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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"smpplib.exceptions.UnknownCommandError: Unknown SMPP command code \"0x2001\"","articleBody":"Hi. I use python 3.6 and I get this error when sending a delivery report from SMSC.\r\n\r\n```\r\nTraceback (most recent call last):\r\n  File \"/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/client.py\", line 401, in listen\r\n  File \"/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/client.py\", line 355, in read_once\r\n  File \"/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/client.py\", line 268, in read_pdu\r\n  File \"/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/smpp.py\", line 41, in parse_pdu\r\n  File \"/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/pdu.py\", line 127, in parse\r\n  File \"/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/command.py\", line 315, in parse_params\r\n  File \"/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/command.py\", line 333, in parse_optional_params\r\n  File \"/usr/local/lib/python3.6/site-packages/smpplib-2.2.1-py3.6.egg/smpplib/command.py\", line 71, in get_optional_name\r\nsmpplib.exceptions.UnknownCommandError: Unknown SMPP command code \"0x2001\"\r\n```\r\n\r\nI also have to respond to this message with the `deliver_sm_resp` status. But how can I do it? Here is my code\r\n\r\n```python\r\ndef received_handler(pdu):\r\n    lambda pdu: sys.stdout.write('--'.format(pdu.short_message))\r\n    pdu_body = pdu.short_message\r\n    pdu_phone = pdu.source_addr\r\n    sms_1 = 'sms %s' % (pdu_body)\r\n    logger.info(sms_1)\r\n    phone_1 = 'phone %s' % (pdu_phone)\r\n    logger.info(phone_1)\r\n\r\ntry:\r\n    client = smpplib.client.Client(host,port)\r\n    client.set_message_sent_handler(\r\n        lambda pdu: sys.stdout.write('sent {} {}\\n'.format(pdu.sequence, pdu.message_id)))\r\n    client.set_message_received_handler(received_handler)\r\n    client.connect()\r\n    client.bind_transceiver(system_id=sys_id, password=pwd)\r\n\r\n    client.listen()\r\nexcept UnknownCommandError as e:\r\n    logger.error('UnknownCommandError DELIVER SMS')\r\n    deliver = smpplib.smpp.make_pdu('deliver_sm_resp', client=client)\r\n    client.send_pdu(deliver)\r\n    logger.info(\"SEND deliver_sm_resp\")\r\nexcept Exception as e:\r\n    client.listen()\r\n```","author":{"url":"https://github.com/AnnaLupanova","@type":"Person","name":"AnnaLupanova"},"datePublished":"2022-02-16T05:45:50.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/190/python-smpplib/issues/190"}