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2012-09-17 20:31:43 -0500 commented answer Error: unable to communicate with master!

the tutorial says this: Note: If you still see /turtlesim in the list, it might mean that you don't have $ROS_HOSTNAME environment variable defined as described in Network Setup - Single Machine Configuration. but that was what got me in that connection problem without solving the problem!

2012-09-17 20:31:02 -0500 commented answer Error: unable to communicate with master!

Thanks my connection/master works again. however the name of turtlesim is still not changed to my_turtle after doing $ rosrun turtlesim turtlesim_node __name:=my_turtle

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2012-09-17 11:40:04 -0500 answered a question Error: unable to communicate with master!

@prasanna, thanks but: which code brings me to the .bashrc file (literally) and I assume I should put the following code in literally: "export ROS_HOSTNAME=localhost export ROS_MASTER_URI=http://localhost:11311"

@hi michikarg, that link is where my troubles started! as described

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2012-09-17 11:08:10 -0500 commented question newbie needs help with specific error during tutorial

Hi what do you mean with an other console, just a new terminal? that doesnt work unfortunatley

2012-09-17 11:06:11 -0500 commented question Error: unable to communicate with master!

what exactly do you mean with the shell? yess I tried the code roscore again after setting the master to localhost, but my question is very newbie: what should I fill in for "localhost" and "http://localhost:11311" literally, and where can i find this information

2012-09-17 11:01:51 -0500 answered a question newbie needs help with specific error during tutorial

other console you just mean an other terminal? unfortunately this doesnt work

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2012-09-17 09:10:11 -0500 asked a question newbie needs help with specific error during tutorial

during the tutorial I tried the following but it showed the corresponding error as follows: "$ rosrun turtlesim turtlesim_node" "[ERROR] [1347908650.466741617]: [registerPublisher] Failed to contact master at" "[localhost:11311]. Retrying.."

Can anyone tell me how to fix this?!

(When trying to reset my network as said in ros/networksetup as follows, it keeps being messed up the same way: "$ export ROS_HOSTNAME=localhost $ export ROS_MASTER_URI=http://localhost:11311" Maybe I didn't do this correctly, how do I know for sure what to put in "localhost" and "http://localhost:11311"?)

2012-09-17 08:16:29 -0500 asked a question Error: unable to communicate with master!

Doing the tutorials everything was fine until half way tutorial 5: Understanding Nodes part 1.6. At the step of using this command: $ rosrun turtlesim turtlesim_node __name:=my_turtle The name wasn't changed to "my_turtle", but as insisted by the tutorial this could happen because something going on with the rosnetworksetup so I did the following:

$ export ROS_HOSTNAME=localhost $ export ROS_MASTER_URI=http://localhost:11311

Now it doesnt work at all anymore and it gives the error: unable to communicate with master! leave alone that I can change the name of turtlesim_node.

What can I do about it to fix this, or at least undo what I did?! And what exactly should I fill in for "localhost" and "http://localhost:11311" and where can I find these things?

Many thanks!