Oh. You know nothing too. A protocol can handle the intermittent connection. A user can't handle instant message not delivered instantly, and it has nothing to do with a protocol, only with Apple's restriction.
Oh, there ARE ways to deliver a meaningful message, but they require transmitting full unencrypted message text over APNS! (this also results in app developers being capable to snoop on this traffic too - while currently data is exchanged directly between a user server and his client, bypassing client developers).
Next time comment on something you have any clue about.