Services versus actions
22 min · IntermediateUnderstand the concept
Services express request-response operations; actions support longer tasks with feedback and result. Choosing the right contract prevents unclear cancellation and lifecycle behavior.
Read the associated publisher material for deeper derivations, lectures and problem sets. This summary is an independent Harderware explanation.
Your exercise
Propose one example of a service and one of an action for a mobile robot.
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 is a better fit for a long navigation task with progress feedback?
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