Xentrk
Part of the Furniture
I have been searching the web for Raspberry Pi 3 projects. I came across this interesting project that allows one to install code on the PI to use is as an IDS. The coder has a wiki with instructions. It appears that it will work with ASUS-Merlin Firmware AFAIK.
https://github.com/musicmancorley/BriarIDS/wiki
https://github.com/musicmancorley/BriarIDS/wiki