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RLException Error in TurtleBot3 [closed]

asked 2022-09-07 07:29:45 -0600

madangt gravatar image

updated 2022-09-07 23:11:31 -0600

ravijoshi gravatar image

I am using ROS Noetic in Ubuntu 20.04. I followed each and every step given in robotis e-manual. However, when I run the following command

roslaunch turtlebot3_bringup turtlebot3_robot.launch

I receive the following message:

RLException: ERROR: unable to contact ROS master at [http://192.168.0.123:11311] The traceback for the exception was written to the log file

I have checked the connections, the IP addresses, the bashrc files of both the robot and the remote PC. I have redone the entire setup process for at least 6 times as of now but no solution has been found.

Kindly help me.

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Closed for the following reason the question is answered, right answer was accepted by madangt
close date 2023-03-01 22:13:29.302953

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answered 2022-09-07 23:16:25 -0600

ravijoshi gravatar image

It seems that you are running turtlebot on a remote PC. The turtlebot is unable to find ROS master thus throws the error.

  1. Please set the ROS_MASTER_URI on remote machine.
  2. Please set the ROS_IP on every machine.

Please check the following page for more info: http://wiki.ros.org/robotican/Tutoria...

You may have to set /etc/hosts file in every machine. Please check.

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I checked the ROS_Master URI in the turtlebot3 and also the Host IP. Still, the same issue.

I will check the /etc/hosts and get back to you

madangt gravatar image madangt  ( 2022-09-07 23:58:36 -0600 )edit

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Asked: 2022-09-07 07:29:45 -0600

Seen: 342 times

Last updated: Sep 07 '22