This is a dirt simple application that implements the bare minimum network protocol required for the FRC Driver Station to believe it has connected to a RoboRIO. This tool is helpful when working on FMS network code without having to actually connect to a robot to tell if things are working.
Attach an interface to your machine of 10.TE.AM.2. Then run npm start in this directory. The driver station will now show "Teleoperated Disabled", as if it is connected to a real robot.