ROS1-ROS2 Bridge

Note: Tested with ROS 1 Noetic and ROS 2 Foxy on Ubuntu 20.04.

Demo: TurtleBot3 simulation is launched using ROS 1 Noetic and it is controlled from ROS 2 Foxy using ros1_bridge package.

1. Install ros1_bridge for ROS 2:

$ sudo apt update
$ sudo apt install ros-foxy-ros1-bridge

2. Fire up a terminal window and launch TurtleBot3 simulation using ROS 1:

$ source /opt/ros/noetic/setup.bash
$ source ~/ROS1_WS/TurtleBot/devel/setup.bash
$ roslaunch turtlebot3_gazebo turtlebot3_world.launch

3. Fire up another terminal tab/window and execute ROS 1 Bridge:

$ source /opt/ros/noetic/setup.bash
$ source /opt/ros/foxy/setup.bash
# ROS_DISTRO was set to 'noetic' before. Please make sure that the environment does not mix paths from different distributions.
$ echo $ROS_MASTER_URI
# http://localhost:11311
$ export ROS_MASTER_URI=http://localhost:11311
$ ros2 run ros1_bridge dynamic_bridge
# created 2to1 bridge for topic '/rosout' with ROS 2 type 'rcl_interfaces/msg/Log' and ROS 1 type 'rosgraph_msgs/Log' ...

4. Fire up yet another terminal tab/window to control the ROS 1 TurtleBot3 simulation from ROS 2:

$ source /opt/ros/foxy/setup.bash
$ ros2 topic pub /cmd_vel geometry_msgs/Twist "
linear:
  x: 0.5
  y: 0.0
  z: 0.0
angular:
  x: 0.0
  y: 0.0
  z: 0.0
"
# publisher: beginning loop
# publishing #1: geometry_msgs.msg.Twist(linear=geometry_msgs.msg.Vector3(x=0.5, y=0.0, z=0.0), angular=geometry_msgs.msg.Vector3(x=0.0, y=0.0, z=0.0)) ...

5. Observe the results:

   • Simulated TurtleBot3 should start moving forward with 0.5 m/s velocity.

   • In the terminal where you’re running the ros1_bridge, you should see messages similar to the following:

     created 2to1 bridge for topic '/cmd_vel' with ROS 2 type 'geometry_msgs/msg/Twist' and ROS 1 type ''
     [INFO] [1693968527.777201784] [ros_bridge]: Passing message from ROS 2 geometry_msgs/msg/Twist to ROS 1 geometry_msgs/Twist (showing msg only once per type)
     [INFO] [1693968527.777518090] [ros_bridge]: Passing message from ROS 2 rcl_interfaces/msg/Log to ROS 1 rosgraph_msgs/Log (showing msg only once per type)created 2to1 bridge for topic '/cmd_vel' with ROS 2 type 'geometry_msgs/msg/Twist' and ROS 1 type ''
     [INFO] [1693968527.777201784] [ros_bridge]: Passing message from ROS 2 geometry_msgs/msg/Twist to ROS 1 geometry_msgs/Twist (showing msg only once per type)
     [INFO] [1693968527.777518090] [ros_bridge]: Passing message from ROS 2 rcl_interfaces/msg/Log to ROS 1 rosgraph_msgs/Log (showing msg only once per type)