equence, there is no means to send heartbeats internally.
   Sometimes, however, the need to connect to a registry may arise.
   The Desk pattern is an example where it makes sense 
   to register a publisher.
   But then, there is no means to internally send heartbeats
   proving that the publisher is still alive.
   For this case, a simple solution 
   for periodic publishers is available:
   a heartbeat proxy that is implemented as a subscriber
   receiving data from the publisher and 
   sending a heart