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ROS Communication Protocol [closed]

asked 2012-09-03 06:46:50 -0500

updated 2014-04-20 14:09:20 -0500

ngrennan gravatar image

Hello, Is there a complete documentation for the ROS communication protocol anywhere? (especially explaining the buildup of the XMLrpc messages)

I want to write a very slim ROS independent node in C for it, which does not use any ROS library.

Do I need XML for the Master or is there another simpler possibility of publishing or subscribing topics?



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Closed for the following reason the question is answered, right answer was accepted by cyborg-x1
close date 2015-06-26 04:09:53.578672

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answered 2012-09-03 07:08:00 -0500

Lorenz gravatar image

I guess the conceptual overview wiki page is a good starting point. The master xmlrpc API and slave xmlrpc API and parameter xmlrpc API pages should provide a hopefully complete list of xmlrpc functions that are implemented by the core and that must be implemented (slave api) by a node.

For setting up subscriptions and publications and accessing parameters, xmlrpc will be required. The actual communication on the topics then uses a different binary format. Have a look at the msg wiki page for at least some information. For a really generic implementation of ros in C, you will have to implement a message generator that translates msg files to c files that contain code for serializing and deserializing that message. The serialized message format is actually pretty simple. Best if you have a look at the generated files for C++ or Python to find out more information.

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Is there a documentation for the direct XML format like below (captured by wireshark): <?xml version='1.0'?> <methodResponse> <params> <param> <value><array><data> <value><int>1</int></value> <value><string>Unregistered [/listener] as provider of [/rosout]</string></value> <value><int>1</int>...

cyborg-x1 gravatar image cyborg-x1  ( 2012-09-03 08:06:05 -0500 )edit

Well, that's just normal xmlrpc. Google shows this as first hit.

Lorenz gravatar image Lorenz  ( 2012-09-03 08:08:43 -0500 )edit

Oh, ok, thought that is done by ros, because somewhere in the text it says it was "heavily" changed.

cyborg-x1 gravatar image cyborg-x1  ( 2012-09-03 08:17:36 -0500 )edit

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Asked: 2012-09-03 06:46:50 -0500

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Last updated: Sep 03 '12