Category "ros"

Offline Ros Bridge Intallation / without internet

We want to install Ros Bridge to our server. But we don't have internet access on server. Is it possible we can install without internet? Thank you...

Convert mp4 into .bag file

I'm currently working with computer vision systems and I was just wondering if it is possible to convert .mp4 (or any other type of video format) into .bag file

odom and base_link frames are far - localization

I have an imu and gps only and i want use them for localization. I am using robot_localization ekf node. its setting is similar to this. when I view the tf on r

Why is my Python Subscriber/Publisher node not publishing anything? Thank you

The instructions for the question are below Question report 2.7. You are now ready to make a ROS node to perform real-time extraction of the centroid of the lin

Undderstanding JointTrajectoryController of ros_control

currently, I am trying to understand how the hardware_interface and ros_control work: velocity_controllers/JointTrajectoryController is chosen for the controlle

orocos ros integration, createStream causes execution to stuck in a loop

I'm integrating orocos with ros, basically i created a component that read data from some input ports and write on output ports that create streams, because i w

Using ssh to login to linux terminal from windows and run command in a logged in shell

First of all, this may seem like a duplicate question but I have searched stack overflow/various other forum sites and still haven't managed to find a solution.

ROS Services in python. Server and client node

Hi I create not ROS python code for the server and the client. But need some help in implementing the ROS part for both of them. The Server only need to print a

GPS Navigation, how to select GEO reference as the origin of my map (0, 0)

I'm doing GPS navigation for a vehicle. After getting the GNSS (GPS) data, I need to convert (longitude, latitude) to my map frame. How should I choose the orig

Whenever I save the map through rviz. It's stops and does not working

OS : Linux(ubuntu20.04) Tool: Ubuntu 20.04, slamtoolbox(noetic devel), rviz version 1.14.14 I executed it in the 'Terminal' in the order below. $ roscore (New T

How to extract ROS parameters from bag file and save them in xlsx format?

I have record a ROS bag file. But when I play it one terminal with rosbag play my_file.bag and in the another terminal I do rosparam list its only shows the

Gazebo 4 Wheeled Robot does not move

I made a URDF-File for a 4-wheeled Robot. I would like to test it in Gazebo. I have it working so far. I have 4 wheels, they also turn. I confirmed this by turn

ROS topic is not published yet

I have this code which receives data from node (subscribe) and then inside this node I do some mathematical operation, then I want to publish the data to a cert

I can't assign the value of a geometry point to a variable

I was trying to assign the value of a geometry point (it has x,y,z. All of them are float64. If you want to check it: http://docs.ros.org/en/noetic/api/geometry

Get ros message type at runtime

I'm hoping to have a config file loaded in via rosparam that includes the type for a generic callback to subscribe to. Right now this is what I have but can't f

ROS nodes running but some connections are broken

Setup I am running ROS nodes on two separate machines (my laptop, running ROS melodic on Ubuntu 18.04, and a voxl computer running ROS kinetic on yocto). Proble

ROS - How do I publish a message and get the subscribed callback immediately

I have a ROS node that allows you to "publish" a data structure to it, to which it responds by publishing an output. The timestamp of what I published and what

How to use cv::decode (access image) correct?

I need help with the following problem: Task script: read in the message sensor_msgs/PointCloud2, display Bird Eye View image and save (png or jpg). Desired new

How to install the 'glob' module?

I am running ubuntu 14.04 and trying to launch ROS Simulator. I have this error: ImportError: No module named 'glob' Installing glob2 does not solve the prob

Positioning system for 1:8 scale RC cars with millimeter accuracy

I am looking for a indoor positioning/2d motion tracking system for small robot cars (1:8 scale RC cars). We want to use the system as a ground truth for the de