Re: [lwip-users] http_client.c - heap memory overflow

[address@hidden]

Am 05.01.2020 um 23:41 schrieb Jaroslav:
> Hello,
> I am using LWIP 2.1.2 + FreeRTOS 10 on board TM4C1294XL. I am trying to
> push measured data to a web server using http_client.c. I mannaged to
> make it working based on example in
> https://lists.nongnu.org/archive/html/lwip-users/2019-07/msg00001.
>
> However, with each calling of httpc_get_file_dns usage of heap memory
> increases, and after approx 500th calling the application stops working
> due to heap memory overflow:
>
> MEM HEAP:
>           avail: 32768
>           used: 31948
>           max: 32732
>           err: 561
>
> and I am getting the following erros:
>
> httpc_result: 7
> memp_malloc: out of memory in pool TCP_PCB
> mem_malloc: could not allocate 412 bytes

Heap (mem_*) and pool (memp_*) are a bit confused here, can you clarify
this?

Because TCP pcbs are meant to live on after being closed (time-wait
state), so maybe you are seeing this?

Regards,
Simon

> Here is my simplified code:
>
> --------------------------------------------------------
> #define STACKSIZE_HTTPCTASK       4096
>
> err_t
> RecvCallback(void *arg, struct tcp_pcb *tpcb, struct pbuf *p, err_t err)
> {
>       char str[100];
>       if (p == NULL)
>          UARTprintf("NULL TCP packet received\n");
>       else
>       {
>           memcpy(&str, p->payload, p->len);
>         if(strstr(str, "success") == NULL)
>             UARTprintf("GET FAILED: %s\n", str);
>       }
>        pbuf_free(p);
>        tcp_close(tpcb);
>        return ERR_OK;
> }
>
> err_t
> RecvHttpHeaderCallback(httpc_state_t *connection, void *arg, struct pbuf
> *hdr, u16_t hdr_len, u32_t content_len)
> {
>       return ERR_OK;
> }
>
> void
> HttpClientResultCallback(void *arg, httpc_result_t httpc_result, u32_t
> rx_content_len, u32_t srv_res, err_t err)
> {
>       UARTprintf("httpc_result: %u\n", httpc_result);
>       UARTprintf("received number of bytes: %lu\n", rx_content_len);
> }
>
> static void
> HttpcTask(void *pvParameters)
> {
>       portTickType ui32LastTime;
>       httpc_connection_t conn_settings;
>       httpc_state_t *connection;
>
>       conn_settings.use_proxy = 0;
>       conn_settings.headers_done_fn = RecvHttpHeaderCallback;
>       conn_settings.result_fn = HttpClientResultCallback;
>       ui32LastTime = xTaskGetTickCount();
>
>       while(1)
>       {
>         httpc_get_file_dns("my.domain.com", 80, "/write.php?d=myData",
> &conn_settings, RecvCallback, NULL, &connection);
>         vTaskDelayUntil(&ui32LastTime, g_ui32HttpcDelay / portTICK_RATE_MS);
>       }
> }
>
> uint32_t
> HttpcTaskInit(void)
> {
>       xTaskCreate(HttpcTask, (const portCHAR *)"Httpc",
> STACKSIZE_HTTPCTASK, NULL,
>                      tskIDLE_PRIORITY + PRIORITY_HTTPC_TASK, NULL)
>       return(0);
> }
> ------------------------------------------------------------
>
> Any idea what I am doing wrong?
>
> Thanks
>
> Jaroslav
>
>
>
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