I have the problem that I send an udp Message (broadcast) to a client and get an answer, but this will be displayed two times. When I check the communication an my PC with an UDP listener there is only one message.

May be, someone can give me an info how I can resolve this.

I am using a button to start sending the message!

```
#import "ViewController.h"
#import "GCDAsyncUdpSocket.h"

@interface ViewController ()
{
    long tag;
    GCDAsyncUdpSocket *udpSocket;

}

@end

@implementation ViewController

- (void)setupSocket
{   udpSocket = [[GCDAsyncUdpSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_main_queue()];

    NSError *error = nil;

    if (![udpSocket bindToPort:1000 error:&error])
    {
        NSLog(@"Error binding: %@", error);
        return;
    }
    if (![udpSocket beginReceiving:&error])
    {
        NSLog(@"Error receiving: %@", error);
        return;
    }

    [udpSocket enableBroadcast:YES error: &error];

    NSLog(@"Ready");
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    if (udpSocket == nil)
    {
        [self setupSocket];
    }
}

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

- (IBAction)send:(id)sender{
    NSString *host = @"192.168.2.255";
    if ([host length] == 0)
    {
        NSLog(@"Address required");
        return;
    }

    NSLog(@"%@",host);

    int port = 8888;

    NSString *msg = @"1,0,1,2";

    NSData *data = [msg dataUsingEncoding:NSUTF8StringEncoding];
    [udpSocket sendData:data toHost:host port:port withTimeout:-1 tag:tag];

    NSLog(@"SENT (%i): %@", (int)tag, msg);

    tag++;

}

- (void)udpSocket:(GCDAsyncUdpSocket *)sock didReceiveData:(NSData *)data
        fromAddress:(NSData *)address
        withFilterContext:(id)filterContext
{
    NSString *msg = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

    if (msg)
    {
        NSLog(@"RECV: %@", msg);
        tag++;
        NSLog(@"%li",tag);
    }
    else
    {
        NSString *host = nil;
        uint16_t port = 0;
        [GCDAsyncUdpSocket getHost:&host port:&port fromAddress:address];

        NSLog(@"RECV: Unknown message from: %@:%hu", host, port);
    }
}

@end

```

Here ist the output!

```
2013-09-11 09:49:00.132 udptest[5145:907] 15
2013-09-11 09:49:08.218 udptest[5145:907] 192.168.2.255
2013-09-11 09:49:08.220 udptest[5145:907] SENT (15): 1,0,1,2
2013-09-11 09:49:08.319 udptest[5145:907] RECV: 0,0,0,0,0,0,0,0
2013-09-11 09:49:08.321 udptest[5145:907] 17
2013-09-11 09:49:08.323 udptest[5145:907] RECV: 0,0,0,0,0,0,0,0
2013-09-11 09:49:08.324 udptest[5145:907] 18

```

I would be very grateful if someone could help me.