#include <OneWire.h>
#include <DallasTemperature.h>
#include <SoftwareSerial.h>

#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
SoftwareSerial mySerial(10, 11); // RX, TX

unsigned long t1, dt;
int stato = 0;

struct mydata {
  char cmd;
  int count;
  float temp;
  char str[20];
int st_size ;
};

mydata dato = {'x', 0, 18.0f, "hello world!",0};

void setup() {
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  Serial.println("trasmettitore");
  Serial.begin(9600);
  mySerial.begin(9600);
  digitalWrite(13, LOW);
  sensors.begin();
}

void loop() {
 Serial.print(".");
 sensors.requestTemperatures();
  dato.temp = sensors.getTempCByIndex(0);
  //Serial.println (sensors.getTempCByIndex(0));

  switch (stato) {
    case 0:
      tx();
      break;
    case 1:
      ack();
      break;
    case 2:
      timeout();
      break;
  }
}
void tx() {
dato.st_size = sizeof(struct mydata);
  Serial.print("millis "); Serial.println(millis()/100 );
  Serial.println("TX");
 mySerial.write((byte)'\n');
  mySerial.write((const uint8_t *)&dato, sizeof(struct mydata));

  dato.count++;
  digitalWrite(13, HIGH);
  stato = 1;
  t1 = millis();
}
bool FIRST = true;

void ack() {
  if (FIRST) {
    Serial.println("RX...");
    FIRST = false;
  }
  if (mySerial.available()) {
    byte c = mySerial.read();
    if (c == 'k') {
      Serial.println("ACK");
      mySerial.flush();
      digitalWrite(13, LOW);
      delay(500);
      stato = 0;
    }
  }
  dt = millis() - t1;
  if (dt > 5000) {
    //timeout!
    Serial.println("timeout");
    stato = 2;
  }
}
void timeout() {
  digitalWrite(13, LOW);
  digitalWrite(12, HIGH);
  stato = 0;
  delay(3000);
  digitalWrite(12, LOW);
}
//sensors.requestTemperatures();
//dato.temp = sensors.getTempCByIndex(0);
//Serial.println (sensors.getTempCByIndex(0));
//mySerial.write((const uint8_t *)&dato, sizeof(struct mydata));
//mySerial.write((byte)'\n');
//dato.count++;
//delay(1000);
//}