Last modified: 2013-03-25 14:50:29 UTC
For the iOS (iPhone/iPad/iPod Touch) app to show background notifications for user messages and other things, we'll need server-side support to manage device subscriptions and send pings off to Apple's servers. Will also need client-side support to use it.
client side is easy (really, really easy). It's the server part that is critical. I know of two systems that are open source; http://code.google.com/p/apns-php/ and http://www.easyapns.com/php-source but i'm not aware of it's performance and/or featuresets. Probably best to combine the google and ios push services into one system. not sure which one of them would be the easiest to extend for that.