Question about Input/Output Streams (sockets)

-(void)connectToHost {
	NSLog(@"in connect to host!");
	[NSStream getStreamsToHost:host port:13 inputStream:&iStream outputStream:&oStream];
	[iStream retain];
	NSLog(@"istream = %@",iStream);
	[oStream retain];	
	[iStream setDelegate:self];	
	[oStream setDelegate:self];	
	[iStream scheduleInRunLoop:[NSRunLoop currentRunLoop]	 
					   forMode:NSDefaultRunLoopMode];
		[oStream scheduleInRunLoop:[NSRunLoop currentRunLoop]	 
					   forMode:NSDefaultRunLoopMode];	
	[iStream open];	
	[oStream open];
}

- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode {
	NSLog(@"in handleEvent, eventcode = %i", eventCode);
    switch(eventCode) {			
        case NSStreamEventHasBytesAvailable:  {
			NSLog(@"in has bytes");
            if(!data) {				
                data = [[NSMutableData data] retain];				
            }
			
            uint8_t buf[1024];			
            unsigned int len = 0;			
            len = [(NSInputStream *)stream read:buf maxLength:1024];
			
            if(len) {				
                [data appendBytes:(const void *)buf length:len];
				NSLog(@"len: %i", len);
                //[bytesRead setIntValue:[bytesRead intValue]+len];				
            } else {				
                NSLog(@"no buffer!");				
            }
			
            break;			
        }
	}
}