This is a nintendo-switch sysmodule which runs an ftpd-server in the background (on port 5000 with no auth).
The ftpd is basically copy paste from this ftpd-fork.
Put the contents of the sd_card folder in the root of your sd-card or else the sound effects won't work!
Sound effects from:
https://freesound.org/people/jens.enk/sounds/434610/
https://freesound.org/people/jens.enk/sounds/434611/
https://freesound.org/people/rhodesmas/sounds/322897/
https://freesound.org/people/rhodesmas/sounds/322895/