Connect to x11vnc from mobile app and run viewer vnc on it

[MSqt]

Hi guys,
I'm new of qt, my target is connect to board imx6, where installed on it the x11vnc.
Well, I've downloaded vnc client from appstore and play store and it works.
Now, my problem is, I've searched online, but i didn't found any documentation to connect with the server from mobile app.
There is a documentation ?
I've tryed this: http://amin-ahmadi.com/2016/09/23/full-featured-vnc-client-widget-for-qt/
connect but the video frame don't work.
I don't understand how to connect to x11vnc with qt, and see remote display.

Could you help me ? Could you explain me ?

Thanks.