MAC. Field 64 or 128.
Must be 16 characters.
List<int>? get mac => _mac;
set mac(List<int>? value) { final v = value; assert( v == null || v.length == 8, 'MAC should be null or 8 bytes.', ); if (v == null) { _bmp[64] = false; _mac = null; } else { _bmp[64] = true; _mac = value; } }