FIND MY ESP IP

How it works?

You and your ESP need to be one local network. ESP send GET:

"http://www.onclick.lv/esp/?mac="+WiFi.macAddress()+"&ip="+WiFi.localIP().toString(); 

#include < ESP8266WiFi.h>
#include < ESP8266HTTPClient.h>
const char* ssid = "yourNetworkName";
const char* password = "yourNetworkPassword";
String url = "http://www.onclick.lv/esp/?mac="+WiFi.macAddress()+"&ip="+WiFi.localIP().toString();
void setup () {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print("Connecting..");
  }
}
void loop() {
  if (WiFi.status() == WL_CONNECTED) {  //Check WiFi connection status
    HTTPClient http;  //Declare an object of class HTTPClient
    http.begin(url);
    int httpCode = http.GET();  //Send the request
    http.end();  //Close connection
  }
  delay(30000);  //Send a request every 30 seconds
}