[Ovmsdev] GPS location glitch (flatbed theft false alert)

[Michael Balzer]

Heiko,

that log excerpt was sufficient to now be sure we cannot do anything 
about these false alerts. You can only raise your alert threshold.

This happened: your GPS location suddenly went off by 200m, stayed there 
for a minute, then jumped to a position off by 900m, stayed at that 
point for another minute, then went back to the original park position.

…
2021-02-21 15:55:09.668 CET I (288729388) ovms-server-v2: Send MP-0 
L48.987923,12.216290,0,338.2,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,8,0.9,0.0
2021-02-21 15:55:30.658 CET I (288750378) ovms-server-v2: Send MP-0 
L48.987923,12.216290,0,338.4,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,8,0.9,0.0
2021-02-21 15:56:12.668 CET I (288792388) ovms-server-v2: Send MP-0 
L48.987923,12.216291,0,338.5,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,8,0.9,0.0
2021-02-21 15:56:33.668 CET I (288813388) ovms-server-v2: Send MP-0 
L48.987923,12.216291,0,338.6,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,8,0.9,0.0
2021-02-21 15:56:54.668 CET I (288834378) ovms-server-v2: Send MP-0 
L48.987923,12.216292,0,338.6,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,8,0.9,0.0
2021-02-21 15:57:15.658 CET I (288855378) ovms-server-v2: Send MP-0 
L48.987923,12.216292,0,338.7,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,8,0.9,0.0
2021-02-21 15:57:57.678 CET I (288897388) ovms-server-v2: Send MP-0 
L48.987923,12.216292,0,338.7,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,8,0.9,0.0
2021-02-21 15:58:52.688 CET I (288952398) ovms-server-v2: Send MP-0 
L*48.987923,12.216293*,0,338.8,0,0,0.0,30,0,0.000,0.951,0.053,0,0,AN,8,0.9,0.0

2021-02-21 15:59:09.668 CET I (288969378) ovms-server-v2: Send MP-0 
L*48.986771,12.213362*,310.5,72,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,6,1.4,0.0
*→ first jump to 200m distance*
2021-02-21 15:59:13.678 CET I (288973388) ovms-server-v2: Send MP-0 
L48.986782,12.213336,310.5,68,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,4,1.8,0.7
2021-02-21 15:59:34.668 CET I (288994388) ovms-server-v2: Send MP-0 
L48.986874,12.213301,0,62.4,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,4,1.8,0.0
2021-02-21 15:59:55.668 CET I (289015388) ovms-server-v2: Send MP-0 
L48.986874,12.213300,0,63.8,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,5,1.6,0.0

2021-02-21 16:00:24.378 CET W (289044098) location: CheckTheft: 
flatbed.moved @*48.994774,12.209670* gpsmode=AN satcount=5 hdop=1.9 
gpsspeed=0.0
*→ second jump to 906m distance → alert*
2021-02-21 16:00:24.658 CET I (289044378) ovms-server-v2: Send MP-0 
L48.994774,12.209670,316.9,1925.6,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,5,1.9,0.0
2021-02-21 16:00:37.668 CET I (289057388) ovms-server-v2: Send MP-0 
L48.994671,12.209748,316.9,1908.4,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,5,1.9,0.0
2021-02-21 16:00:58.668 CET I (289078388) ovms-server-v2: Send MP-0 
L48.994465,12.209938,124.1,1876.5,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,6,1.3,1.1
2021-02-21 16:01:19.668 CET I (289099388) ovms-server-v2: Send MP-0 
L48.994236,12.210092,124.1,1831.4,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,6,1.3,0.0

