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I am trying to figure out how to use a SocketCAN connection in Java.

As stated in the SocketCAN doc, SocketCAN is designed very similar to TCP and UDP Sockets. It also provides a network interface for each connected CAN bus. These are also listed for example by ifconfig:

can0: flags=193<UP,RUNNING,NOARP>  mtu 16
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 1000  (UNSPEC)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

But the can0 interface is not listed by NetworkInterface.networkInterfaces() in Java for example. I guess, because it's not a TCP/UDP interface with an IP. CAN is a different network, without addresses.

I would like give it a try by using the Unix Domain Socket support in Java. But I couldn't find out the file path of the CAN interface to build a UnixDomainSocketAddress.

I know there are tools that route the SocketCAN to a network connection, like socketcand. And also I found libs that make SocketCAN usage possible via JNI or JNA. But I would like to give it a try without extra JNI/JNA implementations and extra tools.

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  • Have you found any more information on this? I'm going to be trying something similar soon. Commented Jun 25, 2023 at 16:56
  • No, sorry I didn't find an answer yet. But not an high priority for me. So didn't invest more time yet. Commented Jul 4, 2023 at 6:53
  • Still no luck? I need to do the same thing and have been doing a LOT of searching... Commented Jan 1, 2024 at 20:26
  • No, sorry. I did not investigate anymore. Commented Apr 30 at 14:31
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