gistfile1.m

    
    NSString *deviceUUID = [[NSUserDefaults standardUserDefaults] valueForKey:UUID_USER_DEFAULTS_KEY];
    NSDictionary* params = [NSDictionary dictionaryWithObjectsAndKeys:
                            usernameField.text, @"user[pawsid]",
                            passwordField.text, @"user[password]",
                            deviceUUID, @"user[device_uuid]", nil];
    NSString *urlString = [NSString stringWithFormat:@"%@://%@:%@/api/v2/json/api_users/sign_in",
                           [NSObject TT_PROTOCOL], [NSObject TT_HOST], [NSObject TT_PORT]];
    [[RKObjectManager sharedManager].HTTPClient postPath:urlString parameters:params success:^(AFHTTPRequestOperation *operation, id JSON)
     {
         // Success
         NSLog(@"Success");
     } failure:^(AFHTTPRequestOperation *operation, NSError *error)
     {
         // Error
         NSLog(@"Error");
     }];