What is MAVLink Message Heartbeat: Explanation and Example

The MAVLink message HEARTBEAT is a regular signal sent by drones or ground stations to announce their presence and status. It acts like a "hello" message that lets other devices know the drone is active and ready to communicate.

How It Works

The MAVLink HEARTBEAT message works like a friendly wave between drones and ground control stations. Imagine you are in a group chat and you send a quick "I'm here" message every few seconds so everyone knows you are still connected. This message contains important info like the drone's type, mode, and system status.

When a drone sends a heartbeat, other devices listening can confirm it is alive and check its current state. If the heartbeat stops, it’s like losing contact, signaling a possible problem or disconnection. This helps keep communication safe and reliable during flight.

Example

This example shows how to create and print a MAVLink HEARTBEAT message using Python with the pymavlink library. It simulates sending a heartbeat from a drone.

python

from pymavlink import mavutil

# Create a connection (dummy for example)
master = mavutil.mavlink_connection('udpout:localhost:14550')

# Create a heartbeat message
master.mav.heartbeat_send(
    type=mavutil.mavlink.MAV_TYPE_QUADROTOR,  # Drone type
    autopilot=mavutil.mavlink.MAV_AUTOPILOT_ARDUPILOTMEGA,  # Autopilot type
    base_mode=0,  # Current mode
    custom_mode=0,  # Custom mode
    system_status=mavutil.mavlink.MAV_STATE_ACTIVE  # System status
)

print('Heartbeat message sent')

Output

Heartbeat message sent

When to Use

Use the MAVLink HEARTBEAT message whenever you want to confirm that a drone or ground station is active and communicating. It is essential during flight to monitor drone health and connection status.

For example, ground control software listens for heartbeat messages to track drones in real time. If heartbeats stop, the software can alert the operator or trigger safety procedures. It is also used in drone swarms to keep all units aware of each other.

Key Points

• The HEARTBEAT message is a simple "I'm alive" signal sent regularly.
• It includes drone type, autopilot, mode, and status info.
• Other devices use it to check connection and drone health.
• Missing heartbeats can indicate communication loss or failure.

Key Takeaways

The MAVLink HEARTBEAT message signals a drone's presence and status regularly.

It helps ground stations and other drones know the system is active and healthy.

Missing heartbeat messages can trigger alerts or safety actions.

Use it to maintain reliable communication during drone operations.