static uint8_t aBlock[] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

after this

    aBlock[5] = dir;           ( direction of message)
    aBlock[6] = ( address ) & 0xFF; (Hardware address of device)
    aBlock[7] = ( address >> 8 ) & 0xFF; (Hardware address of device)
    aBlock[8] = ( address >> 16 ) & 0xFF; (Hardware address of device)
    aBlock[9] = ( address >> 24 ) & 0xFF; (Hardware address of device)
    aBlock[10] = ( sequenceCounter ) & 0xFF; (counter that never repeats)
    aBlock[11] = ( sequenceCounter >> 8 ) & 0xFF; (counter that never repeats)
    aBlock[12] = ( sequenceCounter >> 16 ) & 0xFF; (counter that never repeats)
    aBlock[13] = ( sequenceCounter >> 24 ) & 0xFF; (counter that never repeats)
    aBlock[15] = ( ( ctr ) & 0xFF );  ( a counter value that is incremented for every 16 Byte Block)