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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Missing Data, Questionable Arbitration IDs when using PCBUSB with python-can notifier","articleBody":"Uwe,\n\nI am seeing some unexpected behavior when using your library with python-can.  Your monitor tool has an output like this (which looks correct):\n```\n./pcbusb_recv\nInitialize CAN: 0x0\n  - R ID: 601 LEN:8 DATA:63 00 00 00 63 a5 d0 01\n  - R ID: 602 LEN:8 DATA:63 00 ff ff ff ff ff ff\n  - R ID: 603 LEN:8 DATA:63 00 01 00 00 00 02 00\n```\n  \nWhen I rx these same messages in python the arb ID is way different but the lower bytes are correct:\nmsg.arbitration_id = 27874818787378690 = 0x63080000000602\n\nThe message also only contain an empty byte array for data and has a dlc of 255.\n\nFollowing the message up the call stack in python, it never appears to have the right data so I though I would reach out to you.\n\nNot sure how to debug from here since the library doesn't have sources.  Please help! :)\n\n\n\n","author":{"url":"https://github.com/trey-sygnalauto","@type":"Person","name":"trey-sygnalauto"},"datePublished":"2025-09-30T20:55:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/23/PCBUSB-Library/issues/23"}