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00
In productionProintermediateLaunch composition

Commands go to the wrong topic

Fix the remap so velocity commands reach the base.

Pairs with Launch files and composition in Learn ROS 2 from the basics. Read the concept first, then diagnose it here.

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Operator report

The teleop publishes but the base never moves; commands land on an unread topic.

Ubuntu 24.04, ROS 2 Jazzy, rclpy, a single-package browser workspace

01

System boundary

Trace only the relevant path.

3 nodes
  1. 01remap rule→
  2. 02resolved topic→
  3. 03base subscriberOUT
02

How this lab works

You diagnose it. No command list.

Open the repair workspace and gather your own evidence in a real terminal. No diagnostic commands are handed to you - finding the fault is the exercise. Stuck? Progressive hints unlock inside the workspace.

03

Verification

Pass more than the visible symptom.

4 checks
  • cmd_vel resolves correctly
  • The base receives commands
  • Hidden regression behavior
  • Root cause explanation