So far as I understand, if you want a mech that doesn't have a person in there, you have two options, drones, or autonomous robots.
Drones require constant connection with their controller, Any ECM in the equation and they freeze.
Robotic units like the Lich or Revenant, which basically do their own thing, based on a limited instruction set, Interstellar Ops 154.
Is there anything in between? Is there a system where I can give two unmanned mech orders like "recon to the North," or "proceed to way point," and they will do that job, regardless intervening ECM(I know the bots themselves won't work properly if in and ECM field). Then if they encounter something interesting, I take direct control of one unit?