ESP32 Forum

Posted: **Sun Sep 03, 2023 10:54 am**

i'm using a websocket server. I have initialized it following a tutorial. The websocket sends a timestamp every 3 seconds and receives text asynchronously. Sending is going very well. However, receiving print strange values or giving errors.

I'm using esp32s3.
esp-idf version 5.1.

I have used Postman to receive and send data. In addition of some extensions on Chrome.

I have used Wireshark to analyze the data. It shows that messages from ESP are not masked, and messages sending to ESP are masked.

My code as follow:

Code: Select all

tatic esp_err_t on_ws_url(httpd_req_t *r)
{
    ESP_LOGI("ES","URL: %s",r->uri);
    client_session_id = httpd_req_to_sockfd(r);
    websocket_closed = false;
    if(r->method == HTTP_GET){
        return ESP_OK;
    }
    
    httpd_ws_frame_t ws_pkt;
    memset(&ws_pkt,0,sizeof(httpd_ws_frame_t()));
    ws_pkt.type = HTTPD_WS_TYPE_TEXT;
    
    ws_pkt.payload = malloc(WS_MAX_SIZE);
    httpd_ws_recv_frame(r,&ws_pkt,WS_MAX_SIZE);
    
    printf("Web_socket: %.*s\n", ws_pkt.len,ws_pkt.payload);
    free(ws_pkt.payload);

Errors are:

Failed to read header byte (socket FD invalid), closing socket now
Failed to receive payload
httpd_ws_recv_frame: WS frame is not properly masked.

In the attachment is a screenshot of the random output, I'm sending the same message "hello".
So, it is a kind of random error.

I want to know if the problem is from my code or if it is from the library.
Any suggestions?

ESP32 Forum

Websocket is not properly reciving

Websocket is not properly reciving