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incorrect command in tutorial #3761

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cccccmake opened this issue Jun 27, 2023 · 3 comments · May be fixed by #4928
Open

incorrect command in tutorial #3761

cccccmake opened this issue Jun 27, 2023 · 3 comments · May be fixed by #4928
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help wanted Extra attention is needed

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@cccccmake
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In the tutorial for ROS2 humble, section Gazebo, the command for visualizing lidar data in riv2 is:

ros2 run ros_gz_bridge parameter_bridge /lidar2@sensor_msgs/msg/LaserScan[ignition.msgs.LaserScan --ros-args -r /lidar2:=/laser_scan

This command is considered as a "bad pattern". However, the following command works:

ros2 run ros_gz_bridge parameter_bridge /lidar2@sensor_msgs/msg/[email protected] --ros-args -r /lidar2:=/laser_scan
@ahcorde
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ahcorde commented Jun 27, 2023

can you open a PR fixing this issue?

@clalancette clalancette added the help wanted Extra attention is needed label Jul 6, 2023
@mjforan
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mjforan commented Aug 21, 2023

The first command works for me. I don't know why you would need a bidirectional bridge for a lidar topic, since data should only be flowing from Gazebo.

@edgar-mycrobez
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Hello, I also followed the instruction given here and I do get the "bad pattern" error when using the unidirectional command [ . For me it also makes sense to implement a unidirectional communication channel for this example, but it only works for me with the @ option. I am using Ubuntu 22.04, ROS Humble and Gazebo Fortress. Recommendation for using Gazebo Fortress from here. Thank you.

@fujitatomoya fujitatomoya linked a pull request Jan 8, 2025 that will close this issue
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use bidirectional bridge in ros gz bridge tutorial. ros2/ros2_documentation
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@clalancette @ahcorde @cccccmake @mjforan @edgar-mycrobez