Hey! So I finally made a small library which you can implement into your wii homebrew application in order to use the WiiU Pro Controller, I've added a usage.txt file to it. https://github.com/FIX94/libwupc Just check out the source to get all the data you need. Let me know if you find any issues with it, so far I only tested it with one controller so I have no idea if it can even handle multiple controllers properly. This library is implemented for example into wiiflow, nintendont, postloader, fceugx, snes9xgx and vbagx (get those 3 from my signature). Have Fun!