esp8266 nuances/bugs/workarounds

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logging all workarounds and nuances and SDK bugs

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• Sometimes when set to a non existing AP, on IOS I cannot connect to AP "Unable to connect to Access Point" even though I have sta mode disabling before starting AP, could be related to large number of APs around, but it almost never occurs when STA is connected to a good AP. So something is odd, or stuck still.

I have tried the following to correct with no effect (in addition to disconnect and mode(AP))

    wifi_station_dhcpc_stop();
    WiFi.setAutoConnect(false);
    WiFi.setAutoReconnect(false);
    wifi_set_sleep_type(NONE_SLEEP_T);

You can see how unreliable the AP is when in this mode, something is still causing this in the SDK radio

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Unable to connect to SoftAP

If esp has ap config default ( anonymous in my test )
persistent wifi mode AP+STA ( sta connected )
StartAP(name,password)

I get invalid password, or unable to connect errors, no debugging info available.
IOS will not connect at all. Windows is flaky, but will connect usually.

Will create repro sketch

Cannot reproduce in 2.3.1( hope its fixed in SDK )

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Cannot erase flash
esp8266/Arduino#1494
esp8266/Arduino#2885
esp8266/Arduino#3635 <-- OMG how has this never been fixed until now

ESP.restart()
ESP.reset()
while(1)

Do not help.

EDIT:
Working good now, but if no 3635 bugfix, you can get paramerrors or erase flash not working completely ( eg, opmode default stays STA+AP). Adding a polyfill

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I have submitted PRs for these to esp8266/arduino, I doubt they will get aprooved anytime soon, if you guys could upvote them, that might help.

persistent state bugs

These bugs, cause problems switching modes, when persistent is toggled off and on, esp core assumes current and default configs are in sync, when they are not always so.
esp8266/Arduino#3799
MERGED

workaround:
not yet available

BUG: softAPdisconnect return value corruption

This causes softAPdisconnect to fail always, this prevents saving state when persistent is on
esp8266/Arduino#3795
MERGED

workaround:
not yet available

BUG: softAPdisconnect fails

This causes softAPdisconnect to incorrectly return success status if wifioff is true, as ret val gets overwritten.
esp8266/Arduino#3793
MERGED

workaround:
not yet available

[tablatronix]

softap
[AP] set_config failed!
esp8266/Arduino#4372
[OPEN]