Link https://docs.ros.org/en/foxy/Tutorials/Beginner-CLI-Tools/Understanding-ROS2-Topics/Understanding-ROS2-Topics.html Understanding topics — ROS 2 Documentation: Foxy documentation You're reading the documentation for an older, but still supported, version of ROS 2. For information on the latest version, please have a look at Humble. Understanding topics Goal: Use rqt_graph and command line to..