This is an error report.
Screenshot of the error
Error details
In section 3.2, following the instructions does not result in chatter messages being echoed when using "ros2 topic echo /chatter"
Hi @jkel.1996 ,
Welcome to this Community!
It is working fine for me I tested it just now.
I think you are not following instructions properly.
Subscribers do not print out any messages unless any topic publishes to that subscription topic.
Please read the instructions carefully:
- You need to start the bridge.
- You need to subscribe to ROS2 topic.
- You then publish into the Gazebo topic with a Publisher.
EDIT: THIS IS NOT A BUG !
This is the way the course is designed.
Not every single command will immediately produce an output on the screen.
Regards,
Girish
Hi thank you for your prompt reply.
I understand that nothing will be received by the subscriber when I run “ros2 topic echo /chatter” unless another node is first publishing to /chatter.
I was required to submit a screenshot of the error and couldn’t take one with all 3 terminals visible simultaneously.
Interesting that it is working for you, because when I ran the gz topic publisher on the /chatter topic. I did not see anything echo-ed in ROS. I will try again later.
Hi @ girishkumar.kannan,
I just tried to run the example again. I am not sure why it is not working for me.
Here are some screenshots. Would like to know what I am doing wrong because I am copying and pasting the instructions.
I also tried changing the message type from ignition.msgs.StringMsg to gz.msgs.StringMsg after getting deprecated warnings.
I can only upload 1 image at a time, I will include 2 more in 2 following replies.
Hi @jkel.1996 ,
Thanks for the pictures. You can attach more than one picture in a single post (just copy-paste the picture one after another, rather than attaching a picture).
Your issue seems to be weird. I guess there is some glitch in the course VM or backend or bashrc file.
I will try to see if I can replicate your issue and give you a solution.
Regards,
Girish
Dear @girishkumar.kannan,
Thank you again for your prompt response.
I tried on my local machine and the parameter bridge does not seem to work for my binary installation of ros_gz via sudo apt install ros-humble-ros-gz as well. However, it does work for a source installed version of the package.
I’m not sure why the debian package is not working though.
Oh, apparently I am a new user, that’s why I am not allowed to upload multiple pictures simultaneously.
Hi @jkel.1996 ,
Yes, that could be the issue. Thanks for bringing that to notice.
Ah, I see. You need to get these two badges: Basic Badge and Read Guidelines Badge
Regards,
Girish
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