[Ovmsdev] Polling keeps car awake (VW e-Up at least)

[Michael Balzer]

Soko,

I don't see any obvious mistakes on a first check.

Please do the tests again with CAN monitoring, so we can see what's
actually going on on the bus.

An OBD device normally logs into the device sending a UDS diag session
command (0x10), then keeps that session alive by sending tester present
(0x3E) evers 30-60 seconds. See the UDS documentation I sent you, or for
an overview, see https://de.wikipedia.org/wiki/Unified_Diagnostic_Services

You should be able to get the session type and protocol by logging what
your VCDS does on the bus.

Regards,
Michael


Am 03.08.20 um 06:19 schrieb Soko:
>
> Mornin,
>
> Source is here:
> https://github.com/devmarxx/Open-Vehicle-Monitoring-System-3/tree/master/vehicle/OVMS.V3/components/vehicle_vweup/src
>
> Attached are two logs. I haven't had the can-monitor active
> unfortuantely..
>
> *VWUP_OFF_TICKER_THRESHOLD 5 with 4 trys.log*
> As the name says it polls every 5 seconds in PollState=1 and swaps
> back to PollState=0 after 5*4=20 seconds.
> Until line 35 you see the CAN errors as the vehicle is OFF. Then I
> unlocked the car and in line 38 I get the first reply.
> Around line 90 I locked the car again. It polls, but gets no reply,
> _but not error either_ (?!).
> Line 118 sets the PollState=0 and suddenly a response comes in. So in
> Line 123 I set the PollState=1 again.
> The the game starts again: Polls get send, no reply but no error
> either. After 21 CarOffTickers I switch to PollState=0 and suddenly a
> reply comes in...
>
> *VWUP_OFF_TICKER_THRESHOLD 10 with 4 trys.log
> *Here I unlocked at line 57 and locked around line 100. After that
> polls get send, no reply, _but errors happen_. And the car is finally off.
> Although I've tried the same thing later that day and the car didn't
> even go to sleep with Threshold=30!?!? So the behavior is not 100%
> reproducible (yet)...
>
> @gateway throttling: In VCDS (which - hopefully - does only polling
> too) I have a little number showing me the refresh rates of the
> values. It indicates ~8 refreshes per second. So with 1 second
> shouldn't be any throttling.
>
> @OBD "tester": I have no clue what this is ;) So if the polling
> framework doesn't do it, I don't do it. All I do is in the obd_eup.*
> files.
>
> Soko
>
> On 02.08.2020 20:12, Michael Balzer wrote:
>> Soko,
>>
>> polling may keep the car awake, that's also an issue on the Kia
>> e-Niro IIRC.
>>
>> Changing the PollState can only affect the car indirectly via the
>> changed polls. Maybe you could add your code & a log?
>>
>> Regarding the poll replies stopping, is that also reflected in a CAN
>> log? Maybe the OBD gateway throttles if it sees too many requests?
>> (Hopefully not…)
>>
>> If the gateway does throttling: do you login to the OBD as a "tester"
>> and keep the session active by periodically sending the "tester
>> present" frame?
>>
>> Regards,
>> Michael
>>
>>
>> Am 02.08.20 um 19:30 schrieb Soko:
>>>
>>> Heya again,
>>>
>>> I'm trying to develop a detection for when the car is off/locked but
>>> I'm encountering a weird phenomena:
>>>
>>>   * Car is shut down and locked
>>>   * OVMS connected
>>>   * CAN poll for voltage (only one poll value active) with 30 secs
>>>     fails with error (so far nothing weird)
>>>   * Unlock the car via car-key remote
>>>   * Poll succeeds and I'm switching from PollState=0 to PollState=1
>>>     where I poll every 2 secs
>>>   * Lock the car via car-key remote
>>>   * _After 1 hour the polls still work and the car is active_
>>>
>>> Is something like this known from other vehicles? So basically my
>>> car never shuts down :(
>>>
>>> Another secondary weird thing:
>>> When increasing the time to 5 secs for PollState=1 the polls get no
>>> reply and after 20 secs I swap back to PollState=0.
>>> BUT the second the PollState changes the car replies again...
>>> Even more weirdness: When PollState=1 time is 10 secs and I swap
>>> back to Pollstate=0 after 40 secs the same thing happens!
>>> Immediately I swap to PollState=0 the car replies again.
>>> As if the PollState switching somehow wakes the car up??!
>>>
>>> Any ideas?
>>>
>>> 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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