[lwip-users] Issue in TCP Socket with freeRTOS

[Abdullah Shafiq]

Hello, I am using FRDM-K64F and have changed the TCP echo+ freeRTOS according to my need. I want a task that is always In a listening state. Whenever a new client gets connected a new task should be created and some functions should be added there. I am using the netconn api. I tried making the      struct netconn *conn, *newconn; global as I need the descriptor for netconn_write in another task. But I get an error : netconn_write: invalid conn . The code is as follows: -

 

#include "tcpecho.h"

 

#include "lwip/opt.h"

 

#if LWIP_NETCONN

 

#include "lwip/sys.h"

#include "lwip/api.h"

 

#define Multiple_Threads          0

 

/*-----------------------------------------------------------------------------------*/

int threadid = 0;

const struct netconn *conn, *newconn;

err_t err;

 

static void New_Accept_Thread(void *pvParameters)

{

                err_t err;

                char text[] = "Abdullah Shafiq";

                threadid ++;

                PRINTF("In New_Accept_Thread id = %d\r\n",threadid);

 

                while (1)

                {

 

                                                 for(;;)

                                                 {

                                  err = netconn_write(newconn, text, sizeof(text), NETCONN_COPY);

                                  vTaskDelay(100);

                                                 }

 

                }

}

static void

tcpecho_thread(void *arg)

{

    struct netbuf *buf;

    void *data;

    u16_t len;

    LWIP_UNUSED_ARG(arg);

 

  conn = netconn_new(NETCONN_TCP);

  netconn_bind(conn, IP_ADDR_ANY, 5000);

#endif /* LWIP_IPV6 */

  LWIP_ERROR("tcpecho: invalid conn", (conn != NULL), return;);

 

  netconn_listen(conn);

 

  while (1)

  {

                err = netconn_accept(conn, &newconn);

                if (err == ERR_OK)

                {

 

                   if(sys_thread_new("AcceptThread", New_Accept_Thread, NULL, 512, 2) == NULL)

                                   LWIP_ASSERT("tcpecho(): New Accept Task creation failed.", 0);

               

   

 

                 netconn_close(newconn);

                 netconn_delete(newconn);

 

                  } // if Accept Successfull

  }

}

I tried commenting out netconn_close and netconn_delete but got no success