esp8266_wifi_test.ino

#include <ESP8266WiFi.h>

const char* ssid = "";
const char* password = "";

void setup() {
  Serial.begin(115200);
  delay(100);

  WiFi.begin(ssid, password);
  
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected successful");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
}

void loop() {
  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("PLEASE CONNECT TO THE WIFI NETWORK");
    
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
    }
    Serial.println("");
    Serial.println("WiFi reconnected");
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
  }
  delay(1000);
}