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2022-11-28 16:20:45 -0500 received badge  Notable Question (source)
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2021-05-19 16:26:46 -0500 marked best answer 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 Subscriber. But in the following Wikipedia page (https://en.wikipedia.org/wiki/Publish...), under heading TOPOLOGIES, it is mentioned that in a broker-based pub-sub system, the messages are routed via broker (i.e. master). So, I request someone who is aware of the latest ROS-1 communication design to help in clarifying this doubt please. Thanks.

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2021-02-13 10:57:09 -0500 marked best answer Trouble installing ROS Noetic Ninjemys on Ubuntu 20.04

Getting following error, please help:--

Err:1 http://packages.ros.org/ros/ubuntu focal/main amd64 libgazebo11 amd64 11.0.0-2~focal                                                                                                                
  Connection failed [IP: 140.211.166.134 80]
E: Failed to fetch http://packages.ros.org/ros/ubuntu/pool/main/g/gazebo11/libgazebo11_11.0.0-2~focal_amd64.deb  Connection failed [IP: 140.211.166.134 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
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2021-01-11 23:27:46 -0500 marked best answer Regarding transport layer protocols in ROS2 Foxy Fitzroy

Hi,

In the Concepts page of ROS2 ( https://index.ros.org/doc/ros2/Concep... ) it is said that "Note however that even the reliable policy in ROS 2 is implemented using UDP, which allows for multicasting if appropriate."

So, is there no TCP transport protocol in ROS2 Foxy ?

My another comprehensive question is: What all transport layer protocols are available in ROS2 Foxy Fitzroy ? (as for example in ROS 1 Noetic, TCP and UDP are supported)

2021-01-11 23:26:53 -0500 edited question Does RMW implementations explicitly deal beyond application layer code ?

Does RMW implementations explicitly deal beyond application layer code ? Hi, As the middleware implementations are abst

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2021-01-11 12:22:24 -0500 commented answer Where is the source code for different middleware implementations in ROS2 Foxy

@tfoote: Hey hi, sorry to say that you have a misunderstanding here. I never asked about "end-to-end encryption" on this

2021-01-11 12:12:08 -0500 commented answer Where is the source code for different middleware implementations in ROS2 Foxy

@gvdhoorn: The list in https://index.ros.org/doc/ros2/Concepts/DDS-and-ROS-middleware-implementations/#supported-rmw-imp

2021-01-11 12:05:25 -0500 commented answer Where is the source code for different middleware implementations in ROS2 Foxy

This starts to go in the same direction as #q369222: please don't ask follow-up questions in comments under questions wi

2021-01-11 12:00:16 -0500 commented answer Where is the source code for different middleware implementations in ROS2 Foxy

@gvdhoorn: I wanted to know the end-to-end capabilities of ROS 2. How good it is! Is it the best! And so on. Also, genui

2021-01-11 11:58:47 -0500 commented answer Where is the source code for different middleware implementations in ROS2 Foxy

@gvdhoorn: I wanted to know the end-to-end capabilities of ROS 2. How good it is! Is it the best! And so on.

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2021-01-11 11:31:19 -0500 commented question Foxy: Regarding changing QoS policies in pre-provided QoS profiles in ROS2

@gvdhoorn : Actually, by developers, I meant the maintainers of ROS2 code, and not the ones who would code for building

2021-01-11 11:22:12 -0500 commented answer Where is the source code for different middleware implementations in ROS2 Foxy

Thanks @gvdhoorn for your so much help with your good responses. Two further doubts:- a) As per https://www.ros.org/r

2021-01-11 11:21:55 -0500 commented answer Where is the source code for different middleware implementations in ROS2 Foxy

Thanks @gvdhoorn for your so much help with your good responses. Two further doubts:- a) As per https://www.ros.org/rep

2021-01-11 11:08:50 -0500 asked a question Does RMW implementations explicitly deal beyond application layer code ?

Does RMW implementations explicitly deal beyond application layer code ? Hi, As the middleware implementations are abst

2021-01-11 10:26:50 -0500 commented answer Regarding transport layer protocols in ROS2 Foxy Fitzroy

@gvdhoorn: Thanks for your response but I have few doubts in your response and I request you humbly to clarify them plea

2021-01-11 10:03:08 -0500 commented question Where is the source code for different middleware implementations in ROS2 Foxy

@gvdhoorn: Sorry if "standard" created any confusion. I simply meant if I can see the code of different middleware imple

2021-01-10 23:35:31 -0500 asked a question Regarding transport layer protocols in ROS2 Foxy Fitzroy

Regarding transport layer protocols in ROS2 Foxy Fitzroy Hi, In the Concepts page of ROS2 ( https://index.ros.org/doc/r

2021-01-10 23:20:19 -0500 asked a question Foxy: Regarding changing QoS policies in pre-provided QoS profiles in ROS2

Foxy: Regarding changing QoS policies in pre-provided QoS profiles in ROS2 For ROS2 Foxy Fitzroy: In the following ROS2

2021-01-10 23:08:27 -0500 asked a question Where is the source code for different middleware implementations in ROS2 Foxy

Standard way to see code for different middleware implementation in ROS2 Foxy Would we be able to see the standard code

2021-01-10 22:59:37 -0500 marked best answer Confusion in ROS2 default middleware

I have noted that FastRTPS is the default middleware in ROS2 Foxy. But again, there are 2 version of FastRTPS too: a) FastRTPS dynamic (rmw_fastrtps_dynamic_cpp) and b) Plain FastRTPS (rmw_fastrtps_cpp).

So which one exactly is the default middleware in ROS 2 Foxy Fitzroy ?

2021-01-10 22:59:32 -0500 commented answer Confusion in ROS2 default middleware

Thank you @jacobperron

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2021-01-09 11:41:36 -0500 asked a question Confusion in ROS2 default middleware

Confusion in ROS2 default middleware I have noted that FastRTPS is the default middleware in ROS2 Foxy. But again, ther

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2020-12-29 03:57:27 -0500 marked best answer Doubt in ROS-2 design document about topics

In the ROS-2 design page "https://design.ros2.org/articles/ros_...", it is written by @Dirk Thomas as

The DDS DataReader and DataWriter as well as DDS topics are not exposed through the ROS API.

My question is: How can we say that the DDS topics are not exposed through the ROS API, when using "ros2 topic list", we do access the topics ? Does these topics do not belong to DDS implementation ? What was the actual concept that was meant to be conveyed by the quoted text above ?

I request to help me in clearing this doubt.

2020-12-29 03:57:02 -0500 commented answer Doubt in ROS-2 design document about topics

Thanks @tfoote for clearing my doubt.

2020-12-29 03:56:17 -0500 commented answer Doubt in ROS-2 design document about topics

Thanks @jacobperron for your answer, it is helpful.

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2020-12-28 10:19:25 -0500 edited question Doubt in ROS-2 design document about topics

Doubt in ROS-2 design document about topics In the ROS-2 design page "https://design.ros2.org/articles/ros_middleware_in