Frequently when using Web Sockets you will get the assert failure:
assertion "new_rcv_ann_wnd <= 0xffff" failed: file "/Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/lwip/lwip/src/core/tcp.c", line 779, function: tcp_update_rcv_ann_wnd
This will happen particulary when you close the browser window. This change
prevents the issue from occuring.