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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"SLCAN only receives a few messages and then it hangs?","articleBody":"### Describe the bug\r\n\u003c!-- A clear and concise description of what the bug is. --\u003e\r\nCurrently I am using a SLCAN adapter to receive and transmit some CAN messages. \r\nThe problem I encounter is that there are only a handful(mostly only 3) of messages printed to the console. While the SLCAN adapter works fine when using it in a serial terminal. \r\n\r\n\r\n\r\nConsole output of receive_all.py example in console:\r\n```Python\r\nTimestamp: 1678957835.071922    ID: 0bb00c02    X Rx                DL:  4    2f 0a 00 00\r\nTimestamp: 1678957835.072918    ID: 0bb01c02    X Rx                DL:  4    32 0a 00 00\r\nTimestamp: 1678957835.073915    ID: 0bb01c02    X Rx                DL:  4    c2 0c 00 00\r\n```\r\nAnd that's it. It will hang..\r\n\r\n### To Reproduce\r\n\u003c!-- Steps to reproduce the behavior. Please add longer code examples below. --\u003e\r\nI used the receive_all.py example with the interface initialized like this:\r\n```Python\r\nwith can.Bus(interface=\"slcan\", channel=\"COM15@115200\",  bitrate=500000, \r\n                 ) as bus:\r\n```\r\n\r\n### Expected behavior\r\n\u003c!-- A clear and concise description of what you expected to happen. --\u003e\r\nI expected a result similar to manual use in a serial terminal\r\n\r\n\r\nManual serial terminal output snippet\r\n```\r\nV\r\nV0101\r\nS6\r\n\r\nO\r\n\r\nT1D20F2F2102\r\nT090781008FFFF0F00FFFF0F00\r\nT0BB01C02403040000\r\nT0140800088C72F70B07118010\r\nT00A00C008AC008C72F7070200\r\nT00A01C008AC008C72F7070200\r\nT00200E2280080000000009F44\r\nT00201E22800C3000000003032\r\nT020382221AC\r\nT020782221AC\r\nT0C201F00680119F48CC4F\r\nT00201F0387BCC5B4387F159DA\r\nT0C201F006810804883B4E\r\nT0C201F006820B8A74E34E\r\nT04201F0068DA4C113604F\r\nT04201F0068BA44C03604F\r\nT04201F00697A46DBB614E\r\nT04201F0069DA42A43B04F\r\nT04201F0069EA4637AC04F\r\nT00201F0287BCD5B43780F56DA\r\nT00201F0587BCC5B43780F56DA\r\nT0CF40000403020000\r\nT08E10000403020000\r\nT00200000403020000\r\nT007E0000403020000\r\nT0C200F006800EE0DFDA4F\r\nT0C200F006810843643A4E\r\nT0C200F006820B8837DB4E\r\nT04200F0068877E3C1B04E\r\nT04200F0068977322CB04E\r\nT04200F0068A77E3C1B04E\r\nT04200F0069474AD1DD64D\r\nT04200F006955F94F91DB0\r\nT04200F006965C50A1084D\r\nT04200F0069777E3C1B04E\r\nT00200F01884BC4443780F56DA\r\nT0000000080503FFFE0FFFFE0F\r\nT0000000080502FFFF0F000000\r\nT1D20F2F2102\r\nT090781008FFFF0F00FFFF0F00\r\nT0907810187BCD5B4387F059DA\r\nT08A01D001AC\r\nT08A01D01128\r\nT1A3C82F220200\r\n\r\n+ Thousands of messages after this\r\n\r\n```\r\n\r\n### Additional context\r\n\r\nOS and version: Windows 10 22H2\r\nPython version: 3.11.2\r\npython-can version: 4.1.0\r\npython-can interface/s (if applicable): slcan (pyserial 3.5)\r\n\r\n\u003c!-- Add any other context about the problem here. --\u003e\r\n\r\n\u003cdetails\u003e\u003csummary\u003eTraceback and logs\u003c/summary\u003e\r\n\u003c!-- Has to be followed by an empty line! --\u003e\r\nNo Traceback available.\r\n\u003c!-- More details such as a minimal script to demonstrate the bug, relevant logs and any tracebacks go here. --\u003e\r\n\r\n\r\n\u003c!-- Code examples can be included: --\u003e\r\nComplete receive_all.py example code:\r\n\r\n```Python\r\n\"\"\"\r\nShows how to receive messages via polling.\r\n\"\"\"\r\n\r\nimport can\r\nfrom can.bus import BusState\r\n\r\n\r\ndef receive_all():\r\n    \"\"\"Receives all messages and prints them to the console until Ctrl+C is pressed.\"\"\"\r\n\r\n    # this uses the default configuration (for example from environment variables, or a\r\n    # config file) see https://python-can.readthedocs.io/en/stable/configuration.html\r\n    with can.Bus(interface=\"slcan\", channel=\"COM15@115200\",  bitrate=500000, \r\n                 ) as bus:\r\n        # set to read-only, only supported on some interfaces\r\n        try:\r\n            bus.state = BusState.PASSIVE\r\n        except NotImplementedError:\r\n            pass\r\n\r\n        try:\r\n            while True:\r\n                msg = bus.recv(1)\r\n                if msg is not None:\r\n                    print(msg)\r\n\r\n        except KeyboardInterrupt:\r\n            pass  # exit normally\r\n\r\n\r\nif __name__ == \"__main__\":\r\n    receive_all()\r\n\r\n```\r\n\u003c/details\u003e\r\n","author":{"url":"https://github.com/d3jong","@type":"Person","name":"d3jong"},"datePublished":"2023-03-16T09:32:09.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/1541/python-can/issues/1541"}