c# - Windows 接收 iOS 设备发布的 BLE 广播包

Question

我正在尝试使用蓝牙在 Windows 和 iOS 之间进行通信。

在 iOS 端，我正在发布广告，而在 Windows 端，我正在“观看”广告。

目前在收到我的 iOS 设备发布的广告时，这些广告是……空的。没有服务，没有 ManufacturerData，DataSections 列表包含 1 个数据长度为 1(？)的 DataSection 本地名称为空，此广告包中基本上没有任何用处。

当我调用 BluetoothLEDevice.FromBluetoothAddressAsync(蓝牙地址)时，我得到了一个对象，但是当我调用 GetGattService 时，一切都是空的，没有服务，找不到元素异常，DeviceInformation 为空...什么都没有据我所知很有用。

我不知道是我在iOS端发布的广告有问题，还是我在Windows端的处理方式有问题。

这是 iOS 代码:

import Foundation
import CoreBluetooth

class BluetoothController : NSObject, CBPeripheralManagerDelegate {
    var delegate : BluetoothControllerDelegate?
    var manager : CBPeripheralManager?

    init(_ delegate : BluetoothControllerDelegate) {
        super.init()
        manager = CBPeripheralManager(delegate: self, queue: nil)
        self.delegate = delegate

        self.delegate?.statusUpdate("init")
    }

    func peripheralManagerDidUpdateState(_ peripheral: CBPeripheralManager){
        delegate?.statusUpdate("Perepheral did update state : \(peripheral.state)")

        if(peripheral.state == CBManagerState.poweredOn){
            addServices()
        }
    }

    func addServices(){
        let service = CBMutableService(type: CBUUID.init(string: "e1fa36b4-9700-414b-a4e0-382a3e249e56"), primary: true)
 //       service.
        manager?.add(service)
    }

    func peripheralManager(_ peripheral: CBPeripheralManager, didAdd service: CBService, error: Error?){
        delegate?.statusUpdate("Service was added : \(service.uuid)")
        manager?.startAdvertising(getAdvertisementData(service))

    }

    func peripheralManagerDidStartAdvertising(_ peripheral: CBPeripheralManager, error: Error?){
        delegate?.statusUpdate("peripheralManagerDidStartAdvertising : \(peripheral.isAdvertising) : \(error.debugDescription)")
    }


    private func getAdvertisementData(_ service : CBService) -> Dictionary<String, Any>{
        var data : Dictionary<String, Any> = Dictionary<String, Any>()

        data["CBAdvertisementDataLocalNameKey"] = "e1fa36b4-9700-414b-a4e0-382a3e249e56"

        data["CBAdvertisementDataServiceUUIDsKey"] = [service.uuid]

        return data
    }
}

这是 Windows C# 代码(目前是一个简单的控制台应用程序):

    class Program
    {
        static void Main(string[] args)
        {

            BluetoothLEAdvertisementWatcher watcher = new BluetoothLEAdvertisementWatcher();
            watcher.ScanningMode = BluetoothLEScanningMode.Active;
            watcher.Received += Watcher_Received;

            DeviceWatcher devWatcher = DeviceInformation.CreateWatcher();
            devWatcher.Added += DevWatcher_Added;
            devWatcher.Updated += DevWatcher_Updated;

            watcher.Start();
            devWatcher.Start();

            while (true)
            {
            }

        }

        private static void DevWatcher_Updated(DeviceWatcher sender, DeviceInformationUpdate args)
        {
            Console.Write("\nUpdated\n");
        }

        private static void DevWatcher_Added(DeviceWatcher sender, DeviceInformation args)
        {
      //      Console.Write("Added : "+args.Name+"\n");

        }

        static List<ulong> tried = new List<ulong>();

        private static async void Watcher_Received(BluetoothLEAdvertisementWatcher sender, BluetoothLEAdvertisementReceivedEventArgs args)
        {

            if (tried.Contains(args.BluetoothAddress)) {
                return;
            }

            tried.Add(args.BluetoothAddress);


            Console.Write("Device found =================================================");

            Console.Write("\nDataSections: " + args.Advertisement.DataSections[0].Data);

            //BluetoothLEDevice device =  
            BluetoothLEDevice device = await BluetoothLEDevice.FromBluetoothAddressAsync(args.BluetoothAddress);
            try
            {
                Console.Write("\n GattServices: " + device.GetGattService(Guid.Parse("e1fa36b4-9700-414b-a4e0-382a3e249e56")).Uuid);
            }catch(Exception e)
            {
                Console.Write(e.ToString());
            }
            if(device.DeviceInformation == null)
            {
                Console.Write("DeviceInformation null");
                return;
            }

            if(device.DeviceInformation.Pairing == null)
            {
                Console.Write("Pairing null");
                return;

            }

            var res = await device.DeviceInformation.Pairing.PairAsync(DevicePairingProtectionLevel.None);

            Console.Write("Pair complete (?) ========================================"+res.Status);

        }
    }

抱歉有点乱...

预先感谢您的帮助，我也在尝试另一个方向(Windows 广告和 iOS 观看)它也不太顺利，如果有兴趣，这是我发布的关于这个主题的另一个问题:Listening to and accepting a BLE Connect request in windows

Answer 1

广告是被动的，因此您应该将代码从主动更改为被动，例如:watcher.ScanningMode = BluetoothLEScanningMode.Passive;

public sealed partial class MainPage : Page
{
    Windows.Devices.Bluetooth.Advertisement.BluetoothLEAdvertisementWatcher advertisementWatcher;

    public MainPage()
    {
        this.InitializeComponent();

        advertisementWatcher = new Windows.Devices.Bluetooth.Advertisement.BluetoothLEAdvertisementWatcher();

        advertisementWatcher.ScanningMode = Windows.Devices.Bluetooth.Advertisement.BluetoothLEScanningMode.Passive;
        advertisementWatcher.Received += AdvertisementWatcher_Received;

        advertisementWatcher.Start();
    }

    private void AdvertisementWatcher_Received(Windows.Devices.Bluetooth.Advertisement.BluetoothLEAdvertisementWatcher sender, Windows.Devices.Bluetooth.Advertisement.BluetoothLEAdvertisementReceivedEventArgs args)
    {
        System.Diagnostics.Debug.WriteLine("Address: {0:X}", args.BluetoothAddress);
    }
}

仅通过 .Received 回调，您应该开始看到数据的到来，例如:

地址:A45E60F3E896 地址:4BF5661A4EF2 地址:549F476B5F37 地址:4CB6DF3019A9 地址:4BF5661A4EF2 地址:106070EB42B1