see : http://aerogear-dev.1069024.n5.nabble.com/aerogear-dev-Sync-Day-3-Sync-takes-Manhattan-td6074.html

In this epic we will define how the server can send sync events to the client and how the client can manage these connections.

Previously we have put together a polling solution. In this epic we will expand that to include support for selecting a listening strategy and adding a push based listener.