#include "WiFi.h"
void setup()
{
Serial.begin(115200);
// Set WiFi to station mode and disconnect from an AP if it was previously connected.
WiFi.mode(WIFI_STA);
WiFi.disconnect();
delay(100);
Serial.println("Setup done");
}
void loop()
{
Serial.println("Scan start");
// WiFi.scanNetworks will return the number of networks found.
int n = WiFi.scanNetworks();
Serial.println("Scan done"); 
if (n == 0) { 
Serial.println("no networks found"); 
} else { 
Serial.print(n); 
Serial.println(" networks found"); 
Serial.println("Nr | SSID | RSSI | CH | Encryption"); 
for (int i = 0; i < n; ++i) { 
// Print SSID and RSSI for each network found 
Serial.printf("%2d",i + 1); 
Serial.print(" | "); 
Serial.printf("%-32.32s", WiFi.SSID(i).c_str()); 
Serial.print(" | "); 
Serial.printf("%4d", WiFi.RSSI(i)); 
Serial.print(" | "); 
Serial.printf("%2d", WiFi.channel(i)); 
Serial.print(" | "); 
switch (WiFi.encryptionType(i)) 
{ 
case WIFI_AUTH_OPEN: 
Serial.print("open"); 
break; 
case WIFI_AUTH_WEP: 
Serial.print("WEP"); 
break; 
case WIFI_AUTH_WPA_PSK: 
Serial.print("WPA"); 
break; 
case WIFI_AUTH_WPA2_PSK: 
Serial.print("WPA2"); 
break; 
case WIFI_AUTH_WPA_WPA2_PSK: 
Serial.print("WPA+WPA2"); 
break; 
case WIFI_AUTH_WPA2_ENTERPRISE: 
Serial.print("WPA2-EAP"); 
break; 
case WIFI_AUTH_WPA3_PSK: 
Serial.print("WPA3"); 
break;
case WIFI_AUTH_WPA2_WPA3_PSK: 
Serial.print("WPA2+WPA3"); 
break; 
case WIFI_AUTH_WAPI_PSK: 
Serial.print("WAPI"); 
break; 
default: 
Serial.print("unknown"); 
} 
Serial.println(); 
delay(10); 
} 
} 
Serial.println(""); 
// Delete the scan result to free memory for code below. 
WiFi.scanDelete(); 
// Wait a bit before scanning again. 
delay(5000);
}