micro-ROS / micro-ROS/micro-ROS-Agent
No Topic Visible if running micro ros agent on Humble, but these are visible if the agent is running on Foxy
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- Dominant language
- C++
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Description
## No Topic Visible if running micro ros agent on Humble, but these are visible if the agent is running on Foxy
- Hardware description: Linux and ESP32
- RTOS: -
- Installation type: micro_ros_setup
- Version or commit hash: Humble
#### Steps to reproduce the issue
I have followed the tutorial from the links below:
https://micro.ros.org/docs/tutorials/core/first_application_linux/
https://micro.ros.org/docs/tutorials/core/teensy_with_arduino/
The issue is, if I run the micro ros agent on ROS Humble (both serial or udp), I don't see any topics and nodes related. But in -v6 I am able to see the data is publishing.

The thing is, I am able to subscribe it through node. But I am not able to see the topic list in the terminal.
I have tried unset ROS_DOMAIN_ID, set the same ROS_DOMAIN_ID, set the same RMW_IMPLEMENTATION, unset the RMW_IMPLEMENTATION. But nothing works.
Then I tried to use foxy to run micro ros agent (using docker ros-foxy), I am able to see the topic list on Humble. And I also able to echo it. as you can see the picture below

#### Expected behavior
I should be able to see the topic list, while the micro ros agent runs in the Humble.
#### Actual behavior
Unable to see the topic list, while the micro ros aget runs in the Humble.
#### Additional information
This is my env, even if I didn't set the same ROS_DOMAIN_ID, and didn't set the RMW_IMPLEMENTATION, if I run the agent on Foxy, it still work and detected on Humble 
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the issue with the micro-ROS Agent on ROS 2 Humble and compare its -v6 output with the Foxy Docker setup, using both serial and UDP as described. Check the ROS_DOMAIN_ID and RMW_IMPLEMENTATION variations from the report. Done means topics and nodes are discoverable and can be echoed when the agent runs on Humble.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- networking, robotics
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 28/100