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ros::param::getCached will not update and gives errors

asked 2016-11-14 14:28:08 -0500

codenotes
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updated 2016-11-15 01:49:09 -0500

gvdhoorn
86574 ●283 ●1432 ●1054 http://cor.tudelft.nl/

Can't seem to make full use of ros::param::getCached....while I CAN retrieve a value that is set on rosmaster, I get this error continuously:

[DEBUG] [1479155346.850264931]: XML-RPC call [subscribeParam] returned an error (-1): [ERROR: parameter [caller_api] is not an XMLRPC URI]

[DEBUG] [1479155346.850767245]: Subscribe to parameter [/boob]: call to the master failed

This message comes from some python validator on the roscore side I think...and there my debugging ability will fail me.

Can I get some insight into what might be going on? My ROS_MASTER_URI is not remarkable and my general ROS nodes operate correctly.

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answered 2016-11-14 15:17:17 -0500

codenotes
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I would add that doing some subsequent research, these errors happen and I fail when using:

ros::param::getCached()

however:

somenodehandle.getParamCached() DOES seem to work.

so I think maybe the docs should specify that ros::param::getCached() is probably not to be used. If you want updated parameters, one needs to go through a valid nodehandle.

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Hm. If you feel this is a bug or an oversight, you could report this to the ros_commissue tracker.

gvdhoorn ( 2016-11-15 01:56:43 -0500 )edit

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Asked: 2016-11-14 14:28:08 -0500

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Last updated: Nov 15 '16

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ros::param::getCached will not update and gives errors