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

Fri Jul 31 15:50:48 HKT 2020

Soko,

you only had the door open, but not turned on the car? If there are
additional buses, they may be switched off until the car is turned on…

The OBD connector scheme is the general pin assignment, I meant the
specific VW e-Up schematics. But if you don't see any voltages with the
car turned on, that's bad news.

There may still be some command interface for the OBD gateway to enable
live data, but without any info about the gateway, it will be hard to
even find out how to address it.

Regards,
Michael

Am 31.07.20 um 09:06 schrieb Soko:
>
> Hey guys,
>
> If I did nothing wrong I have bad news:
>
> @Michael:
> With OBD port schematics I think you mean this
> https://en.wikipedia.org/wiki/On-board_diagnostics#OBD-II_diagnostic_connector
> Specifically if there are some other pins used than the standard CAN
> pins 6 and 14.
> So I had the drivers door open, no key in ignition and measured the
> voltages of all pins in relation to pin 5 (signal ground). There is no
> voltage on any pin besides 2.5V on 6 and 14, and 12V on 16 of course.
> So there are no hidden CAN buses (or any other signals) afaict.
>
> @Mark:
> Thanks for the hint with the can log. It's way easier than RE Tools
> for just checking if there is any traffic.
> Having said that... there is no traffic whatsoever besides what I am
> polling and the reply. Even when ignition is on I only see the poll
> and the reply on the can log
>
> So it seems devmarxx was right: The gateway shields everything and
> there are even no other hidden signals on the OBD port.
>
> I'm happy to try any other ideas you guys have. Just let me know!
>
> Soko
>
>
> On 31.07.2020 02:11, Mark Webb-Johnson wrote:
>> If you are just looking for traffic on the CAN bus, a simple can log
>> would be the easiest. Assuming you are on USB console, it is:
>>
>>     OVMS# log level verbose canlog-monitor
>>     OVMS# can log start monitor crtd
>>
>>
>> If you are using ssh, you need to add a:
>>
>>     OVMS# log monitor yes
>>
>>
>> To stop the logging:
>>
>>     OVMS# can log stop
>>
>>
>> Documentation here:
>>
>>     https://docs.openvehicles.com/en/latest/crtd/can_logging.html
>>
>>
>> For my work, I personally prefer this arrangement:
>>
>>     OVMS# can log start tcpserver transmit gvret-b :23
>>
>>
>> And then I use SavvyCAN <https://www.savvycan.com/> on a laptop to
>> connect over wifi and work.
>>
>> Regarding the ‘re’ system, it is a work-in-progress, and not
>> currently documented. It is still kind of a mess at the moment
>> (particularly for multiplexed message IDs), as I continue to work on
>> DBC integration. That said, it is basically functional.
>>
>> To start it:
>>
>>     OVMS# re start
>>
>>
>> To stop it:
>>
>>     OVMS# re stop
>>
>>
>> To see discovered IDs:
>>
>>     OVMS# re list
>>
>>
>> It will (by default) listen on all open CAN buses, and show you the
>> discovered ID, message count, interval (in ms), and last message seen.
>>
>> It has some rudimentary ability to monitor active polling protocols
>> with ‘re obdii extended <min> <max>’ (or standard), specifying the
>> range of IDs used by the ECUs.
>>
>> Regards, Mark
>>
>>> On 30 Jul 2020, at 11:56 PM, Soko <ovms at soko.cc
>>> <mailto:ovms at soko.cc>> wrote:
>>>
>>> @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
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> 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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>>>>> OvmsDev at lists.openvehicles.com
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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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-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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