[Ovmsdev] OVMS Poller module/singleton

[Chris Box]

Yes, I can confirm I've had one experience of the Leaf switching to 
Neutral while driving, with a yellow warning symbol on the dash. It 
refused to reselect Drive until I had switched the car off and back on. 
Derek wasn't so lucky and he need to clear fault codes before the car 
would work.

On returning home, I found OVMS was not accessible over a network. I 
didn't try a USB cable. Unplugging and reinserting the OBD cable caused 
OVMS to rejoin Wi-Fi. However the SD logs showed nothing from the time 
of the event. CAN writes are enabled, so it can perform SOC limiting.

My car has been using this firmware since 21st November, based on the 
git master of that day. As a relatively new user of OVMS (only since 
October) I don't have much experience of older firmware.

Perhaps a safeguard should be implemented before releasing a new stable 
firmware that will be automatically downloaded by Leaf owners. But I 
don't have the expertise to know what that safeguard should be. Derek's 
suggestion of 'only CAN write when parked' appears to be a good idea.

Chris

On 2025-01-15 18:18, Derek Caudwell via OvmsDev wrote:

> Since the following email I have high confidence the issue on the Leaf 
> is related/caused by the poller as there has been no further occurrence 
> and Chris has also experienced the car going to neutral on the new 
> poller firmware.
> 
> ....
> I haven't ruled out it being a fault with my car yet. Shortly after it 
> faulted the car was run into so has been off the road for sometime, my 
> first step was to replace 12V battery. The ovms unit is now unplugged 
> and if it does not fault over the next month while driving I'll be 
> reasonably confident it's ovms related.
> 
> Not sure which firmware version the poller updates were included in but 
> it was only after upgrading to it that the errors occurred (which could 
> be coincidental however it has faulted twice more both on version 
> 3.3.004-141-gf729d82c). For periods where I reverted to 3.3.003 it was 
> fine.
> 
> It might be useful to have an extra option on the enable can write to 
> only enable it when the car is parked/charging.
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