Hi,
I am really looking for some help in how to write code for my FPGA boardfor implementing a TCP Client using lwIP API using the commands likenetconn_connect() and so on. I found some documentation on how to build aTCP server but I could not find any help for TCP client. Any help regardingon how to build a client would be great. If any body has an idea regardingone of teh three topics which i have mentioned below, then that would behelping me a lot:

1)I am looking for some basic explanation like what are the steps i need toconsider to write a client code from scratch.

2)or a sample code which shows the basic implementation of TCP client usinglwIP API

3)or what changes should I need to make in the server program so that itcan run as a client

Kind Regards,
Mahee

	   
					
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The easiest way I found for that, is to use the
socket API.

The CONNECT code looks similar to this:

struct sockaddr_in sServer;
sServer.sin_len = sizeof(struct sockaddr_in);
sServer.sin_family = AF_INET;
sServer.sin_port = MY_PORT_NUMBER;
inet_aton("123.45.123.45", &(sServer.sin_addr));
memset(&(sServer.sin_zero), 0, sizeof(sServer.sin_zero));

int nSocket = lwip_socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (nSocket < 0) {
  printf("lwip_socket() returned -%d\r\n", -nSocket);
  return;
}

printf("Connecting to server\r\n");

int nErr = lwip_connect(nSocket, (struct sockaddr*)(&sServer),
sizeof(sServer));
if (nErr < 0) {
  printf("lwip_connect() returned -%d, errno=%d\r\n", -nErr,
lwip_get_err(nSocket));
  return;
}

After that, you can use lwip_send() and lwip_recv() for data
transmission.

Best regards