Parameter grouping doesn't work with new command line syntax

[ivanpauno]

Bug report

Required Info:

• Operating System:
  • Ubuntu 18.04
• Installation type:
  • from source
• Version or commit hash:
  • master
• DDS implementation:
  • Any
• Client library (if applicable):
  • rclcpp (probably the same happens in rclpy)

Steps to reproduce issue

ros2 run demo_nodes_cpp parameter_blackboard --ros-args -p "some_lists.some_integers:=[1, 2, 3, 4]"

Expected behavior

The node is created with the specified parameters.

Actual behavior

An error:

[ERROR] [rcl]: Failed to parse global arguments

Additional information

Connected with ros2/ros2_documentation#376.

[ivanpauno]

@hidmic FYI

[hidmic]

As we spoke offline, this is due to an inconsistency in how the YAML parser in rcl_yaml_param_parser names parameters and how rcl expects to parse them: the former uses dots (.) to flatten dictionaries, the latter expects slashes (/). IIUC we want to go towards slashes, there's even a design document about it. But it's likely too late to make it uniform everywhere.

So, I'll change rcl to use dots now and I'll leave a TODO to go back to slashes for F-Turtle. @dirk-thomas @mjcarroll @wjwwood for awareness.

[jacobperron]

@hidmic Can this be closed since #530 ?

[mjcarroll]

@hidmic another bump, can this one be closed now?

[hidmic]

Whoops, completely lost the notification. Yes, we can close.