CAN Bus over TCP/IP

CAN Bus over TCP/IP

[John Whitmore]

Was contemplating something which would allow me to transmit CAN Bus frames
over TCP/IP. Searching throws up a few papers on the subject but wondered if
there's an OpenSource implementation already out there or any kind of spec on
the subject. Thought there might be an RFC on the subject but haven't thrown
up anything.

Re: CAN Bus over TCP/IP

[Yegor Yefremov]

On Sat, Jun 14, 2014 at 3:55 AM, John Whitmore <arigead@gmail.com> wrote:
> Was contemplating something which would allow me to transmit CAN Bus frames
> over TCP/IP. Searching throws up a few papers on the subject but wondered if
> there's an OpenSource implementation already out there or any kind of spec on
> the subject. Thought there might be an RFC on the subject but haven't thrown
> up anything.

Take a look at this project: https://github.com/dschanoeh/socketcand

Another variant were to extend slcanpty to accept TCP connections.

Yegor

Re: CAN Bus over TCP/IP

[Stefan May]

A very simple solution using a messaging broker is this one:

  https://github.com/smay4finger/MQTT2CAN

Beware, it's not real-time capable and was not developed with network
security in mind.

mfg, Stefan.

On Sa, 2014-06-14 at 02:55 +0100, John Whitmore wrote:
> Was contemplating something which would allow me to transmit CAN Bus frames
> over TCP/IP. Searching throws up a few papers on the subject but wondered if
> there's an OpenSource implementation already out there or any kind of spec on
> the subject. Thought there might be an RFC on the subject but haven't thrown
> up anything.
> --
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Re: CAN Bus over TCP/IP

[Andre Naujoks]

On 14.06.2014 03:55, John Whitmore wrote:
> Was contemplating something which would allow me to transmit CAN Bus frames
> over TCP/IP. Searching throws up a few papers on the subject but wondered if
> there's an OpenSource implementation already out there or any kind of spec on
> the subject. Thought there might be an RFC on the subject but haven't thrown
> up anything.
> --
> To unsubscribe from this list: send the line "unsubscribe linux-can" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Hi.

Have a look at slcan and the accompanying tools (slcan_attach, ...) from
can-utils in combination with socat or a simple C-implementation that
just forwards data between a pseudo-tty and a socket. I use that setup
to connect multiple virtual machines via CAN for testing purposes.

The final setup would look like this:

candev <-> ptty <-> socat <-> tcp <-> socat <-> ptty <-> candev

I don't know what kind of performance you need, but it should definitely
be worth a look.

For example:
Machine A:
socat -d -d PTY,link=/tmp/slcan,raw TCP-LISTEN:30000 &
slcan_attach /tmp/slcan
ip link set slcan0 up

Machine B:
socat TCP:<machine-A-IP>:30000 PTY,link=/tmp/slcan
slcan_attach /tmp/slcan
ip link set slcan0 up


should connect those two CAN-Busses over TCP.

Regards
  Andre