Connect to broker over websocket

I have setup an esp32 with an openMqtt gateway and all working fine with controls using Home Assistant. It is connecting to my broker over the standard mqtt port 1883 with login and password. Now I have configured the broker so that it listens to websockets on port 9001 because I have other applications that are using websocket. Strangely, since this change of config on the broker, my esp32 is refused the connection on 1883. Is it possible to configure the openMqtt Gateway so it connects to the broker on websocket port 9001 ?

Changing ports is possible, but using WebSocket with Theengs software is not currently supported.