If you want to develop mobile apps with Drupal as backend you might want to check out this SDK client video comparing Drupalgap and the ADG app (using this library).

About www.app-development.guide: slides and (premium) tutorials

PLEASE NOTE: This module has been replaced by a more general Javascript Drupal client:
https://github.com/jbeuckm/drupal-client

Requirements

1. An installation of Drupal 7.x
2. Services Module 3.4+ (implements the CSRF token for updated REST security)
3. REST Server module enabled
4. A Titanium project - probably works with most versions since this only uses Ti.Network.HTTPClient

Usage

Create a Service and enable (at least) the Resources called "system" and "user". Rename config.js.example to config.js and enter the url of your Drupal install and your service endpoint.

Get a session

var drupal = require('drupal');

drupal.systemConnect(
	//success
	function(sessionData) {
		var uid = sessionData.user.uid;
		Ti.API.info('session found for user '+uid);
	},
	//failure
	function(error) {
		Ti.API.error('boo :(');
	}
);

Create an account

var user = {
	name: 'my_new_username',
	pass: 'my_new_password',
	mail: 'my_email@titaniumdrupal.com'
};

drupal.createAccount(user,
	//success
	function(userData) {
		Ti.API.info('yay!');
	},
	//failure
	function(error) {
		Ti.API.error('boo :(');
	},
	headers //optional
);	

Login

var my_username = "<DRUPAL USERNAME>";
var my_password = "<DRUPAL PASSWORD>";

var userObject;

drupal.login(my_username, my_password,
	function(userData) {
		Ti.API.info('User ' + userData.uid + ' has logged in.');
		userObject = userData;
	},
	function(err){
		Ti.API.error('login failed.');
	}
);

Modify User Info

This updates an account profile on the server. userObject is a user object that may have been received from a login request (see above).

drupal.putResource("user/"+userObject.uid, userObject, 
	function(userData) {
		Ti.API.info('user has been updated.');
	},
	function(err){
		Ti.API.error('user update failed.');
	}
);
	

Make Requests

The workhorse function of the interface is makeAuthenticatedRequest(config, success, failure, headers). There are a few helper functions included for posting/getting nodes, getting views, uploading files, etc. But they typically all construct a call to makeAuthenticatedRequest. This function should facilitate most things that people want to do with Drupal in a mobile environment. It's also easy to use `makeAuthenticatedRequest' to make requests agaist custom Services.