我正在尝试从我的网络中的 UPnP 设备接收 UPnP 通知消息。但是当我发送 M-SEARCH 消息时,有时我没有得到任何答案。我的代码如下所示:
public bool StartListener()
{
if (this.ssdpSocket == null)
{
IPAddress localIpAddress = IPAddress.Any;
IPEndPoint localIpEndpoint = new IPEndPoint(localIpAddress, SsdpPort);
try
{
this.ssdpSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
this.ssdpSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, 1);
this.ssdpSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveBuffer, 16384);
this.ssdpSocket.Bind(localIpEndpoint);
this.ssdpSocket.SetSocketOption(
SocketOptionLevel.IP,
SocketOptionName.AddMembership,
new MulticastOption(IPAddress.Parse(SsdpMulticastAddress), localIpAddress));
this.ssdpSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 2);
this.ssdpSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastLoopback, true);
this.culture = Thread.CurrentThread.CurrentUICulture;
this.workerThreadListener = new WorkerThread(this.ssdpSocket, this.HandleSsdpMessage);
this.workerThreadListener.Start();
Log.InfoFormat("SSDP server bind successful [{0}]", localIpEndpoint);
return true;
}
catch (Exception exception)
{
Log.Info(string.Format("SSDP server bind failed [{0}]", localIpEndpoint), exception);
throw;
}
}
return false;
}
我找到了以下答案,但对我来说无法更改端口。有替代解决方案吗?