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ios - Xamarin中如何正确的给CBPeripheralManager添加服务

转载 作者:塔克拉玛干 更新时间:2023-11-02 22:05:50 26 4
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我正在尝试使用 Visual Studio for Mac 将服务添加到 IOS 的 CBPeripheralManager。但是,当我使用另一台设备扫描我的外围设备时,我看不到我添加的服务。广告名称是正确的,但我只看到其他服务(大概是iphone默认的)。

作为旁注,我用 swift 编写了程序并遇到了同样的问题。

我的xcode版本是9,我的ios目标版本是11。

我的代码如下

CBPeripheralManager _peripheral;
public BLEPeripheral()
{
_peripheral = new CBPeripheralManager();//this, DispatchQueue.CurrentQueue);
_peripheral.CharacteristicSubscribed += (object sender, CBPeripheralManagerSubscriptionEventArgs e) =>
{
Console.WriteLine("Device Subscribed: {0}", e.Central.UUID);
_connectedDevices.Add(e.Central);
ServiceSubscribed(this, e);
};

_peripheral.WriteRequestsReceived += (object sender, CBATTRequestsEventArgs e) => {
Console.WriteLine("Write Request Received");
};


_peripheral.ServiceAdded += (object sender, CBPeripheralManagerServiceEventArgs e) =>
{
Console.WriteLine("Service {0} was added", e.Error);
Console.WriteLine(e.Service.Characteristics.Length.ToString());
Console.WriteLine(e.Service.UUID.ToString());

IsAdvertising = true;
StartAdvertisingOptions advOptions = new StartAdvertisingOptions();
advOptions.LocalName = "myDevice";

_peripheral.StartAdvertising(advOptions);
Console.WriteLine("starting the advertisement");
};

_peripheral.AdvertisingStarted += (object sender, Foundation.NSErrorEventArgs e) =>
{
Console.WriteLine("Advertising did start");
};

_peripheral.StateUpdated += (object sender, EventArgs e) =>
{
Console.WriteLine("UpdatedState: {0}", _peripheral.State);
};

}

我设置服务的代码是:

public void setupService()
{
txChar = new CBMutableCharacteristic(txCharUUID, CBCharacteristicProperties.Notify, null, CBAttributePermissions.Readable);
var MyServiceUUID = CBUUID.FromString("A66C4FFC-52C6-4C04-B97C-34E5E91DG5BG");

MyService = new CBMutableService(MyServiceUUID, true);
MyService.Characteristics = new CBMutableCharacteristic[] { txChar };
_peripheral.AddService(MyService);

}

peripheralmanager 的状态为 PoweredOn。我在按下添加服务和开始广告的按钮之前检查了这一点。

最佳答案

您的解决方案不起作用的主要原因可能是 CBPeripheralManager 方法必须仅在其处于 State==PoweredOn 时使用。 Apple documentation在概述中说明了这一点。

我可以在您的示例中看到另一个潜在的小问题。在 StartAdvertisingOption 中,您没有设置 ServiceUUID,因此您没有为您的服务做广告。它应该是 StartAdvertisingOptions advOptions = new StartAdvertisingOptions { LocalName = "myDevice", ServicesUUID = new CBUUID[] { _uuidService } };

下面是一个可行的解决方案,我在 UpdateState 事件中移动了所有 CBPeripheralManager 逻辑:

public class BleGattServerManager
{
private CBPeripheralManager _PeripheralManager;
private CBUUID _uuidService = CBUUID.FromString("625D74A2-3E61-4D1E-8949-8BE42DFDC6DA");

public BleGattServerManager()
{
//set up peripheral
_PeripheralManager = new CBPeripheralManager();
_PeripheralManager.StateUpdated += _PeripheralManager_StateUpdated;
_PeripheralManager.AdvertisingStarted += _PeripheralManager_AdvertisingStarted;
_PeripheralManager.ServiceAdded += _PeripheralManager_ServiceAdded;
}

private void _PeripheralManager_ServiceAdded(object sender, CBPeripheralManagerServiceEventArgs e)
{
System.Diagnostics.Debug.WriteLine("Service added");
}

private void _PeripheralManager_AdvertisingStarted(object sender, NSErrorEventArgs e)
{
System.Diagnostics.Debug.WriteLine("Advertising started");
}

private void _PeripheralManager_StateUpdated(object sender, EventArgs e)
{
System.Diagnostics.Debug.WriteLine("State=" + _PeripheralManager.State);

if (_PeripheralManager.State == CBPeripheralManagerState.PoweredOn)
{
//set up the GATT service
CBUUID uuidCharact = CBUUID.FromString("5BDAFB34-DA3F-40AA-8F9C-8AD409CB0063");
NSData readme = NSData.FromString("readme!");
CBMutableCharacteristic _CharacRead = new CBMutableCharacteristic(uuidCharact, CBCharacteristicProperties.Read, readme, CBAttributePermissions.Readable);
CBMutableService service = new CBMutableService(_uuidService, true);
service.Characteristics = new CBMutableCharacteristic[] { _CharacRead };

_PeripheralManager.AddService(service);

StartAdvertisingOptions advData = new StartAdvertisingOptions { LocalName = "my GATT!", ServicesUUID = new CBUUID[] { _uuidService } };
_PeripheralManager.StartAdvertising(advData);
}
}
}

关于ios - Xamarin中如何正确的给CBPeripheralManager添加服务,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47716181/

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