Issue Spawning Multiple Robots in Simulation

[CBeaune]

Hi!
Thank you for this repository, which allows us to simulate our Rosbots with the ROS jazzy branch.

We are able to spawn a single robot successfully, but when attempting to launch multiple robots using the following command:

ros2 launch rosbot_gazebo simulation.launch.py robots:='robot1={x: 0.0, y: -1.0}; robot2={x: 0.0, y: 0.0}; robot3={x: 0.0, y: -2.0};'

only robot1 spawns correctly, while the other two fail. Additionally, the error messages vary between test runs. Here are some examples of errors we encountered:

• IMU Broadcaster Activation Failure:

[spawner-9] [ERROR] [1739376969.236040015] [robot1.spawner_imu_broadcaster]: Failed to activate controller : imu_broadcaster
Fatal error: b'[ERROR] [1739376969.236040015] [robot1.spawner_imu_broadcaster]: \x1b[91mFailed to activate controller : imu_broadcaster\x1b[0m\n'. Emitting shutdown...

• Controller Manager Configuration Failure:

[spawner-7] [WARN] [1739376750.385733679] [spawner_joint_state_broadcaster]: Failed getting a result from calling /controller_manager/configure_controller in 10.0. (Attempt 1 of 3.)
Fatal error: b'[WARN] [1739376750.385733679] [spawner_joint_state_broadcaster]: Failed getting a result from calling /controller_manager/configure_controller in 10.0. (Attempt 1 of 3.)\n'. Emitting shutdown...

My intuition is that the Controller Manager does not properly handle multiple robot namespaces, but I am not certain if this is the root cause or how to resolve it.

Any guidance or fixes would be greatly appreciated!

Thanks in advance for your help.