I once did something similar for car wash doors. there's a car wash door company out there that has a control panel accessible over VNC and uses the same defaults for every one they set up, so I used to connect to random ones and open and shut the car wash doors for the fun of it. The best part was when someone noticed and tried to shut it only for me to open it again, resulting in a battle where neither of us knew anything more than someone or something keeps undoing my actions