IoT Websocket connection failed

Hi,

I cannot connect successfully via ESP8266 NodeMCU to the sgcWebSocketHTTPServer using websocket.
Websocket client module support implements RFC6455 (version 13) and fragmented messages.
Documentation: https://nodemcu.readthedocs.io/en/release/modules/websocket/

When the device connects to the server, it receives an error in ServerError event:
Error Protocol: chat not supported.

Can it be improved somehow?

Best Regards
Piotr