Reconfigure WiFi / Pool address / Wallet

As after the first configuration and reboot the web interface stops responding it is useful sometimes to be able to reconfigure the board to connect to another Wifi network, another pool or change the wallet address. It is understandable the web server may use valuable resources that can impact on the hashrate. A few ways I see this can be achieve are:

1 - If simply leaving the web server enabled doesn't use any extra CPU resources when there is no opened connections it can be left with a simple form page that doesn't use CPU resources (like to show updated hashrate or other details) and through the web interface be able to change these details, save and reboot.

2 - If that is not possible, than through the pressing of the flash/boot bottom stop the mining job and start the web server. In order to give feedback to the user blink the ESP light in a certain sequence to confirm the change, and keep blinking in a different way to show that it is not mining and waiting with the web server running.

3 - If the board is taken to another place where the SSID previously configured cannot connect, the ESP notice that after some time, configure itself in AP mode and start the web server for a new configuration.

4 - If none of the above is worth implementing, simply if the flash/boot button is pressed for a few seconds while it is running (not before power on) the ESP resets its configuration and reboot in the default firmware configuration. In the case of ESP8266 Devkit can't the flash/boot button be used for this as well ?

Start by reviewing the existing WiFi configuration, web interface, mining lifecycle, and flash/boot-button handling for the ESP8266 and ESP32. The issue presents several alternative recovery designs, so first establish which approach is wanted. Done should allow changing WiFi, pool, or wallet settings and provide a reliable save-and-reboot or recovery state without leaving mining behavior ambiguous.