Inspect a Launched System

Launching successfully means processes started.

It does not automatically prove the system has the graph you intended.

Diagrams open at a readable shape-aware scale. Zoom or expand when you need more detail.

Build an inspection routine

After:

ros2 launch robotnix_pubsub student_system.launch.py

open another sourced terminal and run:

ros2 node list
ros2 topic list -t
ros2 topic info /student_chatter --verbose

If you use namespaces/remaps, inspect the resolved topic instead.

Compare launch intent to runtime evidence

Create:

Use rqt_graph when helpful

The official launch tutorial demonstrates visualizing a launched Turtlesim system with rqt_graph.

For your two-node package, either graph view or CLI evidence is enough if it proves the same relationship.

Checkpoint

What evidence would catch a launch file that successfully started both nodes but accidentally remapped the listener to the wrong topic?