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gazebosim / gz-transport

Transport library for component communication based on publication/subscription and service calls.
https://gazebosim.org
Apache License 2.0
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Provide a tool to diagnose network setup issues #476

Open azeey opened 10 months ago

azeey commented 10 months ago

Desired behavior

Many new users run into problems using Gazebo due to improper network configuration. It would be great if we can provide a tool to diagnose the problem. As a first step, we can provide a tool like https://docs.ros.org/en/rolling/How-To-Guides/Installation-Troubleshooting.html#enable-multicast that checks if there is a UDP multicast problem blocking discovery.

Alternatives considered

n/a

Implementation suggestion

This could be a gz command.

Additional context

Related issues: https://github.com/gazebosim/gz-sim/issues/1879 https://github.com/gazebosim/gz-sim/issues/2285

mapi-ng commented 3 months ago

Hi @azeey, thank you for bringing this issue.

I have just recently installed ROS2 and Gazebo and I ran into this issue.

I think just having a timeout and an error message with suggestion to enable multicast would be of great help to new users. As a user trying to troubleshoot this kind of issue it would not be my first thought to run a separate gz command for network diagnosis - here is why.

Before I realized that it was sufficient to Enable multicast, I had troubles understanding what the real problem was. My first thought was about graphics driver configuration.

Only after using verbose output with -v 4 debug level did I understand that the issue was rather network related and only then was I able to find this related issue: https://github.com/gazebosim/gz-sim/issues/2285