[Ovmsdev] Time variable

[Mark Webb-Johnson]

Damn:

https://www.cika.com/soporte/Information/GSMmodules/GPS-week-rollover_Simcom.pdf <https://www.cika.com/soporte/Information/GSMmodules/GPS-week-rollover_Simcom.pdf>

I think we can do a fix in the SIMCOM module that if the date <2019-11-03 then offset it somehow? Any ideas?

Regards, Mark.

> On 7 Nov 2019, at 1:09 PM, Stephen Casner <casner at acm.org> wrote:
> 
> This page mentions the problem:
> 
> https://techship.com/news/gps-week-roll-over-issue-during-epoch-restart/
> 
> Quoting there:
> 
>    For the Qualcomm MDM9x15 series (4G/LTE Cat 3) and MDM6200
>    (3G/HSPA+) series chipsets there is a offset used, so the GPS week
>    roll over will occur 1054+1023 weeks since launch of the GPS, and
>    more precisely in beginning of November 2019 (UTC 23:59:42
>    November 2, 2019)
> 
>    [snip]
> 
>    3G/HSPA+ modules based on Qualcomm MDM6200 series chipsets:
>    Huawei EM820W / MU609 series
>    Telit DE910 series
>    Simcom SIM5320 series
> 
> This sounds like the hardware/firmware won't be fixed.  Perhaps the
> solution for OVMS is just to put an offset as a workaroud.  That will
> work for the next 1024 weeks.
> 
>                                                        -- Steve
> 
> On Wed, 6 Nov 2019, Stephen Casner wrote:
> 
>> Sorry, I did not read carefully.  The item you mentioned is just an
>> antenna.  The GPS implementation is in the modem module, correct?
>> That's where the correction is needed.
>> 
>>                                                        -- Steve
>> 
>> On Thu, 7 Nov 2019, Tamás Kovács wrote:
>> 
>>> I use a universal gps connected to ovms, not the car own gps. (
>>> https://www.fasttech.com/products/1020200)
>>> 
>>> Stephen Casner <casner at acm.org> ezt írta (időpont: 2019. nov. 7., Cs, 0:42):
>>> 
>>>> Tamás,
>>>> 
>>>> This looks like the GPS sensor did not handle the rollover of the
>>>> 10-bit week-number field in April, 2019.  So the timestamps are off by
>>>> 1024 * 7 * 24 * 60 * 60 seconds.  Here is the US government alert about
>>>> this problem:
>>>> 
>>>> 
>>>> https://www.us-cert.gov/sites/default/files/documents/Memorandum_on_GPS_2019.pdf
>>>> 
>>>> This problem was recently discovered for the Garmin GPS 18x LVC
>>>> sensors in the Tesla Roadster 2.5 (but not in the earlier 1.5 version
>>>> like I have, which has the older GPS 18 LVC sensor):
>>>> 
>>>> 
>>>> https://teslamotorsclub.com/tmc/threads/caution-annual-service-car-power-down-gps-issue.163328/
>>>> 
>>>> There is a firmware update to fix this for the GPS 18x LVC.  Perhaps
>>>> there is one for the GPS sensor in the Mitsubishi as well.
>>>> 
>>>>                                                        -- Steve
>>>> 
>>>> On Wed, 6 Nov 2019, Tamás Kovács wrote:
>>>> 
>>>>> I have a problem with utc time, the time is correct but the date is not
>>>>> valid. I use 3.2.005-99-g88cfeef9 version with modification of Mitsubishi
>>>>> i-MiEV.
>>>>> 
>>>>> OVMS# me li utc
>>>>> m.time.utc                               953756768Sec
>>>>> I (900675) housekeeping: 2000-03-22 21:27:06 CET (RAM: 8b=82812-86452
>>>> 32b=27308)
>>>>> I (981115) webserver: HTTP POST /api/execute
>>>>> I (981115) webcommand: HttpCommandStream[0x3fa32958]: 1984428 bytes
>>>>> free, executing: time
>>>>> OVMS# time
>>>>> Time Zone:  CET-1CEST,M3.5.0,M10.5.0/3
>>>>> UTC Time:   2000-03-22 20:28:27 UTC
>>>>> Local Time: 2000-03-22 21:28:27 CET
>>>>> Provider:   gsm-nmea
>>>>> 
>>>>> PROVIDER             STRATUM  UPDATE TIME
>>>>> *gsm-nmea                  2       0 Wed Mar 22 20:28:27 2000
>>>>> 
>>>>> 
>>>>> --
>>>>> Üdvözlettel:
>>>>> Kovács Tamás_______________________________________________
>>>> OvmsDev mailing list
>>>> OvmsDev at lists.openvehicles.com
>>>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>>> 
>>> 
>>> 
>>> --
>>> Üdvözlettel:
>>> Kovács Tamás
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