Pricing
00
In productionProbeginnerSocketCAN state

The CAN device exists but sends nothing

Bring the configured interface online without changing the application.

Pairs with SocketCAN and bus diagnostics in Hardware Integration & CANopen. Read the concept first, then diagnose it here.

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Operator report

`can0` appears in `ip link`, but transmit calls return network is down.

Ubuntu 24.04, ROS 2 Jazzy, SocketCAN vcan, CANopen drive simulator, ros2_control

01

System boundary

Trace only the relevant path.

3 nodes
  1. 01Linux can0 device→
  2. 02link state→
  3. 03CAN applicationOUT
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
  • Interface is UP
  • Heartbeat frames receive
  • Hidden regression behavior
  • Root cause explanation