Questions tagged [master]

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ROS master running in docker container not accessible by host machine

I'm trying to encapsulate my ROS nodes in docker containers for deployment, but I'm unable to contact the docker container from the host computer. I believe this issue is related to my docker ...
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Doubt in ROS-1 communication design

Hi, While going through ROS-1 wiki pages, at several places I read that the message between a publisher and subscriber does not route via Master. Rather the message travels directly from Publisher to ...
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Why the Master is there ? Can't there be communication without Master?

Hi, I have gone through almost all of ROS-1 wiki pages. And so, I am aware that in ROS-1 (I am yet to look into ROS-2), before 2 nodes start to communicate via pub-sub feature, both needs to register ...
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Unable to comunicate ROS - Matlab

Dear ROS community! I have a problem...I configured my matlab environment as ROS master and i want to connect external Linux machine. I adjusted ROS_MASTER_URI inside the linux machine, after that i ...
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Roscore without peer to peer

Hello, Might be an odd question. Is there a way for Roscore (i.e Master) to disable p2p and act as a server transmitting data back and forth instead of letting peers communicating between them ...
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ros log: "Shutdown request received [user request] " , what it means

[33m[ WARN] [1571817304.679612403]: Shutdown request received.[0m [33m[ WARN] [1571817304.679718067]: Reason given for shutdown: [user request][0m release communication Originally posted by 942951641@...
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Multi-navigation robot in RViz

Hi guys, I just finished to built one navigation robot and it worked perfectly in RViz, and now I want to build another navigation robot, and show two robots navigate simultaneously in RViz, and robot ...
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XMLRPC in ROS System

According to what I read, RPC, which stands for Remote Procedure Call, is a technique used to enable different procedures in different machines or systems call each other. For example, the procedure X ...
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Serial Connection to Hokuyo from Master

Hi, I am currently getting the error: ...
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WARNING: ROS_MASTER_URI [http://localhost:11311] host is not set to this machine' and nodes 'Couldn’t find an AF_INET address for [localhost]'

Hi, I have been running ros nodes in my machine but suddenly I got these erros every time when I'm running nodes: Master: ...
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/clock topic not recived on master

I am building a G-mapping based SLAM robot . Master - This is my desktop . roscore is running here 192.168.1.6 is the IP address Robot - The robot is hooked to a RPI3 . I have added this to the ....
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Unable to setup Kinetic on docker

Hello all, I'm working on having a docker container to use later on the robot. My approach is to have a multiple machine setup where the master is in the container and Gazebo and all sorts of other ...
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Is it possible to run different ros distributions and still communicate with each other in a distributed computing setup?

If I have two computers connected to the same network and if computer A has ROS Indigo installed and if computer B has ROS Kinetic installed, can I run the master in computer A and export the ...
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How ROS nodes communicate offline?

i am able to use ROS nodes to communicate offline without the internet. The thing is isnt that they transfer data using TCP and ros master mange nodes using XMLRPC server. Can anyone help to clear my ...
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Problems with communication between multiple machines

So, i have this setup in my ros network: My PC (172.16.49.9) as a publisher of the topic /controlInfo Robot's PC (172.16.49.1 aka 172.17.1.1) as the ROS Master Raspberry Pi hardware module (172.17.1....
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Docker ROS "unable to communicate with master!"

Hi, I have ros indigo running through docker and when i try to run rostopic list on a new terminal with roscore open in another, I get "ERROR: Unable to communicate with master!" I don't ...
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please create subscriber to the marker (warn)

i did: rosrun using_markers basic_shapes and got the warning: please create a subscriber to the marker I dont get it i want to ...
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Connect 2 ros board

Hi, I have 2 arm boards running ros. I need to share the topics between the boards. I want to use a wired connection, is the uart a good choice? (I've got also lan or usb on both boards) Is it ...
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Running roscore and nodes in separate computers

Due to limited storage space, I would like to run my roscore and certain important packages in one system (A Jetson TX1 running ...
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Cannot connect ros master when run with sudo

As the title, I can run well a bag normally, but when I add sudo, it says [FATAL] [1471510924.482740850]: ROS_MASTER_URI is not defined in the environment. which ...
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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 ...
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Check master ros node is started C++

Hello, Is there a way in C++ to check whether the master ros node is setup? I initially believed ros::init() would return false, but the return type is false... I have quickly looked on the internet ...
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Roscore on virtual machine

Hi, I'm trying to run roscore on virtual machine in cloud and connect robots to it. I have installed ros on vm. I have a openvpn server running as well, so robots could communicate with cloud and vice ...
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Can I play a rosbag to simulate data originally recorded from a remote ros master?

I have data recorded into a bag file on my "local" machine that was generated from a remote ros master. When I issue a rosbag play command on the file (which I checked and is ok), nothing ...
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Tests if ros master is not running using rostest

I like to write a test for a feature that detects if ros master is not running. Using rostest, which automatically starts ros master, is there a way to achieve this?...
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Any use case of communication of nodes on different netowkrs?

