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Problem communicating with multiple ROS units: rostopic list is visible but not rostopic echo. ($ROS_IP is already set)

I am communicating with my desktop PC as master and my Raspberry pi as slave. When I start a node on the Raspberry pi and publish a topic (/scan), the desktop PC ...
yagi's user avatar
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Does the industrial_extrinsic_cal package support multi cam extrinsic calibration with non-overlapping FOVs?

I know it can do "Multi-Camera Extrinsic Calibration with a Target" as per this tutorial (http://wiki.ros.org/industrial_extrinsic_cal/Tutorials/Multi_camera_calibration), but does it work ...
Christopher Sahadeo's user avatar
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1 answer
5 views

Independent ROS sessions on Linux machine with multiple users

HI there! On an Ubuntu 20.04 with multiple users can each user use ROS Noetic without interfering with each other? At the moment if a topic is started, the others ca see its presence Originally ...
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2 answers
26 views

Is there common way to run multiple robots in ROS2?

The hard part is /tf since robot_state_publisher push all frame_ids into single topic. EDIT:...
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1 answer
2 views

[Solved] Error when subscribing to multiple topics in python

Hello, I'm new to ROS and I'm having a problem when I try to move my turtle to a goal that I'm publishing. I created a node that subscribes to 2 topics: the position of the turtle and the ...
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1 answer
28 views

Using multiple RPlidar on a single system

Hello, i would like to use two (or more) rplidars at the same time. When i start the second RPLIDARnode, the first one closes. I tried to find a connection to rosserial, but it seems rplidarnode ...
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1 answer
2 views

Using two sensors simultaneously (Ibeo Scala)

Hi there, I am trying to use two Ibeo Scala sensors at the same time. With the help of the following packages I am able to run one sensor and visualize it in rviz. https://github.com/astuff/ibeo_core ...
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1 answer
3 views

Why I can subscribe /map

I tried to launch multiple turtlebot3 navigation. But when I launch the file, I find I didn't subscribe to the /map. I don't know why. Here is my launch file. ...
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1 answer
47 views

multiple Turtlebot3 navigation and simulation

I found the relative source Multiple robots simulation and navigation. I need to launch a turtlebot3 with navigation, and others can be controlled by teleop. My questions are: 1. Why my launch file ...
user avatar
0 votes
1 answer
4 views

Tf timeout with multiple machines

Hi! I try to get the navigation stack running on my robot. I've got ROS running on the robot and on an PC used for visualization in Rviz and, if possible, for calculation like gmapping. Nodes i need: ...
user avatar
0 votes
1 answer
5 views

TF tree breaks if parent is lost?

In a multiple robot situation, will all child coordinate frames in a TF tree stop working if communication with the parent is lost? For example, I have two aircraft that are trying to localize ...
user avatar
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1 answer
3 views

Calling a (Gazebo) service parallelly from multiple nodes/ Remapping a (Gazebo) service to a particular namespace

I have a multi robot setting (with different namespaces which work totally independent of each other, in the same empty_world) in Gazebo. I have to reset the manipulated objects after a certain time ...
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1 answer
2 views

rosserial, multiple callbacks and interrptions?

Hello, I am new to rosserial. The objective of this program is to make a LED (pin 13) blink with a Period=5s, and then exit this blinking. Thus, after connecting ROS to Arduino via USB, I apply a '...
user avatar
0 votes
1 answer
3 views

Unable to transfer my sensor data or file from one ROS machine to another vai ethernet

Hi, I am trying to transfer sensor data which is connected to one of ROS machine, and transferring the live sensor data to my other ROS machine over ethernet. But i'm not getting how to do it. I'm new ...
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0 votes
1 answer
2 views

One base multiple robots with unstable network

Hey, I am looking for a way to set up a configuration with multiple robots that connects to one base. This base is broadcasting data that's needed by all robots. I was thinking about setting roscore ...
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0 votes
1 answer
9 views

RTABMAP with multiple ZED stereo cameras

Hi, I would like to use multiple ZED stereo cameras for the 3D mapping with RTABMAP. But I notice RTABMAP only supports single stereo camera or stereo camera+laser. Could anyone kindly give me some ...
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0 votes
1 answer
7 views

