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

#define MQTT_VERSION MQTT_VERSION_3_1_1
#define DHTPIN 13
#define DHTTYPE DHT11

const char* WIFI_SSID = "Drueck mich!";
const char* WIFI_PASSWORD = "Key01@BM";
const PROGMEM char* MQTT_CLIENT_ID = "bedroom_dht11";
const PROGMEM char* MQTT_SERVER_IP = "";
const PROGMEM uint16_t MQTT_SERVER_PORT = 1883;
const PROGMEM char* MQTT_USER = "";
const PROGMEM char* MQTT_PASSWORD = "";
const PROGMEM char* MQTT_SENSOR_TOPIC = "/house/bedroom/sensor_dht";
const PROGMEM uint16_t SLEEPING_TIME_IN_SECONDS = 30;

DHT dht(DHTPIN, DHTTYPE);
WiFiClient wifiClient;
PubSubClient client(wifiClient);

void publishData(float p_temperature, float p_humidity) {
  StaticJsonBuffer<200> jsonBuffer;
  JsonObject& root = jsonBuffer.createObject();

  root["temperature"] = (String)p_temperature;
  root["humidity"] = (String)p_humidity;

  root.prettyPrintTo(Serial);
  Serial.println("");

  char data[200];
  root.printTo(data, root.measureLength() + 1);
  client.publish(MQTT_SENSOR_TOPIC, data, true);
}

// function called when a MQTT message arrived
void callback(char* p_topic, byte* p_payload, unsigned int p_length) {
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("INFO: Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect(MQTT_CLIENT_ID, MQTT_USER, MQTT_PASSWORD)) {
      Serial.println("INFO: connected");
    } else {
      Serial.print("ERROR: failed, rc=");
      Serial.print(client.state());
      Serial.println("DEBUG: try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void setup() {
  // init the serial
  Serial.begin(9600);

  dht.begin();

  // init the WiFi connection
  Serial.println();
  Serial.println();
  Serial.print("INFO: Connecting to ");
  WiFi.mode(WIFI_STA);
  Serial.println(WIFI_SSID);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("INFO: WiFi connected");
  Serial.println("INFO: IP address: ");
  Serial.println(WiFi.localIP());

  // init the MQTT connection
  client.setServer(MQTT_SERVER_IP, MQTT_SERVER_PORT);
  client.setCallback(callback);
}

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

  float h = dht.readHumidity();
  float t = dht.readTemperature();

  if (isnan(h) || isnan(t)) {
    Serial.println("ERROR: Failed to read from DHT sensor!");
    return;
  } else {
    //Serial.println(h);
    //Serial.println(t);
    publishData(t, h);
  }

  Serial.println("INFO: Closing the MQTT connection");
  client.disconnect();

  Serial.println("INFO: Closing the Wifi connection");
  WiFi.disconnect();

  ESP.deepSleep(SLEEPING_TIME_IN_SECONDS, WAKE_RF_DEFAULT);
  delay(500); // wait for deep sleep to happen
}