private byte[] createAcknowledgementPayload(final int seqZero, final int blockAcknowledgement) {
        final int obo = 0;
        final int rfu = 0;

        final ByteBuffer buffer = ByteBuffer.allocate(6).order(ByteOrder.BIG_ENDIAN);
        buffer.put((byte) ((obo << 7) | (seqZero >> 6) & 0x7F));
        buffer.put((byte) (((seqZero << 2) & 0xFC) | rfu));
        buffer.putInt(blockAcknowledgement);
        return buffer.array();
    }
Creates the acknowledgement parameters.

@param seqZero              Seqzero of the message.
@param blockAcknowledgement Block acknowledgement
@return acknowledgement parameters.
mesh/src/main/java/no/nordicsemi/android/mesh/transport/LowerTransportLayer.java