mbta-v2 provides a wrapper for the MBTA-realtime API. The available 0.1 version should be considered an alpha version. That said, MBTAClient can perform all requests available via the MBTA-realtime API.

The header for mbta-v2 would be included like so:

#import <mbta-v2.h>

The shared MBTAClient is used to retrieve data from the MBTA's API.

Creating a request for all the routes available at a given stop

[[MBTAClient shared] retrieveRoutesByStop:@"70065" withCompletion:^(NSData *data, NSError *error)
{
    NSArray *routes = [MBTAConverter convertRoutesByStop:data];
    for (MBTARoute *route in routes)
        NSLog(@"%@", route.routeID);
}];

}

In this case, for stop id 70065, which is Porter Square, you'd see the following output:

931_ 933_

These represent the two Red Line routes that are available at said stop.

Some basic information about the MBTA-realtime API, from their documentation:

*MBTA-REALTIME API INTRODUCTION MBTA-realtime provides RESTful web services to provide data about MBTA services. Data are provided in XML, JSON, and JSON-P formats. You will need to register for a free API key to use the API, but you can use the open development key (provided in the query examples throughout this document and at [(http://realtime.mbta.com/Portal/Home/Download)]) to start playing with the API right now.

MBTA-realtime API v2 document, covering all aspects of the API: [(http://realtime.mbta.com/Portal/Home/Documents)]

1.1 Use of MBTA data Access to the MBTA GTFS-realtime feeds is governed by the language in the MassDOT Developers License Agreement [(http://www.eot.state.ma.us/developers/)] in addition to the following conditions: • The MBTA reserves the right to suspend the data feed, modify the feed, or modify elements of the feed at any time at the MBTA's sole and absolute discretion. • The MBTA does not guarantee any technical support of any kind to users. • No user may execute polling commands more often than every 10 seconds. A user that polls more often than that or otherwise overtaxes the MBTA's system may be suspended or terminated from the data feed.*