Modified do_handshake() to send a ROBOT payload and return the result.

def do_handshake_with_robot(self):  # type: ignore
    """Modified do_handshake() to send a ROBOT payload and return the result.
    """
    try:
        # Start the handshake using nassl - will throw WantReadError right away
        self._ssl.do_handshake()
    except WantReadError:
        # Send the Client Hello
        len_to_read = self._network_bio.pending()
        while len_to_read:
            # Get the data from the SSL engine
            handshake_data_out = self._network_bio.read(len_to_read)
            # Send it to the peer
            self._sock.send(handshake_data_out)
            len_to_read = self._network_bio.pending()

    # Retrieve the server's response - directly read the underlying network socket
    # Retrieve data until we get to the ServerHelloDone
    # The server may send back a ServerHello, an Alert or a CertificateRequest first
    did_receive_hello_done = False
    remaining_bytes = b''
    while not did_receive_hello_done:
        try:
            tls_record, len_consumed = TlsRecordParser.parse_bytes(remaining_bytes)
            remaining_bytes = remaining_bytes[len_consumed::]
        except NotEnoughData:
            # Try to get more data
            raw_ssl_bytes = self._sock.recv(16381)
            if not raw_ssl_bytes:
                # No data?
                break

            remaining_bytes = remaining_bytes + raw_ssl_bytes
            continue

        if isinstance(tls_record, TlsHandshakeRecord):
            # Does the record contain a ServerDone message?
            for handshake_message in tls_record.subprotocol_messages:
                if handshake_message.handshake_type == TlsHandshakeTypeByte.SERVER_DONE:
                    did_receive_hello_done = True
                    break
            # If not, it could be a ServerHello, Certificate or a CertificateRequest if the server requires client auth
        elif isinstance(tls_record, TlsAlertRecord):
            # Server returned a TLS alert
            break
        else:
            raise ValueError('Unknown record? Type {}'.format(tls_record.header.type))

    if did_receive_hello_done:
        # Send a special Client Key Exchange Record as the payload
        self._sock.send(self._robot_cke_record.to_bytes())

        if self._robot_should_finish_handshake:
            # Then send a CCS record
            ccs_record = TlsChangeCipherSpecRecord.from_parameters(
                tls_version=TlsVersionEnum[self._ssl_version.name]
            )
            self._sock.send(ccs_record.to_bytes())

            # Lastly send a Finished record
            finished_record_bytes = RobotTlsRecordPayloads.get_finished_record_bytes(self._ssl_version)
            self._sock.send(finished_record_bytes)

        # Return whatever the server sent back by raising an exception
        # The goal is to detect similar/different responses
        while True:
            try:
                tls_record, len_consumed = TlsRecordParser.parse_bytes(remaining_bytes)
                remaining_bytes = remaining_bytes[len_consumed::]
            except NotEnoughData:
                # Try to get more data
                try:
                    raw_ssl_bytes = self._sock.recv(16381)
                    if not raw_ssl_bytes:
                        # No data?
                        raise ServerResponseToRobot('No data')
                except socket.error as e:
                    # Server closed the connection after receiving the CCS payload
                    raise ServerResponseToRobot('socket.error {}'.format(str(e)))

                remaining_bytes = remaining_bytes + raw_ssl_bytes
                continue

            if isinstance(tls_record, TlsAlertRecord):
                raise ServerResponseToRobot('TLS Alert {} {}'.format(tls_record.alert_description,
                                                                     tls_record.alert_severity))
            else:
                break

        raise ServerResponseToRobot('Ok')