TurtleBot3 Multi-Robot Example Added! 
Curious about how to control multiple robots in the ROS 2 Humble environment? We’ve prepared a new example, manual, and video based on customer feedback!
Run multiple TurtleBot3s simultaneously (Supports both Gazebo & real robots!)
Use ROS namespaces for individual robot control
Visualize multiple robots in RViz
Now it’s your turn to try it out! 
Videos
Manual
GitHub Repositories
https://github.com/ROBOTIS-GIT/turtlebot3
https://github.com/ROBOTIS-GIT/turtlebot3_simulations