- (void)upnp:(NSString *)url soap_service:(NSString *)soap_service soap_action:(NSString *)soap_action soap_arguments:(NSString *)soap_arguments completion:(void (^)(NSDictionary *, NSError *))block {

// Set Body
    [request setHTTPBody:[post_xml dataUsingEncoding:NSUTF8StringEncoding]];

    [self getRequest:request completionBlock:^(NSData *responseObject, NSError *error) {
        if(responseObject) {
            NSDictionary *response = [XMLReader dictionaryForXMLData:responseObject error:nil];
            block(response, nil);
        } else {
            if(block) block(nil, error);
        }
    }];   

- (void)getRequest:(NSURLRequest *)request completionBlock:(void (^)(NSData *data, NSError *error))completionBlock
{
    [NSURLConnection sendAsynchronousRequest:request
                                       queue:[NSOperationQueue mainQueue]
                           completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
                               completionBlock(data,error);
                           }];
}

-(IBAction)discover:(id)sender {
    [[SonosManager sharedInstance] addObserver:self forKeyPath:@"allDevices" options:NSKeyValueObservingOptionNew context:NULL];
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    SonosController *controller = [[SonosManager sharedInstance] currentDevice];
    [controller trackInfo:^(NSString *artist, NSString *title, NSString *album, NSURL *albumArt, NSInteger time, NSInteger duration, NSInteger queueIndex, NSString *trackURI, NSString *protocol, NSError *error){

        NSLog(@"Artist: %@", artist);
        NSLog(@"Title: %@", title);
        NSLog(@"Album: %@", album);
        NSLog(@"Album Art: %@", albumArt);
        NSLog(@"Time: %d", (int)time);
        NSLog(@"Duration: %d", (int)duration);
        NSLog(@"Place in queue: %d", (int)queueIndex);
        NSLog(@"Track URI: %@", trackURI);
        NSLog(@"Protocol: %@", protocol);

    }];
}