NSString *urlStr = @"192.168.178.26";
if (![urlStr isEqualToString:@""])
{
	NSURL *website = [NSURL URLWithString:urlStr];
	if (!website)
	{
		NSLog(@"%@ is not a valid URL");
    return;
	}
	NSHost *host = [NSHost hostWithName:[website host]];
	[NSStream getStreamsToHost:host port:3258 inputStream:&iStream  outputStream:&oStream];
	[iStream retain];
	[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 *)theStream handleEvent:(NSStreamEvent)streamEvent
{
	NSString *io;
	
	if (theStream == iStream) io = @">>";
	else io = @"<<";
	
	NSString *event;
	switch (streamEvent)
	{
		case NSStreamEventNone:
			event = @"NSStreamEventNone";
			resultText.font = [UIFont fontWithName:@"Helvetica" size:10.0];
			resultText.textColor = [UIColor whiteColor];
			resultText.text = [[NSString alloc] initWithFormat: @"Can not connect to the host!"];
			break;
		case NSStreamEventOpenCompleted:
			event = @"NSStreamEventOpenCompleted";
			break;
		case NSStreamEventHasBytesAvailable:
			event = @"NSStreamEventHasBytesAvailable";
			if (theStream == iStream)
			{
				uint8_t buffer[1024];
				int len;
				while ([iStream hasBytesAvailable])
				{
					len = [iStream read:buffer maxLength:sizeof(buffer)];
					if (len > 0)
					{
						NSString *output = [[NSString alloc] initWithBytes:buffer length:len encoding:NSASCIIStringEncoding];
						NSData *theData = [[NSData alloc] initWithBytes:buffer length:len];
						if (nil != output)
						{
							//NSArray *arr = [output componentsSeparatedByString:@"\n"];
							
							resultText.font = [UIFont fontWithName:@"Helvetica" size:10.0];
							resultText.textColor = [UIColor whiteColor];
							resultText.text = [[NSString alloc] initWithFormat: @"%@\n%@", resultText.text, output];
							NSLog(@"%@", output);
							[output release];
						}
					}
				}
			}
			break;
		case NSStreamEventHasSpaceAvailable:
			event = @"NSStreamEventHasSpaceAvailable";
			
			break;
		case NSStreamEventErrorOccurred:
			event = @"NSStreamEventErrorOccurred";
			resultText.font = [UIFont fontWithName:@"Helvetica" size:10.0];
			resultText.textColor = [UIColor whiteColor];
			resultText.text = [[NSString alloc] initWithFormat: @"Can not connect to the host!"];
			break;
		case NSStreamEventEndEncountered:
			event = @"NSStreamEventEndEncountered";
            [theStream close];
            [theStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
            [theStream release];
            theStream = nil;
			
			break;
		default:
			event = @"** Unknown";
	}
	
	NSLog(@"%@ : %@", io, event);
}

http://www.iphonedevsdk.com/forum/iphone-sdk-development/2998-how-socket-connection.html

da testare

socket with iphone

ios

Objective C