WiFi.BSSID and scan result BSSID with parameter as in WiFi libraries by Arduino

[JAndrassy]

Arduino doc on BSSID getters: https://www.arduino.cc/reference/en/libraries/wifi/wifi.bssid/

I compared more than a dozen of Arduino Networking libraries to find the common API for Arduino networking. Then I wrote a test sketch which checks how a library complies to this common API.

ESP32 Arduino WiFi library was based on ESP8266 Arduino WiFi library which was based on the first WiFi library by Arduino. Arduino later created more WiFi libraries and the API diverged, but at least with the most recent library they looked at the ESP32 WiFi library for new method names (for example dnsIP(n)).

While doing the research and tests I do PR in Arduino networking libraries repositories with in most cases simple modifications to unify the API where it doesn't break the library (for example I will not ask esp8266 and esp32 maintainers to make WiFi.begin blocking :-) ).

Similar PR by me was recently merged in esp8266 Arduino repository.

[SuGlider]

@JAndrassy - It sounds good to make it compatible to upstream Arduino WiFi API.
I'd suggest to unify the APIs, instead of creating a second one.

Something like:
unique API would be just uint8_t * BSSID(uint8_t networkItem, uint8_t* bssid = NULL); and uint8_t * BSSID(uint8_t* bssid = NULL);
The code shall test bssid != NULL before copying the information into it.

[SuGlider]

Thanks! LGTM