[Ovmsdev] GPS theft alert

[Steve Davies]

Hi,

Thanks for the input - I'll push you a PR probably Monday - tomorrow
Valentine's day and let's not take a chance on "you love that computer more
than me" ;-)

Steve

On Sat, 13 Feb 2021 at 20:41, Michael Balzer <dexter at expeedo.de> wrote:

> Steve,
>
> yes, that may be enough time to trigger an alert, as the modem also will
> need a couple of seconds to get the first fix after a reboot. If that
> happens on the highway, you may well reach the alert threshold.
>
> A better init option:
>
>   if (!StdMetrics.ms_v_env_on->AsBool())
>     StdMetrics.ms_v_env_on->SetValue(false);
>
> That takes advantage of the new persistence of the flag. (Persistence
> cannot currently detect "false" as a defined value on boot, as that's the
> default bool value.)
>
> Furthermore, you can test the flag to see if you should directly set the
> poll state to your driving mode. Btw, the same applies to most status flags
> now, so you can for example also detect if a charge session was active
> before the reboot.
>
> Regards,
> Michael
>
>
> Am 13.02.21 um 19:25 schrieb Steve Davies:
>
> On Sat, 13 Feb 2021 at 12:39, Michael Balzer <dexter at expeedo.de> wrote:
>
>
>> I suggest all vehicle developers check their v.e.on logic before we
>> change this.
>>
>>
> Well the bmwi3 logic is like so:
>
> 1) v_env_on is initialised to false when the module is initialised
> 2) When the OBD-2 bus goes dead for 3 seconds I turn off my polling and
> set v_env_on to false
> 3) Otherwise, v_env_on is set to (pollerstate == POLLSTATE_READY &&
> StdMetrics.ms_v_env_gear->AsInt() != 0) - i.e. OBD alive, car is
> responsive on the OBD, and its in gear.  You can't put it in gear unless
> its "ready".  This was the best I could do since I can't find an OBD2 that
> plainly distinguishes "on" (viz accessory position) from "ready" (let's go).
>
> If the module boots up and the OBD2 is alive there will be a brief
> interval of v.e.on being false and as soon as we see obd2 traffic and see
> the car in gear (that is polled every 4 seconds when the car is READY) then
> v.e.on will change to true.
>
> I suppose that may be enough time for this alarm to go off?
>
> Steve
>
>
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