The RC-car controlled in any chromium-based web browser using a gamepad. Raspberry Pi 4 is mounted on the car, has a 4G modem, powerbank and Camera Module 3 attached. It connects via WebRTC which is P2P (peer to peer) to ensure low latency. PI is tapped into car's wires and uses PWN (Pulse Width Modulation) to control it's motor and sterring.
... will be updated soon