Inspect Action Clients and Servers

With Turtlesim and teleop running, ask the graph about actions.

List actions

ros2 action list

The official tutorial shows:

/turtle1/rotate_absolute

Show types too:

ros2 action list -t

Ask for the type

ros2 action type /turtle1/rotate_absolute

Expected type:

turtlesim/action/RotateAbsolute

Inspect clients and servers

ros2 action info /turtle1/rotate_absolute

The tutorial identifies teleop as an action client and Turtlesim as the server.

You can cross-check from each node:

ros2 node info /turtlesim
ros2 node info /teleop_turtle

Read the action interface

ros2 interface show turtlesim/action/RotateAbsolute

The three sections correspond to goal, result, and feedback.

Checkpoint

Create an action card:

Action name:
Type:
Client node:
Server node:
Goal field(s):
Result field(s):
Feedback field(s):