How can WhatsApp push notification be so frequent?

As far as I know , there is a limit on the number of push notifications that an app can send to a device within a short period of time. Moreover, the Apple Push Notification server only keeps a buffer of 1 message per application per device for push notification messages. It means that if Whatsapp server sends push notification so fast , the buffer will be overwritten with the new messages and the previous one will be lost. It seems not the case. I tested Whatsapp with many messages send in a short period of time ( around 10 messages in 5 seconds) , all of the 10 push notifications were delivered.
Answer:

If your test device is connected to the push servers, the APNS buffer doesn't really affect the behavior - push notifications are delivered immediately without queueing. The buffer comes into play when your device isn't reachable. Try turning off the radio, sending a bunch of messages to your device, then wait a few more minutes before turning the radio back on. The behavior should be closer to what you are expecting in this question.

Michael Donohue at Quora Visit the source

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Other answers

I don't think it is true, both APNS and GCM delivers all the messages sent after the device is back online from a offline mode. Most messengers like whatsapp, viber work like this. If buffers are overwritten how does the whole concept of offline messages work then?

Prithiviraj Damodaran

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