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hartkopp / can-isotp

Linux Kernel Module for ISO 15765-2:2016 CAN transport protocol PLEASE NOTE: This module is part of the mainline Linux kernel since version 5.10
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read: Network is down #64

Closed pompushko closed 4 months ago

pompushko commented 4 months ago

Hello

I'm using @pylessard udsoncan python library and have some strange workaround after read_data_by_identifier and not big answer. Also, I tried to compile my code in to binary file with Cython or Nuitka, and get same issue.

Here is part of code, after which I got that error during candump:

response_F190 = client.read_data_by_identifier(0xF190)
response_F1A0 = client.read_data_by_identifier(0xF1A0)

Here is candump output during executing this request

  can0  18DA20F1   [3]  02 10 03
  can0  18DAF120   [7]  06 50 03 00 32 01 F4
  can0  18DA20F1   [4]  03 22 F1 90
  can0  18DAF120   [8]  10 14 62 F1 90 5A 41 52
  can0  18DA20F1   [3]  30 00 00
  can0  18DAF120   [8]  21 46 41 45 41 00 00 00
  can0  18DAF120   [8]  22 37 35 36 37 00 00 00
  can0  18DA20F1   [4]  03 22 F1 A0
  can0  18DAF120   [8]  10 43 62 F1 A0 35 30 35
  can0  18DA20F1   [3]  30 00 00
  can0  18DAF120   [8]  21 33 34 30 35 34 20 20
  can0  18DAF120   [8]  22 20 5A 41 52 46 41 45
  can0  18DAF120   [8]  23 41 56 36 4A 00 35 36
  can0  18DAF120   [8]  24 37 00 00 00 00 00 00
  can0  18DAF120   [8]  25 4D 00 30 00 20 20 20
  can0  18DAF120   [8]  26 20 01 30 30 5F 30 00
  can0  18DAF120   [8]  27 5F 30 35 5F 30 00 00
  can0  18DAF120   [8]  28 01 20 20 20 20 20 20
  can0  18DAF120   [6]  29 00 52 50 00 00
read: Network is down

Some time ago it works good. But now it start again 🗡️ 

can@canbus:~ $ uname -a
Linux canbus6.1.0-rpi8-rpi-v7 #1 SMP Raspbian 1:6.1.73-1+rpt1 (2024-01-25) armv7l GNU/Linux
can@canbus:~ $ cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 12 (bookworm)"
NAME="Raspbian GNU/Linux"
VERSION_ID="12"
VERSION="12 (bookworm)"
VERSION_CODENAME=bookworm

No errors at all during script executing. Only after some time I get Timeout error...

Thank you!

hartkopp commented 4 months ago

Hi @pompushko the isotp implementation in the Linux kernel is not able to shut down CAN interfaces. Is it possible that your application or the script starting your application sets the CAN interface parameters - and later shuts down the interface?

Can you post the output of ip -det link show can0 before and after the described read: Network is down issue?

pompushko commented 4 months ago

Seems like something wrong with my CAN transceiver....