关于ios发送数据转换成16进制 的问题

先贴上代码：

//
 // UDPDemoViewController.m
 // UDPDemo
 //
 // Created by Leo Lin on 3/12/14.
 // Copyright (c) 2014 Leo Lin. All rights reserved.
 //

#import "UDPDemoViewController.h"

@interface UDPDemoViewController ()

@end

@implementation UDPDemoViewController

(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
 {
 self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
 if (self) {
 // Custom initialization
udpSocket = [[AsyncUdpSocket alloc] initWithDelegate:self];

NSError *error = nil;

if (![udpSocket bindToPort:0 error:&error])
{
    NSLog(@"Error binding: %@", error);
    //return;
}

[udpSocket receiveWithTimeout:-1 tag:0];

NSLog(@"Ready");


}
 return self;
 }


(void)viewDidLoad
 {
 [super viewDidLoad];
 // Do any additional setup after loading the view from its nib.
 }


(void)didReceiveMemoryWarning
 {
 [super didReceiveMemoryWarning];
 // Dispose of any resources that can be recreated.
 }


-(IBAction)SendUDPMessage
 {
 NSString *host = @"192.168.1.103";
 int port = 60000;
 NSString *msg = @"iPhone";
NSData *data = [msg dataUsingEncoding:NSUTF8StringEncoding];
[udpSocket sendData:data toHost:host port:port withTimeout:-1 tag:tag];


}

@end

现在发送的是文本格式，我想怎么才能16进制发送出去啊！