namespace renaming

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asked Feb 21

cassander
61 ● 5

updated Feb 21

I have the turtlesim node running at /ajsim/turtle1 It is subscribing to the topic /ajsim/turtle1/command_velocity

I started another node called turtle_teleop_key which publishes the topic /turtle1/command_velocity

The problem is that the node in /ajsim/turtle1 cannot subscribe to the topic at /turtle1/command_velocity

I tried the command, [code] rosrun turtlesim turtle_teleop_key command_velocity:=ajsim/turtle1/command_velocity [/code]

but it doesn't work and the wiki is a little unclear about how the change the namespace. Could someone please tell me how I can make sure they are in the same namespace?

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answered Feb 21

DimitriProsser

6817 ● 23 ● 59 ● 126

updated Feb 22

Have a look at this tutorial.

You could also use:

export ROS_NAMESPACE=/ajsim
rosrun turtlesim turtle_teleop_key

This would run the teleop node under the ajsim namespace, and would allow you to subscribe to the topic.

EDIT:

I do not know of a way to change a node's namespace while it's running. If you don't want to use the ROS_NAMESPACE variable, then you would want to use roslaunch.

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thank you. That worked. I was wondering if there is a way to change the namespace of a node while it is executing... so that it can continue publishing the messages in the new namespace?

cassander (Feb 21)edit

To change the namespace while a node is running?

DimitriProsser (Feb 22)edit

Yes.. is it possible to change the namespace of a node while it is running? If that is not possible, then is it possible to change the namespace of a node while it is being launched on the command line using rosrun without having the export the ROS_NAMESPACE variable?

cassander (Feb 22)edit

namespace renaming

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