Hi,
I start playing with my kids RC car, adding to it control using Omega2. I decided to develop most of the functions using Php just for fun and because i don't se many people here using it 
I have reused and modified libraries i have found all around web.
Principle is simple. Php script on omega is running as daemon communicating with browser via web socket. In browser - open Html (served from omega2) and use touch screen of your mobile to point direction + speed by moving your finger up, down left right . If you run webcam on omega, you can get video feed over screen and controls are still working.
I still need to write details and how did I wire it If somebody is interested you can check at: Github. Be aware, it's still just working demo. It works, my kids are playing with it, but still, i did not clean up code.