code: protected final String receivePduSequence () throws DigestException , InternetSCSIException , IOException , SettingsException , InterruptedException {
          final ProtocolDataUnit pdu = connection.receivePdu();
          return receivePduSequence(pdu);
      }
docs: Receives a sequence of Login Request PDUs (as indicated by the {@link LoginRequestParser#isContinueFlag()} and
  returns the concatenated content of the text data segments.
  
  @return the concatenated content of the text data segments
  @throws DigestException
  @throws InternetSCSIException
  @throws IOException
  @throws SettingsException
  @throws InterruptedException