Firmware restart not bringing back up the can0 network

General Discussion
1

Basic Information:

Printer Model: trident
MCU / Printerboard: mks skipr
Host / SBC mks skipr with sht36 pro
klippy (1).log (430.6 KB)

Describe your issue:

i’m having trouble getting the can0 network back online after a restart. any guess why it is happening ?

2

i will reply that after typing :

sudo ip link set up can0 type can bitrate 1000000

and after issuing another firmware restart the klipper host was able to reconnect to the boards…

odd, very odd…

3

What do you have setup in your /etc/network/interfaces.d/can0?

4

this :

allow-hotplug can0
 iface can0 can static
        bitrate 1000000
        # up ifconfig $IFACE txqueuelen 128                   # It will not wor>
        up ip link set $IFACE txqueuelen 128
        #up ip link set $IFACE txqueuelen 1024 restart-ms 200 # Bit more aggres>

but i found that after re-installing everything, it was working but after changing the /etc/network/interfaces file to set a static adresse it caused the issue…

auto end1
iface end1 inet static
address 192.168.2.49
netmask 255.255.255.0
gateway 192.168.2.1 # Modify this if needed
dns-nameservers 8.8.8.8 8.8.4.4 # Modify DNS servers if needed

5

Set it up like the official klipper docs
https://www.klipper3d.org/CANBUS.html#host-hardware

Also the note about the txquelen:
https://www.klipper3d.org/CANBUS_Troubleshooting.html#use-an-appropriate-txqueuelen-setting

6

Consider following this excellent guide for setting up CAN: Getting Started | Esoterical’s CANBus Guide

7

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