making a network call during the paused event in iOS

When the user hits the home button and closes the app, I need to log the user out, thus making them have to login each time they open the app. The login sessions are handled through drupal.

If I call this snippet of code while in the app it works, however, if I run it in the paused event of the app, I get an error logging out of drupal

var logout  = Ti.Network.createHTTPClient({
    onload:function(event)
    {
        Ti.API.info("Successfully logged out of drupal");
    },
    onerror: function(event)
    {
        Ti.API.info("Error logging out of drupal");
    },
    timeout:5000
});
logout.open('POST','http://mydomain.com/mobile/user/logout.json');
logout.send();

just logout the user on the resumed/resume event... this will force the same behavior, logging in whenever the app starts

Ok I've found a solution for Android. For iOS this is easy with the pause / resume events as Aaron stated.

For android it took some thinking. Hitting the back button on android is no problem because that takes me out of the app and I have the window set to exitOnClose so it logs me out anyway. I didn't realized that hitting the home button on android simple minimizes the app. The app is still running, technically. With that said, I made an idle timer using setInterval. After a certain amount of time of no input in the app, it will log the user out of drupal and close itself. This is what I came up. It still needs some tuning, but I think this is going to work for me for android

var idleCount    = 0;
var idleInterval = setInterval(timerIncrement, 1000);
 
function timerIncrement()
{
    idleCount = idleCount++;
    Ti.API.info(idleCount);
    if (idleCount > 9)
    {
        clearInterval(idleInterval); 
        var logout = Ti.Network.createHTTPClient({
            onload: function(event)
            {
                Ti.API.info('Successfully logged out of drupal');
                win.close();
            },
            onerror: function(event)
            {
                Ti.API.info('Error logging out of drupal (Possibly, not logged in)');
                win.close(); //Close the window anyway
            },
            timeout:5000
        });
        logout.open('POST','http://mysite.com/mobile/user/logout.json');
        logout.send();
    }   
}
 
win.addEventListener('touchend', function(event)
{
    idleCount = 0;
});

The above will log me out after 10 seconds of idle time. Depending on your use, you can adjust the interval durations to use less resources and increase/decrease the idleCount max. I did 10 seconds as an example.