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Sadly I don't have much experience with this, but I would start by looking how the panda and UR repositories did it.

Other debug directions to check:
- Are you sure that the topic the action advertises on is correct?
- Are the namespaces right?
- What is the launch file you use to start up your dummy follow_joint_trajectory server?
- What's the output of rostopic list after you start it up?
- Does the move_group node say anything helpful if you set the logger level to debug via rosrun rqt_logger_level rqt_logger_level?

Sadly I don't have much experience with this, but I would start by looking at how the panda and UR repositories did it.

Other debug directions to check:
- Are you sure that the topic the action advertises on is correct?
- Are the namespaces right?
- What is the launch file you use to start up your dummy follow_joint_trajectory server?
- What's the output of rostopic list after you start it up?
- Does the move_group node say anything helpful if you set the logger level to debug via rosrun rqt_logger_level rqt_logger_level?