I want to know if there are use cases that nodes on different(distributed) networks communicate with each other, using single ROS Master. It's like: PC A on Network A: ROS Master and node A(A1, A2...)...
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Master API & Types

While exploring the Master API, I experienced something I didn't expect : After the last publisher ( and all subscribers ) on a topic is gone, the topic still has a type and is still returned by ...
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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 ...
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ROS Master Communciation Error - BeagleboneBlack

Our setup: Laptop running Ubuntu, serially connected to a BeagleboneBlack running Debian Wheezy. From the laptop, SSH-ing serially into the BBB is successful. Roscore is running on latop. However, ...
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Avoiding overhead when nothing is subscribed *to a pipeline*

I know that publish doesn't do anything if nothing is subscribed to a node. A while back, you guys helped me avoid work in my own callbacks if nothing is subscribed to my node. But what about the ...
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single rosmaster multi-turtlebots 2

Hi Ros community, Has anyone successfully implemented single Master network on many turtlebots 2 as a distributed multi-robots? ADDED: If some has implemented this on the actual turtlebots 2, if so ...
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Node on ROS_MASTER -> loosing connection

Hi, I am currently developing a security framework for a robot. The control software as well as the security framework run on the ros master as different nodes with the security node publishing the ...
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Is this RPC communication?

i'm using ssh for ROS network communication. i setted ROS_IP, ROS_MASTER_URI up IP Address that is working roscore. i'm working roscore, roslisp_reql in local. and i'm working turtlesim_node in ssh. ...
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Accesing MASTER_API using roscpp

Hello, I'm trying to use some functions of the MASTER_API with C/C++ but I'm not finding any references to that. I've already seen a lot of times the pythin code to do that but I'd like to know if ...
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close roscore after running with roslaunch

Hi there, I have a roslaunch that i run two node with it in my pc, but when i close both of them, roscore are still is running, any tip appreciated. it is the output of my roslaunch: ...
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ROS Matlab I/O Subscribers don't work

Hi All, I'm trying to use the ROS-Matlab I/O package to publish and subscribe to topics from a roscore on a networked machine. I have gone through the network setup, and this is the current state of ...
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auto-starting new master

Why does roslaunch auto-start a new master for every remote machine? Things I've tried: -playing w/ every variation of default tag for machines defined in the .launch Things that work but extremely ...
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Is Latching handled by the Master or Node?

Is Latching handled by the Master or Node? Thanks, Aaron Originally posted by unknown_entity1 on ROS Answers with karma: 104 on 2014-03-07 Post score: 0
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master slave and changing IP addresses

i'm on the university network and they can't offer static ip addresses. the main problem is when driving the robot through different wifi networks and getting a new IP. i have the robot set up as the ...
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rosjava_core + turtlesim = compatibility problems?

Hi, I just wanted to test how the rosjava_core (java master) is able to handle communication between C++ nodes. So I tried to: -launch java implementation of master (by simple script in my: jroscore ...
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Foreign Relay Spams Topic

I have two ROS masters running on the same machine (on different ports) that I want to publish/subscribe a topic between one another. I've been using Foreign Relays for this purpose, since I've ...
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What will happen when run package between different ROS distributions?

If I run groovy package on host and connect to PR2's fuerte master, what will happened? Is this action will cause some fault? Thank you~ Originally posted by sam on ROS Answers with karma: 2570 on ...
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rosmaster zombie

I know zombie node can exist but is zombie master possible too? With the following step, I keep getting rosgraph.masterapi.Master instance even after I stop ...
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rospy master status

Is there a tool for checking if the rosmaster is up using rospy? Something along the lines of roscpp's ros::master::check()? Originally posted by kmaroney on ROS Answers with karma: 204 on 2013-04-22 ...
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Multiple remote users of ROS master: nickname lookup failure

I am setting up a ROS master that I want students to be able to access, without giving them administrator privileges on that machine. For this example a student laptop has the name vaio4 and has ...
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How to run multiple roscore/master in a single machine?

Hi, A superset question is here, where it is said that we have to change the ROS_MASTER_URI to run the 2nd master. I have tried running the 1st master with ROS_MASTER_URI=http://localhost:11311 (...
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Gazebo stuck waiting for Master in Groovy

I am attempting to run the latest public Groovy gazebo build under Ubuntu 12.04, but the process hangs waiting for the master: ...
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Skip Master Chooser

I am developing an android app with rosjava, and I am setting the Master URI programatically. Therefore, the Master Chooser screen does nothing for me. Is there a way I can skip it totally? ...
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Roslaunch can't find my node

FUERTE I have a few machines correctly connected in ROS (core is able to ssh to them and launch nodes). I'm writing a node which for now resides in my ROS workspace (/home/myuser/ROS_WORKSPACE). I'm ...
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How does rostest work with catkin?

The camera_info_manager package uses rostest to launch a ROS graph for unit testing. Launching it explicitly works: $ rostest camera_info_manager unit_test.test ...
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