reYmote is highly configurable. The configuration effort is the same as the possibilities: huge!
It may also require deep technical knowledge, depending on what you want to control and how. The "how" also depends on your equipment, how much money you want to spend and what technical skills you have (like electronics or programming).
So please keep in mind that this app may not be designed for you, before downrating the app.
Sadly, I had to stop development on reYmote. There will NOT be any new versions of this app. Sorry.