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socketcan cannot create multiple periodic messages with same arb id #930
Description
When using a socketcan device and sending multiple periodic messages I receive the below error
"ValueError: A periodic Task for Arbitration ID XXXX has already been created." Where XXX is the arbitration ID of the message I am trying to send periodically.
Is it possible to send multiple periodic messages with same ID using socketcan?
I found this issue when running few tests using a systec probe on Linux. On Windows using the systec probe, and the systec option in python-can, I am able to create multiple cyclic messages with the same ID. Running on Linux with the systec probe as a socketcan device the same test fails. I verified with another socket can device as well.
Some context is we will be trying to simulate an ECU on a bus. So its possible that there will be multiple periodic messages coming from the same ID with different data.
Activity
ga-dmorey commentedon Jan 12, 2021
I ran into a similar issue. It looks to be an issue with socketcan itself. The socketcan docs mention this under the Broadcast Manager doc (section 4.2) where it says: "The different RX/TX jobs are distinguished by the unique can_id in each BCM message."
tysonite commentedon Mar 15, 2021
It shall not be an issue anymore since #785 has been merged. The only thing is that this fix probably has not been released as it wasn't backported to Python 2.
felixdivo commentedon Apr 14, 2021
@SiouxerSkate @ga-dmorey Is this now solved?
felixdivo commentedon Apr 16, 2021
I read the referenced PR again. It should indeed be fixed by #785. If not, please comment or open a new issue. Thanks for reporting!