@Override
    public TransportControlMessageState getState() {
        return TransportControlMessageState.LOWER_TRANSPORT_BLOCK_ACKNOWLEDGEMENT;
    }
Calculates the block acknowledgement payload.
<p>
This method will set the segO bit to 1
</p>

@param segN number of segments
mesh/src/main/java/no/nordicsemi/android/mesh/control/BlockAcknowledgementMessage.java