-record(packet,{                % using Big-Endian, This is Network!
        HEAD  = 16#0000002A,    % 42, no comment, simple 42
        VERS  = 16#00000001,    % protocol version
        SIZE  = 16#00000000,    % sizeof(crypted_data); //max 4294967295 byte (4GB) or 8#00, then max 65536 byte (64KB) ;
        DATA  = 16#00000000,    % crypted_data
        TAIL  = 16#00000000,    % needed magic const, for end packet
        CRC32 = 16#ffffffff % CRC32(crypted_data); - 4 byte
}
).