I have two packages, gps_driver and gps_msg.

Driver: gps_driver->gps_driver->python->gps_driver.py Msg: gps_msg->msg->GpsMsg.msg In the relevant package.xml, gps_msg is listed as a dependency for gps_driver. The gps_driver has the following line:

from gps_msg.msg import GpsMsg

which causes the error: ModuleNotFoundError: No module named gps_msg

Both packages are in the .src folder of the same workspace, everything is built.

Hi, i tried line follower robot in ROS2 humble with a box geometry and two cylinders, gave it mass intertia etc and a camera it worked nicely, i then made a model of AGV and saved the stl file, however the model is not showing up in the rviz, its loaded correctly, I intentionally gave it wrong stl path in mesh tag and it gave error it cannot load, so the stl path is correct, the stl file is also proper, its just that its not visible and i have found no fix for it, please help

So I'm working on a robot for a school project, and I have motors that work from CANOpen. I found the ros2_canopen repository on github to use with ros2_control for this, but whenever I go to build it there is always a failure when trying to build the canopen_core section of the repo. I am very much a beginner at this and I have no idea how to fix this issue or what other alternatives I could use for control. The robot uses a Jetson Orin Nano Dev board with ROS2 Humble.

My lidar appeared to be working correctly, but then I wrote a ROS2 node that subscribes to the /scan topic, and suddenly, the /scan message returned all zeros in the "ranges" lists. See the inserted image.

Has anyone experienced this? Any ideas as to why that could be the case?

Thanks

https://preview.redd.it/9awpqbozgwge1.png?width=3106&format=png&auto=webp&s=a165b3d972180475f8d8fd311f5ffb3cf2746b31

Im been looking a diffdrive_arduino similar to the Articulated robotics that is compatible in ROS2 jazzy. Can someone help me. Sorry for asking but Im just new to this.

I'm new to ROS and I'm beginner in programming as well and I'm weiting my first few ros publishers and subscribes in python faced few problems but got them right after some help from documentation but when I proceeded to write my launch files it felt like a big puzzle as I was stuck for two days and asked chatgpt for help and it imported many libraries and used many weird methods fast forward I tried to understand every line but my question is how could I as developer get a good knowledge of what Libraries to use and how to use them how do I know whats missing in my program when its not working cause its missing a library without any hint at it ?

Hello! I have been exploring ROS and Gazebo for almost a month now. The basics were pretty simple and I got a grasp of them quite quickly. After that I started doing Articulated Robotics' "Building a mobile robot" and was able to somehow survive till the control part but now I am completely lost. If anyone knows of a simple step-by-step project with a detailed explanation, I would really appreciate it.

I'm building a robot with ackermann steering using ROS2 Humble but I'm running into problems with the controller. There are DiffDrive controllers but I'm not able to find something similar for ackermann driving in ROS2 and as a result I'm not able to drive it around in Gazebo using keyboard teleop or joystick.

I can write a controller by myself but it will take a lot of time which I don't have at this point, so I'm looking for existing controllers that I can use.

Thanks!

I'm building an autonomous mobile robot and i have a raspberry pi 5 and I'm willing to buy this Lidar

https://uk.rs-online.com/web/p/sensor-development-tools/2037609

but I'm not sure if it is compatible with Ros2 jazzy and raspberry pi 5, I'm a beginner at this so excuse me if its a dumb question.

Hey guys I Am working on an automated forklift project for my graduation project that: -detects boxes. -goes to the nearest one. -inserts fork in pallet correctly . -reads the qr via a normal qr scanner and knows the locarion in the warehouse it's supposed to go in. -sorts boxes besides each other . I am also a beginner in ros and only did simulations --any advice for the steps i need to finish this project or if i should use a jetson nano or raspberry pi? --if any one tried to do a similar project please contact me.

I am a software team member in a Underwater Robotics team. We have to participate in a robotics contest where we are supposed to provide a simulation of an ROV which does a specific task. I was thinking about using Gazebo for simulation but I really don't know where to get started + the fact that most Tutorials for gazebo are for Wheeled robots.

I was thinking about simulating our model using something like Gazebo and then add plugins, but I heard simulating with something like Unity or Unreal (holocean simulator) gives better results when going for vision-based tasks.

Also, what would be the estimated time that this process might take coz our competition is due in 3-4 weeks and, we have to make our model and have our simulation working without major flaws.

It is just wonderful the Turtlebot4 Game Controller has left and right wall following, dock and undock functions, except that my "TurtleBot4 clone" TB5-WaLI uses the much less expensive Logitech F710 USB Wireless Game Controller.

