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ROS MODBUS TCP DELTA PLC

I am working on ROS modbus to communicate with PLC to read holding register of Delta AS228P PLC. I have installed the ros modbus device driver package https://github.com/bitmeal/ros-modbus-device-...
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Any Ideas what could be causing this error from a launch file? - TCPROS

I am converting the ros-trimble-bd960 package to read from a socket rather than serial port. I thought this was pretty straight forward as they read the same type of data but I just needed to change a ...
Chase's user avatar
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1 answer
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Number of TCP connections for a "bidirectional" topic?

Hi all, I have a (possibly) simple question: assume if I have two nodes A, B that communicate over a topic "/my_topic", i.e., both nodes subscribe and publish to "/my_topic" using ...
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1 answer
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[ROS Communication] Multiple sockets and ports

Hello, I would like to confirm this: Suppose that there is one publisher. Therefore, it opens a socket. There, any subscriber can connect to the same socket but on different ports, right? Let's say ...
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1 answer
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Communication in ROS and ROS2

ROS uses either TCP/ IP or UDP communication protocol. Different ROS nodes can be run on different machines with different network (not same subnet mask) only with one master provided that each ...
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1 answer
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On what factors is the communication protocol selected while establishing a Topic?

On what factors is the communication protocol selected ? be it TCP or UDP. Are there some other protocols supported as well ? Originally posted by aks on ROS Answers with karma: 667 on 2018-04-16 ...
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1 answer
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How to troubleshoot: protocol synchronization is lost

Suddenly I start seeing this error: [ERROR] [1520525542.826204079] [/rosout]: a message of over a gigabyte was predicted in tcpros. that seems highly unlikely, so I'll assume protocol synchronization ...
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2 answers
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Transform data to a buffer and publish it

lets say I have an std_msgs/String or a sensor_msgs/JointState and I want to publish it without using the normal ros publisher. for the std_msgs/String for example all I have is an std::string ...
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1 answer
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Filtering topic data stream by accesing raw packets

Hi everyone, [Kinetic 1.12.6, Ubuntu 16.04 kernel 4.4.062-generic] We've got the following system topology: The radio platforms act like a HUB so endpoint nodes see each other like if they were ...
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1 answer
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Is the planned ROS1 to ROS2/DDS bridge available yet?

I understand that part of the plan for ROS2 is to support mixed ROS1/ROS2 systems by implementing a bridge module that translates/republishes ROS1 (TCPROS or UDPROS) messages to ROS2 (DDS) and vice ...
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1 answer
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message size limit

In one of my nodes I get in a service call ...
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1 answer
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Does ROS support proxy connections between client/server?

Dear ROS Community, Does ROS support proxy connections (like SOCKS) between client/server (to get through firewalls/VPNs)? Thanks, Aaron Originally posted by unknown_entity1 on ROS Answers with karma:...
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Why am I getting worse performance with UDPROS than TCPROS?

I am doing an experiment that consists on transferring JPG compressed stereo pairs from one node to another at 5Hz. I am measuring the message transfer time using two technologies: UDPROS and TCPROS. ...
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1 answer
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Looking for steps to establish Publisher connection in ROS

My ROS client is having issues connecting Publishers to topics. Subscribers work flawlessly, and then Publishers get setUp, start listening on a Socket. The only ROS topic that is attempting to ...
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1 answer
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Why does not my image_transport ROS application work with UDP?

I am developing a robotic application that sends raw stereo images (computer A) using the image_transport library. Another application receives them (computer B) and synchronizes the stereo pairs and ...
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1 answer
85 views

TCPROS message of over gigabyte error, byte array attached for analysis

Hi ROSAnswers Friends, I have been developing my own Java based ROS Client, and I am receiving the following error: [ERROR] [1365734492.147908029, 3.512000000]: a header of over a gigabyte was ...
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1 answer
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TCPROS client implementation

Hi all! Following my previous opened thread, http://answers.ros.org/question/43810/about-tcp-protocol-implementation/ Instalation: Ubuntu lucid 32bits ROS Fuerte Pharo 1.4 / CogVM version '...
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2 answers
4 views

How to use TCPROS for multi-robot communication

Hi Community, I was wondering if it is possible to use TCPROS to send directed messages to another robot. You could assume that both robots are configurable however desired and are have separate ROS ...
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1 answer
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About TCP protocol implementation

I'm making a client from Pharo smalltalk (Pharo 1.4 with the latest CogVM) (To be used from a different machine of the ROS installed). My first goal is make work the turtle simulator from my client. ...
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3 answers
36 views

specifying tcp port range for nodes

we're extremely port limited and would like to specify a range of ports for nodes to use when communicating with each other. For example: 9000-9500 any ideas how to assign specific ports for node ...
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