# \[Bug\] Ignition to ROS Bridge not working **URL:** \ **Category:** Introduction to Gazebo Sim with ROS2\ **Created:** [February 23, 2024, 7:54am UTC](https://get-help.theconstruct.ai/t/bug-ignition-to-ros-bridge-not-working/29040 "2024-02-23T07:54:44Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![jkel.1996](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/jkel.1996/32/6967_2.png) [@jkel.1996](https://get-help.theconstruct.ai/u/jkel.1996)\ **Post date:** [February 23, 2024, 7:54am UTC](https://get-help.theconstruct.ai/t/bug-ignition-to-ros-bridge-not-working/29040/1 "2024-02-23T07:54:45Z")
This is an error report. * * * **Screenshot of the error** ![](https://get-help.robotigniteacademy.com/uploads/default/original/2X/b/b0d06739736b2f0a1b0ca22aab2163f4603cc4f5.jpeg) * * * **Error details** In section 3.2, following the instructions does not result in chatter messages being echoed when using "ros2 topic echo /chatter" ---
**Author:** ![girishkumar.kannan](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/girishkumar.kannan/32/6994_2.png) [@girishkumar.kannan](https://get-help.theconstruct.ai/u/girishkumar.kannan)\ **Post date:** [February 23, 2024, 8:08am UTC](https://get-help.theconstruct.ai/t/bug-ignition-to-ros-bridge-not-working/29040/3 "2024-02-23T08:08:20Z")
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: 1. You need to start the bridge. 2. You need to subscribe to ROS2 topic. 3. 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 ---
**Author:** ![jkel.1996](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/jkel.1996/32/6967_2.png) [@jkel.1996](https://get-help.theconstruct.ai/u/jkel.1996)\ **Post date:** [February 23, 2024, 9:48am UTC](https://get-help.theconstruct.ai/t/bug-ignition-to-ros-bridge-not-working/29040/4 "2024-02-23T09:48:45Z")
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. ---
**Author:** ![jkel.1996](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/jkel.1996/32/6967_2.png) [@jkel.1996](https://get-help.theconstruct.ai/u/jkel.1996)\ **Post date:** [February 26, 2024, 3:07am UTC](https://get-help.theconstruct.ai/t/bug-ignition-to-ros-bridge-not-working/29040/5 "2024-02-26T03:07:01Z")
Hi @ [girishkumar.kannan](https://get-help.robotigniteacademy.com/t/bug-ignition-to-ros-bridge-not-working/29040/3), 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. ![Screenshot from 2024-02-26 11-04-31](https://get-help.robotigniteacademy.com/uploads/default/original/2X/8/8fdfa15de0c5afa60cf0576e3102bc1918b018f4.png) I can only upload 1 image at a time, I will include 2 more in 2 following replies. ---
**Author:** ![jkel.1996](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/jkel.1996/32/6967_2.png) [@jkel.1996](https://get-help.theconstruct.ai/u/jkel.1996)\ **Post date:** [February 26, 2024, 3:07am UTC](https://get-help.theconstruct.ai/t/bug-ignition-to-ros-bridge-not-working/29040/6 "2024-02-26T03:07:32Z")
ros2 topic echo /chatter screenshot. ![Screenshot from 2024-02-26 11-04-35](https://get-help.robotigniteacademy.com/uploads/default/original/2X/e/ead0cb0be9028a36b832e1b225f84cc756381987.png) ---
**Author:** ![jkel.1996](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/jkel.1996/32/6967_2.png) [@jkel.1996](https://get-help.theconstruct.ai/u/jkel.1996)\ **Post date:** [February 26, 2024, 3:08am UTC](https://get-help.theconstruct.ai/t/bug-ignition-to-ros-bridge-not-working/29040/7 "2024-02-26T03:08:19Z")
gz topic -t /chatter -m… screenshot. ![Screenshot from 2024-02-26 11-04-39](https://get-help.robotigniteacademy.com/uploads/default/original/2X/8/8f908a4c0df1e2f12138239ec8f1ff7a2d40188f.png) ---
**Author:** ![girishkumar.kannan](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/girishkumar.kannan/32/6994_2.png) [@girishkumar.kannan](https://get-help.theconstruct.ai/u/girishkumar.kannan)\ **Post date:** [February 26, 2024, 5:31am UTC](https://get-help.theconstruct.ai/t/bug-ignition-to-ros-bridge-not-working/29040/8 "2024-02-26T05:31:18Z")
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 ---
**Author:** ![jkel.1996](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/jkel.1996/32/6967_2.png) [@jkel.1996](https://get-help.theconstruct.ai/u/jkel.1996)\ **Post date:** [February 26, 2024, 6:26am UTC](https://get-help.theconstruct.ai/t/bug-ignition-to-ros-bridge-not-working/29040/9 "2024-02-26T06:26:29Z")
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. ![Screenshot from 2024-02-26 13-57-55](https://get-help.robotigniteacademy.com/uploads/default/original/2X/8/806da5fc14971c59da6d90a33fb7e0b162749c39.png) ---
**Author:** ![girishkumar.kannan](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/girishkumar.kannan/32/6994_2.png) [@girishkumar.kannan](https://get-help.theconstruct.ai/u/girishkumar.kannan)\ **Post date:** [February 26, 2024, 7:03am UTC](https://get-help.theconstruct.ai/t/bug-ignition-to-ros-bridge-not-working/29040/10 "2024-02-26T07:03:05Z")
Hi @jkel.1996 , > [@jkel.1996](#): > > 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. Yes, that could be the issue. Thanks for bringing that to notice. > [@jkel.1996](#): > > Oh, apparently I am a new user, that’s why I am not allowed to upload multiple pictures simultaneously. Ah, I see. You need to get these two badges: [Basic Badge](https://get-help.robotigniteacademy.com/badges/1/basic) and [Read Guidelines Badge](https://get-help.robotigniteacademy.com/badges/16/read-guidelines) Regards, Girish ---
**Author:** ![system](https://get-help.theconstruct.ai/uploads/default/original/2X/9/9d3ce8305cc0d0d9b6e07d15767a6f245c526f1b.jpeg) [@system](https://get-help.theconstruct.ai/u/system)\ **Post date:** [March 2, 2024, 7:04am UTC](https://get-help.theconstruct.ai/t/bug-ignition-to-ros-bridge-not-working/29040/11 "2024-03-02T07:04:02Z")
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