Connect devices (iOS & Android) to VNC Server and mirror display

I've a problem, I'm not an expert of VNC but, i've installed http://www.karlrunge.com/x11vnc/ on rasperry, and connect him to display.

Now, I'get the display mirroring thought vnc, but I didn't found documents about connect to VNC Server. My target is write code from QT Cross Platform, connect on VNC server on rasperry and start mirroring on client devices (tablet or smartphone - iOS & Android). Exist the documentations to do that ?

Thanks