如何在xamarin.ios中解析蓝牙信标？

Question

我正在尝试用iphone和xamarin形式识别eddystone信标，所以我选择这个nuget包来做这个诀窍：https://github.com/andijakl/universal-beacon/

在android中，它很有效，可以识别各种类型的信标，包括eddystone信标。随着ios信标被识别，但我无法获得他们的类型和身份。所以我在库中看到这个CocoaBluetoothCentralDelegate类没有完全解析信息。我部分肯定这个注释代码有一些东西，但我不知道如何从advertData中提取我需要的信息。感谢所有能回答我的人！我也找到了这个答案，但它并不完整，它对我没有帮助：https://stackoverflow.com/a/54293722/7089089

internal class CocoaBluetoothCentralDelegate : CBCentralManagerDelegate
{
    public event EventHandler<BLEAdvertisementPacketArgs> OnAdvertisementPacketReceived;

    #region CBCentralManagerDelegate

    public override void ConnectedPeripheral(CBCentralManager central, CBPeripheral peripheral)
    {
        Debug.WriteLine($"ConnectedPeripheral(CBCentralManager central, CBPeripheral {peripheral})");
    }

    public override void DisconnectedPeripheral(CBCentralManager central, CBPeripheral peripheral, NSError error)
    {
        Debug.WriteLine($"DisconnectedPeripheral(CBCentralManager central, CBPeripheral {peripheral}, NSError {error})");
    }

    public override void DiscoveredPeripheral(CBCentralManager central, CBPeripheral peripheral, NSDictionary advertisementData, NSNumber RSSI)
    {
        Debug.WriteLine($"Cocoa peripheral {peripheral}");
        Debug.WriteLine($"Cocoa advertisementData {advertisementData}");
        Debug.WriteLine($"Cocoa RSSI {RSSI}");

        var bLEAdvertisementPacket = new BLEAdvertisementPacket()
        {
            Advertisement = new BLEAdvertisement()
            {
                LocalName = peripheral.Name,
                ServiceUuids = new List<Guid>(),
                DataSections = new List<BLEAdvertisementDataSection>(),
                ManufacturerData = new List<BLEManufacturerData>()
            },
            AdvertisementType = BLEAdvertisementType.ScanResponse,
            BluetoothAddress = (ulong)peripheral.Identifier.GetHashCode(),
            RawSignalStrengthInDBm = RSSI.Int16Value,
            Timestamp = DateTimeOffset.Now
        };

        //https://developer.apple.com/documentation/corebluetooth/cbadvertisementdataserviceuuidskey
        //if (advertisementData.ContainsKey(CBAdvertisement.DataServiceUUIDsKey))
        //{
        //    bLEAdvertisementPacket.Advertisement.ServiceUuids.Add(
        //        item: new BLEManufacturerData(packetType: BLEPacketType.UUID16List,
        //                                      data: (advertisementData[CBAdvertisement.DataServiceUUIDsKey])));
        //}

        //https://developer.apple.com/documentation/corebluetooth/cbadvertisementdataservicedatakey
        //if (advertisementData.ContainsKey(CBAdvertisement.DataServiceDataKey))
        //{
        //    bLEAdvertisementPacket.Advertisement.DataSections.Add(
        //        item: new BLEManufacturerData(packetType: BLEPacketType.ServiceData,
        //                                      data: advertisementData[CBAdvertisement.DataServiceDataKey]));
        //}

        //https://developer.apple.com/documentation/corebluetooth/cbadvertisementdatamanufacturerdatakey
        if (advertisementData.ContainsKey(CBAdvertisement.DataManufacturerDataKey))
        {
            bLEAdvertisementPacket.Advertisement.ManufacturerData.Add(
                item: new BLEManufacturerData(packetType: BLEPacketType.ManufacturerData,
                                              data: (advertisementData[CBAdvertisement.DataManufacturerDataKey]
                                                     as NSData).ToArray()));
        }

        // Missing CBAdvertisement.DataTxPowerLevelKey

        var bLEAdvertisementPacketArgs = new BLEAdvertisementPacketArgs(data: bLEAdvertisementPacket);
        OnAdvertisementPacketReceived?.Invoke(this, bLEAdvertisementPacketArgs);
    }

    public override void FailedToConnectPeripheral(CBCentralManager central, CBPeripheral peripheral, NSError error)
    {
        Debug.WriteLine($"FailedToConnectPeripheral(CBCentralManager central, CBPeripheral {peripheral}, NSError {error})");
    }

    public override void UpdatedState(CBCentralManager central)
    {
        switch (central.State)
        {
            case CBCentralManagerState.Unknown:
                Debug.WriteLine("CBCentralManagerState.Unknown");
                break;
            case CBCentralManagerState.Resetting:
                Debug.WriteLine("CBCentralManagerState.Resetting");
                break;
            case CBCentralManagerState.Unsupported:
                Debug.WriteLine("CBCentralManagerState.Unsupported");
                break;
            case CBCentralManagerState.Unauthorized:
                Debug.WriteLine("CBCentralManagerState.Unauthorized");
                break;
            case CBCentralManagerState.PoweredOff:
                Debug.WriteLine("CBCentralManagerState.PoweredOff");
                break;
            case CBCentralManagerState.PoweredOn:
                Debug.WriteLine("CBCentralManagerState.PoweredOn");
                central.ScanForPeripherals(peripheralUuids: new CBUUID[] { },
                                                           options: new PeripheralScanningOptions { AllowDuplicatesKey = true });
                break;
            default:
                throw new NotImplementedException();
        }
    }

    public override void WillRestoreState(CBCentralManager central, NSDictionary dict)
    {
        Debug.WriteLine($"WillRestoreState(CBCentralManager central, NSDictionary {dict})");
    }

    #endregion CBCentralManagerDelegate
}

Answer 1

如您在其他答案中所述：

通用信标库没有将iOS数据包转换为通用数据包的iOS实现。这需要实施。

在上面的代码中，您将展示可能的实现。实现显示可能存在许多问题，但我可以立即看到一个大问题：

显示的实现使用iOS CoreBluetooth回调来读取信标包数据。这有一个很大的问题：iBeacon检测不能与显示的代码一起使用。在iOS上，操作系统旨在使用CoreBluetooth API阻止对iBeacon数据包的检测。您必须使用CoreLocation API，而实现的实现不会这样做。

理论上可以使用显示的CoreBluetooth回调来解析Eddystone信标数据包和AltBeacon数据包（当应用程序仅在前台时，这是iOS上提供的制造商广告。）但是这听起来并不像我这个代码在任何地方关闭准备好去。

听起来我觉得你正在努力让这个工作在这里。您可能需要具备可靠iOS本机编程技能（以及CoreBluetooth / CoreLocation开发技能）的人才能使其正常工作。