Sming

#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/DHTesp/DHTesp.h> // This is just a popular Arduino library!

#define DHT_PIN 0 // GPIO0
DHTesp dht;

void init()
{
  dht.setup(DHT_PIN, DHTesp::DHT22);

  float h = dht.getHumidity();
  float t = dht.getTemperature();
}

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);
}

SmtpClient emailClient;

emailClient.connect(URL("smtp://user:password@domain.com:25"));

MailMessage* mail = new MailMessage();
mail->from = "developers@sming";
mail->to = "iot-developers@world";
mail->subject = "Greetings from Sming";
mail->setBody("Hello");

FileStream* file= new FileStream("image.png");
mail->addAttachment(file);

emailClient.onMessageSent(onMailSent);
emailClient.send(mail);

...

int onMailSent(SmtpClient& client, int code, char* status)
{
    MailMessage* mail = client.getCurrentMessage();

    ...

    if(!client.countPending()) {
        client.quit();
    }

    return 0;
}