#include <SoftwareSerial.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

SoftwareSerial mySerial(10, 11); // RX, TX
LiquidCrystal_I2C lcd(0x27, 16, 2);
unsigned long t1, dt;
int stato = 0;




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

mydata dato;

void setup() {

  pinMode(2, OUTPUT);
  lcd.init();
  lcd.backlight();
  mySerial.begin(9600);
  Serial.begin(9600);
  Serial.print(" - ");
  lcd.setCursor(0, 0);
  lcd.print("Hello, world!");
}

byte buff[30];
int i = 0;

void loop() {
   switch (stato) {
    case 0:
      recv();
      break;
    case 1:
      ack();
      break;
  }
}

void recv() {
 dt = millis() - t1;// messo per evitare che sia
  if (dt > 300) {  //fermo in ascolto
    //timeout!
    Serial.println("timeout");
    stato = 1;
  }
  if (mySerial.available()) {
    byte n = mySerial.read();
    // if (n == 'a') {
    if ((char)n == '\n') {
      //mySerial.write((const uint8_t *)&dato, sizeof(struct mydata));
      Serial.println("rx");
      digitalWrite(2, HIGH);
      delay(500);
      digitalWrite(2, LOW);
      stato = 1;
      memcpy(&dato, buff, i);

      Serial.print(dato.cmd); Serial.print(" - ");
      Serial.print(dato.count); Serial.print(" - ");
      Serial.print(dato.temp); Serial.print("\n");
      Serial.print(dato.str); Serial.print("\n");
      Serial.print(dato.st_size); Serial.print("\n");
      Serial.print("ricevuti: ");
      Serial.print(i);
      Serial.println(" bytes - END");
      mySerial.flush();
      if (dato.st_size == i) {
        Serial.println("dati ok ");
        lcd.setCursor(1, 1);
        lcd.print(dato.temp);
        dato.st_size = 0;
      }
      else {
        Serial.println("ERRORE");
        digitalWrite(3, HIGH);
      delay(500);
      digitalWrite(3, LOW);
      lcd.setCursor(1, 1);
        lcd.print("ERRORE");
      }
      i = 0;
    }
    else {
      buff[i] = n;
      i++;
    }
  }
}
//}
void ack() {
  delay(300);
  mySerial.write('k');
  digitalWrite(2, LOW);
  Serial.println("ack");
  mySerial.flush();
  stato = 0;
  t1 = millis();
}


//while (mySerial.available()) {
// byte n = mySerial.read();
//if ((char)n == '\n') {
//  lcd.setCursor(1, 1);
//lcd.print(dato.temp);
//mySerial.write((const uint8_t *)&dato, sizeof(struct mydata));

//memcpy(&dato, buff, i);

// Serial.print(dato.cmd); Serial.print(" - ");
// Serial.print(dato.count); Serial.print(" - ");
//Serial.print(dato.temp); Serial.print("\n");
//Serial.print(dato.str); Serial.print("\n");

//Serial.print("ricevuti: ");
// Serial.print(i);
//Serial.println(" bytes - END");
//i = 0;
//} else {
//buff[i] = n;
//i++;
//}
//}
//mySerial.write((const uint8_t *)&dato, sizeof(struct mydata));
//}