Guided beta caseProbeginnerCommand interface
The controller loads but cannot activate
Expose the required interface without weakening controller validation.
Pairs with ros2_control interfaces in Hardware Integration & CANopen. Read the concept first, then diagnose it here.
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`diff_drive_controller` is loaded but activation fails with missing `left_wheel_joint/velocity`.
Ubuntu 24.04, ROS 2 Jazzy, SocketCAN vcan, CANopen drive simulator, ros2_control
System boundary
Trace only the relevant path.
hardware interface exportcontroller resource claimwheel command
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.
Verification
Your repair must pass more than the visible symptom.
- Controller activates
- Velocity interfaces are claimed
- Hidden regression behavior
- Root cause explanation