[Ovmsdev] Wifi setup

Sat Jul 11 01:46:55 HKT 2020

It seems I've found a real issue with the new implementation, I don't
know how to explain:

With the new implementation, mongoose fails to establish a HTTP
connection to my Edimax smart plug. Just that device, every other host
works correctly, also with SSL.

The mg_connect_http_opt() call fails after 18 seconds with error 113
"Software caused connection abort" … which may be a timeout or the LWIP
error code 113 "No route to host" passed through by mongoose.

Same behaviour in both client & apclient mode, fixed & scanning.

The Edimax is on the same network as the module (connected to the same
AP) and perfectly reachable from all other stations (and the build
before). Netmask and gateway are correct. Also the wifi connect is still
done by the esp_wifi_connect() call, so there should be no difference…?

I'm puzzled. Any ideas? Any other hosts that cannot be connected to with
the new version?

To test a host, use this JS snippet in the editor with a URL of a small
page or non existent file on the host:

HTTP.Request({
  url: "http://…",
  always: function() { JSON.print(this, false); }
});

Regards,
Michael

Am 10.07.20 um 15:21 schrieb Michael Balzer:
> The dhcps log messages aren't new, I've had these all the time before,
> also sometimes repeating for some period.
>
> Also not new are these messages:
>
> I (8771413) wifi: ampdu: ignore deleting tx BA0
> I (8774723) wifi: ampdu: ignore deleting tx BA0
> I (8784043) wifi: ampdu: ignore deleting tx BA0
> I (8787253) wifi: ampdu: ignore deleting tx BA0
> I (8793673) wifi: ampdu: ignore deleting tx BA0
> I (8797813) wifi: ampdu: ignore deleting tx BA0
>
> They now start consistently after doing a scan from a web client
> connected via the AP. They stop when the client disconnects. Seem to
> be coupled to the websocket somehow. I've found these in my log
> archives as well, no clue about the trigger. No issue other than
> annoying log spam though, everything works normally.
>
> Regards,
> Michael
>
>
> Am 10.07.20 um 14:36 schrieb Mark Webb-Johnson:
>> Working for me on my test bench device. I’m building EDGE now.
>>
>> Only strange thing so far is I am seeing this message repeatedly in
>> apclient mode:
>>
>>     dhcps: send_nak>>udp_sendto result 0
>>
>>
>> Can’t work out the timing, as it seems to be random. I’ll keep looking...
>>
>> Regards, Mark
>>
>>> On 10 Jul 2020, at 7:42 PM, Michael Balzer <dexter at expeedo.de
>>> <mailto:dexter at expeedo.de>> wrote:
>>>
>>> Everyone,
>>>
>>> the wifi rework is pushed:
>>> https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/commit/5d1f124060326b92f35887878b4d49c8012542dc
>>> …and the new edge build is on my server.
>>>
>>> This now allows to scan for networks in all modes without disruption
>>> of a running wifi network.
>>>
>>> I've used this to also add a network selection dialog to the setup
>>> wizard & wifi config.
>>>
>>> The apclient mode can now be started without a client SSID to let
>>> the module automatically connect to any network configured. The
>>> autostart config page now allows this setup. The special "scanning
>>> client" mode has been removed.
>>>
>>> The wifi manager will still stick to an established connection, even
>>> if a new network with higher signal strength becomes available. I
>>> thought about automatically switching networks if the signal gets
>>> poor, but for now decided against it to avoid frequent network
>>> reconfigurations in edge cases. If you want the module to explicitly
>>> scan for a better network, issue "wifi reconnect".
>>>
>>> Of course this has involved some changes to the wifi manager, so
>>> please test & report.
>>>
>>> Regards,
>>> Michael
>>>
>>>
>>> Am 10.07.20 um 08:57 schrieb Michael Balzer:
>>>> TL;DR: yes, I'm currently also going towards not letting
>>>> esp_wifi_connect() decide which AP to connect to.
>>>>
>>>> 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.
>>>>
>>>> Example:
>>>>
>>>> D (5034) events: Signal(system.wifi.scan.done)
>>>> V (5034) esp32wifi: ScanDone: #01 ssid='WLAN-214677'
>>>> bssid='7c:ff:4d:15:2f:86' chan=11 rssi=-64
>>>> V (5034) esp32wifi: ScanDone: #02 ssid='WLAN-214677'
>>>> bssid='94:4a:0c:c3:9e:63' chan=11 rssi=-77
>>>> I (5044) esp32wifi: Found SSID WLAN-214677 - trying to connect
>>>> I (7564) esp32wifi: STA connected with SSID: WLAN-214677, BSSID:
>>>> 94:4a:0c:c3:9e:63, Channel: 11, Auth: WPA2
>>>>
>>>> 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.
>>>>
>>>> On all following reconnects on the running system it will correctly
>>>> pick the 7c:ff AP, also if wifi is stopped & restarted.
>>>>
>>>> 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.
>>>>
>>>> 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.
>>>>
>>>> Regards,
>>>> Michael
>>>>
>>>>
>>>> Am 10.07.20 um 02:55 schrieb Mark Webb-Johnson:
>>>>> FYI:
>>>>>
>>>>> 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.
>>>>>
>>>>> That approach might help with your other issue (recently raised in
>>>>> mantis).
>>>>>
>>>>> Regards, Mark.
>>>>>
>>>>>> On 10 Jul 2020, at 5:43 AM, Michael Balzer <dexter at expeedo.de> wrote:
>>>>>>
>>>>>>  Welcome Derek,
>>>>>>
>>>>>> 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 ;-)
>>>>>>
>>>>>> Regards,
>>>>>> Michael
>>>>>>
>>>>>>
>>>>>> Am 09.07.20 um 20:50 schrieb Derek Caudwell:
>>>>>>> Hi devs,
>>>>>>>
>>>>>>> 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). 
>>>>>>>
>>>>>>> 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.
>>>>>>>
>>>>>>> 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:
>>>>>>>  - 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?
>>>>>>>     - 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?
>>>>>>>  - 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
>>>>>>>  - 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? 
>>>>>>>
>>>>>>> Thanks in advance for any pointers and background.
>>>>>>>
>>>>>>> Cheers Derek
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> OvmsDev mailing list
>>>>>>> OvmsDev at lists.openvehicles.com
>>>>>>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>>>>>
>>>>>> -- 
>>>>>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>>>>>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>>>>>> _______________________________________________
>>>>>> OvmsDev mailing list
>>>>>> OvmsDev at lists.openvehicles.com
>>>>>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>>>>
>>>>> _______________________________________________
>>>>> OvmsDev mailing list
>>>>> OvmsDev at lists.openvehicles.com
>>>>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>>>
>>>> -- 
>>>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>>>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>>>>
>>>> _______________________________________________
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>>>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>>
>>> -- 
>>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>>> _______________________________________________
>>> OvmsDev mailing list
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>>
>>
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>
> -- 
> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>
> _______________________________________________
> OvmsDev mailing list
> OvmsDev at lists.openvehicles.com
> http://lists.openvehicles.com/mailman/listinfo/ovmsdev

-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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