suggest to match the scanNetworks() parameters to be identical of that of the ESP8266

[pabloandresm]

arduino-esp32/libraries/WiFi/src/WiFiScan.h

Line 34 in a1d8b95

int16_t scanNetworks(bool async = false, bool show_hidden = false, bool passive = false, uint32_t max_ms_per_chan = 300, uint8_t channel = 0);

The ESP8266 will be:
scanNetworks(bool async = false, bool show_hidden = false, bool passive = false, uint32_t max_ms_per_chan = 300, uint8_t channel = 0, uint8* ssid = NULL);
after this fix: dok-net/arduino-esp8266@7941c1a

pull esp8266/Arduino#8073

It would be nice to add the last parameter "uint8* ssid = NULL" so the ESP32 scanNetworks() will be compatible with the one of the ESP8266.

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