Problem in apm_config.yaml (No effect when changing parameters values)

[hasanosman601]

Issue details

Hi,
I currently use mavros with ros2 and SITL ardupilot.
the problem is that when I change the parameters values in apm_config.yaml file, there is no any effect and all mavros parameters set to default values, I have confirmed by (ros2 parm get..) command.
I actually solved the problem but I don't know why :).
After some digging into mavros code and the ros2 documentation, the problem was about namespacing in apm_config.yaml file so I edited the file to be as below:

• old syntax:
  /mavros/**/sys:
  ros__parameters:
  min_voltage: [10.0]
  disable_diag: false

• new syntax:
  /mavros/sys:
  ros__parameters:
  min_voltage: [10.0]
  disable_diag: false
  that is mean the problem was the ** in the namespace. Beer in mind that if I use the /** as a namespace to set the parameters to any node under any namespace, it works fine .
  I think this doesn't make sense but it worked and I wnat to know... why???

MAVROS version and platform

Mavros: 2.6.0
ROS: Foxy
OS: Ubuntu 20.04.6
However, I believe that this issue is not specific to a particular version of ROS 2. This implies that the same issue is likely to occur in other ROS2 versions as well.