NetX Duo Webserver responding with Html-pages from memory? (not SD)

[Southbranch]

Hi,

I am running a NetX Duo webserver example for the STM32H735G-DK board, example given from STM32CubeMX.

The example as such works fine. A file is stored on the board's SD-memory (e.g index.html) and then when a request is made with the file name explicity given by: http//192.168.1.102/index.html, the file is fetched from the SD and responded back to the client (browser). 

Client requests are handled by the callback below:

UINT webserver_request_notify_callback(NX_WEB_HTTP_SERVER *server_ptr, UINT request_type, CHAR *resource, NX_PACKET *packet_ptr)
{

  CHAR temp_string[30] = {'\0'};
  CHAR data[512] = {'\0'};
  UINT string_length;
  NX_PACKET *resp_packet_ptr;
  UINT status;
  ULONG resumptions;
  ULONG suspensions;
  ULONG idle_returns;
  ULONG non_idle_returns;
  ULONG total_bytes_sent;
  ULONG total_bytes_received;
  ULONG connections;
  ULONG disconnections;
  ULONG main_thread_count;
  ULONG server_thread_count;
  ULONG led_thread_count;
  CHAR *main_thread_name;
  CHAR *server_thread_name;
  CHAR *led_thread_name;

  /*
  * At each new request we toggle the green led, but in a real use case this callback can serve
  * to trigger more advanced tasks, like starting background threads or gather system info
  * and append them into the web page.
  */
  /* Get the requested data from packet */
  if (strcmp(resource, "/GetTXData") == 0)
  {
    /* Let HTTP server know the response has been sent. */
    tx_thread_performance_system_info_get(&resumptions, &suspensions, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &non_idle_returns, &idle_returns);

    sprintf (data, "%lu,%lu,%lu,%lu", resumptions, suspensions, idle_returns, non_idle_returns);
  }
  else if (strcmp(resource, "/GetNXData") == 0)
  {
    nx_tcp_info_get(&NetXDuoEthIpInstance, NULL, &total_bytes_sent, NULL, &total_bytes_received, NULL,  NULL, NULL, &connections, &disconnections, NULL, NULL);
    sprintf (data, "%lu,%lu,%lu,%lu",total_bytes_received, total_bytes_sent, connections, disconnections);
  }
    else if (strcmp(resource, "/GetNetInfo") == 0)
  {
   sprintf(data, "%lu.%lu.%lu.%lu,%d", (IpAddress >> 24) & 0xff, (IpAddress >> 16) & 0xff, (IpAddress >> 8) & 0xff, IpAddress& 0xff, CONNECTION_PORT);
  }

    else if (strcmp(resource, "/GetTxCount") == 0)
  {
    tx_thread_info_get(&NxAppThread, &main_thread_name, NULL, &main_thread_count, NULL, NULL, NULL, NULL, NULL);
    tx_thread_info_get(&AppServerThread, &server_thread_name, NULL, &server_thread_count, NULL, NULL, NULL, NULL, NULL);
    tx_thread_info_get(&LedThread, &led_thread_name, NULL, &led_thread_count, NULL, NULL, NULL, NULL, NULL);
    sprintf (data, "%s,%lu ,%s,%lu,%s,%lu", main_thread_name, main_thread_count, server_thread_name, server_thread_count,led_thread_name, led_thread_count);

  }
    else if (strcmp(resource, "/GetNXPacket") == 0)
  {
    sprintf (data, "%lu", NxAppPool.nx_packet_pool_available);
  }
    else if (strcmp(resource, "/GetNXPacketlen") == 0)
  {
    sprintf (data, "%lu", (NxAppPool.nx_packet_pool_available_list)->nx_packet_length );
  }
  else if (strcmp(resource, "/LedOn") == 0)
  {
    printf(" Loggling Green Led On \n");
    tx_thread_resume(&LedThread);
  }
  else if (strcmp(resource, "/LedOff") == 0)
  {
    printf(" Loggling Green Led Off \n");
    HAL_GPIO_WritePin (LED1_GPIO_Port, LED1_Pin, GPIO_PIN_SET);
    tx_thread_suspend(&LedThread);
  }
  else
  {
    return NX_SUCCESS;
  }
  /* Derive the client request type from the client request. */
  nx_web_http_server_type_get(server_ptr, server_ptr -> nx_web_http_server_request_resource, temp_string, &string_length);

  /* Null terminate the string. */
  temp_string[string_length] = '\0';

  /* Now build a response header with server status is OK and no additional header info. */
  status = nx_web_http_server_callback_generate_response_header(server_ptr, &resp_packet_ptr, NX_WEB_HTTP_STATUS_OK,
                                                                strlen(data), temp_string, NX_NULL);

  status = _nxe_packet_data_append(resp_packet_ptr, data, strlen(data), server_ptr->nx_web_http_server_packet_pool_ptr, NX_WAIT_FOREVER);
  /* Now send the packet! */

  status = nx_web_http_server_callback_packet_send(server_ptr, resp_packet_ptr);
  if (status != NX_SUCCESS)
  {
    nx_packet_release(resp_packet_ptr);
    return status;
  }
  return(NX_WEB_HTTP_CALLBACK_COMPLETED);
}

Now the question, what if web pages are stored like this instead ( in RAM or FLASH):

char* myWebPage ="<Html><Head></Head><Body><h2>My Page</h2></Body></Html>";

 How could the callback be modified to reply with such Html-strings instead of using the SD-card?

Thanks in advance

[Southbranch · Accepted solution]

I found it on Microsoft docs 

UINT my_request_notify(NX_WEB_HTTP_SERVER *server_ptr, UINT request_type,
    CHAR *resource, NX_PACKET *packet_ptr)
{
    /* Look for the test resource! */
    if ((request_type == NX_WEB_HTTP_SERVER_GET_REQUEST) &&
        (strcmp(resource, "/test.htm") == 0))
    {
        /* Found it, override the GET processing by sending the resource
            contents directly. */
        nx_web_http_server_callback_data_send(server_ptr,
            "HTTP/1.0 200 \r\nContent-Length:" "103\r\nContent-Type: text/html\r\n\r\n",
            63);

        nx_web_http_server_callback_data_send(server_ptr, "<HTML>\r\n<HEAD><TITLE>NetX"
            "HTTP Test </TITLE></HEAD>\r\n"
            :<BODY>\r\n<H1>NetX Test Page"
            "</H1>\r\n</BODY>\r\n</HTML>\r\n", 103);

        /* Return completion status. */
        return(NX_WEB_HTTP_CALLBACK_COMPLETED);
    }

    return(NX_SUCCESS);
}