An autonomous drone system heavily depends on the lightning-fast data exchange between high-level decision-making hardware (like a Raspberry Pi or Jetson) and low-level flight control hardware (like a Pixhawk running PX4). Today we are breaking down the communication process in autonomous drones. MAVLink is a message-based protocol designed to stream data continuously without freezing—even over weak radio signals. In this video, we pull back the curtain using PX4 SITL (Software in the Loop) to show you exactly how PX4 opens ports and handles data streaming.