ROSTOPIC publish every 1 second a new data

asked 2020-04-26 17:12:17 -0500

Primo
5 ●3 ●5 ●5

Hey all,

I would like to publish a rostopic that countains a certain data every 1 second, and i would like that the data change in every publish. Maybe read from a text file and publish line by line every 1 second or publish the output from a math function ... How can i do that ? I'm only using a cmd like this (rostopic pub my_topic std_msgs/String "hello there") and i can't figure it out, i've being looking for a solution online but couldn't find it. Please help me.

Thank you.

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answered 2020-04-27 04:21:25 -0500

gvdhoorn
86574 ●283 ●1432 ●1054 http://cor.tudelft.nl/

I would like to publish a rostopic that countains a certain data every 1 second [..] I'm only using a cmd like this (rostopic pub my_topic std_msgs/String "hello there")

This is not something rostopic is designed for.

You'll have to write a node for this.

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answered 2020-04-27 08:45:43 -0500

Thomas D

4347 ●33 ●65 ●86 http://denewiler.us/cv

I agree with @gvdhoorn that the best way to do this is probably with a node using a Timer (roscpp, rospy). An alternative is to use ROS GUI as in the ros_control tutorial (look for the section "Use RQT To Send Commands").

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