C# read server with socket (ASCII)

[Guilherme_]

I'm trying to read a server (energy meter) using socket or tcpclient. To read the server you need to send commands.

Commands (ASCII communication):

Octet 001: SOH;
Octet 002: Access code: "0" - Read "1" - Demand "2" - Update
Octet 003: STX;
Octet 004-135: Command for convencional communication server/reader, converted nibble to nibble to ASCII code including CRC;
Octet 136: ETX;
Octet 137: LRC;

My Tcp Client code:

static void Connect(String server, String message)
{
try
{
// Create a TcpClient.
// Note, for this client to work you need to have a TcpServer
// connected to the same address as specified by the server, port
// combination.
Int32 port = 80;
TcpClient client = new TcpClient(server, port);

// Translate the passed message into ASCII and store it as a Byte array.
Byte[] data = System.Text.Encoding.ASCII.GetBytes(message);

// Get a client stream for reading and writing.
// Stream stream = client.GetStream();

NetworkStream stream = client.GetStream();

// Send the message to the connected TcpServer.
stream.Write(data, 0, data.Length);

Console.WriteLine("Sent: {0}", message);

// Receive the TcpServer.response.

// Buffer to store the response bytes.
data = new Byte[256];

// String to store the response ASCII representation.
String responseData = String.Empty;

// Read the first batch of the TcpServer response bytes.
Int32 bytes = stream.Read(data, 0, data.Length);
responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
Console.WriteLine("Received: {0}", responseData);

// Close everything.
stream.Close();
client.Close();
}
catch (ArgumentNullException e)
{
Console.WriteLine("ArgumentNullException: {0}", e);
}
catch (SocketException e)
{
Console.WriteLine("SocketException: {0}", e);
}

Console.WriteLine("\n Press Enter to continue...");
Console.Read();
}


My question is how to convert this commands to send to server? I have no idea what SOH, STX, ETX, LRC means.

What i've tried:

Connect("192.168.0.250", "0");
Connect("192.168.0.250", "1");
Connect("192.168.0.250", "2");

But no server response.

Continue reading...