some udp help

[corydg]

Hi,

I have a piece of software running on a linux box that is transmitting information every few minutes over UDP to a destination port of 3052. After looking at a packet sniffer, the data is making it to the computer that I am having problems with.

I need to create a program that will listen on port 3052 and receive that data. I have tried for several hours to find source code to listen only, but i'm having little luck with that. I am using VB .net 2005.

thanks,

cory

[jmcilhinney]

The MSDN help topic for the UdpClient.BeginReceive method has a code example of basically what you want. It's in C# only, but here's a translation courtesy of Instant VB:

Public Shared messageReceived As Boolean = False

Public Shared Sub ReceiveCallback(ByVal ar As IAsyncResult)
  Dim u As UdpClient = CType((CType(ar.AsyncState, UdpState)).u, UdpClient)
  Dim e As IPEndPoint = CType((CType(ar.AsyncState, UdpState)).e, IPEndPoint)

  Dim receiveBytes As Byte() = u.EndReceive(ar, e)
  Dim receiveString As String = Encoding.ASCII.GetString(receiveBytes)

  Console.WriteLine("Received: {0}", receiveString)
  messageReceived = True
End Sub

Public Shared Sub ReceiveMessages()
  ' Receive a message and write it to the console.
  Dim e As IPEndPoint = New IPEndPoint(IPAddress.Any, listenPort)
  Dim u As UdpClient = New UdpClient(e)

  Dim s As UdpState = New UdpState()
  s.e = e
  s.u = u

  Console.WriteLine("listening for messages")
  u.BeginReceive(New AsyncCallback(AddressOf ReceiveCallback), s)

  ' Do some work while we wait for a message. For this example,
  ' we'll just sleep
  Do While Not messageReceived
    Thread.Sleep(100)
  Loop
End Sub