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The DeepRacer Device Info ROS package creates the device_info_node that is responsible for providing the hardware version of the AWS DeepRacer device and software version of aws-deepracer-core debian package.

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AWS DeepRacer device info package

Overview

The AWS DeepRacer device info ROS package creates the device_info_node, which is part of the core AWS DeepRacer application and launches from the deepracer_launcher. For more details about the application and the components, see the aws-deepracer-launcher repository.

This node is responsible for providing the hardware version of the AWS DeepRacer device and the software version of the aws-deepracer-core Debian package. It provides services and functions to detect the current hardware and software version and log the secure boot information.

License

The source code is released under Apache 2.0 (https://aws.amazon.com/apache-2-0/).

Installation

The AWS DeepRacer device comes with all the prerequisite packages and libraries installed to run the device_info_pkg. For more information about the preinstalled set of packages and libraries on the AWS DeepRacer, and about installing the required build systems, see Getting started with AWS DeepRacer OpenSource.

The device_info_pkg specifically depends on the following ROS 2 packages as build and run dependencies:

  1. deepracer_interfaces_pkg: This package contains the custom message and service type definitions used across the AWS DeepRacer core application.

Downloading and building

Open a terminal on the AWS DeepRacer device and run the following commands as the root user.

  1. Switch to the root user before you source the ROS 2 installation:

     sudo su
    
  2. Source the ROS 2 Foxy setup bash script:

     source /opt/ros/foxy/setup.bash 
    
  3. Create a workspace directory for the package:

     mkdir -p ~/deepracer_ws
     cd ~/deepracer_ws
    
  4. Clone the device_info_pkg on the AWS DeepRacer device:

     git clone https://github.com/aws-deepracer/aws-deepracer-device-info-pkg.git
    
  5. Fetch unreleased dependencies:

     cd ~/deepracer_ws/aws-deepracer-device-info-pkg
     rosws update
    
  6. Resolve the device_info_pkg dependencies:

     cd ~/deepracer_ws/aws-deepracer-device-info-pkg && apt-get update
     rosdep install -i --from-path . --rosdistro foxy -y
    
  7. Build the device_info_pkg and deepracer_interfaces_pkg:

     cd ~/deepracer_ws/aws-deepracer-device-info-pkg && colcon build --packages-select device_info_pkg deepracer_interfaces_pkg
    

Usage

Although the device_info_node is built to work with the AWS DeepRacer application, you can run it independently for development, testing, and debugging purposes.

Run the node

To launch the built device_info_node as the root user on the AWS DeepRacer device, open another terminal on the AWS DeepRacer device and run the following commands as the root user:

  1. Switch to the root user before you source the ROS 2 installation:

     sudo su
    
  2. Source the ROS 2 Foxy setup bash script:

     source /opt/ros/foxy/setup.bash 
    
  3. Source the setup script for the installed packages:

     source ~/deepracer_ws/aws-deepracer-device-info-pkg/install/setup.bash 
    
  4. Launch the device_info_node using the launch script:

     ros2 launch device_info_pkg device_info_pkg_launch.py
    

Launch files

The device_info_pkg_launch.py included in this package provides an example demonstrating how to launch the deepracer_navigation_node.

    from launch import LaunchDescription
    from launch_ros.actions import Node

    def generate_launch_description():
        return LaunchDescription([
            Node(
                package='device_info_pkg',
                namespace='device_info_pkg',
                executable='device_info_node',
                name='device_info_node'
            )
        ])

Node details

device_info_node

Services

Service name Service type Description
get_device_info GetDeviceInfoSrv A service that is called to get the AWS DeepRacer hardware and software packages version information.

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The DeepRacer Device Info ROS package creates the device_info_node that is responsible for providing the hardware version of the AWS DeepRacer device and software version of aws-deepracer-core debian package.

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