Skype stays connected because it uses the voip backgrounding type. As for push notifications, with iOS 7 you can send silent push notifications to do trigger updates in the background. There is also the background fetch API, but its behavior is inconsistent.
Skype stays connected because it uses the voip backgrounding type. As for push notifications, with iOS 7 you can send silent push notifications to do trigger updates in the background. There is also the background fetch API, but its behavior is inconsistent.