[Ovmsdev] Poor wifi performance

Michael Balzer dexter at expeedo.de
Fri Jan 4 21:11:30 HKT 2019


you could have enabled event logging additionally, but there clearly is no event from the wifi driver on the disassociation, or the netmanager would have logged
this as well.

You're probably right in the websocket job queue overflow indicating the loss, but that won't fit as a general canary, as it's only active while at least one
web client is connected.

Another thing you could monitor is the signal quality, or maybe check for a lack of update callbacks? That's CSIRxCallback in esp32wifi.

But that's all working around the underlying wifi blob bug. We first should check if the current IDF blob does a better job.


Am 04.01.19 um 06:15 schrieb Stephen Casner:
> Yesterday I found another instance where I could not ssh to OVMS nor
> ping it.  This time I verified in my router status that the wifi
> association with OVMS was "inactive" (down).  The iPhone app said that
> server-v2 was not hear for 108 minutes.  This time I have a full log
> file covering back to the previous day, which is attached.
> I connected to OVMS with the serial console and the output from the
> serial monitor is appended to the attached log file.  The "wifi stat"
> and "net stat" commands both indicated that the wifi connection was up
> when all the external indications were to the contrary.  Going back
> 108 minutes in the log file corresponds roughly to the first instance
> of "job queue overflow detected".  Perhaps the web server can act as
> the canary in the coal mine?  There is no indication that the wifi
> driver signaled any problem at that time.
> Diagnosing this problem is difficult because the loss of connectivity
> occurs after a day or a few days of operation.  I have not tried the
> current esp-idf yet; I may do that, but I'm not sure how long that
> would need to operate without loss to determine success.
>                                                         -- Steve
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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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