/******************************************************************
* purpose: Implement tcp server, listen and receive the tcpip data,
* then send data to com port
* parameter:
********************************************************************/
public void Server()
{
// Buffer for reading data
Byte[] bytes = new Byte[256];
listener = new TcpListener(IPAddress.Any, _port);
listener.Start();
// Enter the listening loop.
while (true)
{
try
{
_serialPort.readTCPListener(this);
// Perform a blocking call to accept requests.
// You could also use server.AcceptSocket() here.
client = listener.AcceptTcpClient();
// Get a stream object for reading and writing
NetworkStream stream = client.GetStream();
int i;
// Loop to receive all the data sent by the client.
while ((i = stream.Read(bytes, 0, bytes.Length)) != 0)
{
string strReceiveIPData = System.Text.Encoding.ASCII.GetString(bytes, 0, i);
if (_serialPort != null && _serialPort.IsPortOpen())
{
_serialPort.port_write(bytes, i);
}
}
}
catch (Exception ex)
{
Trace.WriteLine(DateTime.Now + " TCP/IP Exception: " + ex.Message);
listener.Stop();
listener = new TcpListener(IPAddress.Any, _port);
listener.Start();
}
}
}
private void ReadCallback(IAsyncResult ar)
{
String content = String.Empty;
// Retrieve the state object and the handler socket
// from the asynchronous state object.
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.workSocket;
int bytesRead = 0;
try
{
// Read data from the client socket.
bytesRead = handler.EndReceive(ar);
}
catch (Exception exp)
{
Console.WriteLine("Read port exception " + exp.Message);
bytesRead = 0;
}
if (bytesRead > 0)
{
// There might be more data, so store the data received so far.
state.sb.Append(Encoding.ASCII.GetString(
state.buffer, 0, bytesRead));
// Check for end-of-file tag. If it is not there, read
// more data.
content = state.sb.ToString();
Console.WriteLine("Read {0} bytes from socket. \n Data : {1}",
content.Length, content);
remoteIpEndPoint = (IPEndPoint)handler.RemoteEndPoint;
string remoteIdEndPointAddress = ((IPEndPoint)handler.RemoteEndPoint).Address.ToString();
string remoteIpEndPointPort = ((IPEndPoint)handler.RemoteEndPoint).Port.ToString();
//localIpEndPoint = handler.LocalEndPoint as IPEndPoint;
// Using the RemoteEndPoint property.
Console.WriteLine("I am connected to " + remoteIdEndPointAddress +
" on port number " + remoteIpEndPointPort);
// Using the LocalEndPoint property.
Console.WriteLine("My local IpAddress is :" +
IPAddress.Parse(((IPEndPoint)handler.LocalEndPoint).Address.ToString()) +
" I am connected on port number " + ((IPEndPoint)handler.LocalEndPoint).Port.ToString());
Send(handler, " Echo " + content); //test ok
//Send1(content + " Send back2");
if (_serialPort != null && _serialPort.IsPortOpen())
{
_serialPort.port_write(content);
}
else
{
//Console.WriteLine("COM PORT not open!!!");
// Not all data received. Get more.
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReadCallback), state);
}
state.sb.Clear();
//handler.Shutdown(SocketShutdown.Both);
// handler.Close();
}
}