#include "WiFi.h"
int rssi_pre_val=-120;
int wifi_no=1;
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");
        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)?" ":"*");
            // here i check the rssi value to each network and compare it with rssi_pre_val which will conatin the closest rssi value to zero 
            if (WiFi.RSSI(i)>rssi_pre_val){
              //save the value to compare it with the next one 
              rssi_pre_val=WiFi.RSSI(i);
              // save the wifilist number  
              wifi_no=i;
            }
            delay(10);
        }
           // print the name of the strongest wifi 
            Serial.print(WiFi.SSID(wifi_no));
            Serial.print(" (");
            Serial.print(WiFi.RSSI(wifi_no));
            Serial.print(")");
            Serial.print(" : ");
            Serial.print(" is strongest wifi signal network");
    }
    Serial.println("");
    Serial.println("");

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