[Ovmsdev] e: OVMS Poller module/singleton

[Michael Balzer]

A bus-off condition is potentially more significant than an occasional 
RX overflow.

Bus-off is encountered by the transceiver if it sees too many frame 
errors on the bus. It normally recovers by itself from that condition, 
with the exception of transmitting on a switched off bus. That's for 
example the case on the VW e-Up, where can1 has no process data and only 
connects to the diag gateway, when the gateway switches off, and the 
OVMS probes the car status using a poll, it frequently has to reset the 
bus from this state.

The transceiver would see many false frame errors (potentially causing 
the vehicle issue observed) if the timing is off for the Leaf, so seeing 
actual bus errors logged just before the event would be a strong indication.

But we shouldn't jump to conclusions here, let's first try to determine 
which of the buses actually causes the issue.

Regarding logs, please consider logging to SD card, to gather as many as 
possible.

Also, setting the log level to "warn" will exclude all lower priority 
log entries. Rather set it to "debug" or even "verbose" for "can", 
"esp32can" & "mcp2515". If you only set that high level for the 
components of interest, you probably can keep the general level at 
"warn" or "info". Btw, level "debug" for "events" will log all 
non-ticker events, useful to later identify the vehicle state 
transitions if you don't have any logs from the vehicle / poller.

Regards,
Michael


Am 23.01.25 um 18:50 schrieb Chris Box:
> On the transmit side nearly all our activity is on can1. There have 
> been a huge proportion of failures, but this is the only can1 error I 
> can find in the log.
> 2025-01-23 16:37:06.464 GMT E (31051994) esp32can: can1 stuck bus-off 
> error state (errflags=0x00040c00) detected - resetting bus
>
> It's quite possible there are others from earlier in the day, when I 
> had debug level on. I've now set the level to warn so it should be 
> easy to spot everything significant. I'll update when I have something 
> to report.
>

-- 
Michael Balzer * Am Rahmen 5 * D-58313 Herdecke
Fon 02330 9104094 * Handy 0176 20698926

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