Attention: Answers.ros.org is deprecated as of August the 11th, 2023. Please visit robotics.stackexchange.com to ask a new question. This site will remain online in read-only mode during the transition and into the foreseeable future. Selected questions and answers have been migrated, and redirects have been put in place to direct users to the corresponding questions on Robotics Stack Exchange. Additional details are available here.

Understanding Parameters - Changing & Using New Value On The Fly

asked 2022-03-01 09:23:45 -0500

Green01
25 ●4 ●5 ●10

I am new to ROS. I am using Python 3 and ROS Noetic on Ubuntu 20.04. I need help understanding parameters.

Currently, I use a launch file to set parameters and in the C++ publisher code I do a getParam to get the value of the parameter from the Parameter Server. This works fine.

Now, I want to create a rqt GUI and from the GUI change the value of a parameter, get the new value in the publisher code and act on it, without restarting the Parameter server or publisher.

Can I do this with setParam() and getParam()? I've read some about dynamic_reconfigure. Is that what I need to use rather than setParam()/getParam()?

Any help getting me started in the right direction is appreciated!

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

answered 2022-03-01 09:57:55 -0500

Delb

3907 ●16 ●105 ●68

If you want to change parameters values during the node execution then yes dynamic_reconfigure is what you are looking for. Moreover you have the package rqt_reconfigure creating the GUI for you.

You should check #q175010 comparing server parameters and dynamic reconfigure.

edit flag offensive delete link

Comments

Thanks for the feedback. That is a helpful link to the question comparing server parameters and dynamic reconfigure as I hadn't found that question in my searches.

Green01 ( 2022-03-01 12:26:43 -0500 )edit

add a comment

Question Tools

1 follower

Stats

Asked: 2022-03-01 09:23:45 -0500

Seen: 212 times

Last updated: Mar 01 '22

Understanding Parameters - Changing & Using New Value On The Fly edit

1 Answer

Comments

Question Tools

Stats

Related questions

Understanding Parameters - Changing & Using New Value On The Fly