#include <ESP8266WiFi.h>
#include <PubSubClient.h>

const char* ssid = "MAHAKAL";
const char* password = "8527669889";
const int led = 13;

const char* mqtt_server = "192.168.1.8";

WiFiClient espClient;
PubSubClient client(espClient);

const int ledGPIO2 = 2;

void setup_wifi() {
  int i;
  delay(10);

  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.println("WIFI BEGUN");
  while (WiFi.status() != WL_CONNECTED) {
    ESP.wdtFeed();
    delay(500);
    i++;
    if ((i&0x01)==0){
      digitalWrite(led, 0);
    } else {
      digitalWrite(led, 1);     // led should start blinking at .5 seconds
    }
    Serial.print(".");
    if (i>1000) break;     // get out after 50 seconds
  
  if (i==1000){
    
  }
    Serial.print(".");
    
  Serial.println("");
  Serial.print("WiFi connected - ESP IP address: ");
  Serial.println(WiFi.localIP());
  }
}

void callback(String topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.print(topic);
  Serial.print(". Message: ");
  String messageTemp;

  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    messageTemp += (char)message[i];
  }
  Serial.println();

  if(topic=="Lamp1"){
      Serial.print("Changing GPIO 2 to ");
      if(messageTemp == "on"){
        digitalWrite(ledGPIO2, HIGH);
        Serial.print("On");
      }
      else if(messageTemp == "off"){
        digitalWrite(ledGPIO2, LOW);
        Serial.print("Off");
      }
  }
  Serial.println();
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESP8266Client")) {
      Serial.println("connected");  

      client.subscribe("Lamp1");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
  // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void setup() {
  pinMode(ledGPIO2, OUTPUT);
  digitalWrite(ledGPIO2, true);
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);    
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  if(!client.loop())
    client.connect("ESP8266Client");
}