Art Net Message Structure for C++ Implementation

   message = new uint8_t[dataSize];
        message[0] = 'A';
        message[1] = 'r';
        message[2] = 't';
        message[3] = '-';
        message[4] = 'N';
        message[5] = 'e';
        message[6] = 't';
        message[7] = 0;
        //OPCODE
        message[8] = hex2int("0x00"); //OpCode Low Byte as per spec
        message[9] = hex2int("0x50"); //OpCode High Byte as per spec
        //VERSION
        message[10] = 0; //ver High
        message[11] = 14; //ver Low
        //SEQUENCE (FRAME)
        message[12] = frame; //current frame number
        //PHYSICAL PORT
        message[13] = 0; //not sure what this should be set to???
        //UNIVERSE
        message[14] = hex2int("0x21"); //universe low byte first (my universe is 1???
        message[15] = 0; //universe high byte
        //DMX LENGTH
        message[16] = 0; //HI Byte
        message[17] = universeSize; //LOW Byte (150)
        //DMX DATA
        for (int i = 0; i < universeSize; i++)
        {
            message[18 + i] = 0;
        }