websocket connection and transmit data from stm32f7 using LWIP

[sunil]

Hi

I am developing the project with STM32F746 (STMCUBE IDE)

sending the data to the server . want to use WEBSOCKET protocol to do this

Is there any Library with example for WEBSOCKET with LWIP in STM32

[Imen.D]

Hello @sunil​  and welcome to the STM32 Community :smiling_face_with_smiling_eyes:,

Have a look to the LwIP example under STM32CubeF7 MCU package, that can help you as an implementation example: 

STM32Cube_FW_F7_V1.16.0\Projects\STM32746G-Discovery\Applications\LwIP\LwIP_HTTP_Server_Netconn_RTOS

For more details about LwIP, please refer to this UM1713 : “Developing applications on STM32Cube with LwIP TCP/IP stack�?.

Imen

[sunil]

Hi @Imen DAHMEN​ ,

Thanks for your support. I have tried LwIP_HTTP_Server_Netconn_RTOS from the example code and it works in NUCLEO-F746ZG. and also i searched example for SOCKET_API but it is not there for this NUCLEO-F746ZG board. I tried on own with help of STM example from some other board. The initialization was working fine but during entering IP address

it return the value -1

ret1 = read(conn, recv_buffer, buflen);

 if(ret1 < 0) return;

and the full http-server-socket code is

void http_server_serve(int conn)

{

 int buflen = 1500;

 //int ret;

 struct fs_file file;

 unsigned char recv_buffer[1500];

 /* Read in the request */

 ret1 = read(conn, recv_buffer, buflen);

 if(ret1 < 0) return;

 /* Check if request to get ST.gif */

 if (strncmp((char *)recv_buffer,"GET /STM32F7xx_files/ST.gif",27)==0)

 {

   fs_open(&file, "/STM32F7xx_files/ST.gif");

   write(conn, (const unsigned char*)(file.data), (size_t)file.len);

   fs_close(&file);

 }

 /* Check if request to get stm32.jpeg */

 else if (strncmp((char *)recv_buffer,"GET /STM32F7xx_files/stm32.jpg",30)==0)

 {

   fs_open(&file, "/STM32F7xx_files/stm32.jpg");

   write(conn, (const unsigned char*)(file.data), (size_t)file.len);

   fs_close(&file);

 }

 /* Check if request to get ST logo.jpeg */

 else if (strncmp((char *)recv_buffer,"GET /STM32F7xx_files/logo.jpg", 29) == 0)

 {

   fs_open(&file, "/STM32F7xx_files/logo.jpg");

   write(conn, (const unsigned char*)(file.data), (size_t)file.len);

   fs_close(&file);

 }

 else if(strncmp((char *)recv_buffer, "GET /STM32F7xxTASKS.html", 24) == 0)

 {

   /* Load dynamic page */

   DynWebPage(conn);

 }

 else if((strncmp((char *)recv_buffer, "GET /STM32F7xx.html", 19) == 0)||(strncmp((char *)recv_buffer, "GET / ", 6) == 0))

 {

   /* Load STM32F7xxpage */

   fs_open(&file, "/STM32F7xx.html");

   write(conn, (const unsigned char*)(file.data), (size_t)file.len);

   fs_close(&file);

 }

 else

 {

   /* Load 404 page */

   fs_open(&file, "/404.html");

   write(conn, (const unsigned char*)(file.data), (size_t)file.len);

   fs_close(&file);

 }

 /* Close connection socket */

 close(conn);

}

/**

 * @brief http server thread

 * @param arg: pointer on argument(not used here)

 * @retval None

 */

static void http_server_socket_thread(void *arg)

{

 int sock, newconn, size;

 struct sockaddr_in address, remotehost;

 int buflen = 1500;

 struct fs_file file;

 unsigned char recv_buffer[1500];

 /* create a TCP socket */

 if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)

 {

   return;

 }

 /* bind to port 80 at any interface */

 address.sin_family = AF_INET;

 address.sin_port = htons(80);

 address.sin_addr.s_addr = INADDR_ANY;

 if (bind(sock, (struct sockaddr *)&address, sizeof (address)) < 0)

 {

   return;

 }

 /* listen for incoming connections (TCP listen backlog = 5) */

 listen(sock, 5);

 size = sizeof(remotehost);

 while (1)

 {

   newconn = accept(sock, (struct sockaddr *)&remotehost, (socklen_t *)&size); 

   http_server_serve(newconn);

 }

}

and is there any STM example for websocket message transferring

I didn't find any STM example for LWIP for the STM32F407. If it there please provide the link

[sunil]

I found that problem in socket accept function

see the attach picture

it returns value newconn as -1 with listen(sock,5) and also listen(sock,8)

[sunil]