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why is /teleop/cmd_vel not return the same type as /cmd_vel ?
cmd_vel
user:~$ rostopic info cmd_vel
Type: geometry_msgs/Twist
Publishers: None
Subscribers:
* /cmd_vel_mux (http://2_simulation:38303/)
* /gazebo (http://2_simulation:34189/)
/teleop/cmd_vel
user:~$ rostopic info /teleop/cmd_vel
Type: unknown type
Publishers: None
Subscribers:
* /cmd_vel_mux (http://2_simulation:38303/
The message type that's carried by a topic depends on the publisher. cmd_vel isn't a special topic but is rather a convention used by many ROS developers. And remember, a topic can be subscribed to without anything publishing to it which is probably why you get Type: unknown type for the /teleop/cmd_vel topic.
Asked: 2020-12-12 12:20:48 -0500
Seen: 208 times
Last updated: Dec 12 '20
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