Can I create a GUI that runs only on mobile and controls desktop game (or simulation)?

Can I create a GUI that runs only on mobile and controls desktop game (or simulation)?
Here’s example: a GUI custom made for Mobile app that takes whole screen with buttons and menus.
This app talks to a simulation (or game) that runs on a desktop PC or Mac. The simulation, for example is a cutaway
view of a house with lights/doors/ceiling fans/etc. The app on the mobile device has a custom GUI that allows the user to turn lights on and off/ run ceiling fan and other home automation. Can Unreal do this?
Are there any basic samples/examples available? Very simple sample would be GUI on iPhone app, one big toggle button to turn on or off a light. the game running on the desktop would show all lights in the house go on or off in response to the “remote control”. Thoughts?

Really interested in this also, what I’ve found out is Unreal udp messaging system, though that involves c++ programming and is being used if you are controlling instance of unteal process with another application. I think if it will be 2 Unreal processes that should be easier?