Luckily, I figured out how to configure the Turtlebot4 code to listen to my controller!

https://preview.redd.it/piomhhiy4lge1.jpg?width=4032&format=pjpg&auto=webp&s=d769cf0c9826462cc73cbe51cb2d6eefca83c931

Using the Undock, Dock button:

2025-02-01 12:00|wali_node.py| ** WaLI Noticed Undocking: success at battery 95%, docked for 2.0 hrs **
2025-02-01 12:23|wali_node.py| ** WaLI Noticed Docking: success at battery 72% after 0.4 hrs playtime **

~/carla-ros-bridge/catkin_ws$ ros2 run carla_spawn_objects carla_spawn_objects -n ego_vehicle -m vehicle.tesla.model3

[FATAL] [1738424917.141950174] [default]: Exception caught: Could not read object definitions from

[INFO] [1738424917.142442756] [carla_spawn_objects]: Destroying spawned objects...

https://preview.redd.it/t8m3vn44yjge1.png?width=1920&format=png&auto=webp&s=c8504dfe474ecf3d2966e8b234d1be020425d9af

Hey everybody,

I'd like to present to you a toolset I've been working on during the past few months: The ros2_utils_tool!
This application provides a full GUI based toolset for all sorts of ROS2-based utilites to simplify various tasks with ROS at work. Just a few features of the tool as follows:

• Edit an existing ROS bag into a new one with the function to remove, rename or crop tasks
• Extract videos or image sequences out of ROS bags
• Create ROS bags out of videos or just using dummy data.
• Publish videos and image sequences as ROS topics.

For most of these options, additional CLI functionality is also implemented if you want to stick to your terminal.
The ros2_utils_tool is very simple to use and aimed to be as lightweight as possible, but it supports many advanced options anyway, for example different formats or custom fps values for videos, switching colorspaces and more. I've also heavily optimized the tool to support multithreading or in some cases even hardware-acceleration to run as fast as possible.
As of now, the ros2_utils_tool supports ROS2 humble and jazzy.
The application is still in an alpha phase, which means I want to add many more features in the future, for example GUI-based ROS bag merging or republishing of topics under different names, or some more advanced options such as cropping videos for publishing or bag extraction.
The ros2_utils_tool requires an installed ROS2 distribution, as well as Qt (both version 6 and 5 are supported), cv_bridge for transforming images to ROS and vice versa, and finally catch2_ros for unit testing. You can install all dependencies (except for the ROS2 distribution itself) with the following command:

sudo apt install libopencv-dev ros-humble-cv-bridge qt6-base-dev ros-humble-catch-ros2

For ROS2 Jazzy:

sudo apt install libopencv-dev ros-jazzy-cv-bridge qt6-base-dev ros-jazzy-catch-ros2

Install the UI with the following steps:

• cd path/to/your/workspace/src
• git clone https://github.com/MaxFleur/ros2_utils_tool.git
• cd path/to/your/workspace/
• colcon build

Then run it with the following commands:

• source install/setup.bash
• ros2 run ros2_utils_tool tool_ui

I'd love to get some feedback or even more ideas on tasks which might be useful or helpful to implement.
Thanks!

Hi, I'm new to ROS and I have a question about transforms (tf). Let's say I have a simple two-wheeled robot and there is a controller that publishes odometry to /odom. Let's say I also have an IMU in the robot and a node that publishes to /imu/raw_data

Then let's say I use the ekf_node from the robot_localization package to fuse /odom and /imu/raw_data and there is a resulting topic, /odometry/filtered.

Let's also say I have a lidar that is published to a /scan topic.

If I then go to use the slam_toolbox to do some mapping and localization, I assume for the odom topic in the slam_toolbox config file I want to put in /odometry/filtered and not just /odom right? And if this is the case, then I need to make sure I have a transform for /odometry/filtered to /base_link?

Thanks for any help or insights.

I was curious if there are any libraries that essentially allow you to record known data from a sensor for example, and then use that for unit testing for robot controllers. I.e. essentially playing back data to the controller to make sure the final state is within a tolerated deviation from the setpoint. Maybe this is easily doable with rosbag but I was curious if there is anything without that heavy ROS dependency. Because if not, I think I would develop something by myself. If the idea is not clear, please tell me, it's essentially replaying known state data that were manually recorded to be a "successful" run and checking if the correct controller inputs are generated by your code. For example with a walking robot, play back joint position and velocity and check if the generated torques are correct, as well as if the final state the robot arrives is within a specified tolerance to the "correct" one.

Does it work?

