Cannot receive data from UDP socket.. WHY??

• • Reply

  15 years ago

  by sieweng

  sieweng

  , United States

  Joined 15 years ago
  Dear all,
  
  I am working on receiving data from a DHCP server (linux machine) from a C# client program on windows. The server is connected to a hardware which sends out data on commands. It seems that I am able to send commands to the server and manage to get the hardware in capture mode but I cant receive any data. The progam just keeps polling.
  
  This is the code:
  
  class SimpleUdpClient
  {    
  static byte[] msg = new byte[2000];
  
     static IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9050);
     static Socket fd = new Socket(AddressFamily.InterNetwork,SocketType.Dgram, ProtocolType.Udp);
     static IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
     static EndPoint Remote = (EndPoint)(sender);
  
     static void send_msg()                    
     {
         if (fd == null)
         {
             Console.WriteLine("Failure to connect socket!");
         }
         fd.SendTo(msg,len, SocketFlags.None, ipep);
     }
  
     static void recieve_msg()
     {    fd.Connect(ipep);
  
         if (!(fd.Poll(1000000, SelectMode.SelectRead)))
         {
             Console.WriteLine("Timeout on answer!\n");
             len = 0;
             return;
         }    
         else{
             msg = new byte[2000];
             len = fd.ReceiveFrom(msg, ref Remote);
             }
     }
  
     unsafe static void Main()
     {    capture_off(using send function above to send commands for the hardware to send );    
  
  Is the code correct? Do I need to do any preformatting of the data array before I send out? network byte order? Totally nuts about what is the problem source?  Pls advise. Many many thanks!!
  
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