code_esp8266

#include <ESP8266WiFi.h>
WiFiClient client;
WiFiServer server(80);

/* WIFI settings */
const char* ssid = " WIFI_NAME ";   //WIFI SSID
const char* password = " WIFI_PASSWORD ";    //WIFI PASSWORD

/* data received from application */
String  data =""; 

/* define L298N or L293D motor control pins */
int Relay1 = 2; 


void setup()
{
  
  /* initialize control pins as output */
  
  pinMode(Relay1, OUTPUT);
  
  digitalWrite(Relay1,LOW);
  //LOW one will be turned on 
  
  
  /* start server communication */
  Serial.begin(115200);
  connectWiFi();
  server.begin();
}

void loop()
{
    /* If the server available, run the "checkClient" function */  
    client = server.available();
    if (!client) return; 
    data = checkClient ();
    Serial.print(data);
    /************************ Run function according to incoming data from application *************************/
    if (data == "1")   digitalWrite(Relay1,HIGH);
    else if (data == "2")   digitalWrite(Relay1,LOW);
} 

void connectWiFi()
{
  Serial.println("Connecting to WIFI");
  WiFi.begin(ssid, password);
  while ((!(WiFi.status() == WL_CONNECTED)))
  {
    delay(300);
    Serial.print("..");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("NodeMCU Local IP is : ");
  Serial.print((WiFi.localIP()));
}
/********************************** RECEIVE DATA FROM the APP ******************************************/
String checkClient (void)
{
  while(!client.available()) delay(1); 
  String request = client.readStringUntil('\r');
  request.remove(0, 5);
  request.remove(request.length()-9,9);
  return request;
}