I rectify: $ ./backend 9 eth0
and: $ ./backend 1 ESSID PWDin /usr/lib/simple-netaid/bin. You can run it without root permissions, because simple-netaid uses SUID.
Another clarification:The kernel 4.x of Gnuinos still doesn't work in live mode, because aufs4-standalone module is not included. I tried it in august, but some backports like kernel-wedge and gcc are needed for that, i think.