#include <Wire.h>
#include <DHT.h>
#include <DHT_U.h>
#define DHTPIN 2
#define DHTTYPE DHT11
DHT_Unified dht(DHTPIN, DHTTYPE);

#define sigfox Serial1

int tem;
int hum;

void setup() {
  Serial.begin(9600);
  sigfox.begin(9600);
  dht.begin();
  sensor_t sensor;
  pinMode(13, OUTPUT);
  }

void loop() {
  while (Serial.available()) {
    char c = Serial.read();
    if (c == '1') {
      if (sendMessage()) {
        Serial.println("Message sent successfully!");
      }
      else {
        Serial.println("The message was not sent!");
      }
    }
  }

  sensors_event_t event;  
  dht.temperature().getEvent(&event);
  tem = 100 * event.temperature;
  dht.humidity().getEvent(&event);
  hum = event.relative_humidity;
  
  Serial.println(tem);
  Serial.println(hum);
  delay(2000);
}

bool sendMessage() {
  bool retval = false;
  digitalWrite(13, HIGH);
  uint8_t message[4];
  long start = millis();
  char hexBajt[3];

  memcpy(&message[0], &tem, 2);
  memcpy(&message[2], &hum, 2);
  
  Serial.println("Sending message...");
  sigfox.print("AT$SF=");
  for (int i = 0; i < sizeof(message); i++) {
    sprintf(hexBajt, "%02X", message[i]);
    sigfox.print(hexBajt); 
    }
  sigfox.print("\r");
  while (!sigfox.available()) {
    if ((millis() - start) > 30000) {
      digitalWrite(13, LOW);
      return false;
    }
  }
  while (sigfox.available()) {
    digitalWrite(13, LOW);
    char answer = sigfox.read();
    if (answer == 'O') retval = true;
  }
  return retval;
}