Hello guys,

As discussed from my last post, I am unable to see any image in rviz2. It just showing a gray image when I try to visualize it rviz2 even I place any object infront of the camera. Can somebody help me in that. I am posting my urdf file and the launch file here for information. It would very kind of you if someone can help

URDF:

<link name="camera_link">             <visual name="camera">                <origin xyz="0 0 0" rpy="0 0 0"/>                <geometry>                  <mesh filename="package://robotiq_description/meshes/visual/d455.stl" scale="0.0005 0.0005 0.0005"/>                 </geometry>             </visual>             <collision name="camera">               <origin xyz="${d455_zero_depth_to_glass-d455_cam_depth/2} ${-d455_cam_depth_py} 0" rpy="0 0 0"/>               <geometry>                 <box size="${d455_cam_depth} ${d455_cam_width} ${d455_cam_height}"/>               </geometry>             </collision>             <inertial>                <mass value="0.072" />                <origin xyz="0 0 0" />                <inertia ixx="0.003881243" ixy="0.0" ixz="0.0" iyy="0.000498940" iyz="0.0" izz="0.003879257" />             </inertial>         </link>          <link name="camera_frame_link"></link>          <joint name='robotiq_85_base_link_to_camera_link' type="fixed">           <parent link="robotiq_85_base_link"/>           <child  link="camera_link"/>           <origin xyz="0.052 -0.0001 -0.020" rpy="${pi/2} ${pi} ${pi/2}"/>         </joint>          <joint name="camera_link_to_camera_frame_link" type="fixed">           <parent link ="camera_link"/>           <child link="camera_frame_link"/>           <origin xyz="0 0 0" rpy="${-pi/2} 0 ${-pi/2}"/>         </joint>                                                         launch file:    gz_ros2_bridge = Node(         package="ros_gz_bridge",         executable="parameter_bridge",         arguments=[             '/clock@rosgraph_msgs/msg/Clock[gz.msgs.Clock',             "/image_raw@sensor_msgs/msg/Image[gz.msgs.Image",             "/camera_info@sensor_msgs/msg/CameraInfo[gz.msgs.CameraInfo",         ],         output='screen',     )               tf2_ros_bridge = Node(             package='tf2_ros',             namespace = 'base_to_wrist_3',             executable='static_transform_publisher',             arguments= ["0", "0", "0", "0", "0", "0", "base_link", "ur5_robot/wrist_3_link/camera"]         ) 

https://preview.redd.it/0fsuphagdcge1.jpg?width=1918&format=pjpg&auto=webp&s=157726ee4b939036a93e32bafeccff3554be8717

Hi guys! I'm starting a ROS course that needs having installed ROS and ROS2. The thing is I don't know wich kind of set up i should go for. I want to keep windows so i'll have a dual boot with an Ubuntu system. What kind of setup do you recommend me?(Ubuntu version, ROS2 version using containers or not)I'm kinda noob in this stuff so I would appreciate any help!

ros2 run teleop_twist_keyboard teleop_twist_keyboard --ros-args --remap cmd_vel:=/diff_drive_controller/cmd_vel -p stamped:=true

It works on the gazebo but doesn't work on the real robot. Im using ros2 jazzy. Can someone help me how to move the real robot

Hey all,

I've been trying for a bit of time to set up gazebo simulator on my m3 Mac, I can't seem to get gz to install for my home-brew python 3.11 install when I use:

brew install gz-ionic

I have 3.12 and 3.13 installed for home-brew and it works fine for those. Anyone experienced something similar?

Hi,

(Jazzy, Ubuntu 24.04, Nvidia Jetson, Docker)

I am currently deploying my ROS2-based robot using a launch file inside a Docker container on a Jetson device. I manually start the system by running ros2 launch within the container. However, I want to take it to the next level and make my robot truly production-ready by ensuring all necessary nodes and processes start automatically upon boot.

What are the best practices for achieving this? Specifically, I’d like to know:

1. How to automatically launch all required ROS2 nodes after the robot boots up (is systemd the best way to do so).
2. How do I make the code "invisible" inside the docker container I will build.
3. How to handle error recovery and ensure robustness in case a node or process crashes?
4. Any other considerations for a production-level deployment of a ROS2 robot.

I’d really appreciate insights from those who have deployed ROS2 robots in real-world applications.

Thank you !

I used slam to map the surrounding environment, and then switched to localization and gave the path to the serialized map with no extensions. but still, slam can't open the file.. any body has an idia why?

Hey,
Hope you are doing well. Actually I am a begineer in robotics and ros2, recently I am trying to attach a depth camera to the gripper base link of my robot. Moving forward when I try to visualize the point cloud 2 , i keep getting error saying messages:

[rviz2-3] [INFO] [1738243875.620376965] [rviz2]: Message Filter dropping message: frame 'ur5_robot/wrist_3_link/camera' at time 23.400 for reason 'discarding message because the queue is full'

can someone please help me with it