UDPClient weird problem.

[Gangreen]

I'm trying to send bytes to a server, but I always get an exception at the send command saying: the socket should not be connected (line 26 in the code below).

This is weird right? cause I don't see how I can send without a connection...

I work in visual basic.net

Function sendCommand(ByVal command As String)
        Dim dpr2() As Byte
        Dim sender() As Byte = (prepCommand(command))


        '//find a useable port
        While (True)
            Try
                datagramSocket = New UdpClient(port)
                Console.WriteLine("success, using port " + datagramSocket.Client.LocalEndPoint.ToString)
                Exit While
            Catch ex As Exception
                Console.WriteLine("port " + port + " unusable, trying next port")
                port = port + 1
            End Try
        End While


        Try
            '//Create new UDP connection and connect to specified ip address + port
            datagramSocket.Connect(socketAddress.Address, socketAddress.Port)
            datagramSocket.ExclusiveAddressUse = False

            '//Initialize and send command as UDP packet to specified ip address and port
            Dim dps(sender.Length) As Byte
            datagramSocket.Send(sender, sender.Length, socketAddress)
            Console.WriteLine("Sending command to " & socketAddress.Address.ToString & ":" & socketAddress.Port)
        Catch Exc As Exception
            '//Catch failed command send
            Console.WriteLine("error: could not send UDP packet to server")
            Console.WriteLine("details: " + Exc.Message)
            datagramSocket.Close()
            Return Nothing
        End Try

[Plater]

UDP is a connectionless protocol, you do not establish a connection for it.

I really suggest you do some reading up on the subject matter.
It would be much easier for you to translate that java project to vb.net, if you actually understood the concepts behind the code.

[Gangreen]

UDP is a connectionless protocol, you do not establish a connection for it.

I really suggest you do some reading up on the subject matter.
It would be much easier for you to translate that java project to vb.net, if you actually understood the concepts behind the code.

You're probably right...my UDP - knowledge ain't that great

[Gangreen]

I've been reading, and (correct me if I'm wrong) it appears you can use UDP for communication with a remote server..

Read at 'remarks'

But I tried what was stated there, and tried several other things I have read elsewhere, but I'm still getting the exception...

I tried using the default constructor: new(), and then connect and send with the IPEndPoint, without the IPEndPoint in the send instruction, I tried using the constructor with the IPendPoint as argument....ple ase give me a hint

[Plater]

Hmm, very strange that the examples would say to connect. Would not be the first time the msdn has had copy/paste errors.

I think you would want something more like this:
[code=vbnet]
' Sends message to a different host using optional hostname and port parameters.
'sendBytes is your byte array
Dim udpClientB As New UdpClient()
udpClientB.Send (sendBytes, sendBytes.Lengt h, "AlternateHostM achineName", 11000)
[/code]

[Gangreen]

Yes, that did the trick, thank you so much.

Wow, I must say I'm learning quite a lot with this translating job .