-record(packet,{                % using Big-Endian, This is Network!
        HEAD  = 16# 0000 002A,  % 42, no comment, simple 42
        VERS  = 16# 0000 0001,  % protocol version
        SIZE  = 16# 0000 0000,  % sizeof(crypted_data); //max 4294967295 byte (4GB) or 8#00, then max 65536 byte (64KB) ;
        DATA  = 16# 0000 0000,  % crypted_data
        TAIL  = 16# 0000 0000,  % needed magic const, for end packet
        CRC32 = 16# ffff ffff   % CRC32(crypted_data); - 4 byte
}
).