2021-02-21 16:01:43.658 CET I (289123378) ovms-server-v2: Send MP-0 
L*48.987961,12.216274*,124.1,345.1,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AA,9,1.2,0.0
*→ back to park position*
2021-02-21 16:01:53.658 CET I (289133378) ovms-server-v2: Send MP-0 
L48.987968,12.216249,124.1,346.3,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,8,0.9,0.0
2021-02-21 16:02:01.668 CET I (289141388) ovms-server-v2: Send MP-0 
L48.987972,12.216249,124.1,346.4,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,8,0.9,0.0
2021-02-21 16:02:22.668 CET I (289162388) ovms-server-v2: Send MP-0 
L48.987972,12.216251,124.1,346.7,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,8,0.9,0.0
2021-02-21 16:02:43.668 CET I (289183388) ovms-server-v2: Send MP-0 
L48.987972,12.216255,124.1,347,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,8,0.9,0.0
2021-02-21 16:03:04.668 CET I (289204388) ovms-server-v2: Send MP-0 
L48.987972,12.216256,124.1,347,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,8,0.9,0.0
2021-02-21 16:03:25.668 CET I (289225388) ovms-server-v2: Send MP-0 
L48.987972,12.216257,124.1,347,1,1,0.0,30,0,0.000,0.951,0.053,0,0,AN,8,0.9,0.0
…


Satellite count went down during that episode from 8 to 4, but the fix 
wasn't lost and the HDOP was still excellent. 4 satellites normally are 
sufficient for a good position, also when the alert occured, a fifth 
satellite already had been locked.

IOW, that looked exactly like an actual flatbed theft would have looked.

The only thing you can do is raise your theft alert threshold to, say, 
1000m. Or higher if these GPS jumps go beyond 1000m.

It seems this is a glitch in the SIM5360 GPS receiver.

Regards,
Michael


Am 27.02.21 um 19:57 schrieb sharkcow:
> Ah, thanks for the tip (I had that on in the beginning but could'nt make
> much of the logs so I'd turned it off meanwhile :-/)
>
> Here's a bit more log info.
>
>
> Am 27.02.21 um 17:57 schrieb Michael Balzer:
>> Heiko,
>>
>> off-topic, but that's why I provide the email export feature on my
>> server. Simply tick the checkbox and set your desired export time, and
>> the server will send you a full data export zipped once per day.
>>
>> That way you can always go gack in time to any point.
>>
>> Your log excerpt was a bit too narrowed down, please show a few more
>> messages with the "location" tag around the alert.
>>
>> Regards,
>> Michael
>>
>>
>> Am 27.02.21 um 17:41 schrieb sharkcow:
>>> I got one false theft alert a few days back, but it seems the server
>>> logs aren't saved that long... :(
>>>
>>> relevant lines of console log attached.
>>>
>>> sharkcow
>>>
>>>
>>> Am 27.02.21 um 16:47 schrieb Michael Balzer:
>>>> As the other thread got off-topic: I'd still like to get forward
>>>> regarding release 3.2.016.
>>>>
>>>> We identified three open issues:
>>>>
>>>>  1. VW e-Up sometimes stays awake for 4-5 hours.
>>>>  2. Wifi AP connection is unstable with some devices.
>>>>  3. More frequent location flatbed theft false alerts.
>>>>
>>>> My current status on these is:
>>>>
>>>>  1. …is probably not a bug on the OVMS but rather a real behaviour of
>>>>     the e-Up performing an extended 12V trickle charge.
>>>>  2. …has only been reported by Steve Davies and seems (?) to have been
>>>>     solved by the default scan timings – Steve?
>>>>  3. …seems to be a Heisenbug, i.e. hasn't had any reports since we 
>>>> added
>>>>     extended logging.
>>>>
>>>> Is my status correct? If so, I think these should no longer stop us 
>>>> from
>>>> releasing 3.2.016.
>>>>
>>>> Regards,
>>>> Michael
>>>>
>>>> -- 
>>>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>>>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>>>>
>>>>
>>>> _______________________________________________
>>>> OvmsDev mailing list
>>>> OvmsDev at lists.openvehicles.com
>>>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>>>
>>>
>>> _______________________________________________
>>> 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
>>
>>
>> _______________________________________________
>> OvmsDev mailing list
>> OvmsDev at lists.openvehicles.com
>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>
>
> _______________________________________________
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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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