X4"),
            gatt.CharacteristicProperties.ToString(),
            gatt.Uuid);
        characteristics.Add(gatt);
    }

    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);
    }

    private static void ConnectDevice(BluetoothLEDevice Device)
    {
        characteristics.Clear();
        bleCore.StopBleDeviceWatcher();
        bleCore.StartMatching(Device);
        bleCore.FindService();
    }
}