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

const char* ssid = "Tenda";
const char* password =  "asdf1234";
const char* mqttServer = "m11.cloudmqtt.com";
const int mqttPort = 17735;
const char* mqttUser = "hitcmgji";
const char* mqttPassword = "QtOnRR0io93j";
const char* topics[2] = {"esp/relay1","esp/relay2"};

WiFiClient espClient;
PubSubClient client(espClient);

void setupRelay(){
   for(int i=0;i<sizeof(relay);i++){
      pinMode(relay[i],OUTPUT);
      digitalWrite(relay[i],HIGH);
    }
}

void setup() {

  Serial.begin(115200);
  setupRelay();
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Connecting to WiFi..");
  }
  Serial.println("Connected to the WiFi network");

  client.setServer(mqttServer, mqttPort);
  client.setCallback(callback);

  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");

    if (client.connect("ESP8266Client", mqttUser, mqttPassword )) {

      Serial.println("connected");

    } else {

      Serial.print("failed with state ");
      Serial.print(client.state());
      delay(2000);

    }
  }

  for(int i=0;i<sizeof(topics);i++){
    client.subscribe(topics[i]);
    client.publish(topics[i], "Hello from ESP8266");
  }

}

void callback(char* topic, byte* payload, unsigned int length) {

  Serial.print("Message arrived in topic: ");
  Serial.println(topic);

  Serial.print("Message:");
  for (int i = 0; i < length; i++) {
    switch(topic){
      case topic[0]:
        if((char)payload[i]=="ON"){
          pinMode(D1,OUTPUT);
          digitalWrite(D1,LOW);
          break;
        }else if((char)payload[i]=="OFF"){
          pinMode(D1,OUTPUT);
          digitalWrite(D1,HIGH);
          break;
        }
      case topic[1]:
        if((char)payload[i]=="ON"){
          pinMode(D2,OUTPUT);
          digitalWrite(D2,LOW);
          break;
        }else if((char)payload[i]=="OFF"){
          pinMode(D2,OUTPUT);
          digitalWrite(D2,HIGH);
          break;
        }
    }
  }

  Serial.println();
  Serial.println("-----------------------");

}

void loop() {
  client.loop();
}