Traceback (most recent call last):
 File "/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/client.py", line 401, in listen
 File "/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/client.py", line 355, in read_once
 File "/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/client.py", line 268, in read_pdu
 File "/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/smpp.py", line 41, in parse_pdu
 File "/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/pdu.py", line 127, in parse
 File "/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/command.py", line 315, in parse_params
 File "/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/command.py", line 333, in parse_optional_params
 File "/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/command.py", line 71, in get_optional_name
smpplib.exceptions.UnknownCommandError: Unknown SMPP command code "0x2001"

def received_handler(pdu):
 lambda pdu: sys.stdout.write('--'.format(pdu.short_message))
 pdu_body = pdu.short_message
 pdu_phone = pdu.source_addr
 sms_1 = 'sms %s' % (pdu_body)
 logger.info(sms_1)
 phone_1 = 'phone %s' % (pdu_phone)
 logger.info(phone_1)
try:
 client = smpplib.client.Client(host,port)
 client.set_message_sent_handler(
 lambda pdu: sys.stdout.write('sent {} {}\n'.format(pdu.sequence, pdu.message_id)))
 client.set_message_received_handler(received_handler)
 client.connect()
 client.bind_transceiver(system_id=sys_id, password=pwd)
 client.listen()
except UnknownCommandError as e:
 logger.error('UnknownCommandError DELIVER SMS')
 deliver = smpplib.smpp.make_pdu('deliver_sm_resp', client=client)
 client.send_pdu(deliver)
 logger.info("SEND deliver_sm_resp")
except Exception as e:
 client.listen()