MQTT BME280

#include <Wire.h>
#include <SPI.h>
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>

#define BME_SCK 13
#define BME_MISO 12
#define BME_MOSI 11
#define BME_CS 10

const float cToKOffset = 273.15;

Adafruit_BME280 bme; // I2C

WiFiClient espClient;
PubSubClient client(espClient);

String zimmer = "Sebastian Zimmer";

const char* ssid = "Dev-Network";
const char* password = "----";
const char* mqtt_server = "192.168.1.109";
const char* mqtt_user = "mqtt";
const char* mqtt_pass = "mqtt";
const char* mqtt_root = "/Zimmer/Sebastians Zimmer";

String tversion = "1.0";
#define ALTITUDE 164 //Höhe über dem Meer

#define CONFIG_MQTT_TOPIC_GET "/get"
#define CONFIG_MQTT_TOPIC_GET_TEMP "/temperature"
#define CONFIG_MQTT_TOPIC_GET_DEW "/dewpoint"
#define CONFIG_MQTT_TOPIC_GET_HUM "/humidity_abs"
#define CONFIG_MQTT_TOPIC_GET_HUMR "/humidity"
#define CONFIG_MQTT_TOPIC_GET_PRES "/pressure"
#define CONFIG_MQTT_TOPIC_GET_PRESR "/pressure_rel"

class PubSubClientWrapper : public PubSubClient{
  private:
  public:
    PubSubClientWrapper(Client& espc);
    bool publish(StringSumHelper topic, String str);
    bool publish(StringSumHelper topic, unsigned int num);
    bool publish(const char* topic, String str);
    bool publish(const char* topic, unsigned int num);

    bool publish(StringSumHelper topic, String str, bool retain);
    bool publish(StringSumHelper topic, unsigned int num, bool retain);
    bool publish(const char* topic, String str, bool retain);
    bool publish(const char* topic, unsigned int num, bool retain);
};

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.setTimeout(20);

    // Wait for serial to initialize.
  while(!Serial) {
    delay(1);
  }

  Serial.println("Device started!");
  Serial.println("----------------------------------------");
  Serial.print("Temperatur Messung ");
  Serial.println(tversion);
  Serial.print("MQTT: ");
  Serial.println(mqtt_root);
  Serial.println("----------------------------------------");
  Serial.println();

  Serial.print("Verbinde Wlan");
  WiFi.begin(ssid, password);
  int t = 12;
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    if ((t % 29) == 0) {
      Serial.println();
    }
    Serial.print(".");
    t = t + 1;

    if(t == 150) {
      Serial.println();
      Serial.print("Wlan nicht verfügbar. Erneuter Versuch in 5 min");
      ESP.deepSleep(300e6);
    }
  }

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

  Serial.println();
  client.setServer(mqtt_server, 1883);
  Serial.print("Attempting MQTT connection");
  String clientId = "ESP-";
  clientId += zimmer;
  if (client.connect(clientId.c_str(), mqtt_user, mqtt_pass)) {
    Serial.println("connected");
  }

  bool status;

  // default settings
  // (you can also pass in a Wire library object like &Wire2)
  status = bme.begin(0x76);
  if (!status) {
      Serial.println("Could not find a valid BME280 sensor, check wiring!");
      while (1);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  float temperature = bme.readTemperature();
  float humidity_r = bme.readHumidity();
  float humidity = absoluteHumidity(temperature, humidity_r);
  float pressure_r = bme.readPressure() / 100.0F;
  float pressure = bme.seaLevelForAltitude(ALTITUDE, pressure_r);

  client.publish(((String)mqtt_root + CONFIG_MQTT_TOPIC_GET + CONFIG_MQTT_TOPIC_GET_TEMP), (String)temperature);
  client.publish(((String)mqtt_root + CONFIG_MQTT_TOPIC_GET + CONFIG_MQTT_TOPIC_GET_DEW), (String)dew);
  client.publish(((String)mqtt_root + CONFIG_MQTT_TOPIC_GET + CONFIG_MQTT_TOPIC_GET_HUM), (String)humidity);
  client.publish(((String)mqtt_root + CONFIG_MQTT_TOPIC_GET + CONFIG_MQTT_TOPIC_GET_HUMR), (String)humidity_r);
  client.publish(((String)mqtt_root + CONFIG_MQTT_TOPIC_GET + CONFIG_MQTT_TOPIC_GET_PRES), (String)pressure);
  client.publish(((String)mqtt_root + CONFIG_MQTT_TOPIC_GET + CONFIG_MQTT_TOPIC_GET_PRESR), (String)pressure_r);


  Serial.println();
  ESP.deepSleep(30e6);
}

// Relative to absolute humidity
// Based on https://carnotcycle.wordpress.com/2012/08/04/how-to-convert-relative-humidity-to-absolute-humidity/
float absoluteHumidity(float temperature, float humidity) {
  return (13.2471*pow(EULER,17.67*temperature/(temperature+243.5))*humidity/(cToKOffset+temperature));
}