code: @Override
      public byte[] deliverSmResp(int commandStatus, int sequenceNumber, String messageId) {
          PDUByteBuffer buf = new PDUByteBuffer(SMPPConstant.CID_DELIVER_SM_RESP,
                  commandStatus, sequenceNumber);
          buf.append(messageId);
          return buf.toBytes();
      }
docs: /*
  (non-Javadoc)
  
  @see org.jsmpp.util.PDUComposer#deliverSmResp(int, int, String)