I saw one reference to limits on silent push notifications: \"Silent pushes are rate limited—a handful per hour\"
(From WWDC 2013: http://devstreaming.apple.com/vide
Yes and No. Apple says they are but you can send as many as you want and the APNS server will take care of the excess. See there: http://www.objc.io/issue-5/multitasking.html