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TL;DR: yes, I'm currently also going towards not letting
esp_wifi_connect() decide which AP to connect to.<br>
<br>
More precisely, exactly the first (!) call to esp_wifi_connect()
after a reboot/power up seems to do a round robin scheme among all
reachable access points of a network regardless of their signal
strength. This even applies to the first connect() immediately after
a scan.<br>
<br>
Example:<br>
<br>
D (5034) events: Signal(system.wifi.scan.done)<br>
V (5034) esp32wifi: ScanDone: #01 ssid='WLAN-214677'
bssid='7c:ff:4d:15:2f:86' chan=11 rssi=-64<br>
V (5034) esp32wifi: ScanDone: #02 ssid='WLAN-214677'
bssid='94:4a:0c:c3:9e:63' chan=11 rssi=-77<br>
I (5044) esp32wifi: Found SSID WLAN-214677 - trying to connect<br>
I (7564) esp32wifi: STA connected with SSID: WLAN-214677, BSSID:
94:4a:0c:c3:9e:63, Channel: 11, Auth: WPA2<br>
<br>
The next reboot will connect to 7c:ff (despite unchanged signal
strengths), the next again to 94:4a and so on. I've only got two
access points, so I can't test if it's really round-robin, but it's
wrong anyway.<br>
<br>
On all following reconnects on the running system it will correctly
pick the 7c:ff AP, also if wifi is stopped & restarted.<br>
<br>
This AP switching behaviour also persists powering off the module,
so the wifi blob seems to do this on purpose and even use some
persistent storage to implement it. Totally undocumented and I've
found no way to disable this and no workaround so far.<br>
<br>
There may be a fix for this in the current esp-idf wifi blob, but
I've found no issues on this, and esp-idf commit comments are mostly
not useful.<br>
<br>
Regards,<br>
Michael<br>
<br>
<br>
<div class="moz-cite-prefix">Am 10.07.20 um 02:55 schrieb Mark
Webb-Johnson:<br>
</div>
<blockquote type="cite"
cite="mid:CFB768E9-8101-495C-8826-085302DDB0C9@webb-johnson.net">
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<div dir="ltr">FYI:</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">I’ve recently done some work with the esphome
system (based on platformio on top of esp idf), for home
automation. They don’t seem to trust the ESP libraries
identifying the strongest signal (in the case of two APs
broadcasting the same SSID). They don’t blindly connect to a
SSID, but instead first do a scan to produce an ordered list and
then connect to the SSID+AP-MAC-Address of the AP with the
strongest signal.</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">That approach might help with your other issue
(recently raised in mantis).</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Regards, Mark.</div>
<div dir="ltr"><br>
<blockquote type="cite">On 10 Jul 2020, at 5:43 AM, Michael
Balzer <a class="moz-txt-link-rfc2396E" href="mailto:dexter@expeedo.de"><dexter@expeedo.de></a> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">
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charset=UTF-8">
Welcome Derek,<br>
<br>
I've got a rework of the wifi component near done that allows
to use scanning mode in apclient configuration. I think I can
push the changes tomorrow & suggest you'll be my beta
tester ;-)<br>
<br>
Regards,<br>
Michael<br>
<br>
<br>
<div class="moz-cite-prefix">Am 09.07.20 um 20:50 schrieb
Derek Caudwell:<br>
</div>
<blockquote type="cite"
cite="mid:CAKUcfWFUou6q-PGaZGxJh2iZa48=Lyho-ehfOBGyqQ37C7S4Wg@mail.gmail.com">
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<div dir="ltr">Hi devs,
<div><br>
</div>
<div>I recently received the ovms hardware and have been
trying to setup the unit so I can solely use the wifi
AP+client. In NZ 3G is soon to be sunset and for my
needs I don't really need a connection when I'm driving
(and want to make sure everything is behaving nicely on
the can bus before I do). </div>
<div><br>
</div>
<div>I realise AP+client brings it limitations however
hopefully some of these can be worked around as I want
to be able to use the dashboard/plugins as well as the
mobile app. I am new to C/ESP32 programming and the code
base so I thought it best to ask a few questions before
I begin tinkering with it.</div>
<div><br>
</div>
<div>Ideally I want the unit on loss of connection to an
AP to try and find another AP that has been set in the
wifi config and connect. The parts I am not too sure are
as follows:</div>
<div> - on boot the code uses the default wifi ssid, if
the default is not available how does the code try and
switch to one of the other saved APs?</div>
<div> - can multiple APs be saved to the wifi config
memory and handled by ESP32? or do they need to be
retrieved from ovms config, wifi client details set, try
connect and enumerated through?</div>
<div> - I assume EventTimer10 is the logical place to add
extra code if required to enumerate through APs and try
to connect? similar to EventScanWifiDone when in SClient
mode</div>
<div> - What is the reason scanning mode is unavailable
for AP+client mode in auto init, from the ESP32
documentation it appeared to be usable still but with
limitations? </div>
<div><br>
</div>
<div>Thanks in advance for any pointers and background.</div>
<div><br>
</div>
<div>Cheers Derek</div>
</div>
<br>
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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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<pre class="moz-signature" cols="72">--
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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