[Ovmsdev] VW e-Up read/poll via OBD is working

[Michael Balzer]

If only I had my Mii already…

If the OBD port is shielded from the CAN traffic, you need to poll some
device. ECU = Engine Control Unit = device 01.

I would suspect the basic car status info to be available from device 09
(central electrics), but it seems no PIDs have been RE'd from there yet.
So maybe you need to derive the info from some other mode/status register.

It's bad needing to continuosly poll to get the live status data. Is
possibly another, unfiltered CAN bus available at the OBD port?

Regards,
Michael


Am 30.07.20 um 16:43 schrieb Soko:
>
> Ahhh OK, I've found OvmsVehicle::virtual void TickerXXX(uint32_t ticker);
> Got it! This was exactly my issue as I didn't know about any function
> which gets called regularly so I could check something like this...
> It's not an ideal situation though: I just can slow down the poll
> after my fail-counter gets too high as I need to check when the car
> gets powered again. So all I can do is polling, lets say every 60 secs
> when the car is off, and increase it once its on. But there is now way
> around this 60-sec polling if the only thing I can do is poll :(
>
> Afaik there is only the sharkcow's list below, reverse engineered by
> him from ODBeleven.
>
> (dev)marxx exlpained to me: There is a gateway between the CAN-Buses
> and the OBD Connector in all VW-AG vehicles which only replies to
> polls and also acts as security gateway if you want to write to the buses.
>
> So I think I cannot really do a can log or use re tool as the OBD
> interface stays quiet if I'm not polling it...
>
> And as there is no other vehicle from VW,Seat,Skoda,Audi,etc. in OVMS.
> So I have no cheat-sheet :(
>
> Anyhow... I would need to poll one ECU (is this the correct therm?)
> which doesn't shuts down... or maybe the issue is the OBD-gateway
> shutting down.
>
> What do you think?
>
> Soko
>
> On 30.07.2020 16:17, Michael Balzer wrote:
>> Soko,
>>
>> nice progress :-)
>>
>> If you can't detect vehicle state by listening to regular status CAN
>> frames, you can check the time since the last poll reply in the per
>> second ticker.
>>
>> As poll replies normally come in fast, you should be able to detect a
>> switch-off by a small timeout, say 3 seconds… probably need to add a
>> counter, as a single poll may get lost / ignored.
>>
>> CAN tx errors can be caused by other issues as well, so should
>> generally not be interpreted that way.
>>
>> But… are you sure there are no status frames on the bus? Have you
>> done a can log or tried the re tool?
>>
>> Regards,
>> Michael
>>
>>
>> Am 30.07.20 um 14:43 schrieb Soko:
>>> Hi guys,
>>>
>>> Want to report success on connecting and reading my VW e-Up via OBD
>>> cable using the Poller. As you can see in the screenshot of the log
>>> attached I get an IncomingPollReply(..) call and an SoC value of
>>> 33.333%
>>>
>>> Once I turn of the ignition and lock the car though I don't get any
>>> replies no more (line D 793813) and then I get can1 errors... I'm
>>> polling with 10 seconds intervall.
>>>
>>> I know that this is as it should be... but my issue is: I don't have
>>> any way to know if the ignition is on, the key is in, the car is
>>> running, the car is charging as the PIDs are not known for such
>>> values (afaik by the lists of sharkcow
>>> https://www.goingelectric.de/wiki/Liste-der-OBD2-Codes/).
>>>
>>> So what would be the best approach to change the different polling
>>> states? Can I somehow get called (in my vehicle-class) if an
>>> can-error is thrown? Then I would increase the poll frequency.
>>>
>>> Any suggestions?
>>>
>>> thanks
>>>
>>> Soko
>>>
>>>
>>> _______________________________________________
>>> OvmsDev mailing list
>>> OvmsDev at lists.openvehicles.com
>>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>
>> -- 
>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>>
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>
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-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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