Merge branch 'bugfix/fix_ws_handle_big_messages_error_v4.2' into 'release/v4.2'

esp_http_server: Fix ws server handle length over 1440(MTU) messages incorrectly(backport v4.2).

See merge request espressif/esp-idf!14345

components/esp_http_server/src/httpd_ws.c

@@ -250,9 +250,15 @@ esp_err_t httpd_ws_recv_frame(httpd_req_t *req, httpd_ws_frame_t *frame, size_t
         return ESP_FAIL;
     }
 
-    if (httpd_recv_with_opt(req, (char *)frame->payload, frame->len, false) <= 0) {
-        ESP_LOGW(TAG, LOG_FMT("Failed to receive payload"));
-        return ESP_FAIL;
+    int read_len = 0, left_len = frame->len;
+    while (left_len > 0) {
+        if ((read_len = httpd_recv_with_opt(req, (char *)frame->payload + read_len, left_len, false)) <= 0) {
+            ESP_LOGW(TAG, LOG_FMT("Failed to receive payload"));
+            return ESP_FAIL;
+        }
+        if (left_len -= read_len) {
+            ESP_LOGD(TAG, "recv data length is less than the data length we want. Read again!");
+        }
     }
 
     /* Unmask payload */