Detects iBeacons in the area and parses their data (mac app using CBCentralManager)

gistfile1.m

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    self.manager = [[CBCentralManager alloc] initWithDelegate:self queue:nil options:nil];
}

-(void)centralManagerDidUpdateState:(CBCentralManager *)central
{
    if (self.manager.state == CBCentralManagerStatePoweredOn)
    {
        [self.manager scanForPeripheralsWithServices:nil options:nil];
    }
}

-(void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
    NSData *advData = [advertisementData objectForKey:@"kCBAdvDataManufacturerData"];
    if ([self advDataIsBeacon:advData])
    {
        NSDictionary *beacon = [self getBeaconInfoFromData:advData];
        NSLog(@"found beacon: %@ with RSSI: %@",beacon, RSSI);
    }
}

- (BOOL)advDataIsBeacon:(NSData *)data
{
    //TODO: could this be cleaner?
    Byte expectingBytes [4] = { 0x4c, 0x00, 0x02, 0x15 };
    NSData *expectingData = [NSData dataWithBytes:expectingBytes length:sizeof(expectingBytes)];
    
    if (data.length > expectingData.length)
    {
        if ([[data subdataWithRange:NSMakeRange(0, expectingData.length)] isEqual:expectingData])
        {
            return YES;
        }
    }
    
    return NO;
}

- (NSDictionary *)getBeaconInfoFromData:(NSData *)data
{
    NSRange uuidRange = NSMakeRange(4, 16);
    NSRange majorRange = NSMakeRange(20, 2);
    NSRange minorRange = NSMakeRange(22, 2);
    NSRange powerRange = NSMakeRange(24, 1);
    
    Byte uuidBytes[16];
    [data getBytes:&uuidBytes range:uuidRange];
    NSUUID *uuid = [[NSUUID alloc] initWithUUIDBytes:uuidBytes];
    
    int16_t majorBytes;
    [data getBytes:&majorBytes range:majorRange];
    int16_t majorBytesBig = (majorBytes >> 8) | (majorBytes << 8);
    
    int16_t minorBytes;
    [data getBytes:&minorBytes range:minorRange];
    int16_t minorBytesBig = (minorBytes >> 8) | (minorBytes << 8);
    
    int8_t powerByte;
    [data getBytes:&powerByte range:powerRange];
    
    
    
    return @{ @"uuid" : uuid, @"major" : @(majorBytesBig), @"minor" : @(minorBytesBig), @"power" : @(powerByte) };
}