The following link:

• Text: Information on the APN binary protocols
• URL: http://developer.apple.com/library/ios/#documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/Chapters/CommunicatingWIthAPS.html

In README.md is broken.

I think that the right URL is now https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/Appendixes/BinaryProviderAPI.html#//apple_ref/doc/uid/TP40008194-CH106-SW5