//// IMPORTANT NOTICE (Fab Academy 2020 / Laru
//// This code is a remix of following projects done by others:
///  1. https://randomnerdtutorials.com/esp8266-and-node-red-with-mqtt/ (how to use MQTT and Nodered, but NOT how to use DIT sensor, because i didn't have that component)
///  2. https://lastminuteengineers.com/bme280-esp8266-weather-station/ (to learn how to use BME sensor, because I didn't have DIT sensor)
///  Libraries that I used to use BME sensor didn't have function to compute heatindex, so I have disabled it from this code below.

<code>#include <Adafruit_Sensor.h></code>
#include <Adafruit_BME280.h>
#include <Wire.h>
#include <ESP8266WiFi.h>
#include <PubSubClient.h>

//define adafruit bme820 sensor
Adafruit_BME280 bme;

//

// Change the credentials below, so your ESP8266 connects to your router
const char* ssid = "ubinotko1";
const char* password = "";

// Change the variable to your Raspberry Pi IP address, so it connects to your MQTT broker
const char* mqtt_server = "192.168.100.47";

// Initializes the espClient. You should change the espClient name if you have multiple ESPs running in your home automation system
WiFiClient espClient;
PubSubClient client(espClient);


// Lamp - define port to be used
const int lamp = 2;



// Timers auxiliar variables
long now = millis();
long lastMeasure = 0;

// Don't change the function below. This functions connects your ESP8266 to your router
void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("WiFi connected - ESP IP address: ");
  Serial.println(WiFi.localIP());
}

// This functions is executed when some device publishes a message to a topic that your ESP8266 is subscribed to
// Change the function below to add logic to your program, so when a device publishes a message to a topic that 
// your ESP8266 is subscribed you can actually do something
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();

  // Feel free to add more if statements to control more GPIOs with MQTT

  // If a message is received on the topic room/lamp, you check if the message is either on or off. Turns the lamp GPIO according to the message
  if(topic=="room/lamp"){
      Serial.print("Changing Room lamp to ");
      if(messageTemp == "on"){
        digitalWrite(lamp, HIGH);
        Serial.print("On");
      }
      else if(messageTemp == "off"){
        digitalWrite(lamp, LOW);
        Serial.print("Off");
      }
  }
  Serial.println();
}

// This functions reconnects your ESP8266 to your MQTT broker
// Change the function below if you want to subscribe to more topics with your ESP8266 
void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    /*
     YOU MIGHT NEED TO CHANGE THIS LINE, IF YOU'RE HAVING PROBLEMS WITH MQTT MULTIPLE CONNECTIONS
     To change the ESP device ID, you will have to give a new name to the ESP8266.
     Here's how it looks:
       if (client.connect("ESP8266Client")) {
     You can do it like this:
       if (client.connect("ESP1_Office")) {
     Then, for the other ESP:
       if (client.connect("ESP2_Garage")) {
      That should solve your MQTT multiple connections problem
    */
    if (client.connect("ESP8266Client")) {
      Serial.println("connected");  
      // Subscribe or resubscribe to a topic
      // You can subscribe to more topics (to control more LEDs in this example)
      client.subscribe("room/lamp");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

// The setup function sets your ESP GPIOs to Outputs, starts the serial communication at a baud rate of 115200
// Sets your mqtt broker and sets the callback function
// The callback function is what receives messages and actually controls the LEDs
void setup() {
  pinMode(lamp, OUTPUT);

  //let's tell BME's I2C adress
  bme.begin(0x76);
  
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);

}

// For this project, you don't need to change anything in the loop function. Basically it ensures that you ESP is connected to your broker
void loop() {

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

  now = millis();
  // Publishes new temperature and humidity every 30 seconds
  if (now - lastMeasure > 30000) {
    lastMeasure = now;
    // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
    float h = bme.readHumidity();
    // Read temperature as Celsius (the default)
    float t = bme.readTemperature();
    // Read temperature as Fahrenheit (isFahrenheit = true)
  //  float f = bme.readTemperature(true);

    // Check if any reads failed and exit early (to try again).
    if (isnan(h) || isnan(t) ) {
      Serial.println("Failed to read from DHT sensor!");
      return;
    }

    // Computes temperature values in Celsius
 //   float hic = bme.computeHeatIndex(t, h, false);
    static char temperatureTemp[7];
  dtostrf(t, 6, 2, temperatureTemp);
    
    // Uncomment to compute temperature values in Fahrenheit 
    // float hif = dht.computeHeatIndex(f, h);
    // static char temperatureTemp[7];
    // dtostrf(hic, 6, 2, temperatureTemp);
    
    static char humidityTemp[7];
    dtostrf(h, 6, 2, humidityTemp);

    // Publishes Temperature and Humidity values
    client.publish("room/temperature", temperatureTemp);
    client.publish("room/humidity", humidityTemp);
    
    Serial.print("Humidity: ");
    Serial.print(h);
    Serial.print(" %\t Temperature: ");
    Serial.print(t);
    Serial.print(" *C ");
   // Serial.print(f);
    Serial.print(" *F\t Heat index: ");
   // Serial.print(hic);
    Serial.println(" *C ");
    // Serial.print(hif);
    // Serial.println(" *F");
  }
}