How to implement send and receive hl7 data in .NET in ssh connection

Question

I\'m implementing an application in .Net. I have to create a connection by SSH which is works, but the HL7 data receiving fails. The destination is a raspberry pi. So when I

Answer 1

After days of struggling I have solved the problem. The main error was with the port forwarding. I would reccomend to use SSH.Net by Renci (There was algorithm error with Tamir ssh). After ssh connection created I used this to port forward:

           var port = new ForwardedPortLocal(localIP, localPort, "localhost", remotePort);

Check your localIP with ipconfig /all in cmd. Or use 127.0.0.1 as a loopback IP. SimpleMLLPClient did not worked for me so I used the direct tcp client query way. Like this:

            TcpClient ourTcpClient = new TcpClient();
            ourTcpClient.Connect(localIP, (int)localPort); 
            NetworkStream networkStream = ourTcpClient.GetStream();

            var sendMessageByteBuffer = Encoding.UTF8.GetBytes(testHl7MessageToTransmit.ToString());

            if (networkStream.CanWrite)
            {
                networkStream.Write(sendMessageByteBuffer, 0, sendMessageByteBuffer.Length);

                Console.WriteLine("Data was sent to server successfully....");
                byte[] receiveMessageByteBuffer = new byte[ourTcpClient.ReceiveBufferSize];
                var bytesReceivedFromServer = networkStream.Read(receiveMessageByteBuffer, 0, receiveMessageByteBuffer.Length);

                if (bytesReceivedFromServer > 0 && networkStream.CanRead)
                {
                    receivedMessage.Append(Encoding.UTF8.GetString(receiveMessageByteBuffer));
                }

                var message = receivedMessage.Replace("\0", string.Empty);
                Console.WriteLine("Received message from server: {0}", message);
            }

So it gave me instant answer with 0 bytes (not due timeout). And here comes Amit Joshi help. I used a query what he suggested with START_OF_BLOCK, CARRIAGE_RETURN and END_OF_BLOCK and finally started to work. Thank you Amit Joshi!

Additional info: In Android (java/Kotlin) jsch session setPortForwardingL works fine with three params:

        val session = jsch.getSession("user", sshIP, sshPort)
        session.setPassword("")
        jsch.addIdentity(privatekey.getAbsolutePath())
        // Avoid asking for key confirmation
        val prop = Properties()
        prop.setProperty("StrictHostKeyChecking", "no")
        session.setConfig(prop)
        session.connect(5000)
        session.setPortForwardingL(localForwardPort, "localhost", remotePort)

        val useTls = false
        val context = DefaultHapiContext()
        connection = context.newClient("localhost", localForwardPort, useTls)