[maemo-developers] How to ensure only HTTP requests from the device can be accepted in a web app?

[From: Sivan Greenberg]

Hi list,

 I'm developing and application that sends very small amounts of data
over HTTP ReST to an http server, and want to restrict request to
those only coming from the device itself (the N900 running
Maemo/MeeGo). This will be of-course complemented with a user login
and limitation of how many "pings" such a user can do to the server a
day.

 What would be the way to achieve this? Has anyone done/ tried
something like this before? (I thought about reading some hardware
identified off the device, but then again- how do I make sure an IMEI
is an RX-51 one?

Your response highly appreciated,

-Sivan