This repository contains a set of packages that primarily contain interface files (.msg and .srv) which are used both to implement client library concepts and for testing.
- action_msgs: Messages and services for ROS 2 actions
- builtin_interfaces: Message definitions for types in the OMG IDL Platform Specific Model
- composition_interfaces: Services for managing composeable nodes.
- lifecycle_msgs: Message and service definitions for managing lifecycle nodes.
- rcl_interfaces: Message and service definitions for ROS client libraries
- rosgraph_msgs: Message definitions relating the ROS Computation Graph
- test_msgs: Used exclusively for testing purposes