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2014-01-28 17:31:16 -0500 marked best answer Problem running erratic_robot.

Hello,

I have downloaded the possible tools to run the erractic_robot in gazebo but when I try to roslaunch (roslaunch erratic_description erratic_empty_world.launch) it, it gives me an error:

[erratic_description] is not a package or launch file name

I have the erractic_description and I can look into the folder that the roslaunch is trying to access but it keeps denying me.

Any help is MUCH appreciated!

Thanks in advance!

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2012-05-03 05:59:37 -0500 commented answer Publishing from Workstation but can't echo from turtlebot

How would I start to configure the /etc/hosts

2012-05-02 13:50:04 -0500 asked a question Publishing from Workstation but can't echo from turtlebot

Hello,

After following the Turtlebot networking setup and verifying that both the workstation and the turtlebot laptop are connected via rostopic list I've run into a problem: On the workstation I run:
rostopic pub -r10 /hello std_msgs/String "hello"
On the turtlebot laptop I run:
rostopic echo /hello

However, nothing prints on the turtlebot laptop. What's even more baffling is that when I run rostopic list on turtlebot I can see /hello listed.

Any help is much appreciated

2012-05-02 08:17:34 -0500 commented answer Turtlebot Dashboard not coming up.

Okay so when I run the roscore. It gives me the error again and under it says the OLD ROS_MASTER_URI. How do I re-write it using commands? I have used the one provided on tutorials but it does not seem to do it. I have also over-wrote on the .bashrc but it seems to night have recognised it.

2012-05-02 07:58:09 -0500 commented answer Turtlebot Dashboard not coming up.

I just tried running roscore then bringing up turtlebot_dashboard but I got no luck

2012-05-02 07:57:25 -0500 commented answer Turtlebot Dashboard not coming up.

When I run it I still get that warning like I showed above. Does that matter?

2012-05-02 07:49:46 -0500 asked a question Turtlebot Dashboard not coming up.

Hello,

I have a problem with turtlebot dashboard not popping up on the screen. When I run the command:

rosrun turtlebot_dashboard turtlebot_dashboard

I get a message that looks like this:

Unable to register with master node [http://143.215.120.237:11311]: master may not be running yet. Will keep trying

One time it actually ran the dashboard and everything was greyed out. The tutorial said that the ROS_MASTER_URI must not be set correctly but it is.

I am pinging to the turtlebot, turtlebot is on, and I have ssh'ed in to it already. (I don't know if any of this makes a difference)

Although, when I roscore on MY laptop it give me an error saying:

WARNING: ROS_MASTER_URI [http://143.215.120.237:11311] host is not set to this machine

I have made an edit in my .bashrc to run the correct ROS_MASTER_URI.

What can I do for my dashboard to pop up correctly?

Thanks in advance! :D

2012-04-14 11:08:05 -0500 commented answer ERROR: Unable to communicate with master!

Well we actually did the roscore and tried to see if that worked. When we ran 'rostopic list' without using roscore it listed out a lot multiple things. Once we roscored and tried to 'rostopic list' it listed out only 2 things and still the issue was not fixed. What else can we do?

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2012-04-12 17:45:53 -0500 asked a question ERROR: Unable to communicate with master!

Hello,

My team and I have successfully went through this tutorial:

        http://www.ros.org/wiki/Robots/TurtleBot/Network%20Setup

Everything worked fine. We uploaded the follower demo and used keyboard to move turtlebot around.

Then we decided to get fancy and ping another 2 computers to the netbook on turtlebot. It actually worked! We actually ran the follower demo successfully on all 3 computers one after the other and then one of use used the keyboard teleop and it worked as well.

Unfortunately, the success was short-lived. Soon after our third member left. We tried to access the netbook from our laptops and we kept getting an error when we just tried to 'sudo service turtlebot stop':

    ERROR: Unable to communicate with master!

We checked our setting over 5 times and saw that everything from ROS_HOSTNAME and ROS_MASTER_URI was set EXACTLY like the tutorials and nothing was wrong but we kept getting the same error over and over. (Keeep in mind it ran without any issues for about the last 8-10 times we uploaded it something.)

If anyone could point us in the right debugging direction that would be great! We have googled and searched the answers.ros.org forum and we found nothing.

Any help would be GREATLY appreciated!

Thank you

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2012-03-26 18:57:36 -0500 asked a question turtlebot_marker error in RViz.

Hello,

I have followed every bit of instruction on:

http://ros.org/wiki/turtlebot_interactive_markers/Tutorials/UsingTurtlebotInteractiveMarkers

When the RViz GUI pops up everything looks fine and dandy until I go to turtlebot_marker where it states this:

turtlebot_marker
Error getting time of latest transform between /base_link and /odom: (error code: 1)

What does that mean and how can I fix it?