[Ovmsdev] GPS theft alert

[sharkcow]

OK, in my case OVMS lost the GPS fix for one log entry, then apparently
my car took a 400m dive! Strange theft approach... ;-)

Took about 10mins. for GPS to be back in the correct position.

So, would we want to implement a workaround? Maybe wait with the alert
after fix is lost? But then again, if the car really is towed, I'd like
to know asap...

Thanks,

sharkcow


Am 12.02.21 um 10:35 schrieb Michael Balzer:
> Please check your "L" log at the time of the alert: what did your GPS
> data look like just before the alert?
>
> There's the option of raising the alert threshold. It's 500 meters by
> default (config vehicle flatbed.alarmdistance). But we should first
> determine the cause of the false alerts.
>
> Regards,
> Michael
>
>
> Am 12.02.21 um 10:28 schrieb sharkcow:
>> I got the theft alert again last night, the car had been standing for
>> several hours... so at least in my case I would think the alert trigger
>> is too sensitive compared to the resolution/accuracy of the GPS
>> measurement.
>>
>> Best regards,
>>
>> sharkcow
>>
>>
>> Am 09.02.21 um 18:40 schrieb Michael Balzer:
>>> I found the reason for the false theft/flatbed alert in my case by
>>> checking my telemetry archive: the car lost GPS on the road. Coordinates
>>> were stale when I parked the car. The stale coordinates were taken as
>>> the initial park coordinates, causing an alert when the GPS receiver
>>> delivered the next valid data (the actual park position).
>>>
>>> So the bad antenna placement actually was the cause in my case, but we
>>> can solve that in software.
>>>
>>> I've just pushed a fix (untested) for this, consisting of a) making the
>>> location module aware of parking coordinate staleness and b) lowering
>>> the staleness thresholds for the GPS metrics to 10 seconds.
>>>
>>> Please verify.
>>>
>>> Regards,
>>> Michael
>>>
>>>
>>> Am 09.02.21 um 10:29 schrieb Michael Balzer:
>>>> I had the alert once with my Mii, also shortly after parking. With the
>>>> module being mounted with the GPS antenna placed under the hood, I
>>>> assumed that to be the cause.
>>>>
>>>> I doubt it, but I'll check if any of our changes could have had an
>>>> impact on the GPS movement detection.
>>>>
>>>> Regarding open changes to be included in 3.2.016: sharkcow is
>>>> currently working on finishing the UpMiiGo TPMS feature, it's already
>>>> been tested so we'll wait for that.
>>>>
>>>> Regards,
>>>> Michael
>>>>
>>>>
>>>> Am 09.02.21 um 09:57 schrieb sharkcow:
>>>>> Hi all,
>>>>>
>>>>> > Twice in the last few weeks I've gotten the "possible theft/flatbed"
>>>>> alert just as I was backing out of the garage. I have never received
>>>>> that alert before. I hadn't posted anything yet because I was
>>>>> waiting to
>>>>> drive the other car and see if has the same problem.
>>>>>
>>>>> I get this too every once in a while with my e-Up. Mostly shortly
>>>>> after
>>>>> parking, I think (and tragically, the one time I'd have needed it
>>>>> because I actually _did_ get towed, I had crashed OVMS into a boot
>>>>> loop
>>>>> just before :-/).
>>>>>
>>>>> sharkcow
>>>>
>>>>
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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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