iOS获取蓝牙外设Mac地址

#pragma mark 发现周边蓝牙服务里的特征

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
    for (CBCharacteristic *character in service.characteristics)
    {
        [peripheral readValueForCharacteristic:character];
        [peripheral setNotifyValue:YES forCharacteristic:character];
    }
}

#pragma mark 接收特征的数据
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
{
    NSString *value = [NSString stringWithFormat:@"%@",characteristic.value];
    NSMutableString *macString = [[NSMutableString alloc] init];
    [macString appendString:[[value substringWithRange:NSMakeRange(16, 2)] uppercaseString]];
    [macString appendString:@":"];
    [macString appendString:[[value substringWithRange:NSMakeRange(14, 2)] uppercaseString]];
    [macString appendString:@":"];
    [macString appendString:[[value substringWithRange:NSMakeRange(12, 2)] uppercaseString]];
    [macString appendString:@":"];
    [macString appendString:[[value substringWithRange:NSMakeRange(5, 2)] uppercaseString]];
    [macString appendString:@":"];
    [macString appendString:[[value substringWithRange:NSMakeRange(3, 2)] uppercaseString]];
    [macString appendString:@":"];
    [macString appendString:[[value substringWithRange:NSMakeRange(1, 2)] uppercaseString]];
    NSLog(@"macString:%@",macString);
}