void connectAWS()
{
  // Configure WiFiClientSecure to use the AWS IoT device credentials
  net.setCACert(AWS_CERT_CA);
  net.setCertificate(AWS_CERT_CRT);
  net.setPrivateKey(AWS_CERT_PRIVATE);

  // Connect to the MQTT broker on the AWS endpoint we defined earlier
  client.begin(AWS_IOT_ENDPOINT, 8883, net);
  client.onMessage(messageHandler);
  Serial.print("Connecting to AWS IOT");

  while (!client.connect(THINGNAME)) {
    Serial.print(".");
    delay(100);
  }

  if (!client.connected()) {
    Serial.println("AWS IoT Timeout!");
    return;
  }
  // Subscribe to a topic
  client.subscribe("control/lamp");
  // Create a message handler

  Serial.println("AWS IoT Connected!");
}

void messageHandler(String &topic, String &payload) {
  Serial.println("receiving MQTT message");
  Serial.println("incoming: " + topic + " - " + payload);
  int i = payload.toInt();
  digitalWrite(IO_RELAY,i);
}