[Ovmsdev] WiFi client not switching to better AP

Stephen Casner casner at acm.org
Thu Dec 17 06:26:50 HKT 2020

Following up: I see that OvmsNetManager::WifiStaGotIP() calls
WifiStaCheckSQ() at the start of the connection, but it looks like the
radio hasn't fully adapted yet or something.  The signal quality can
be -95.5 -99.2 dBm and sometimes even -127.0 dBm, which looks like an
uninitialized value, even though wifi scan says the RSSI is -60.  (Is
RSSI calibrated to dBm for this system?)

If I stop the looping by "wifi mode off" and "wifi mode client" then I
see a good signal quality -79.3 reported after getting IP, and then if
I do "wifi status" the reported signal quality is -56.0 dBm.  This is
all with my test OVMS v3.0 sitting on my desk.

So would it make sense to introduce some delay here if the signal
quality is not good enough yet?

                                                        -- Steve

On Mon, 14 Dec 2020, Stephen Casner wrote:

> On Mon, 7 Dec 2020, Michael Balzer wrote:
> > If you don't mind frequent disconnects in poor Wifi situations, a simple
> > solution now is to attach a "wifi reconnect" command call to the
> > "network.wifi.sta.bad" event. I added that command on the Wifi rework some
> > months ago.
> I tested this today with the three APs in my home but ran into
> trouble.  It looks like the event was emitted again at the end of the
> reconnection process so another reconnect was performed and it kept
> looping.  See the attached log.  I have not investigated this
> carefully.
> > For a better, general solution, we could e.g. count the "network.wifi.sta.bad"
> > events on the same network (or better: check the event frequency) and
> > disconnect when reaching some (tunable) threshold. The next automatic scan
> > then connects to the best network available. Getting stuck in the "bad signal"
> > state for too long would also need to trigger a disconnect.
> I'll look at this further to see whether a smooth transition from one
> AP to another on the same network is possible.
>                                                         -- Steve

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