callback between Publisher and Subscriber via IceStrom
my Publisher is asked distributing command to subscriber, and, the Publisher must got status of the excution. So, how can subscriber feedback status to publisher.
Internet Communications Engine
The simplest way is to publish a feedback proxy in the event notification. One issue that you have to aware of is that you cannot know how many subscribers there are which will respond to the published event, however. This also assumes that the publishers are reachable from the publisher. If that isn't an option, then you could create a topic on the same IceStorm instance to which the subscribers publish events.