ROS2 Services — Complete Guide for Robotics
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ROS2 services are synchronous request/response calls between nodes — used for short, infrequent commands like calibration or mode changes.
The concept concept: ROS2 services are synchronous request/response calls between nodes
Difficulty 3/5 · ClassroomA ROS2 service is a synchronous remote procedure call between nodes. A client sends a request with typed data; the server processes it and returns a response. Unlike topics, services are 1-to-1 and wait for an answer.
💡 Think of it like…
Think of it like a household object that does the same job — the underlying idea is the same, just adapted for robots.
Why it matters
Without ros2 services — complete guide for robotics, many concept systems in robotics simply couldn't work.
ROS2 Services
What is it?
A ROS2 service is a synchronous remote procedure call between nodes. A client sends a request with typed data; the server processes it and returns a response. Unlike topics, services are 1-to-1 and wait for an answer.
How it works
Each service has a name and a service type (defining request/response fields). The server node advertises the service; clients call it. The call blocks (or awaits, in async clients) until a response is received or the timeout fires. Internally, services also run on DDS but use a request/response pattern.
Real-world example
A robot might expose /save_map as a service so an operator can save the current SLAM map. /set_parameters is a built-in service every ROS2 node provides. Calibration, mode switches, and teleop arming commonly use services.
Why it matters for robotics
Services are perfect for short, infrequent commands where you need a yes/no answer. Misusing topics for what should be a service is a common ROS2 anti-pattern.
See also
Ask R2 Co-pilot anything you didn't understand about ROS2 Services — Complete Guide for Robotics. It'll explain it plainly.
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Last updated · 2026-05-21
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