Arduino ESP32 WIFI - Multiple Wireless Networks

wifi_multi.ino

#include <WiFi.h>
#include <WiFiMulti.h>

WiFiMulti wifiMulti;

void setup()
{
    Serial.begin(115200);
    Serial.println("Lonely Binary ESP32 Multi Wifi Example");

    /*
        Add your home, office APs here, as many access points as you like
        ESP32 will use the available access point with the strognest signal.
    */
    wifiMulti.addAP("ssid_from_AP_1", "your_password_for_AP_1");
    wifiMulti.addAP("ssid_from_AP_2", "your_password_for_AP_2");
    wifiMulti.addAP("ssid_from_AP_3", "your_password_for_AP_3");

    /*
        The function wifiMulti.run() executes a WiFi scan initially,
        aiming to connect to the access point (AP) with the strongest
        signal from the list of APs provided using wifiMulti.addAP() methods.
        If the ESP32 fails to establish a connection with the chosen AP
        within the default timeout period of 5 seconds,
        it will abandon the attempt and return an error message.
    */
    Serial.println("Connecting Wifi...");
    if (wifiMulti.run() == WL_CONNECTED)
    {
        Serial.println("");
        Serial.println("WiFi connected");
        Serial.print("ESP32's IP Address : ");
        Serial.println(WiFi.localIP());
        Serial.print("ESP32's Mac Adress : ");
        Serial.println(WiFi.macAddress());
        Serial.print("ESP32's Subnet Mask: ");
        Serial.println(WiFi.subnetMask());
        Serial.print("ESP32's Gateway IP: ");
        Serial.println(WiFi.gatewayIP());
        Serial.print("ESP32's DNS: ");
        Serial.println(WiFi.dnsIP());
        Serial.print("Wireless SSID : ");
        Serial.println(WiFi.SSID());
        Serial.print("Wireless AP's Mac Address : ");
        Serial.println(WiFi.BSSIDstr());
        Serial.print("Wireless Channel : ");
        Serial.println(WiFi.channel());
        Serial.print("Wireless Signal Strength : ");
        Serial.println(WiFi.RSSI());
    }
}

void loop()
{
    /*
        If wifi is disconnected, reconnect again,
        if  all wifis are not available, print message on serial monitor
    */
    if (wifiMulti.run() != WL_CONNECTED)
    {
        Serial.println("WiFi not connected!");
        delay(1000);
    }
}