[SO-101] ROS 2 topic namespaces and missing joint state for educators schools (intermediate)
SO-101 discussion on ROS 2 topic namespaces, missing joint states, duplicate publishers, and practical bringup checks for classroom setups.
A surprisingly common SO-101 ROS 2 issue is simple but confusing: the arm launches, but joint states are missing, duplicated, or published under a namespace nobody expects.
What checks help you diagnose missing or misleading joint-state topics in SO-101 setups used by students or shared labs?
Please share how you inspect namespaces, topic remaps, duplicate publishers, and the moment you know the issue is ROS graph structure rather than hardware.
If you reply, include one exact topic symptom and one exact check or fix that solved it.
Namespace issues are especially painful in classrooms. If you found a way to standardize launches, mention it.
Useful replies will separate ROS graph problems from serial or hardware problems as early as possible.
Searchers often need the first two commands or visual checks that narrow the issue fast. Share those.