I download  freertos for str192.
i try to program server/client program.  I set that str912 is server. and pc is client.
After program start, data receive and send for 8 times. It’s ok.
But 9th data didn’t receive and send.
Why do you above circustance?

If you have written your own client/server program, then I’m afraid only you will be able to debug it, unless you can provide a lot more information and code and find somebody willing to spend the time to look at it. Regards.

Thank for reading a message.
I use freertos version 5.0.2 target board program  following code for server 1. calling founction void vBasicWEBServer( void *pvParameters )   // basicweb.c
{
unsigned char pcMessageToExchange = “n init socketrn”; struct ip_addr xIpAddr, xNetMast, xGateway;
extern err_t ethernetif_init( struct netif *netif );     /* Parameters are not used – suppress compiler error. */
    ( void ) pvParameters;     /* Create and configure the EMAC interface. */
    IP4_ADDR( &xIpAddr, emacIPADDR0, emacIPADDR1, emacIPADDR2, emacIPADDR3 );
    IP4_ADDR( &xNetMast, emacNET_MASK0, emacNET_MASK1, emacNET_MASK2, emacNET_MASK3 );
    IP4_ADDR( &xGateway, emacGATEWAY_ADDR0, emacGATEWAY_ADDR1, emacGATEWAY_ADDR2, emacGATEWAY_ADDR3 );
    netif_add( &EMAC_if, &xIpAddr, &xNetMast, &xGateway, NULL, ethernetif_init, tcpip_input );     /* make it the default interface */
    netif_set_default( &EMAC_if );     /* bring it up */
    netif_set_up(&EMAC_if);    
    vSerialPutString( 0, pcMessageToExchange, strlen( pcMessageToExchange ) );
    /* Initialize HTTP */
    // httpd_init(); //kcs
   
    kcs_server();  // kcs   
/* Nothing else to do.  No point hanging around. */
vTaskDelete( NULL );
} void kcs_server()  // httpd.c
{
 
  struct tcp_pcb *pcb;   pcb = tcp_new();
 
  tcp_bind(pcb, IP_ADDR_ANY,2000);
 
  tcp_arg(pcb,NULL);
 
  pcb = tcp_listen(pcb);
 
  tcp_accept( pcb, helloworld_accept);
} void helloworld_accept( void *arg, struct tcp_pcb *pcb, err_t err)  // kcs
{
 
  int i,j;   vSerialPutString( 0, “acceptrn”, 10 );  
    vSerialPutString( 0, “readrn”, 8 );
    tcp_err(pcb,conn_err); // 2010.3.4 kim
    tcp_recv(pcb, kcs_receive);
    for(j = 0; j < 1; j++)
  {
    vSerialPutString( 0, “writern”, 9 );
    tcp_write(pcb, GREETING, strlen(GREETING),1);
    for( i = 0; i < 100;i++) ; 
  }   
 
} err_t kcs_receive(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err) // kcs
{
  int i;
  
  vSerialPutString( 0, “receivern”, 11);
 
  if( p != NULL)
  {
   
  tcp_recved(pcb,p->tot_len); // add kcs 2010.3.4
    vSerialPutString( 0, p->payload, p->tot_len );
   err = tcp_write(pcb,p->payload,p->tot_len ,1);
  }
  else if( err == ERR_OK)
  {
     vSerialPutString( 0, “socket closern”, 16 );
     tcp_close(pcb);
  }
 
  err = tcp_write(pcb,p->payload,p->len,1); } Above  code  run 8 times packet and ping reply, but  don’t run 9 times. and ping don’t reply
why did it run?

addtion I used lwip code.
Above code rewrite web server code.