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#pragma mark - notifier methods

// Notifier 
// NOTE: this uses GCD to trigger the blocks - they *WILL NOT* be called on THE MAIN THREAD
// - In other words DO NOT DO ANY UI UPDATES IN THE BLOCKS.
//   INSTEAD USE dispatch_async(dispatch_get_main_queue(), ^{UISTUFF}) (or dispatch_sync if you want)

-(BOOL)startNotifier
{
    SCNetworkReachabilityContext    context = { 0, NULL, NULL, NULL, NULL };
    
    // this should do a retain on ourself, so as long as we're in notifier mode we shouldn't disappear out from under ourselves
    // woah
    self.reachabilityObject = self;
    
    

    // first we need to create a serial queue
    // we allocate this once for the lifetime of the notifier
    self.reachabilitySerialQueue = dispatch_queue_create("com.tonymillion.reachability", NULL);
    if(!self.reachabilitySerialQueue)
    {
        return NO;
    }
    
#if __has_feature(objc_arc)
    context.info = (__bridge void *)self;
#else
    context.info = (void *)self;
#endif
    
    if (!SCNetworkReachabilitySetCallback(self.reachabilityRef, TMReachabilityCallback, &context)) 
    {
#ifdef DEBUG
        NSLog(@"SCNetworkReachabilitySetCallback() failed: %s", SCErrorString(SCError()));
#endif
        
        //clear out the dispatch queue
        if(self.reachabilitySerialQueue)
        {
#if NEEDS_DISPATCH_RETAIN_RELEASE
            dispatch_release(self.reachabilitySerialQueue);
#endif
            self.reachabilitySerialQueue = nil;
        }
        
        self.reachabilityObject = nil;

        return NO;
    }
    
    // set it as our reachability queue which will retain the queue
    if(!SCNetworkReachabilitySetDispatchQueue(self.reachabilityRef, self.reachabilitySerialQueue))
    {
#ifdef DEBUG
        NSLog(@"SCNetworkReachabilitySetDispatchQueue() failed: %s", SCErrorString(SCError()));
#endif

        //UH OH - FAILURE!
        
        // first stop any callbacks!
        SCNetworkReachabilitySetCallback(self.reachabilityRef, NULL, NULL);
        
        // then clear out the dispatch queue
        if(self.reachabilitySerialQueue)
        {
#if NEEDS_DISPATCH_RETAIN_RELEASE
            dispatch_release(self.reachabilitySerialQueue);
#endif
            self.reachabilitySerialQueue = nil;
        }
        
        self.reachabilityObject = nil;
        
        return NO;
    }
    
    return YES;
}

-(void)stopNotifier
{
    // first stop any callbacks!
    SCNetworkReachabilitySetCallback(self.reachabilityRef, NULL, NULL);
    
    // unregister target from the GCD serial dispatch queue
    SCNetworkReachabilitySetDispatchQueue(self.reachabilityRef, NULL);
    
    if(self.reachabilitySerialQueue)
    {
#if NEEDS_DISPATCH_RETAIN_RELEASE
        dispatch_release(self.reachabilitySerialQueue);
#endif
        self.reachabilitySerialQueue = nil;
    }
    
    self.reachabilityObject = nil;
}

#pragma mark - reachability tests

// this is for the case where you flick the airplane mode
// you end up getting something like this:
//Reachability: WR ct-----
//Reachability: -- -------
//Reachability: WR ct-----
//Reachability: -- -------
// we treat this as 4 UNREACHABLE triggers - really apple should do better than this

#define testcase (kSCNetworkReachabilityFlagsConnectionRequired | kSCNetworkReachabilityFlagsTransientConnection)

-(BOOL)isReachableWithFlags:(SCNetworkReachabilityFlags)flags
{
    BOOL connectionUP = YES;
    
    if(!(flags & kSCNetworkReachabilityFlagsReachable))
        connectionUP = NO;
    
    if( (flags & testcase) == testcase )
        connectionUP = NO;
    
#if	TARGET_OS_IPHONE
    if(flags & kSCNetworkReachabilityFlagsIsWWAN)
    {
        // we're on 3G
        if(!self.reachableOnWWAN)
        {
            // we dont want to connect when on 3G
            connectionUP = NO;
        }
    }
#endif
    
    return connectionUP;
}

-(BOOL)isReachable
{
    SCNetworkReachabilityFlags flags;  
    
    if(!SCNetworkReachabilityGetFlags(self.reachabilityRef, &flags))
        return NO;