The very first post in the stickied https://gbatemp.net/threads/the-definitive-guide-to-wii-u-hacking.396828/
Just look for the caffiine section.
Edit: I misread and didn't see the SD part. If you want to get SDCaffiine to work on 5.4, you're going to have to port it first. As far as I'm aware, no one's ported it.
Your best bet is to just run the normal caffiine server.
well thats the problem
i seem to cant host files with my pc
netcafiine wont work when i run the server on my pc
also when i try to host files with hfs i cant reach my pcs ip with the wii u
so i pretty much need sdcafiine