/*
 * Copyright (c) 2001, Swedish Institute of Computer Science.
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 *
 * This file is part of the lwIP TCP/IP stack.
 * 
 * Author: Adam Dunkels <adam@sics.se>
 *
 * $Id: tcpecho.c,v 1.1 2001/12/12 10:00:54 adam Exp $
 *
 * Improvements made to the comments only by Bruce Cockburn, August 14, 2003
 */

#include "lwip/sys.h"
#include "lwip/api.h"
/*-----------------------------------------------------------------------------------*/
static void 
tcpecho_thread(void *arg)
{
  struct netconn *conn, *newconn;
  err_t err;

  /* SOCKET: Create a new connection identifier (i.e. a socket). */
  conn = netconn_new(NETCONN_TCP);

  /* BIND: Bind connection to the desired port number 7. */
  netconn_bind(conn, NULL, 7);
   
  /* LISTEN: Tell the connection to go into listening mode. */
  netconn_listen(conn);

  /* Enter the main connection request processing loop */
  while(1) {
    /* ACCEPT: Block here until a connection request is received */
    /* Any connection request will be handled using a new temporary socket */
    outstr("TCPecho: listening on port 7...\n\r");
    newconn = netconn_accept(conn);

    /* printf("TCPecho: accepted new connection %p\n", newconn); */
   outstr("TCPecho: accepted new connection\n\r");  
  
   /* Process the buffers that are received over the new connection. */
   if(newconn != NULL) {
      struct netbuf *buf;
      void *data;
      u16_t len;
      
      /* RECEIVE: Enter a while loop that processes any received buffers */
      while((buf = netconn_recv(newconn)) != NULL) {
	  outstr("TCPecho: Recved\n\r");

	  do {
          /* Retrieve the data and data_length from the received data buffer */
	    netbuf_data(buf, &data, &len);

          /* Display the received data to the terminal window */
	    outstrn(data,len);

          /* SEND: Echo the data buffer back to the sender */
	    err = netconn_write(newconn, data, len, NETCONN_COPY);
	    if(err != ERR_OK) {
	      /* printf("TCPecho: netconn_write: error \"%s\"\n", lwip_strerr(err)); */
	    }
	  } while(netbuf_next(buf) >= 0);
	  netbuf_delete(buf);
	
      } /* end while */

      /*printf("Got EOF, looping\n");*/
      /* Close the connection and recycle the temporary socket. */
      netconn_delete(newconn);
    }
  }
}
/*-----------------------------------------------------------------------------------*/
void
tcpecho_init(void)
{
  sys_thread_new(tcpecho_thread, NULL, 0);  
}
/*-----------------------------------------------------------------------------------*/