TCP Client Problem

[afra]

Hi

I'm using netconn api library to make tcp server and client on stm32f746

Tcp server works properly but client can not connect to server and it returns error code -4 (err1) which means routing problem

I don't understand the reason

here is my code

struct netconn *conn, *newconn;

   err_t err, recv_err, err1;

   struct netbuf *buf, *mybuf;

   ip_addr_t DestIPaddr;

   ip_addr_t LocalIPaddr;

   ip_addr_t ipaddr_server;

   ip_addr_t ipaddr_client;

   static unsigned short port;

   char *data;

 /* Create a new TCP connection handle */

   conn = netconn_new(NETCONN_TCP);                                       // create new TCP connection

 if (conn!= NULL)

 {

      IP4_ADDR(&DestIPaddr,192,168,1,31);

      err1 = netconn_connect(conn, &DestIPaddr,8234);

      printf("%d",err1);

      netconn_bind(conn, &ipaddr_client, 3262);

      if (err1 == ERR_OK)

      {

         /* Put the connection into LISTEN state */\

         printf("Hooray! %d",configUSE_TIME_SLICING);

         while(1)

         {

               mybuf = netbuf_new();

               data = netbuf_alloc(mybuf, 10);

               /* create some arbitrary data */

               for(int i = 0; i < 10; i++)

               {

                  data[i] = i;

               }

               /* send the arbitrary data */

               recv_err = netconn_recv(conn, &buf);

               if (recv_err == ERR_OK)

               {

                  data[0] ++;

               }

               err = netconn_send(conn, mybuf);

               if( err == ERR_OK)

               {

                  printf("send successfully");

               }

               netbuf_delete(mybuf);

               osDelay(1);      

         }

      }

  }