Introduction to ROS Part 2 - Getting Started with ROS 2 Services and Topics

Learn to interact with ROS 2 nodes, topics, and services using command-line tools in this 40-minute hands-on tutorial from Digi-Key's robotics series. Master the fundamentals of ROS node architecture and package structure before diving into practical exercises using a Docker-based ROS 2 Jazzy Jalisco environment. Explore built-in publisher and subscriber nodes, inspect topics with ros2 topic list, and monitor real-time data transmission using ros2 topic echo. Discover how to interact with ROS services by launching service servers, making CLI calls, and inspecting message types with ros2 interface show, while observing seamless communication between Python and C++ nodes. Utilize rqt_graph, a powerful graphical visualization tool, to display node and topic connections in real time for effective debugging and system understanding. Gain essential terminal navigation skills for testing ROS 2 applications and build the foundation needed for creating custom nodes in future episodes, all while working with practical examples that demonstrate the flexibility of ROS 2's messaging system across different programming languages.