[Ovmsdev] GPS theft alert

Michael Balzer dexter at expeedo.de
Sun Feb 14 02:40:59 HKT 2021


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())

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.


Am 13.02.21 um 19:25 schrieb Steve Davies:
> On Sat, 13 Feb 2021 at 12:39, Michael Balzer <dexter at expeedo.de 
> <mailto: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
> https://www.telviva.co.za/legal/email-disclaimer 
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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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