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.

How to publish custom topic from command line

asked 2020-11-18 12:33:07 -0600

Marcus Barnet
277 ●63 ●74 ●83

Hi to all,

I have a ROS Node that uses custom messages:

//robo_io.msg
bool out_0
bool out_1
int64 var1

I publish them from my node in C++ in this way:

var_pub = n.advertise<robo_explorer::robo_io>("/robo_explorer/io_status, 1000);

and it works very well!

The problem is that I would like to send some messages by using the terminal, but I'm having problems with the syntax to use.

I tried with:

rostopic pub /robo_explorer/io_status std_msgs/Bool "out_1: true"

but it says that there is no field name out_1.

Can you help, me?

Thank you!

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

answered 2020-11-18 12:43:53 -0600

chfritz

553 ●2 ●48 ●18 https://luminrobotics.com

To publish on a topic you need to use the topic type of that topic (just like you are doing in C++).

rostopic pub /robo_explorer/io_status robo_explorer/robo_io "{ out_1: true }"

Assuming that's the namespace and name of your custom message and you've sourced your workspace in the current shell (so that rostopic can find the custom message definition).

edit flag offensive delete link

Comments

Additionally, you should be able to use tab completion after typing rostopic pub /robo_explorer/io_status, and it will automagically fill in both the message type and then the correct syntax to specify the values.