Need a app to run in background & remote control my android with topic

Should be free. Also teamviewer doesn't work for this. You have to manually authenticate connections to it on your android device. The app should simply run in the background without using many resources until it gets a request to use its screen.

Would also highly prefer it runs or has a lan-preferred mode so I can use it with less battery resources and far lower latency than I would having to transfer things over the internet