Ohai !
I have created with my group at school a small improvement to rarch to allow user to play with they smartphone and a raspberry pi. The objective of our project is to make old games more accessible for someone how don’t really know how to compile etc … 3 weeks ago we had a school’s forum with a lot of people (CEO, Students, Parents …) and we had a great success 
I see you coming, a gamepad on a smartphone it’s not nice etc … It’s a question of habits ! 
Now it works fine and we would like to merge that with rarch, but it’s not really “proper” and in rarch coding style.
https://github.com/pixl-project/RetroAr … smartphone
I think the first improvement is to create a new input driver, after I don’t really know.
If you have any questions, suggestions, or ideas don’t hesitate