MultiWifi

#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>


ESP8266WiFiMulti wifiMulti;

void setup() {
  // put your setup code here, to run once:
 Serial.begin(115200);

  WiFi.mode(WIFI_STA);
  wifiMulti.addAP("xxx", "xxx");
  wifiMulti.addAP("xxx", "xxx");
 // wifiMulti.addAP("xxx", "xxx");

  Serial.println("Connecting Wifi...");
  if (wifiMulti.run() == WL_CONNECTED) {
    Serial.println("");
    Serial.println("WiFi connected");
    Serial.println("IP address: ");
    Serial.println(WiFi.localIP());
  }
}

void loop() {
  // put your main code here, to run repeatedly:
 if (wifiMulti.run() != WL_CONNECTED) {
    Serial.println("WiFi not connected!");
    delay(1000);
}
}