From http://www.ros.org/wiki/ROS/Parameter%20Server%20API or from the NodeHandle API (the getParamCached methods) we see that it is possible to have a parameter cached and updated locally on changes. Does the API provide a way to attach a callback function to these updates?
Originally posted by fabiodl on ROS Answers with karma: 43 on 2012-08-31
Post score: 2
Comment by PerkinsJames on 2012-08-31:
This would be useful for me, too.
I don't think so. You have to use getParamCached() each time you want to use the value (no messages are sent by that method).
Dynamic reconfigure provides an alternate API which does provide a callback. That may be better for your use case.
Originally posted by joq with karma: 25443 on 2012-08-31
This answer was ACCEPTED on the original site
Post score: 1
Comment by fabiodl on 2012-08-31:
Sorry, I edit my question, with getCached I meant getParamCached
Comment by jbohren on 2013-07-02:
Added to : http://www.ros.org/wiki/ROS/Patterns/Parameterization#A.22Cached.22_Access_to_the_Parameter_Server