[lwip-users] netconn_connct returning always ERR_OK

[Marko Panger]

Hi all,

I'm writing a client app. which connects to a remote server. I'm running 
lwip under an rtos with

#define NO_SYS 0

I'm using the netconn sequential api and there is something about the 
netconn_connect() call which is confusing me.
If I try to connect to a non-existing server (nobody is listening on 
that ip on that port) the call still returns with ERR_OK.

Shouldn't be some other error code ?

In general how do I know that the other side has received the data send 
by the client with netconn_write() ?

Please find attached the code snipped below for reference.

Thanks in advance for your help and comments,
marko

   IP4_ADDR(&local_ip, 192, 168, 3, 2);
   IP4_ADDR(&net_mask, 255, 255, 255, 0);
   IP4_ADDR(&gateway, 192, 168, 3, 1);
   IP4_ADDR(&server_ip, 192, 168, 3, 1);
  
   netif_add(&slip_if, &local_ip, &net_mask, &gateway, NULL, 
slipif_init, tcpip_input);   
   netif_set_default(&slip_if);
   netif_set_up(&slip_if);
  
  
   /* Connect to server */
   conn = netconn_new_with_proto_and_callback(NETCONN_TCP, 6, 
server_conn_clb);   
  
   while(netconn_connect(conn, &server_ip, RVA_PORT) != ERR_OK)
       TSK_Sleep(100);

   while(1) {
       while(!(buf = netconn_recv(conn)))
           TSK_Sleep(10);
      
       netbuf_data(buf, (void*)&p, &len);
      
       payload_len = *p++;       
       /* Ping */
       switch(*p) {
           case 6:
               netconn_write(conn, p-1, len, true);
               netbuf_delete(buf);
               break;
       }
      
   }