问题描述
有时我在接收 APN 时遇到延迟，而在其他时候它工作得很好.
Sometimes I am experiecing a delay while receiving APN , while at other times its working absolutely fine.
我也在 ssl://feedback.sandbox.push.apple.com 连接到反馈服务器，但它没有显示任何数据.
I am also connecting to the feedback server at ssl://feedback.sandbox.push.apple.com , but its not showing any data.
延迟的可能原因是什么?
What are the possible reasons for the delay?
谢谢
推荐答案
如果您的 3G 或 Edge 连接不良(iPhone 使用这些，而不是 wifi，进行推送，除非它们完全不可用)，可能会发生延迟.如果连接断开但设备不知道，它会等到它发出心跳并意识到连接已关闭.
Delay can happen if you've got a bad connection on 3G or Edge (iPhones use those, not wifi, for push unless they're totally unavailable). If the connection is dropped but the device doesn't know it, it'll wait until it does a heartbeat and realizes the connection is closed.
此外，如果您使用的是 iPod Touch，则只有在背光打开或通过 USB 插入时才会保持与推送服务器的连接；否则当背光灯熄灭以节省电量时，wifi 连接将断开，并且它会每半小时轮询一次新通知.
Also, if you're using an iPod Touch, the connection to the push servers will only be maintained while the backlight is on or you're plugged in via USB; otherwise the wifi connection will be dropped when the backlight goes off to save power, and it'll poll for new notifications every half an hour.
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