[Ovmsdev] Time variable

[Stephen Casner]

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
> >