//
// 13.12.2019 - MQTT Sub - turn LED on/off
//


// biblioteki dla MQTT
#include <ESP8266WiFi.h>
#include <PubSubClient.h>


// global variables for MQTT
const char* ssid = "WSG-Mobilna pracownia"; // Enter your WiFi name
const char* password =  "M0b1lnaPracown1a"; // Enter WiFi password
const char* mqttServer = "farmer.cloudmqtt.com";
const int mqttPort = 11031;
const char* mqttUser = "lffcjqaq";
const char* mqttPassword = "e-tfKE3oDkAJ";


WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  // komunikacja przes port szeregowy - 9600 baud
  Serial.begin(9600);

  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, HIGH);  // turn LED off

  // start komunikacji przes WiFi
  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);

  // connect do MQTT broker
  while (!client.connected())
  {
     Serial.println("Connecting to MQTT...");
     if (client.connect("ESP8266Client", mqttUser, mqttPassword ))
     {
       Serial.println("connected");
     }
     else
     {
      Serial.print("failed with state ");
      Serial.println(client.state());
      delay(2000);
     }
  }
  client.subscribe("esp/test");

}

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++)
  {
    Serial.print((char) payload[i]);
  }

  Serial.println();
  Serial.println("-----------------------");
  if (payload[0] == '0')
  {
    digitalWrite(LED_BUILTIN, HIGH);
  }
  if (payload[0] == '1')
  {
    digitalWrite(LED_BUILTIN, LOW);
  }

}

void loop() {

  client.loop();
}