How to establish TCP client's limit in tcp server socket in ESP32?

[MiguelBailonS]

Hi,
I am using lwip/sockets.h library to create a TCP Server
to handle just one TCP client connection.
In listen() function I set the amount of TCP clients in queue to
to 0.
But, when I initiate the TCP Server, and try to connect with two TCP clients
at the same time with hercules TCP Client, I get both of them connected to my
TCP Server.

How can I handle this event to just get one of them connected?

I am using an freeRTOS task to set up my TCP server, and then
in the while loop, i used the blocking function: accept().
The while loop doesnt have a delay to execute, but even with a delay
it doesnt work the way I want.

Thank you for your time.

[ESP_Sprite]

Your capslock seems to have been accidentally stuck on while typing the title of this topic. I took the liberty to correct that for you. Also, can you post your code somewhere? Your description isn't super clear.

[MiguelBailonS]

Code: [Select all] [Expand/Collapse]

1.     err = listen(listen_sock, 1); // listen() function
2.     if (err != 0) {
3.         ESP_LOGE(TAG, "Error occurred during listen: errno %d", errno);
4.         goto CLEAN_UP;
5.     }
6.  
7.     while (1) { // while of freeRTOS task without delay
8.         struct sockaddr_storage source_addr; // Large enough for both IPv4 or IPv6
9.         uint addr_len = sizeof(source_addr);
10.         int sock = accept(listen_sock, (struct sockaddr *)&source_addr, &addr_len);
11.         if (sock < 0) {
12.             ESP_LOGE(TAG, "Unable to accept connection: errno %d", errno);
13.             break;
14.         }
15.  
16.         // Convert ip address to string
17.         if (source_addr.ss_family == PF_INET) {
18.             inet_ntoa_r(((struct sockaddr_in *)&source_addr)->sin_addr, addr_str, sizeof(addr_str) - 1);
19.         } else if (source_addr.ss_family == PF_INET6) {
20.             inet6_ntoa_r(((struct sockaddr_in6 *)&source_addr)->sin6_addr, addr_str, sizeof(addr_str) - 1);
21.         }
22.         ESP_LOGI(TAG, "Socket accepted ip address: %s", addr_str);
23.         do_retransmit(sock);
24.        
25.         shutdown(sock, 0);
26.         close(sock);
27.     }
28.  
29. CLEAN_UP:
30.     close(listen_sock);
31.     vTaskDelete(NULL);
32. }

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Here is the code, thanks for your correction.