How to write plugin for wii u?

Hello,
This is my first post on this forum and I am a quite new user of Unity. I have read up on writing plugins for Unity (taking dll-files with C+±code and integrate it in your project). I found information on how to do it for Windows, iOS. But no information on how to write for Nintendo Wii U. Does someone know how to do this, or can point me to some place where I can get information about it?
Thanks in advance.

kind regards,
smile83

Bump up I want to know this as well.
Thank you.

You need to be a nintendo developer to get there Unity plugins and such
https://wiiu-developers.nintendo.com/#