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Prefix transformations from OpenCR

asked 2018-02-08 19:58:07 -0500

qrfaalnz gravatar image

I am trying to run rrt_exploration on my turtlebot3. I need to prefix all per-robot nodes, topics, and transforms with a per-robot name such as "robot_1". I can do this the usual way for all nodes and topics with <group ns="robot_1"> in my launch file and for almost all transforms with <param name="tf_prefix", value="robot_1"/> in the node that provides the transform.

However, this does not work for transforms that are published by the OpenCR via rosserial_python such as odom. How can I change the name of the transforms published by the rosserial_python node? Re-flashing the openCR is not an option, as this must be extensible to multi-robot systems.

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How about adding tf_prefix support to rosserial_python, and only the python on the computer would have to be changed?

lucasw gravatar image lucasw  ( 2018-02-20 20:10:39 -0500 )edit

Hello! Did you ever solve this? Having the same issue and the answers to this question were not correct.

AmateurHour gravatar image AmateurHour  ( 2018-08-01 14:18:49 -0500 )edit

I solved this similarly to @lucasw's comment. Modify rosserial_python to accept a tf_prefix parameter and change Publisher's handlePacket() to add the prefix to child_frame_id and header.frame_id of each tf/tfMessage. Unfortunately I can't post code.

qrfaalnz gravatar image qrfaalnz  ( 2018-08-01 15:00:35 -0500 )edit

Ok! Do you think you could post the code as an answer to my question https://answers.ros.org/question/2993... ?

AmateurHour gravatar image AmateurHour  ( 2018-08-01 15:14:06 -0500 )edit

or could you perhaps elaborate on where to find Publisher's handlePacket()?

AmateurHour gravatar image AmateurHour  ( 2018-08-01 15:29:42 -0500 )edit

That is part of rosserial in SerialClient.py. Clone rosserial into your catkin_ws and you should be able to search for it. Look at how other parameters are handled.

qrfaalnz gravatar image qrfaalnz  ( 2018-08-01 16:25:49 -0500 )edit

TurtleBot3 supports multi-robot application. This link might be help you http://emanual.robotis.com/docs/en/pl...

Darby Lim gravatar image Darby Lim  ( 2018-08-01 19:15:23 -0500 )edit

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answered 2018-03-16 12:40:51 -0500

hasauino gravatar image

The package has been updated, now you don't need namespace prefixing for single robot. There is an example launch file (simple.launch) you can check it out.

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answered 2018-02-20 19:49:30 -0500

Gilbert gravatar image

Yes, you can change the topic name.

  1. Add remap in your launch file. I recommend this way. <remap from="original_topic" to="changed_topic_name"/>

  2. Change topic name and update fimware in OpenCR scripts using arduino. Open the OpenCR example -> Turtlebot3 -> Turtlebot3 burger & waffle -> turtlebot3_core. and change topic name in turtlebot3_core_config.h please see : http://emanual.robotis.com/docs/en/pl...

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Asked: 2018-02-08 19:58:07 -0500

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Last updated: Mar 16 '18