message size limit

Question

In one of my nodes I get in a service call

a message of over a gigabyte was predicted in tcpros. that seems highly unlikely, so I'll assume protocol synchronization is lost.

In this case the msg is really 1+ Gig. Is is possible to increase the messages size limit temporary for this service call?

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Originally posted by Wolf on ROS Answers with karma: 7555 on 2015-04-24

Post score: 2

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Original comments

Comment by cyborg-x1 on 2015-04-24:
WTF? 1 Gigabyte? What are you transmitting there?

Comment by Wolf on 2015-04-26:
is kind of a map stitched from many images, sent once from the node that creates is to the node that uses it

Answer 1

The message size limit in ROS is hardcoded. It should be possible to change it, but you'll need to modify roscpp and recompile it to do so.

A quick search on github turns up four locations that might be producing your error message: https://github.com/ros/ros_comm/search?utf8=%E2%9C%93&q=gigabyte

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Originally posted by ahendrix with karma: 47576 on 2015-04-25

This answer was ACCEPTED on the original site

Post score: 1

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Original comments

Comment by Wolf on 2015-04-26:
Thank you for the hint! I managed to compress the data before transferring it, which works around the issue as well....