#define LED_PIN 2 // GPIO2
...
pinMode(LED_PIN, OUTPUT);
digitalWrite(LED_PIN, HIGH);

Serial.begin(9600);
Serial.println("Hello Sming! Let's do smart things.");

WifiStation.enable(true);
WifiStation.config("LOCAL-NETWORK", "123456789087"); // Put you SSID and Password here

#include <Libraries/DHT/DHT.h> // This is just popular Arduino library!

#define WORK_PIN 0 // GPIO0
DHT dht(WORK_PIN, DHT22);

void init()
{
  dht.begin();

  float h = dht.readHumidity();
  float t = dht.readTemperature();
}

HttpClient thingSpeak;
...
thingSpeak.downloadString("http://api.thingspeak.com/update?key=XXXXXXX&field1=" + String(sensorValue), onDataSent);

void onDataSent(HttpClient& client, bool successful)
{
  if (successful)
    Serial.println("Successful!");
  else
    Serial.println("Failed");
}

void OtaUpdate() {
	
	uint8 slot;
	rboot_config bootconf;
	
	Serial.println("Updating...");
	
	// need a clean object, otherwise if run before and failed will not run again
	if (otaUpdater) delete otaUpdater;
	otaUpdater = new rBootHttpUpdate();
	
	// select rom slot to flash
	bootconf = rboot_get_config();
	slot = bootconf.current_rom;
	if (slot == 0) slot = 1; else slot = 0;

	// flash rom to position indicated in the rBoot config rom table
	otaUpdater->addItem(bootconf.roms[slot], ROM_0_URL);

	// and/or set a callback (called on failure or success without switching requested)
	otaUpdater->setCallback(OtaUpdate_CallBack);

	// start update
	otaUpdater->start();
}

server.listen(80);
server.addPath("/", onIndex);
server.addPath("/hello", onHello);
server.setDefaultHandler(onFile);

Serial.println("=== WEB SERVER STARTED ===");
Serial.println(WifiStation.getIP());

...

void onIndex(HttpRequest &request, HttpResponse &response)
{
  TemplateFileStream *tmpl = new TemplateFileStream("index.html");
  auto &vars = tmpl->variables();
  vars["counter"] = String(counter);
  vars["IP"] = WifiStation.getIP().toString();
  vars["MAC"] = WifiStation.getMAC();
  response.sendTemplate(tmpl);
}

void onFile(HttpRequest &request, HttpResponse &response)
{
  String file = request.getPath();
  if (file[0] == '/')
    file = file.substring(1);
    
  response.setCache(86400, true);
  response.sendFile(file);
}