René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Message received handler called without actually receiving the SMS","articleBody":"The handler gets called while the SMS is not received.\r\nI tested it by turning flight mode on and thus disconnecting from cell services.\r\n\r\n```python\r\nclient.set_message_received_handler(lambda pdu: handle_deliver_sm(pdu))\r\n```\r\n\r\n`handle_deliver_sm` gets called after some time which appears to be random.\r\n\r\nI printed some fields of the `DeliverSM` object in hopes to see a flag or sth similar...\r\nHowever, I could not find anything that seemed to be different from actually receiving the SMS\r\n\r\n```python\r\nclient.listen(auto_send_enquire_link=False)\r\n...\r\nclient.send_message(\r\n            source_addr_ton=smpplib.consts.SMPP_TON_ALNUM,\r\n            source_addr_npi=smpplib.consts.SMPP_NPI_UNK,\r\n            source_addr=config.SOURCE_NAME,\r\n            dest_addr_ton=smpplib.consts.SMPP_TON_INTL,\r\n            dest_addr_npi=smpplib.consts.SMPP_NPI_ISDN,\r\n            destination_addr=phone_number,\r\n            short_message=part,\r\n            data_coding=encoding_flag,\r\n            esm_class=msg_type_flag,\r\n            registered_delivery=True,\r\n)\r\n```\r\n\r\nAm I missing sth?","author":{"url":"https://github.com/micartey","@type":"Person","name":"micartey"},"datePublished":"2023-12-12T12:42:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/241/python-smpplib/issues/241"}