esp dht thingspaek

#include <ESP8266WiFi.h>
#include "DHT.h"

#define AP_SSID     "ssid"
#define AP_PASSWORD "xxxxxx"

const int sleepTimeS = 10*60; // v minutách

#define API_KEY "xxxx"


#define THINGSPEAK_CLOUD_ADDRESS     "api.thingspeak.com"
#define THINGSPEAK_CLOUD_PORT        80

#define DHTPIN 2 // DHT22 pin
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

float oldTemp;
float oldHum;

void setup() {
  Serial.begin(115200);
  wifiConnect();

  dht.begin();

  oldTemp = -1;
  oldHum = -1;
}

void loop() {
  Serial.println("Start");
  delay(2000);

  float hum = dht.readHumidity();
  float temp = dht.readTemperature();

  if (isnan(hum) || isnan(temp) ) {
    Serial.println("Failed to read from DHT sensor!");
   // return;
  }
  Serial.println();
  Serial.println("**********************************************");
  Serial.println("Humidity (%)\tTemperature (C)");

  Serial.print("\t");
  Serial.print(hum, 1);
  Serial.print("\t\t");
  Serial.print(temp, 1);
  Serial.println("\t\t");

  Serial.println("**********************************************");
  Serial.println();

  sendhodnoty(hum, temp);


  Serial.println("Jdu spat");
  delay(100);
  ESP.deepSleep(sleepTimeS * 1000000);
  delay(100);
}

void wifiConnect()
{
  Serial.print("Connecting to AP");
  WiFi.begin(AP_SSID, AP_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
}

void sendhodnoty(float hum, float temp)
{
  WiFiClient client;

  while (!client.connect(THINGSPEAK_CLOUD_ADDRESS, THINGSPEAK_CLOUD_PORT)) {
    Serial.println("connection failed");
    wifiConnect();
  }

  String url = "";

  url += "/update?api_key=" + String(API_KEY) + "&field1=" + String(hum) + "&field2=" + String(temp);

  Serial.print("POST data to URL: ");
  Serial.println(url);

  client.print(String("POST ") + url + " HTTP/1.1\r\n" +
               "Host: " + String(THINGSPEAK_CLOUD_ADDRESS) + "\r\n" +
               "Connection: close\r\n" +
               "Content-Length: 0\r\n" +
               "\r\n");

  delay(100);
  while (client.available()) {
    String line = client.readStringUntil('\r');
    Serial.print(line);
  }

  Serial.println();
  Serial.println("Connection closed");
}