On 24 Feb 2018, at 10:23 PM, Mark Webb-Johnson <mark@webb-johnson.net> wrote:

I forgot about vehicles. Tesla Roadster is the same.

I’ll write an ovms_time component now. Then, we can all submit time to it appropriately.

class OvmsTime

  {

  public:

    OvmsTime();

    ~OvmsTime();

  public:

    void Set(char* provider, int stratum, bool trusted, time_t time);

  };

extern OvmsTime MyTime;

Just follow the NTP stratum approach (distance from a zero-delay device). Trusted is a separate indication that just sets stratum level to 16. The provider is simply the logging TAG.

Internal implementation is like NTP. We track the last times from all providers, and pick the one with the lowest stratum that has reported within a reasonable time.

We can add the boot-time save/restore later (once Michael has done that code for safe boot, etc).

Regards, Mark.

On 24 Feb 2018, at 9:19 PM, Geir Øyvind Vælidalo <geir@validalo.net> wrote:

Sounds like a plan. I can get time from the car too, but the resolution is several seconds, so I think we need to have some sort of priority here. Maybe SNTP first, then GPS, cellular and finally “car”?

Geir

Sendt fra min iPhone

24. feb. 2018 kl. 04:36 skrev Mark Webb-Johnson <mark@webb-johnson.net>:

I don’t think so.

There are various sources for date/time. GPS. Cellular. SNTP. Need to ensure that they are not all fighting.

Another module to do this? Have components tell it their opinion of the time, then it centrally decides and updates system clock if necessary

Also store last clock in RTC ram so during a crash/reboot it can recover the last know time?

Regards, Mark

On 24 Feb 2018, at 9:44 AM, Stephen Casner <casner@acm.org> wrote:

Does the sytem date get set anywhere (presumably from GPS)?

This question occurred to me as I'm working on a side project using
the DEVKIT-C module which won't have access to GPS so I added the code
to set the data using SNTP.

                                                     -- Steve
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