[cf-dev] observation persistence

[Simon Bernard <contact@xxxxxxxxxxxxxxx>]

Hi,
   In Leshan, we have an ObservationRegistry interface. We provide an 
in memory implementation. The idea should be to let users implements 
persistence if they need it.
   But for observe, we  must be able to persist the californium state 
too. Should it exist a way to do that? (I look at the code, and I don't 
think so)
  I suppose if you want to do that we should mainly persist data in 
org.eclipse.californium.core.network.Matcher.  (exchangesByMID, 
exchangesByToken)
   Does it make sense ?
Simon