This package contains ROS2 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.

Homepage:
https://github.com/rcl_interfaces/
