test1.c

#include <string.h>
#include <stdio.h>
#include "setup.h"
#include "wizchip_conf.h"
#include "socket.h"

void HAL_Delay(uint16_t count);
void SerialPutString(char *s);
//#define PRINT_STR SerialPutString
#define GREETING_MSG 		 "Well done guys! Welcome to the IoT world. Bye!\r\n"
#define CONN_ESTABLISHED_MSG "Connection established with remote IP: %d.%d.%d.%d:%u\r\n"
#define SENT_MESSAGE_MSG	 "Sent a message. Let's close the socket!\r\n"
#define WRONG_RETVAL_MSG	 "Something went wrong; return value: %d\r\n"
#define WRONG_STATUS_MSG	 "Something went wrong; STATUS: %d\r\n"
#define LISTEN_ERR_MSG		 "LISTEN Error!\r\n"
/**
 * test procedure 
 * 
 * XP
 * > telnet 192.168.1.192 5000
 *
 * Windows 10
 * run telnet client
 * open 192.168.1.192 5000
 *
 */ 
void socket_test(int16_t port_no)
{
   uint8_t retVal, sockStatus;
//   char msg[60];   
   
   while(1) {
      // reconnect:
      /* Open socket 0 as TCP_SOCKET with port 5000 */
      if((retVal = socket(0, Sn_MR_TCP, port_no, 0)) == 0) {
        /* Put socket in LISTEN mode. This means we are creating a TCP server */
         if((retVal = listen(0)) == SOCK_OK) {
           /* While socket is in LISTEN mode we wait for a remote connection */
            while(sockStatus = getSn_SR(0) == SOCK_LISTEN)
               HAL_Delay(50);
            /* OK. Got a remote peer. Let's send a message to it */
            while(1) {
               /* If connection is ESTABLISHED with remote peer */
               if(sockStatus = getSn_SR(0) == SOCK_ESTABLISHED) {
               uint8_t remoteIP[4];
               uint16_t remotePort;
                 /* Retrieving remote peer IP and port number */
                  getsockopt(0, SO_DESTIP, remoteIP);
                  getsockopt(0, SO_DESTPORT, (uint8_t*)&remotePort);
                  printf(CONN_ESTABLISHED_MSG, (uint16_t) remoteIP[0], (uint16_t) remoteIP[1], (uint16_t) remoteIP[2], (uint16_t) remoteIP[3], remotePort);
                  /* Let's send a welcome message and closing socket */
                  if(retVal = send(0, GREETING_MSG, strlen(GREETING_MSG)) == (int16_t)strlen(GREETING_MSG))
                     printf(SENT_MESSAGE_MSG);
                  else { /* Ops: something went wrong during data transfer */
                     printf(WRONG_RETVAL_MSG, retVal);
                  }
               } else { /* Something went wrong with remote peer, maybe the connection was closed unexpectedly */
                  printf(WRONG_STATUS_MSG, sockStatus);
               }
               break;
            }
         } else /* Ops: socket not in LISTEN mode. Something went wrong */
           printf(LISTEN_ERR_MSG);
      } else { /* Can't open the socket. This means something is wrong with W5100 configuration: maybe SPI issue? */
         printf(WRONG_RETVAL_MSG, retVal);
      }   
      /* We close the socket and start a connection again */
      disconnect(0);
      close(0);  
   }
}