Wi-Fi connection not alive when sleeping, with iOS4

Question

Knowing that iOS4 wifi support remains valid, he is really happy. However, I got a different experience: I have 2 iPods, iPod 2nd gen and iPod 3rd gen. Both have been upgraded to the beta version of iOS 4. iPod 2g can stay on Wi-Fi while you sleep, and iPod 3g will always turn off Wi-Fi in a dream. I ping both of them while they are in sleep mode, only the iPod 2g retains the echo back.

Can I often indicate what I am doing wrong?

Answer 1

Test with the addition of this on your plist:

UIRequiresPersistentWiFi = YES

With this, wifi is alive throughout the life of your application.