[lwip-users] Problem with netconn_connect

[olivier . hachet2]

Hi all,
 
I try to send the famous "hello world" between two remote machines on linux.
I have programmed a server on tap0 at ipaddr 192.168.0.2, I open a socket
with the netconn API and I wait for a connection on port 19. When somebody
is connected, the server shall send "Hello world!". So, after having
launched the server, I try on linux
# telnet 192.168.0.2 19 
I receive the message. I am happy. 
So I wrote a client that tries to connect to the same address on the same
port with the APIs and it can't connect to it. I have an error -3 on
netconn_connect.
In fact, I have the same problem if I work on 1 local machine.
 
Thanks to help me ASAP.
 
Olivier
 
Here is the piece of code of the server:
  sem = sys_sem_new(0);
  tcpip_init(tcpip_init_done, &sem);
  sys_sem_wait(sem);
  sys_sem_free(sem);

  IP4_ADDR(&gw, 192,168,0,1);
  IP4_ADDR(&ipaddr, 192,168,0,2);
  IP4_ADDR(&netmask, 255,255,255,0);
 
  netif_set_default(netif_add(&netif_unix, &ipaddr, &netmask, &gw, NULL,
tapif_init, tcpip_input));

  sleep(4);

  test_init();
    
  sys_timeout(5000, tcp_timeout, NULL);
 
with test_init function:
  connection = netconn_new(NETCONN_TCP); 
  netconn_bind(connection, NULL, 19);
  netconn_listen(connection); 
  
  while (1) { 
    printf("Waiting for a connection... !\n"); 
    new_connection = netconn_accept(connection); 
    printf("server got connection !\n"); 
    sleep(10); 
    netconn_write(new_connection, "Hello world!\n", 14, NETCONN_COPY); 
  } 
  netconn_delete(new_connection); 
  netconn_delete(connection); 

The client side code is:
  sys_init();
  mem_init();
  memp_init();
  pbuf_init();
  
  tcpdump_init();
      
  sem = sys_sem_new(0);
  tcpip_init(tcpip_init_done, &sem);
  
  printf("test socket!!\n");
  if (inet_aton("192.168.0.2", (struct in_addr *)&addr) == -1)
    {
      printf("Error on address syntax.\n");
    }
  printf("try to open a socket...\n");
  connection = netconn_new(NETCONN_TCP);
  
  netconn_bind(connection, &addr, 19);
  printf("bind\n");
  err =  netconn_connect(connection, &addr, 19);
  if (err != ERR_OK) 
    {
      fprintf(stderr, "error %s\n", lwip_strerr(err));
      netconn_delete(connection);
      connection = NULL;
      exit(1);
    }
  printf("connect done\n");
  
  while ((buf = netconn_recv(connection)) != NULL) {
    printf("netconn_recv n");
    printf("Received from port:%d", buf->fromport);
    netbuf_data(buf, &msg, &len);
    printf("Received data:%s", msg);
  }
  
  return 0;