====== CAN Interfaces ======

USB CAN adapters can show as follows on Linux.

===== Serial Line CAN =====

A serial port appears. slcand can talk to it.

===== SocketCAN =====

A can network device appears. e.g. can0, shown by ifconfig.

Set bitrate for NMEA2000 and bring up CAN interface:

''ip link set can0 up type can bitrate 250000''

It seems SignalK doesn't do this itself.

===== Wireshark =====

Can open SocketCAN interfaces, like ''can0''. Select ''Analyze -> Decode As'', and in the last column of the table you can click to set it to ''J1939''. This will decode as far as giving you PGNs. I didn't find an NMEA2000 decoder, but this at least tells you data is flowing.

[[https://www.kernel.org/doc/html/v5.11/networking/can.html]]

===== Hardware =====

==== CANable ====

CANable is a USB - CAN interface using an STM32F072. CANable firmware does slcan. The same device can be flashed with candleLight firmware which does Linux native / SocketCAN. I bought a device from Aliexpress which came with candleLight.

[[https://www.aliexpress.com/item/1005006032351087.html]]
==== Waveshare Pico CAN ====

[[waveshare_pico_can|Waveshare Pico CAN]]