Confused about real lab functionality vs. video tutorial

[calepat]

Hi, I connected to real robot lab for the first time and things were not working as expected. I would like to know if I forgot to initialize something, despite having followed the steps in the video tutorial. Here were my main problems:

1. rostopic echo /scan showed nothing
2. rostopic list didn’t have anything camera-related
3. rviz, I suppose understandably, wasn’t able to visualize the LaserScan with topic /scan

I was able to move the robot just fine with teleop so I don’t expect it was a connection problem. As a separate question, my rosrun command ($ rosrun scan_test scan_test.py) didn’t seem to do anything despite it working in simulation. With a real robot are we supposed to use roslaunch?

[munn33b]

Which ROSJect are you using with Real Robot Lab?

[calepat]

The turtlebot. It’s the first part of the project of the course I’m following (ROS basics in 5 days)

[munn33b]

You could use either of 3 ROSJects for Real Robot Lab. They seem to be well suited for TurtleBot3 Real Robot Lab.

[munn33b]

With this ROSJect “ROS Basics Real Robot Project”, I was able to run Turtlebot3 in Simulation and also topic was publishing when connected to Real Robot.

roslaunch turtlebot3_gazebo put_robot_in_world.launch

In another Terminal

rosrun gazebo_ros gazebo

[roalgoal]

@calepat It looks like for some reason the lidar motor did not start. It shouldn’t happen again, but if it does, you can turn it on with:

rosservice call /start_motor "{}"

as for the camera related topics, they are not available in the TurtleBot3, but you don’t need them for this project. I’ll update the information.

[mizzonimirko]

I suggest actually calling that command every time it does not work