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ROS 1 retro-compatibility with Luos tutorial

Luos with ROS 1​

The ROS 1 Bridge allows ROS 2 packages such as luos_ros2 to communicate with a ROS 1 ecosystem. However, both ROS 1 and 2 need to be installed, and the bridge takes care of the translation. This procedure has been tested with ROS 1 Noetic + ROS 2 Foxy and Python 3.8.2 in Ubuntu. It might work with older distributions, although it has not been tested.

1. Install ROS 2 and Luos​

Make sure you have first installed ROS 2 and managed to run the broker in ROS 2 with the command ros2 launch luos_interface broker.launch.py.

We assume your ROS 2 workspace is ~/ros2_ws.

2. Install ROS 1 and the ROS 1 bridge​

Then install ROS 1 Noetic on Ubuntu 20.04. We assume your ROS 1 workspace is ~/ros_ws.

3. Initialize the bridge​

The bridge has its own workspace that is to be compiled with colcon (ROS 2):

mkdir -p ~/ros1_bridge_ws/src
cd ~/ros1_bridge_ws/src
git clone -b foxy https://github.com/ros2/ros1_bridge.git
source ~/ros_ws/devel/setup.bash
source ~/ros2_ws/install/setup.bash
cd ~/ros1_bridge_ws
colcon build --packages-select ros1_bridge --cmake-force-configure --cmake-args -DBUILD_TESTING=FALSE

4. Start Luos in ROS 1​

In terminal 1: ROS Core in workspace ~/ros_ws

source ~/ros_ws/devel/setup.bash
roscore

In terminal 2: ROS 1 Bridge in workspace ~/ros1_bridge_ws

source ~/ros1_bridge_ws/install/setup.bash
ros2 run ros1_bridge dynamic_bridge --bridge-all-2to1-topics

In terminal 3: Luos broker in workspace ~/ros2_ws Plug some Luos services before starting the broker.

source ~/ros2_ws/install/setup.bash
ros2 launch luos_interface broker.launch.py

In terminal 1: Your ROS 1 app in workspace ~/ros_ws Let us consider that rostopic is the ROS 1 app you want to run with Luos services.

source ~/ros_ws/devel/setup.bash
rostopic list

You can then publish and subscribe to the available topics in ROS 1.