ROS 2 nodes and topics
22 min · IntermediateUnderstand the concept
ROS 2 components exchange typed messages using interfaces such as topics, services and actions. A node is an executable participant in a graph. Interfaces should remain explicit and versioned.
Read the associated publisher material for deeper derivations, lectures and problem sets. This summary is an independent Harderware explanation.
Your exercise
Sketch a sensor node publishing a message to a visualization node. Identify the message contract.
Practice in simulation or at safe low voltage unless supervised by qualified personnel. Follow official equipment safety guidance.
Record your engineering notes
Capture a hypothesis, your observations, test evidence, failure cases or the next experiment. These notes stay in your browser unless you export them.
Knowledge check
Which ROS mechanism commonly supports a stream of sensor readings?
Practice quizzes are formative and can be retried. Answers are evaluated in your browser; they are not proctored exams.