yaml file passed to launch file doesn't take effect about launch_ros

[xhuan28]

More information:
But the parameters can be set successfully through dictionary one by one. Is there anything wrong with the namespace?
e.g.

                ComposableNode(
                    package='my_package',
                    node_plugin='namespace::Class',
                    node_name='my_node',
                    parameters=[param_file_path,                    # no effect
                                         {'enabled_param1': 'true'}],)   # successfully

[xhuan28]

I have found out the root cause of this issue. It is caused by different naming rules between yaml file and direct dictionary parameter. A parameter from a yaml file will combine its name as a string like "/ns.my_node.ros__parameters.my_param", while passing a parameter as a dictionary directly, the name should be "my_param". Parameter system takes these two parameters for different parameters, not the same one. So the parameter from a yaml file will not override the default value to take effect.
I think we need to make the naming rule consistent among different parameter sources. I submit a PR#58. Please have a review. Thanks.

[mabelzhang]

Related issue ros2/rclcpp#715