What is a ROS2 Topic? - ROS2 Tutorial 6

[@RoboticsBackEnd]

Thank you for watching! 🔥 To go further with ROS2, check out this complete and step-by-step ROS2 course 👉 rbcknd.com/ros2-for-beginners

[@bhanuprakashkonatham6709]

For reading from key board After entering "ros2 run turtlesim" (06:48) I am getting error like this " usage: ros2 run [-h] [--prefix PREFIX] package_name executable_name ... ros2 run: error: the following arguments are required: executable_name, argv " Can you please tell me why this is happening

[@djrednaksi]

I think I've had a similar problem. Which Ubuntu version do you have?

[@yksilkturdabitecek]

You have to add node name for execute. In this video, he used a shortcut tab to see completable options. Than added node name and executed again.

[@sriraghavtanikella]

Double click tab to see further options that need to be entered, if there's only one, it will autofill

[@thejoojoo9999]

Small question : when I do call rqt_graph like you at 5:17 it only shows the talker and listener nodes and not the _ros2cli_ node although I do have a terminal window running echo /chatter. How come I don't see the echo node ?

[@RoboticsBackEnd]

Maybe try to enable the "debug" box or smth similar

[@sriraghavtanikella]

You just need to reload the rqt page with that small button on the top left corner

[@tee-nw5vx]

i unable to run turtlesim or rqt_graph on wsl. why?

[@sarthakdas815]

What does groups mean when you changed it from 2 to 0 why did we do this what does more groups show?

[@wkinne1]

When I click on the course, the 10 hour one you say is free, it says it costs $17.99. Am I looking at the wrong thing?

[@RoboticsBackEnd]

The KZbin crash course (2h50) is free, but you have to pay for the 10h+ one (on top of publishing free tutorials I also need to pay my rent) . With this pricing you get a complete course for less than 2$ an hour :)

[@abhijitkaluri8052]

haha@@RoboticsBackEnd

[@pal432-m5v]

thnk you for this

[@muhammadinamulhaq5786]

Question : Can a node be a topic as well?

[@RoboticsBackEnd]

A node is not a topic. A node will be able to publish/subscribe to a topic. And a topic will be created inside a node, but those 2 are different entities

[@gabrielmenegassodefranca7106]

std_msgs/msg/String