We should have some sort of 'cache' -> https://github.com/aerogear/aerogear-unifiedpush-server/blob/0.4.0/src/main/java/org/jboss/aerogear/connectivity/message/cache/APNsCache.java

but we never made really use of it.

NOTE: this needs to be limited to 10 objects, per iOS variant, ideally not on a single, but globally .