I am currently working with ROS2 Galactic and Ignition. For my purposes I am trying two spawn two robots with a camera sensor through a launch file in an Ignition world:

first_robot_node = Node(
    package='ros_ign_gazebo',
    executable='create',
    output='screen',
    arguments=[ "-file", get_package_share_directory('rollbot_description')+"/urdf/rollbot.urdf",
                "-name", 'rollbot', "-x", "-2", "-y", "0", "-z", "0.1"]
)   

second_robot_node = Node(
    package='ros_ign_gazebo',
    executable='create',
    output='screen',
    arguments=[ "-file", get_package_share_directory('climbbot_description')+"/urdf/climbbot.urdf",
                "-name", 'climbbot', "-x", "5", "-y", "0", "-z", "0.1"],
) 

The problem being, both of the robots are publishing to the "/image" topic, causing conflicts. So I'd like to have the rollbot publish to "/rollbot/image" and climbbot publish to "/climbbot/image". However, I can't seem to work out how to do that. I have tried modifying the node call in the following ways:

 first_robot_node = Node(
    package='ros_ign_gazebo',
    namespace="rollbot", # First I tried giving the node a namespace but this had no effect
    remappings=[("/image","/rollbot/image")], # Secondly I tried remapping the topic. Also no effect.
    executable='create',
    output='screen',
    arguments=[ "-file", get_package_share_directory('rollbot_description')+"/urdf/rollbot.urdf",
                "-name", 'rollbot',
                # Third I tried passing namespace as an argument to create. But also no effect.
                "-namespace", "rollbot",
                "-x", "-2", "-y", "0", "-z", "0.1"]
)   

The only thread I can find where someone spawned multiple robots with different namespaces is this Box Bot project which uses 3 different files to spawn multiple robots. It just feels like massive complexity for something that I feel must be a pretty common problem.

Anyone know how I need to modify my launch file for both bots to publish to different topics?