Windows 10 Mobile（UWP）藍牙開發

之前在做比賽時遇到了這個問題，需要使用UWP連接藍牙設備接收數據，官方文檔上面的使用PeerFinder，然後用await streamSocket.ConnectAsync(info.HostName, “1”);連接，總是出現值不在範圍內，最後終於被我找到了解決方案
我們可以用搜索所有設備過濾出藍牙設備的方法：

var devices = await Windows.Devices.Enumeration.DeviceInformation.FindAllAsync(GattDeviceService.GetDeviceSelectorFromUuid(GattServiceUuids.GenericAccess));

var service = await GattDeviceService.FromIdAsync(devices[0].Id);

serviceUUID出來後可以自己找特徵值。

具體代碼如下：

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading.Tasks;
using Windows.Devices.Bluetooth;
using Windows.Devices.Bluetooth.GenericAttributeProfile;
using Windows.Devices.Enumeration;
using Windows.Foundation;
using Windows.Networking;
using Windows.Networking.Proximity;
using Windows.Networking.Sockets;
using Windows.Storage.Streams;
using Windows.UI.Core;
using Windows.UI.Popups;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;

// “空白頁”項模板在 http://go.microsoft.com/fwlink/?LinkId=234238 上提供

namespace MyApp
{
    /// <summary>
    /// 可用於自身或導航至 Frame 內部的空白頁。
    /// </summary>
    public sealed partial class BindDevicePage : Page
    {
        public BindDevicePage()
        {
            this.InitializeComponent();

            if (App.IsHardwareButtonsAPIPresent)
            {
                btn_back.Visibility = Visibility.Collapsed;
            }
            else
            {
                btn_back.Visibility = Visibility.Visible;
            }
        }

        protected override async void OnNavigatedTo(NavigationEventArgs e)
        {
            await ScanDevice();
        }

        private async void ABB_Refresh_OnClicked(object sender, RoutedEventArgs e)
        {
            await ScanDevice();
        }

        private async void ABB_Accept_OnClicked(object sender, RoutedEventArgs e)
        {
            try
            {
                if (await ConnectToDevice() == false)
                    return;
                if (await FindService() == false)
                    return;
                if (await FindCharacteristic() == false)
                    return;
                getValue();
            }
            catch (Exception exc)
            {
                Debug.WriteLine("BindDevicePage ABB_Accept_OnClicked: " + exc.Message);
            }

            MessageDialog dialog = new MessageDialog("Bind Device successfully!");
            dialog.Commands.Add(new UICommand("OK", cmd => { }, commandId: 0));
            IUICommand result = await dialog.ShowAsync();
            if ((int)result.Id == 0)
            {
                if (this.Frame.CanGoBack)
                {
                    this.Frame.GoBack();
                }
            }
        }

        DeviceInformationCollection bleDevices;
        BluetoothLEDevice _device;
        IReadOnlyList<GattDeviceService> _services;
        GattDeviceService _service;
        GattCharacteristic _characteristic;

        public string str;
        bool _notificationRegistered;
        private async Task<int> ScanDevice()
        {
            try
            {
                //查找所有設備
                bleDevices = await DeviceInformation.FindAllAsync(BluetoothLEDevice.GetDeviceSelector());

                Debug.WriteLine("Found " + bleDevices.Count + " device(s)");

                if (bleDevices.Count == 0)
                {
                    await new MessageDialog("No BLE Devices found - make sure you've paired your device").ShowAsync();
                    //跳轉到藍牙設置界面
                    await Windows.System.Launcher.LaunchUriAsync(new Uri("ms-settings-bluetooth:", UriKind.RelativeOrAbsolute));
                }
                deviceList.ItemsSource = bleDevices;
            }
            catch (Exception ex)
            {
                //if((uint)ex.HResult == 0x8007048F)
                //{
                //    await new MessageDialog("Bluetooth is turned off!").ShowAsync();
                //}
                await new MessageDialog("Failed to find BLE devices: " + ex.Message).ShowAsync();
            }

            return bleDevices.Count;
        }
        private async Task<bool> ConnectToDevice()
        {
            try
            {
                for (int i = 0; i < bleDevices.Count; i++)
                {
                    //VICTOR是設備名稱，改成你自己的就行
                    if (bleDevices[i].Name == "VICTOR")
                    {
                        _device = await BluetoothLEDevice.FromIdAsync(bleDevices[i].Id);
                        _services = _device.GattServices;
                        Debug.WriteLine("Found Device: " + _device.Name);
                        return true;
                    }
                }
            }
            catch (Exception ex)
            {
                await new MessageDialog("Connection failed: " + ex.Message).ShowAsync();
                return false;
            }
            await new MessageDialog("Unable to find device VICTOR - has it been paired?").ShowAsync();

            return true;
        }
        private async Task<bool> FindService()
        {
            foreach (GattDeviceService s in _services)
            {
                Debug.WriteLine("Found Service: " + s.Uuid);

                if (s.Uuid == new Guid("0000fff0-0000-1000-8000-00805f9b34fb"))
                {
                    _service = s;
                    return true;
                }
            }
            await new MessageDialog("Unable to find VICTOR Service 0000fff0").ShowAsync();
            return false;
        }
        private async Task<bool> FindCharacteristic()
        {
            foreach (var c in _service.GetCharacteristics(new Guid("0000fff1-0000-1000-8000-00805f9b34fb")))
            {
                //"unauthorized access" without proper permissions
                _characteristic = c;
                Debug.WriteLine("Found characteristic: " + c.Uuid);

                return true;
            }
            //IReadOnlyList<GattCharacteristic> characteristics = _service.GetAllCharacteristics();

            await new MessageDialog("Could not find characteristic or permissions are incorrrect").ShowAsync();
            return false;
        }

        public async void getValue()
        {
            //註冊消息監聽器
            await RegisterNotificationAsync();
            GattReadResult x = await _characteristic.ReadValueAsync();

            if (x.Status == GattCommunicationStatus.Success)
            {
                str = ParseString(x.Value);
                Debug.WriteLine(str);
            }
        }
        public static string ParseString(IBuffer buffer)
        {
            DataReader reader = DataReader.FromBuffer(buffer);
            return reader.ReadString(buffer.Length);
        }
        //接受藍牙數據並校驗進行上傳
        public async void CharacteristicValueChanged_Handler(GattCharacteristic sender, GattValueChangedEventArgs obj)
        {
            str = ParseString(obj.CharacteristicValue);
            Debug.WriteLine(str);
            //TODO str就是藍牙數據，你可以做自己想做的了
        }
        public async Task RegisterNotificationAsync()
        {
            if (_notificationRegistered)
            {
                return;
            }
            GattCommunicationStatus writeResult;
            if (((_characteristic.CharacteristicProperties & GattCharacteristicProperties.Notify) != 0))
            {

                _characteristic.ValueChanged +=
                    new TypedEventHandler<GattCharacteristic, GattValueChangedEventArgs>(CharacteristicValueChanged_Handler);
                writeResult = await _characteristic.WriteClientCharacteristicConfigurationDescriptorAsync(
                    GattClientCharacteristicConfigurationDescriptorValue.Notify);
                _notificationRegistered = true;
            }
        }

        private async void ABB_Bluetooth_OnClicked(object sender, RoutedEventArgs e)
        {
            await Windows.System.Launcher.LaunchUriAsync(new Uri("ms-settings-bluetooth:"));
        }

        private void btn_back_onClicked(object sender, RoutedEventArgs e)
        {
            if (this.Frame.CanGoBack)
            {
                this.Frame.GoBack();
            }
        }
    }
}