Domoticz ESP8266 Arduino DS18B20

#include <stdlib.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#define ONE_WIRE_BUS 8
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

#define SSID "SSID" //SSID of your wireless network
#define PASS "PASSWORD" //Password of your wireless network
#define IP "192.168.4.15" // Domoticz IP, be sure to also change on line #65! (Host: x.x.x.x)
String GET = "GET /json.htm?type=command&param=udevice&idx=109&nvalue=0&svalue=";

long previousMillis = 0;        // will store last time loop was executed

// the follow variables is a long because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.
long interval = 300000;           // Interval for updating sensors (millisec), 300000 = 5 min = Domoticz virtual sensor interval

void setup()
{
  Serial.begin(9600);
  sensors.begin();
  Serial.println("AT");
  delay(5000);
  if(Serial.find("OK")){
    connectWiFi();
  }
}

void loop(){
  unsigned long currentMillis = millis();

  if(currentMillis - previousMillis > interval) {
    // save the last time you executed the actions
    previousMillis = currentMillis;

    // Perform actions
    sensors.requestTemperatures();
    float tempC = sensors.getTempCByIndex(0);
    //tempC = DallasTemperature::toFahrenheit(tempC);
    char buffer[10];
    String tempF = dtostrf(tempC, 4, 1, buffer);
    updateTemp(tempF);

  }
}


void updateTemp(String tempF){
  String cmd = "AT+CIPSTART=\"TCP\",\"";
  cmd += IP;
  cmd += "\",8080";
  Serial.println(cmd);
  delay(2000);
  if(Serial.find("Error")){
    return;
  }
  cmd = GET;
  cmd += tempF;
  cmd += " HTTP/1.1\r\n";  //construct http GET request
  cmd += "Host: 192.168.4.15\r\n\r\n"; //Change this IP to the IP-adress of your Domoticz
  Serial.print("AT+CIPSEND=");
  Serial.println(cmd.length());
  if(Serial.find(">")){
    Serial.print(cmd);
  }else{
    Serial.println("AT+CIPCLOSE");
  }
}


boolean connectWiFi(){
  Serial.println("AT+CWMODE=1");
  delay(2000);
  String cmd="AT+CWJAP=\"";
  cmd+=SSID;
  cmd+="\",\"";
  cmd+=PASS;
  cmd+="\"";
  Serial.println(cmd);
  delay(5000);
  if(Serial.find("OK")){
    return true;
  }else{
    return false;
  }
}