Multiple Python-Scripts (Turtlebot2 / Kobuki) in kobuki_node

Hi guys, I have multiple python scripts for several tasks. Let's assume: The first one is for driving a certain distance with a given speed. Another one is for image processing purpose (marker ...
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0 votes
1 answer
10 views

Rtabmap with Multiple RealSense ZR300 cameras

Hi all, I am wondering how can I run Rtabmap for mapping using two RealSense ZR300 cameras on ROS platform. It can run with the standalone Rtabmap using single camera, but when it comes to two cameras,...
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0 votes
1 answer
9 views

How to really blink an LED on an arduino through ROS

I set up ROS with an arduino and successfully implemented the blink-example. However, I would like to really make it blink, e.g. to turn the LED on and off with a high frequency. Unfortunately, I have ...
user avatar
0 votes
1 answer
4 views

python directory import issue on ROS

hi all, My ros_workspace directory is like this: ros_workspace --> src--> package1(src, msg, script((folder1-->abc1.py), ( folder2-->abc2.py))): I want import "abc2.py" from &...
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0 votes
1 answer
11 views

Multi-turtlebot3-simulation

HI , all I am newbie . I want to add a swarm of turtlebot3(burger or waffle) in gazebo to simulate advanced control . I used the method as the follwing website : [http://turtlebot3.readthedocs.io/en/...
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1 answer
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simplest multiple-robot scenario

Was having trouble getting multiple robots to work, so I tried to boil it down to the simplest possible scenario. Here's what I have for a launch file: ...
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0 votes
1 answer
6 views

How to source binary packages from different places?

Dear ROS Enthusiasts, I have a problem sourcing binary packages from multiple install directories. These are the source commands I want to work with: source /opt/ros/kinetic/setup.bash source /opt/...
user avatar
0 votes
1 answer
38 views

Why tf trees for multi-robot system not showing?

Hi all, I have been building a simple multi-robot system for 3 days referencing to patrolling_sim, which wrap all necessary nodes for a robot in a group tag. I am ...
user avatar
0 votes
1 answer
6 views

Minimal distance between multiple moving obstacles using PCL

Hello I would like know the minimal distances between the robot (KUKA iiwa,base-fixed) and several moving obstacles(human and other objects). All of these stuff may be moving when collaborative task ...
user avatar
0 votes
1 answer
7 views

[Solved] C++: ApproximateTime with more than two topics?

Hi @all, short version: Could you please provide me with a full version for synchronizing up to eight image topics with ROS? long version: I am currently trying to get my Synchronizer to work. Thanks ...
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0 votes
1 answer
6 views

multiple robots in ROS kinetic with Gazebo 7

Can anyone point me to a good example of using a single URDF and instantiating multiple robots in Gazebo, and also having a consistent transform (tf2) tree? There are several instances of questions on ...
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0 votes
1 answer
21 views

Multiple rosbridge_websocket nodes

I'd like to run two rosbridge_websocket nodes - the only difference would be their names. What's the easiest way to do that? I was thinking that I could create my own ROS package based on the ...
user avatar
0 votes
1 answer
17 views

Running ROS across multiple machine

I'm trying to run ROS on two machines which are connected to a local network. Both can ping each other. I started roscore on first machine and set the ...
user avatar
0 votes
3 answers
76 views

sending multiple goals to navigation stack

Hi everyone, I want to send multiple goals to the navigation stack, that the robot should pass successively. I want to use a node similar to the node from this tutorial http://wiki.ros.org/navigation/...
user avatar
0 votes
1 answer
15 views

How can I use two velodyne(VLP16) together at the same time?

Hello, I have a question about operating two velodyne laser sensors (VLP 16). I’m a ROS and Ubuntu beginner. So, even if my question is inexperienced, please understand me and answer as in detail as ...
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0 votes
1 answer
3 views

How to generate different random cmd_vel messages?

Hello everyone, I'm trying to have two (or several) robots receiving a random cmd_vel message. I was expecting that each robot would present a different velocity (I'm using Gazebo) but instead what I ...
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0 votes
1 answer
2 views

ROS network issues

I have 2 computers running ROS and I'm trying to connect them via an Ethernet cable. Both machines are also connected to the Internet via wireless connection. An intel NUC as the master at 10.0.0.2 An ...
user avatar
0 votes
1 answer
29 views

Can multiple clients communicate with the server at the same time?

