[lwip-users] question about api

[jack W]

hi everyone 


 i used the lwip's api to writ a tcpecho task in the ucos-II. the codes is here:

  sys_thread_new(tcpecho_thread, NULL);  

static void 
tcpecho_thread(void *arg)
{
  conn = netconn_new(NETCONN_TCP);
   ssPRINT("CONNECTTION IS ESTABLISHED\n");
  /* Bind connection to well known port number 7. */
  netconn_bind(conn, NULL, 7);
  ssPRINT("CONNECTTION IS BINDED\n");
  /* Tell connection to go into listening mode. */
  netconn_listen(conn);
  ssPRINT("Listening.......\n");
  while(1) {
        /* Grab new connection. */
        newconn = netconn_accept(conn);
        ssPRINT("accepted new connection %p\n");
        /* Process the new connection. */
        if(newconn != NULL) {
......

i set tcpip_debug to 1; and i can watch the debug info by the uart0;ssPRINT is 
a function that send char to the uart0;

IN the windows  i use the command “telnet 192.168.0.3 7” in the run dialog.

but in debug data that uart0 sent   i found  that 
"
+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags SYN -+-+-+-+-+-+-+-+-+-+-+-+-+-+
tcp_input: no PCB match found, resetting.
....."

i don't know  why the pcb is n't founded? i doubt where the pcb is established ?