ROS2 and Gazebo: multiple robots

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We use different mode values (simple - slam - map) and accordingly, different RViz config files. Alltogether, it creates kind of a mess, but the logic is simple.

                    # Terminal 1
                    # echo $ROS_DISTRO
                    # galactic
                    #
                    # source /opt/ros/galactic/setup.bash
                    #
                    $ cd ~/SnowCron/ros_projects/harsh
                    $ colcon build --packages-select multi_bot_04
                    $ source install/setup.bash
                    
                    # To run a single robot without SLAM or Map (robot name in code is set to ""):
                    $ ros2 launch multi_bot_04 multi_simulation_launch.py world:=src/worlds/maze_with_charger.sdf map:=src/maps/map.yaml keepout_mask:=src/maps/keepout_mask.yaml rviz_config_file:=src/multi_bot_04/rviz/simple_single.rviz mode:=simple

# To run a single robot simulation (SLAM) (robot name set to ""): $ ros2 launch multi_bot_04 multi_simulation_launch.py world:=src/worlds/maze_with_charger.sdf map:=src/maps/map.yaml keepout_mask:=src/maps/keepout_mask.yaml rviz_config_file:=src/multi_bot_04/rviz/slam_single.rviz mode:=slam

# To run a single robot simulation (Map) (robot name set to ""): $ ros2 launch multi_bot_04 multi_simulation_launch.py world:=src/worlds/maze_with_charger.sdf map:=src/maps/map.yaml keepout_mask:=src/maps/keepout_mask.yaml rviz_config_file:=src/multi_bot_04/rviz/map_single.rviz mode:=map

# To run a multi robot without SLAM or Map (robot name set to robot1, robot2): $ ros2 launch multi_bot_04 multi_simulation_launch.py world:=src/worlds/maze_with_charger.sdf map:=src/maps/map.yaml keepout_mask:=src/maps/keepout_mask.yaml rviz_config_file:=src/multi_bot_04/rviz/simple_multi.rviz mode:=simple

# To run a multi robot simulation (SLAM): $ ros2 launch multi_bot_04 multi_simulation_launch.py world:=src/worlds/maze_with_charger.sdf map:='src/maps/map.yaml' keepout_mask:=src/maps/keepout_mask.yaml rviz_config_file:=src/multi_bot_04/rviz/slam_multi.rviz mode:=slam

# To run a multi robot simulation (Map): $ ros2 launch multi_bot_04 multi_simulation_launch.py world:=src/worlds/maze_with_charger.sdf map:='src/maps/map.yaml' keepout_mask:=src/maps/keepout_mask.yaml rviz_config_file:=src/multi_bot_04/rviz/map_multi.rviz mode:=map

As I mentioned earlier, scripts are not yet changed to support multiple robots. This section is here for compatibility, but it will not work! I am going to fix it later.

# Terminal 2 $ cd ~/SnowCron/ros_projects/harsh $ source install/setup.bash # To move a single robot # Single command: $ ros2 topic pub cmd_vel geometry_msgs/msg/Twist '{linear: {x: 0.5, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 0.0}}' # Teleop tool: $ ros2 run teleop_twist_keyboard teleop_twist_keyboard # to move the robot in multi-robot launch, use one of the following # (you can use them simultaneously): $ ros2 topic pub /robot1/cmd_vel geometry_msgs/msg/Twist '{linear: {x: 0.5, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 0.0}}' $ ros2 topic pub /robot2/cmd_vel geometry_msgs/msg/Twist '{linear: {x: 0.5, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 0.0}}' $ ros2 run teleop_twist_keyboard teleop_twist_keyboard --remap cmd_vel:=/robot1/cmd_vel $ ros2 run teleop_twist_keyboard teleop_twist_keyboard --remap cmd_vel:=/robot2/cmd_vel

Waypoints following and Docking to charger

To run these scripts, Terminal 1 should have our launch file started with "mode" equal "map", either for single robot configuration (robot name set to "") or in multi robot configuration. Just to remind you: it can be changed by commenting / uncommenting the following lines in multi_simulation_launch.py:

robots = [ {'name': '', 'x_pos': 0.0, 'y_pos': 0.5, 'z_pos': 0.01, "color_name" : "Green", "color_rgb" : "0 1 0 1"}, # {'name': 'robot1', 'x_pos': 0.0, 'y_pos': 0.5, 'z_pos': 0.01, # "color_name" : 'Yellow', "color_rgb" : "1 1 0 1"}, # {'name': 'robot2', 'x_pos': 0.0, 'y_pos': -0.5, 'z_pos': 0.01, # "color_name" : 'Blue', "color_rgb" : "0 0 1 1"}, ]

To run simple waypoint follower script for a single robot (robot name is ""):

                    # Terminal 3:
                    $ cd ~/SnowCron/ros_projects/harsh/src/multi_bot_04/multi_bot_04
                    $ python3 01_waypoint_follower.py

To run docker charging script for a single robot (robot name is ""):

                    # Terminal 3:
                    $ cd ~/SnowCron/ros_projects/harsh/src/multi_bot_04/multi_bot_04
                    $ python3 03_charger_docking.py

Finally, to run docker charging script on multiple (2) robots:

                    # Terminal 3:
                    $ cd ~/SnowCron/ros_projects/harsh/src/multi_bot_04/multi_bot_04
                    $ python3 04_charger_docking_obstacles_multi

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