sending files to server and receiving feedback - objective-c

Question

I have this code who send a file to my server:
NSData *data = [NSData dataWithContentsOfFile:path];
NSMutableString *urlString = [[NSMutableString alloc] initWithFormat:#"name=thefile&&filename=recording"];
[urlString appendFormat:#"%#", data];
NSData *postData = [urlString dataUsingEncoding:NSASCIIStringEncoding
allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:#"%d", [postData length]];
NSString *baseurl = #"http://websitetester.com/here.php";
NSURL *url = [NSURL URLWithString:baseurl];
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];
[urlRequest setHTTPMethod: #"POST"];
[urlRequest setValue:postLength forHTTPHeaderField:#"Content-Length"];
[urlRequest setValue:#"application/x-www-form-urlencoded"
forHTTPHeaderField:#"Content-Type"];
[urlRequest setHTTPBody:postData];
NSURLConnection *connection = [NSURLConnection connectionWithRequest:urlRequest delegate:self];
[connection start];
NSLog(#"File Send to server!");
this code works perfectly but I would like to receive a return from the server, the php file at the end of the code I show:
<?php
if(...){
...
echo "Data Received";
}else{
...
echo "Error in server";
}
?>
All I'm trying is receive this echo in php and show an alert inside my app, how code I can implement inside my code to do that?
EDIT
Hey I find a code who receive the return data in objetive-c, the code is:
NSURLResponse* response;
NSError* error;
NSData* result = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&response error:&error];
NSString *returnString = [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];
NSLog(#"return: %#",returnString);
and now the code works the way I expected.