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I agree with davinci.

Although I'm not sure, please try these:

rostopic echo /gazebo/cmd_vel rostopic echo /gz/cmd_vel rostopic echo cmd_vel

If you provide which robot you are trying to drive, we could help you more.

I agree with davinci.

Although I'm not sure, please try these:

rostopic echo /gazebo/cmd_vel
rostopic echo /gz/cmd_vel
rostopic echo cmd_vel

cmd_vel

If you provide which robot you are trying to drive, we could help you more.