MAVLink System ID and Component ID

Contents

MAVLink System ID and Component ID#

Overview#

Each system in the MAVLink network must have unique system ID, and each component within a system must have unique component ID. The ID are used to address a message to a particular system/ component and also used to message routing when components are on different network interfaces.

The pixhawk device or the FCU have a default system ID of 1, GCS like QGroundControl use a default system ID of 255, and MAVLink SDKs use an ID in the middle of the range. This unique system id ensures no message conflict.

FCU Parameters:

SYSID_THISMAV = 1
SYSID_MYGCS = 255

MAVROS is also a system of its own in the MAVLink network, so it needs a unique system ID. In our case, NO, we don't use different system ID. We want our MAVROS to act like GCS, so we set system ID of 255 to MAVROS node (or the same as SYSID_MYGCS value we set). ManualControl message needs GCS system ID to works.