I have already established a client and a server connection. Now I need to have multiple clients all calling for the same service. How can I achieve this? Originally posted by Pikachu on ROS Answers ...
user avatar
0 votes
1 answer
5 views

How do I communicate between 3 nodes ? (Arduino/QT/Sensors)

I want to establish communication between an IMU sensor ( https://github.com/udmamrl/SpartonCompassIMU/blob/master/src/SpartonCompassIMU.py ) and Arduino+QT. How should I proceed ? I am new to ROS and ...
user avatar
0 votes
1 answer
6 views

How to move any 2 robots simultaneously in gazebo?

I need to put any 2 robots in gazebo and keep them moving simultaneously in a fixed square path. I wanted to know which robot should I use and how should I command them to move? I am using ROS-Indigo ...
user avatar
0 votes
1 answer
8 views

ROS two different nodes in the same package

Hello. My package name is tum_ardrone. Inside the src file I have Autopilot,StateEstimation and UINode. I Created Autopilot2,StateEstimation2 and UINode2 to run two robots. When I run the launch file: ...
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0 votes
1 answer
1 view

Can cmvision run with multiple cameras on the same robot?

Hi, I have the cmvision package working with two different camaras, but when I try to bring up both of them simultaneously, the initial process (doesn't matter which one I bring up) dies. To resolve ...
user avatar
0 votes
1 answer
58 views

Multiple subscriber queue allocation using the same callback

I am creating multiple subscribers using the same callback function as in this post, the code is here. Basically is this: ...
user avatar
0 votes
1 answer
12 views

How to launch multiple turtlebots in real environment?

I want to launch multiple turtlebots in real environment. In this scenario, there are several turtlebots and a remote workstation connected with each other. I want the robots to be controlled ...
user avatar
0 votes
1 answer
11 views

roslaunch ssh error

Hi, I am getting the following error when attempting to launch a series of nodes across two machines.. beaglebone black (ubuntu@bbone): ubuntu 14.04 LTS (3.14 kernel) and ROS indigo Linux ...
user avatar
0 votes
1 answer
32 views

Couldn't find an AF_INET address for [hostname]

when Running ROS across multiple machines ,it can share master for two machines,but when run a node ,it appear something like Couldn't find an AF_INET address for [hostname],I don't know why. when I ...
user avatar
0 votes
1 answer
18 views

Changing tf_prefix for a gazebo plugin?

Hello all, I'm working on a gazebo simulation for multiple husky robots and I'm running into some problems with my tf tree. To set up the simulation, I'm launching each robot in a unique namespace ...
user avatar
0 votes
1 answer
1 view

Multiple subscriptions via subscriber pool

I had a look at the overview of subscribing but nothing is mentioned about short cutting via having a subscriber pool. Then initialize the subscribers inside one ...
user avatar
0 votes
1 answer
26 views

Simulation of multiple Husky robots

Hello all, I'm relatively new to ROS and I'm working on simulation of multiple Clearpath Huskies running some simple obstacle avoidance code that I've written. I've installed and used the husky_gazebo ...
user avatar
0 votes
1 answer
1 view

Echoing custom messages over SSH error

I have a node running on an embedded platform publishing a custom message (just a float32[]). I have a ros master running on a different machine, and both ...
user avatar
0 votes
1 answer
66 views

How to communicate between multiple ROS master?

I have two PCs in one robot. The PCs are connected using one router. PC1 is selected as ROS master. I have another two PCs in another robot. The PCs are connected using another router. PC3 is selected ...
user avatar
0 votes
2 answers
80 views

How can I subscribers multiple topics to get data at the same time (python)?

Hi, Am new to ROS and I need a little help. There are 4 topics (robot0/sonar1, robot0/sonar2, ...) of same type (sensor_msgs/Range). I need to process these 4 values together. ...
user avatar
0 votes
1 answer
16 views

Best practice: one git repo per package?

Is it against ROS best practices, in our post-stack world, to have multiple ROS packages in a single Git repo? Conversely, is it ok to have a git repo with several very related packages within? I know ...
user avatar
0 votes
1 answer
1 view

Addressing messages using different topics vs. using in-message identifier

Suppose we have one control node ns_a/control and multiple device nodes ns_b_[1|2|3|...]/device (i.e. for 2 device nodes it would be ns_b_1/device, ns_b_2/device). I want to send a control message m1 ...
user avatar