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

Thu Jul 30 23:56:02 HKT 2020

@devmarxx: Is there any doc/guide on how to use this RE Tools?

@Michael: Yeah, I know. You would have done my 1-day work in 5 mins. I 
know C++ but I don't know the OVMS framework. But its like with any 
project: The issue is not the language, its the framework.

Until you have yours you have to settle with me unfortunately ;)

My cousin has a working VCDS HEX interface and I have an y-adapter so I 
can listen with an ELM327 adapter to the commands VCDS is sending. Maybe 
I can find any car status there. Device 09 is a good hint.

But as you said: I have still have to poll this, even if I find a status.

I can't say (of course) if there's another CAN bus @ OBD port. All this 
CAN/OBD/Bus stuff is completely new to me.. ModBus RTU/TCP, MBus etc. I 
would know ;)

So if you can point me in any direction what to try - or what you would 
do - I happy to dig into it.

Soko

PS: Any idea when you'll get your Mii?

On 30.07.2020 17:14, Michael Balzer wrote:
> 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
>>>>
>>>>
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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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>>
>> _______________________________________________
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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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> OvmsDev at lists.openvehicles.com
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