When connecting to the wifi i frequently get an 201 Auth failed error. I traced this back and found that the issue started with version 0.12
The error appears when i start of the code of my RobustWifiServer (arduinolibs/wifi at master · gmoehler/arduinolibs · GitHub), which is a try to create a wifi server that reconnects when issues appear using a state approach (side remark: comments on that piece of code is highly appreciated btw).
Server startup behind the scenes should be nothing else than
[in setup]
_server = WiFiServer(serverPort);
[in loop]
WiFi.mode(WIFI_STA); // "station" mode
WiFi.config(_ip, _gateway, _subnet); // set specific ip...
WiFi.begin(_ssid.c_str(), _wifiPassword.c_str()); // connect to router
I usually do a esptool.py --port COM4 erase_flash before program upload to be on the save side. Sometimes i have to repeat the erase_flase - upload cycle twice before i run into the issue.
When i start up the server what i get in 0.12.0 onward is:
Connecting to Wifi with SSID MY_SSID7 & ip 192.168.1.127...
>> Wifi Event: Wifi ready.
>> Wifi Event: AP stop
>> Wifi Event: Wifi started...
>> Wifi Event: Wifi started...
>> Wifi Event: WiFi lost connection.
Reason: 201 - AUTH_FAIL
WiFi state: WL_NO_SSID_AVAIL
The wifi state turns from WL_DISCONNECTED to WL_NO_SSID_AVAIL due to an auth fail event. Any following connection tries will not even try to connect and hang in WL_NO_SSID_AVAIL state (although the SSID scan finds the router).
Platform.io versions connection 0.11.1 and earlier connect just fine (server starts and waits for clients).
Does anyone have a clue what could go wrong. If the code is too complicated to follow i could minimize it to to a snippet that illustrates the problem.
BTW there is some similarity to the issue ESP32 issues connecting Wifi network - #2 by ivankravets, but the hints there did not help.