parts, encoding_flag, msg_type_flag = smpplib.gsm.make_parts(u'Привет мир!\n'*1)
r_pdu = client.send_message(
        source_addr_ton=smpplib.consts.SMPP_TON_INTL,
        #source_addr_npi=smpplib.consts.SMPP_NPI_ISDN,
        # Make sure it is a byte string, not unicode:
        source_addr='******',
        service_type ="USSD",
        ussd_service_op = 0x11,

        its_session_info =b'\x00\x01',
        dest_addr_ton=smpplib.consts.SMPP_TON_INTL,
        #dest_addr_npi=smpplib.consts.SMPP_NPI_ISDN,
        # Make sure thease two params are byte strings, not unicode:
        #Test Code
        destination_addr='******',
        short_message=parts[0],

        data_coding=encoding_flag,
        esm_class=msg_type_flag,
        registered_delivery=True,
    )

Traceback (most recent call last):
  File "main.py", line 77, in <module>
    client.listen()
  File "/home/pythonsmpp/smpplib/client.py", line 343, in listen
    self.read_once(ignore_error_codes, auto_send_enquire_link)
  File "/home/pythonsmpp/smpplib/client.py", line 315, in read_once
    self._message_received(pdu)
  File "/home/pythonsmpp/smpplib/client.py", line 244, in _message_received
    status = self.message_received_handler(pdu=pdu)
  File "main.py", line 31, in deliver_sm
    registered_delivery=True,
  File "/home/pythonsmpp/smpplib/client.py", line 357, in send_message
    self.send_pdu(ssm)
  File "/home/pythonsmpp/smpplib/client.py", line 181, in send_pdu
    generated = p.generate()
  File "/home/pythonsmpp/smpplib/pdu.py", line 136, in generate
    body = self.generate_params()
  File "/home/pythonsmpp/smpplib/command.py", line 126, in generate_params
    value = self._generate_int_tlv(field)
  File "/home/pythonsmpp/smpplib/command.py", line 202, in _generate_int_tlv
    value = struct.pack(">HH" + fmt, field_code, field_length, data)
struct.error: required argument is not an integer
WARNING:smpp.Client.139658711658224:<smpplib.client.Client object at 0x7f04d3e5eef0> was not closed