iOS Registering for Azure Notification Hub Template Msg

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {

    //create the template
    NSString *templateName = @"alertTemplate";
    NSString *template = @"{\"aps\": {\"alert\": \"$(alert)\"}}";

    //create my specific tags that I want to receive
    NSMutableSet *setTags = [NSMutableSet set];
    [setTags addObject:[NSString stringWithFormat:@"user_id:%lld", userId]];

    //register this device
    hub = [[SBNotificationHub alloc] initWithConnectionString:azureNotificationHubListen notificationHubPath:azureNotificationHubPath];
    [hub registerTemplateWithDeviceToken:deviceToken name:templateName jsonBodyTemplate:template expiryTemplate:@"0" tags:setTags completion:^(NSError *error) {
        if (error) {
            NSLog(@"Error registering for notifications with Azure: %@", [error localizedDescription]);
        } else {
            NSLog(@"Registered to receive notifications with tag: %@", [setTags allObjects]);
        }
    }];

}