@Override
    final void reassembleLowerTransportAccessPDU(@NonNull final AccessMessage accessMessage) {
        final SparseArray<byte[]> lowerTransportAccessPdu = removeLowerTransportAccessMessageHeader(accessMessage);
        final byte[] upperTransportPdu = MeshParserUtils.concatenateSegmentedMessages(lowerTransportAccessPdu);
        accessMessage.setUpperTransportPdu(upperTransportPdu);
    }
Creates the network layer pdu

@param message message with underlying data
@return Complete pdu message that is ready to be sent
mesh/src/main/java/no/nordicsemi/android/mesh/transport/LowerTransportLayer.java