Hi, I create a project on stm32f746 nucleo board using LWIP stack (netconn) and FreeRTOS.
The main function of this project is HTTP server. But I have a few problems with this functionality - they are errors of connection and close states of HTTP session.
Have anybody working project of HTTP server (netconn) which can make a good connection without errors, RST, retransmissions? I am needed a code of stability working server because tested a lot of codes, but all of its works not perfect.
Maybe I did a mistake in this code?
Code which I use:
typedef struct struct_sock_t {
struct netconn *conn;
} struct_sock;
struct_sock sock;
void StartDefaultTask(void const * argument)
{
/* init code for LWIP */
MX_LWIP_Init();
/* USER CODE BEGIN 5 */
//-----------------------------------------------------------
struct netconn *conn;
err_t err;
conn = netconn_new(NETCONN_TCP);
if(conn!=NULL)
{
sock.conn = conn;
err = netconn_bind(conn, NULL, 80);
if(err == ERR_OK)
{
netconn_listen(conn);
sys_thread_new("tcp_thread", tcp_thread, (void*)&sock, DEFAULT_THREAD_STACKSIZE, osPriorityNormal);
}
else
{
netconn_delete(conn);
HAL_GPIO_WritePin(GPIOG, GPIO_PIN_7, GPIO_PIN_SET); // LED RED
}
}
for(;;)
{
osDelay(1);
}
//-----------------------------------------------------------
/* USER CODE END 5 */
}static void tcp_thread(void *arg)
{
err_t recv_err; // Variables for arguments (errors)
err_t err; // Variables for arguments (errors)
struct netconn *conn; // Structure for connection
struct netconn *newconn; // Structure for connection
struct netbuf *inbuf; // Pointer to connection buffer
struct_sock *arg_sock; // Pointer to arguments of task
arg_sock = (struct_sock*) arg;
conn = arg_sock->conn;
u16_t buflen;
char* buf;
struct fs_file file;
for(;;)
{
err = netconn_accept(conn, &newconn);
if (err == ERR_OK)
{
recv_err = netconn_recv(newconn, &inbuf); // Receiving the socket data in inbuf
if (recv_err == ERR_OK)
{
if (netconn_err(newconn) == ERR_OK)
{
netbuf_data(inbuf, (void**)&buf, &buflen);
if ((buflen >=5) && (strncmp(buf, "GET /", 5) == 0))
{
if ((strncmp((char const *)buf,"GET / ",6)==0)||(strncmp((char const *)buf,"GET /index.html",15)==0))
{
fs_open(&file, "/index.html");
netconn_write(newconn, (const unsigned char*)(file.data), (size_t)file.len, NETCONN_NOCOPY);
fs_close(&file);
}
else if (strncmp((char const *)buf,"GET /IMG/Test.png",17)==0)
{
fs_open(&file, "/IMG/Test.png");
netconn_write(newconn, (const unsigned char*)(file.data), (size_t)file.len, NETCONN_NOCOPY);
fs_close(&file);
}
else
{
fs_open(&file, "/404.html");
netconn_write(newconn, (const unsigned char*)(file.data), (size_t)file.len, NETCONN_NOCOPY);
fs_close(&file);
}
}
else
{
osDelay(1);
}
}
else
{
osDelay(1);
}
}
netbuf_delete(inbuf);
netconn_close(newconn);
netconn_delete(newconn);
}
else
{
osDelay(1);
}
}
}
1 ACCEPTED SOLUTION
Accepted Solutions
Hi @Walid ZRELLI, I changed now the code of my HTPP server and added AJAX (it's for sending data array to HTTP client (browser) and building a chart of this array). So I have a couple of problems now. The first is a big delay with the renovation of the chart(It must be once to second because the client sends GET requests every 1000 msec) but in reality the chart brake and renovation once to 5-30 seconds. And the second one is a lot of RST/RST,ACK HTTP packages. So I feel like for everyone GET request the server creates a new connection, but do not close it.
Added to code
else if (strncmp((char const *)buf,"GET /js/Chart.min.js",20)==0)
{
fs_open(&file, "/js/Chart.min.js");
netconn_write(newconn, (const unsigned char*)(file.data), (size_t)file.len, NETCONN_NOCOPY);
fs_close(&file);
}
else if (strncmp((char const *)buf,"GET /content.bin",16)==0)
{
DynWebPage(newconn, arg_sock->y_pos);
}Where DynWebPage generator of random number. It is just for example
void DynWebPage(struct netconn *conn, uint16_t y_pos)
{
portCHAR PAGE_BODY[1300];
uint16_t len = 0;
int i;
PAGE_BODY[0] = 0;
int val = 0;
sprintf(PAGE_BODY,"%s%s%s%s%drn%s",PAGE_HEADER_200_OK,PAGE_HEADER_SERVER,PAGE_HEADER_CONTENT_STREAM,PAGE_HEADER_LEN,1024,PAGE_HEADER_BYTES);
len = strlen(PAGE_BODY);
for(i=0;i<512;i++)
{
val = HAL_RNG_GetRandomNumber(&hrng)%4096;
PAGE_BODY[len + i * 2] = (uint8_t)val;
PAGE_BODY[len + i * 2 + 1] = (uint8_t)(val>>8);
}
netconn_write(conn, PAGE_BODY, strlen((char*)PAGE_BODY) + 1024, NETCONN_COPY);
}And a example of Wireshark session. Also I can show html code of server
