spiegeleixxl/android-nativebinaryexecution — comment on commit 2bdfd4c35df61353ece564d9a3ab9cbc6f164e27
File:  line 0
By spiegeleixxl:

Hello.
"su" is a interactive shell command, hence you'd need to make something like a global living "shell" in the background to interact with it. I'd suggest you use the SuperUser app to grant it root access. This may require some more reworking of Gimite's original code to make it act like a shell.

Best