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rospy logging not printing across computers

asked 2012-08-07 11:56:05 -0600

jker gravatar image

updated 2014-01-28 17:13:16 -0600

ngrennan gravatar image

The Setup: Two computers, both running various nodes. Computer A is the master where the launch file is run from that launched all the nodes being used. Computer B is a slave running several nodes as directed by Computer A.

The Problem: While running a python node, I noticed that none of the rospy.log*() calls print anything to the screen on A when it is called by a node on B. However calling the rospy logging functions while on A prints on A (I haven't tried checking B, as I'm not sure how to force ROS terminal output).

My Attempts: I've tried all of the logging levels, and manually setting the log level of the node, but no dice. As a workaround I've just been publishing debug information to a topic from the node in B and echoing the topic on A, but this is a messy way to get it done and it would be simpler to just have everything print in the main terminal the launch file is run from.

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What does rxconsole show?

joq gravatar imagejoq ( 2012-08-07 14:01:58 -0600 )edit

I can only ssh into the computers, so I can't use and GUI interfaces.

jker gravatar imagejker ( 2012-08-08 03:29:19 -0600 )edit

Have you tried ssh -X?

joq gravatar imagejoq ( 2012-08-08 04:10:05 -0600 )edit

That did the trick, and rxconsole does seem to receive the messages. Thanks.

jker gravatar imagejker ( 2012-08-08 08:34:46 -0600 )edit

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answered 2012-08-08 06:37:41 -0600

bhaskara gravatar image

updated 2016-07-20 17:59:22 -0600

130s gravatar image

This is expected behavior: from http://www.ros.org/wiki/roslaunch/Arc... ,

"Remote processes do not forward their stderr/stdout to your local console. In general, nodes should be reporting important information using ROS' builtin logging mechanisms (i.e. rosconsole for roscpp, logout/logerr for rospy, etc...). This allows you to view this important information via the rosout tools."

On your local machine where you do have an X-server, start up a terminal, set the ROS_MASTER_URI environment variable to point to the master on computer A, then run rqt_console.

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Asked: 2012-08-07 11:56:05 -0600

Seen: 217 times

Last updated: Jul 20 '16