Request data from another CAN bus via the CAN gateway

Hello everyone,

I have a question. I'm having trouble with the infotainment CAN (directly connected to the RNS-E) in my A3. Is there a way to request data from the powertrain CAN via the CAN gateway? For example, could I transfer data like the water temperature or something else from the powertrain CAN to the infotainment CAN through the CAN gateway? Therefore, it would be necessary to establish communication with the CAN gateway.

Does anyone of you know anything about that?

Regards,
Viewer.

Quote:

I have a question. I'm stuck with the infotainment CAN (directly connected to the RNS-E) on my A3. Is there a way to request data from the powertrain CAN via the CAN gateway? So, for example, could I have the water temperature or something else from the powertrain CAN transmitted to the infotainment CAN via the CAN gateway? One would therefore need to be able to establish communication with the CAN gateway.

That's an interesting topic.
In addition to simply mirroring broadcasts from one CAN bus to another (as defined, for example, in the vehicle configuration list within the gateway), the gateway also supports the establishment of communication channels. However, I have no idea to what extent it can handle scenarios that the original designer didn't anticipate. Nevertheless, the system is probably not very flexible – otherwise, why would there be so many different gateway versions (as indicated by the suffix in the part number)? You can probably find more details in the specification for the transport protocol (specifically TP1.6/TP2.0, depending on the year of manufacture) - but how do you access that information without breaking into Bosch's systems...?

Best regards,
Ingo

Hello Ingo.
Is this still relevant? Okay, bitte gib mir den deutschen Text, den du übersetzt haben möchtest.
You can request individual IDs, for example, from the powertrain CAN bus and transfer them to the comfort or infotainment CAN bus in any VW vehicle with its own diagnostic gateway.
It works in all three directions.

If you're interested, I'd be happy to explain the process here.
I did it on my Golf 5 and on a friend's Golf 6 to display the brake messages on the infotainment system.
The gateway then automatically changes the transmission frequency from 10ms to 100ms, which I find very pleasant.

However, this does not apply to diagnostic sessions or to interior IDs between 0x400 and 0x43F.

Regards,

Felix.

Hello Givertech,

Okay, I'd be very interested to know how you can request data about the gateway.

Best regards,
Marcel (',)

reieg99 wrote:

Hello Givertech, Givertech wrote: If you are interested, I would be happy to describe the process here. Felix. That would also interest me. Regards, Andi

[x] for that.


Best regards,
Ingo

Hello.

Okay, I will.

I'm in Regensburg for a meeting on Monday this week, but then I'll be heading back up north.
I won't have access to my car-related items until then.

Just to make sure we're all on the same page:

It's nothing that can be programmed with VCDS or similar software.
Each ID must be requested and the process must be continuous.
I used a timer (ID 0x575) and then poll, meaning I read the desired IDs from the drive's CAN bus every 100 milliseconds.
It is not possible to run a poll more frequently than every 100 milliseconds.
Sometimes I also make mistakes, as the 0x575 signal can sometimes occur with a 95ms interval.

So, if necessary, it might be better to build your own timer that triggers the polling every 105 milliseconds or so.

Sure, here's the translation:

'Anything else?'
IDs that are used in both the destination CAN and the source CAN will not function!
Therefore, it is not possible to request the 0x575 data from the Comfort CAN and transmit it to the Infotainment CAN.
Aside from the fact that it's nonsense, it will be rejected by the gateway.

Felix.

Hi Felix,

Do you mean that requesting CAN messages via the diagnostic gateway also works with Audi vehicles?
I would appreciate some information, and then I'll try it out.

Has anyone figured anything out here? Or perhaps a suggestion of where we could look? For example, which control unit would utilize this feature?