You are creating a new task here
if(sys_thread_new("AcceptThread", New_Accept_Thread,
NULL, 512, 2) == NULL)
LWIP_ASSERT("tcpecho(): New Accept Task
in the very next line you are closing connection here
netconn_close(newconn);
netconn_delete(newconn);
the code does not guarantee that your connection will be alive by the time
your created task (New_Accept_Thread) come to execution.
Sol : why you want to create a task when the data is received instead you
can create a function. that will solve your problem.
Regards,
Mohsin Madki.
On Mon, Jan 1, 2018 at 3:10 PM, abdullah246 <[email protected]>
wrote:
> 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"
>
> /*----------------------------------------------------------
> -------------------------*/
> 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
>
>
>
>
> --
> Sent from: http://lwip.100.n7.nabble.com/lwip-users-f3.html
>
> _______________________________________________
> lwip-users mailing list
> [email protected]
> https://lists.nongnu.org/mailman/listinfo/lwip-users
>
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