I am trying to create a two robot simulation. For my use case, I would like to use the simple commander API to send nav through poses command through the simple commander API. The robots spawn successfully in the RViz as well as the Gazebo, with independent Nav stacks(and I can send those commands through RViz). Can someone guide me on how can I add namespaces to the while using the API so that I can set initial pose as well as send goal poses to the correct robot accordingly. I am using ROS2 Iron Irwini on Ubuntu 22.04.