I have recently started doing development on the iPhone. It’s great fun. I am particularly interested in the Push aspect of this. I’m also a big fan of Python.

There’s a number of RESTful things that can be done with Ruby on Rails. However, the whole ‘packaged application’ thing is quite new to that framework. To Django, it’s the staple diet of how to get things done. So I’m currently part way through a generic application for Django for sending APN (Apple Push Notification) requests as well as dealing with the feedback connection.

Currently I have the push side working quite well. Just a warning, this is my first stab at this and it requires Python 2.6, or the relevant backports for ssl and json installed on 2.5.

So how do we use it? Well rather easy. First you need to set up your certificates with Apple. You’ll need to set up a specific AppID and provisioning profile for your application (i.e. you can’t use *).

The guide on Apple’s site covers how to do this. Python needs it in a combined PEM format to work. Other sites claim you have to export from Keychain Access and that you’ll need to convert both to .pem. I only had to convert the private key:

openssl pkcs12 -in pkey.p12 -out pkey.pem -nodes -clcerts cat cert.pem pkey.pem > iphone_ck.pem

Now, it’s just case of making your iPhone app register with push and getting a unique ID. You have to use your real phone to do this. If you’re in a hurry and just want to test it out you can cheat and just pop this in applicationDidFinishLaunching delegate.