[ros-users] subscribeParam question in rospy

Ken Conley kwc at willowgarage.com
Thu May 27 22:54:11 UTC 2010

Hi Mike,

This feature isn't available in rospy currently.

 - Ken

On Thu, May 27, 2010 at 3:19 PM, Mike Purvis
<mpurvis at clearpathrobotics.com> wrote:
> Hey all,
> I'm getting started on some work involving Parameter Server, and have a few
> quick questions regarding the rospy interface.
> According to the documentation of the XMLRPC API, there's a subscription
> functionality that I'd like to take advantage of, to avoid polling for
> configuration updates:
> http://www.ros.org/wiki/ROS/Parameter%20Server%20API
> The rospy overview docs don't seem to include this method.
> http://www.ros.org/wiki/rospy/Overview/Parameter%20Server
> However, looking at the source in paramserver.py, there's clearly the
> following method defined:
> def subscribe_param(self, key, registration_args)
> But it's not clear what the "registration args" tuple is. It seems to end up
> at the following call, inside masterdata.py:
> def register_param_subscriber(self, param, caller_id, caller_api)
> Is there an example somewhere of how to register the appropriate callback to
> use subscribeParam from python?
> Thanks,
> Mike Purvis
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