Ixxat USB-to-CAN v2 | python-can: Close bus, ACK and send_periodic errors

[AntoineBricard]

Hi,

I'm new with python-can (package version= 4.2.1, running on python3.9.6, under Windows 10) and I wanted to perform a test to send/read CAN message using USB-to-CAN v2 (and SimplyCAN as target). But I faced few issues using python-can:

1. Close bus error:

import can
bus = can.interface.Bus(interface='ixxat', channel=0, bitrate=250000, extended=True)
heartbeat = can.Message(arbitration_id=0x11487020, is_extended_id=True, data=[0x01])
bus.send(heartbeat)
bus.shutdown()

Above is the code I used to send CAN message. The point is once the code has been performed, it seems to not close properly the CAN bus. Bellow the error I got:

IXXATBus was not properly shut down
Exception ignored in: <function BusABC.__del__ at 0x000001ACF1418CA0>

Is there a way to properly close the CAN bus ? As i can rerun this script even after the error, should I just not taking account this error ?

2. send_periodic : I wanted to send CAN message every seconds using the method "send_periodic" but it raise the bellow exception: AttributeError: 'IXXATBus' object has no attribute '_periodic_tasks'

As in the doc, it's written that for Ixxat devices, the method "send_periodic" is supported, what did I misunderstand for the use of send_periodic method using Ixxat devices ? Bellow the code for the periodic message:

import can
bus = can.interface.Bus(interface='ixxat', channel=1, bitrate=250000, extended=True)
heartbeat = can.Message(arbitration_id=0x11487020, is_extended_id=True, data=[0x01])
bus.send_periodic(heartbeat, period=1)
bus.shutdown()

3. NACK error :

If the target has a problem and couldn't ACK the CAN message, the python-can API print errors logs as bellow:

CAN acknowledgment error
CAN message flags bAddFlags/bFlags2 0x00 bflags 0x05

And even once the target is reconnected this error message still appears. Is there a way to avoid them ?

Thanks in advance for any help,

Best regards, Antoine

[zariiii9003]

Hi, thanks for reporting

1. Try #1606
2. The traceback might be helpful
3. 🤷‍♀️

[AntoineBricard]

Hi zariiii9003,

1. Thanks for the link, using it could avoid the incorrect shutdown issue.

2. Here is the log I got:

  File "C:\Travail\4MOD - Test\Test_USB_to_CAN\test.py", line 8, in <module>
    bus.send_periodic(heartbeat, period=1, duration=10)
  File "c:\Travail\4MOD - Test\Test_USB_to_CAN\.venv\lib\site-packages\can\bus.py", line 245, in send_periodic
    periodic_tasks = self._periodic_tasks
AttributeError: 'IXXATBus' object has no attribute '_periodic_tasks'

But using a SimplyCAN as target, I could see that the bus.send_periodic method is working but it raise the above exception. Is there a way to fix it or should I just use try/except statement in order to skip the Exception ?

Best regards, Antoine

[zariiii9003]

@AntoineBricard Can you test #1628?

[AntoineBricard]

Hi zariiii9003,

Thanks for the info. I will tests when possible but it will not be before a month.

Best regards, Antoine Bricard

De : zariiii9003 @.> Envoyé : jeudi 6 juillet 2023 14:57 À : hardbyte/python-can @.> Cc : Antoine Bricard @.>; Mention @.> Objet : Re: [hardbyte/python-can] Ixxat USB-to-CAN v2 | python-can: Close bus, ACK and send_periodic errors (Issue #1605)

@AntoineBricardhttps://github.com/AntoineBricard Can you test #1628https://github.com/hardbyte/python-can/pull/1628?

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