`expand_gz_topic_names` parameter does not work

[elkuno213]

Environment

• OS Version: Ubuntu 22.04
• Source or binary build? binary build by apt, version iron

Description

• Expected behavior: when expand_gz_topic_names is true, the namespace on Gazebo should be changed.
• Actual behavior: the namespace does not change and this parameter cannot be found via ros2 param list.

Steps to reproduce

1. Follow the Example 6.
2. Run this command:

ros2 run ros_gz_bridge parameter_bridge chatter@std_msgs/msg/[email protected] \
  --ros-args -p expand_gz_topic_names:=true -r __ns:=/demo

3. In other terminal, run this command:

ign topic --list 
# Output: /chatter

The topic is still /chatter, not /demo/chatter as expected.

4. Run other command to check whether the parameter is existing:

ros2 param list | grep expand_gz_topic_names
# Output: nothing found

5. This code snippet shows that expand_gz_topic_names only works when config_file is given.

Output