Temperatur und Luftfeuchtigkeit messen mit ESP8266

/* 
 Read temperature and humidity from a DHT22 sensor with ESP8266 and send via HTTP to a Server
 Copyright: Martin Janßen, janssen@steinhude-am-meer.de
 February 2017
*/
    #include <ESP8266WiFi.h>
    #include <WiFiClient.h>
    #include <ESP8266WebServer.h>
    #include <DHT.h>
    #include <ESP8266mDNS.h>
    #include <SPI.h>
    #define DHTTYPE DHT22
    #define DHTPIN  2
    /* Parameter */ 
    const char* ssid     = "YOURWLANSSID"; // WLAN SSID
    const char* password = "YOURWLANPASSWORD"; // WLAN Passwort
    const int pause = 300; // Wartezeit zwischen Wertuebermittlungen in Sekunden
    const char server

					

						[] = "192.168.1.10"; // Webserver
    const int sensors_id_Temp = 11; // sensors_id Temperatur in Smarthome APP
    const int sensors_id_Hum = 12; // sensors_id Luftfeuchtigkeit  in Smarthome APP
    /* initialize WifiClient */
    int status = WL_IDLE_STATUS; 
    WiFiClient client;
    // Initialize DHT sensor 
    DHT dht(DHTPIN, DHTTYPE, 11); // 11 works fine for ESP8266
    // Werte als Pointer definieren, damit sie global lesbar werden
    float DHThumidity;
    float DHTtemperature; 
    float humidity, temp_f;  // Values read from sensor
    // Generally, you should use "unsigned long" for variables that hold time
    unsigned long previousMillis = 0;        // will store last temp was read
    const long interval = 2000;              // interval at which to read sensor

    /* SETUP -> wird beim Start ausgefuehrt*/ 
    void setup(void)
    {
      Serial.begin(115200);  // Seriellen Monitor starten mit 115200 Baud
      Serial.println ("\n\rStarte...");
      connectWLAN();
      // Temperatur und Luftfeuchtigkeit vom DHT 22 holen
      dht.begin();           // initialize temperature sensor
      getValues(&DHThumidity, &DHTtemperature); // Pointer-Werte übergeben
      send2smarthome(&DHThumidity, &DHTtemperature);
      // Schlafen legen
      Serial.println("ESP8266 geht schlafen");
      ESP.deepSleep(pause * 1000000);
    }
    /* LOOP -> wird zur Laufzeit wiederholt, will man wegen shutdown nicht erreichen */ 
    void loop(void)
    {
    } 
    /* FUNCTIONS werden hier definiert */
    // function WLAN aufbauen
    void connectWLAN(){
      // Connect to WiFi network
      WiFi.begin(ssid, password);
      Serial.println("\n\rWLAN-Verbindung aufbauen");
     
      // Wait for connection
      while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
      }
      printWifiStatus();
      delay(500);
    } 
    // function WLAN Status ausgeben
    void printWifiStatus() {
      //Ausgabe des WLan Netzwerks
      Serial.print("\n\rSSID: ");
      Serial.println(WiFi.SSID());
    
      //Ausgabe IP Adresse
      IPAddress ip = WiFi.localIP();
      Serial.print("IP Address: ");
      Serial.println(ip);
    }
    // function Messdaten an Smarthome senden
    void send2smarthome(float* DHThumidity, float* DHTtemperature){
      // Serial.print("Hum ");
      // Serial.println(*DHThumidity);
      // Serial.print("Temp ");
      // Serial.println(*DHTtemperature);
      Serial.println("Daten an Smarthome senden");
      String urlpath = String("/smarthome/?a=set_sensor&");
      urlpath += sensors_id_Temp; // sensors_id Temperatur ESP
      urlpath += "=";
      urlpath += *DHTtemperature;
      urlpath += "&";
      urlpath += sensors_id_Hum; // sensors_id Luftfeuchtigkeit ESP
      urlpath += "=";
      urlpath += *DHThumidity;
      Serial.println(urlpath);
      WiFiClient client;
      if (client.connect(server, 80)) {
        // Ausgabe an seriellen Monitor
        Serial.print("Verbunden mit Smarthome-Server ");
        Serial.println(server);
        //Verbindung mit Server aufbauen und HTTP Anfrage senden
        client.print("GET ");
        client.print(urlpath);
        client.println(" HTTP/1.1");
        client.print("Host: ");
        client.println(server); //Adresse des Webservers
        client.println("Connection: close");
        client.println();  //Verbindung mit Server aufbauen und HTTP Anfrage senden
      }
    }
    // NEU function Temperatur und Luftfeuchtigkeit vom DSP22 holen
    void getValues(float* DHThumidity, float* DHTtemperature){
      // Wait at least 2 seconds seconds between measurements.
      // if the difference between the current time and last time you read
      // the sensor is bigger than the interval you set, read the sensor
      // Works better than delay for things happening elsewhere also
      unsigned long currentMillis = millis();
     
      if(currentMillis - previousMillis >= interval) {
        // save the last time you read the sensor 
        previousMillis = currentMillis;   
     
        // Reading temperature for humidity takes about 250 milliseconds!
        // Sensor readings may also be up to 2 seconds 'old' (it's a very slow sensor)
        Serial.println("DHT auslesen");
        *DHThumidity = dht.readHumidity();  
        *DHTtemperature = dht.readTemperature();
        // Check if any reads failed and exit early (to try again).
        if (isnan(humidity) || isnan(temp_f)) {
          Serial.println("Failed to read from DHT sensor!");
          // return 0;
        }
        // return temp_f;
        Serial.print("Hum ");
        Serial.println(*DHThumidity);
        Serial.print("Temp ");
        Serial.println(*DHTtemperature);
      }
    }