rosidl is one of the ros_core packages. See documentation for details of this package.

• rosidl_adapter
  • API and scripts to parse .msg/.srv/.action files and convert them to .idl
• rosidl_cmake
  • CMake functionality to invoke code generation for ROS interface files
• rosidl_generator_c
  • Generate the ROS interfaces in C
• rosidl_generator_cpp
  • Generate the ROS interfaces in C++
• rosidl_parser
  • Parser for .idl ROS interface files
• rosidl_runtime_c
  • Provides definitions, initialization and finalization functions, and macros for getting and working with rosidl typesupport types in C
• rosidl_runtime_cpp
  • Provides definitions and templated functions for getting and working with rosidl typesupport types in C++
• rosidl_typesupport_interface
  • Interface for rosidl typesupport packages
• rosidl_typesupport_introspection_c
  • Generate the message type support for dynamic message construction in C
• rosidl_typesupport_introspection_cpp
  • Generate the message type support for dynamic message construction in C++