Property: org.zkoss.zkmax.au.websocket.WebSocketEndPoint.pingIntervalSecond

Default: 0 (Turned off)
[Since 9.5.0]

Default: 25 (Turned on)
It means the http session will keep alive during the ping and pong mechanism until the user closes the browser tab or navigates to another browser page.
[Since 9.6.1]

It specifies the interval in second of the ping mechanism described in RFC 6455 when WebSocket connection is enabled.

Only works when WebSocket connection is enabled.