#include "WiFi.h"

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("initializing WiFi...");
  WiFi.mode(WIFI_STA);
  Serial.println("setup done!");
}

void loop() {
  Serial.println("Scanning...");
  //Wifi.scanNetworks will return the number of network found 
  int n = WiFi.scanNetworks();
  Serial.println("Scan done!");
  if (n == 0) {
    Serial.println("No networks found.");
  }else {
    Serial.println();
    Serial.print(n);
    Serial.println(" networks found");
    for (int i = 0; i < n; ++i) {
      //print SSID and RSSI for each network found 
      Serial.print(i + 1);
      Serial.print(": ");
      Serial.print(WiFi.SSID(i));
      Serial.print(" (");
      Serial.print(WiFi.RSSI(i));
      Serial.print(" (");
      Serial.println((WiFi.encryptionType(i) == WIFI_AUTH_OPEN) ? " " : "*");
      delay(10);
    }
  }
  Serial.println(" ");

  //wait a bit before scanning again 
  delay(5000);
}