Lesen eines DHT11 und schreiben in eine MySQL DB

#include <ESP8266WiFi.h>
#include <dht11.h>
#include <MySQL_Connection.h>
#include <MySQL_Cursor.h>

const char* ssid = "WLAN_Name";  // Enter SSID here
const char* password = "WLAN_Password";  //Enter Password here

IPAddress server_addr(192,168,178,27);  // IP of the MySQL *server* here
char* user = "DB_user";              // MySQL user login username
char* dbPassword = "DB_Pass";        // MySQL user login password

WiFiClient client;                 // Use this for WiFi instead of EthernetClient
MySQL_Connection conn(&client);
MySQL_Cursor* cursor;

// Das Insert Statement
char INSERT_SQL[] = "insert into home.feuchte(ip,sensor,temperatur,feuchte) values('%s', %d, %d,%d)";
char query[128];
char temperature[10];
char feuchte[10];

dht11 DHT11;

void setup() {
    DHT11.attach(2);
    Serial.begin(115200);
    delay(10);

    // Begin WiFi section
      Serial.printf("\nConnecting to %s", ssid);
      WiFi.begin(ssid, password);
      while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
      }

      // print out info about the connection:
      Serial.println("\nConnected to network");
      Serial.print("My IP address is: ");
      Serial.println(WiFi.localIP());

      Serial.print("Connecting to SQL...  ");
        if (conn.connect(server_addr, 3306, user, dbPassword))
          Serial.println("OK.");
        else
          Serial.println("FAILED.");

        // create MySQL cursor object
        cursor = new MySQL_Cursor(&conn);
}


void connectWiFI(){
    // Begin WiFi section
          Serial.printf("\nConnecting to %s", ssid);
          WiFi.begin(ssid, password);
          while (WiFi.status() != WL_CONNECTED) {
            delay(500);
            Serial.print(".");
          }

          // print out info about the connection:
          Serial.println("\nConnected to network");
          Serial.print("My IP address is: ");
          Serial.println(WiFi.localIP());
}


void connectMysql(){
     Serial.print("Connecting to SQL...  ");
            if (conn.connect(server_addr, 3306, user, dbPassword))
              Serial.println("OK.");
            else
              Serial.println("FAILED.");

            // create MySQL cursor object
            cursor = new MySQL_Cursor(&conn);
}


void loop() {
// Besteht eine WLAN Verbindung
    if (WiFi.status() != WL_CONNECTED){
        connectWiFI();
    } else{
// Besteht eine Verbindung zur Datenbank
        if (! conn.connected()){
            connectMysql();
        }else{
          Serial.println("\n");
// Sensor lesen
          int chk = DHT11.read();
          Serial.print("Read sensor: ");
          switch (chk)
          {
            case 0: Serial.println("OK"); break;
            case -1: Serial.println("Checksum error"); break;
            case -2: Serial.println("Time out error"); break;
            default: Serial.println("Unknown error"); break;
          }

          IPAddress ip = WiFi.localIP();
          char buf[16];
          sprintf(buf, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);

          sprintf(query, INSERT_SQL, buf, 1, DHT11.temperature,DHT11.humidity);

          //sprintf(query, INSERT_SQL, "addr", 1, temperature,feuchte);

          //Serial.println(temperature);
          //Serial.println(feuchte);
          Serial.println(query);
          Serial.println("writing...");
          if (conn.connected()){
              cursor->execute(query);
          }
        }
    }
delay(60000); //delay for reread
}