#include <SoftwareSerial.h>



#define SSerialRX        9
#define SSerialTX        8
#define SSerialTxControl 7
#define RS485Transmit    HIGH
#define RS485Receive     LOW

SoftwareSerial RS485Serial(SSerialRX, SSerialTX); // RX, TX

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);


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

byte stato = 0;
unsigned long previousMillis  = 0;
const long interval           = 300;

byte buff[20];
int i = 0;

void setup() {
  lcd.begin();
  lcd.backlight();
  RS485Serial.begin(4800);
  Serial.begin(9600);
  pinMode(SSerialTxControl, OUTPUT);
  digitalWrite(SSerialTxControl, RS485Receive);
}



void loop() {

  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    digitalWrite(SSerialTxControl, RS485Transmit);
    int a = (stato % 3);
    RS485Serial.write( a );  //produce una sequenza: 0, 1, 2
    digitalWrite(SSerialTxControl, RS485Receive);  // Disable RS485 Transmit
    stato++;

  }
  if (RS485Serial.available()) {



    byte n = RS485Serial.read();
    if ((char)n == '\n') {
      Serial.println(n);

      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");

      lcd.setCursor(0, 0);
      lcd.print(dato.cmd); lcd.print(" - ");
      lcd.setCursor(0, 1);
      lcd.print(dato.count); lcd.print(" - ");
      lcd.setCursor(0, 2);
      lcd.print(dato.temp); lcd.print(" - ");
      lcd.setCursor(0, 3);
      lcd.print(dato.str); lcd.print(" - ");

      lcd.setCursor(10, 0);
      lcd.print("ricevuti: ");
      lcd.setCursor(13, 1);
      lcd.print(i);
      lcd.setCursor(10, 2);
      lcd.print("bytes END");
      i = 0;
    } else {
      buff[i] = n;
      i++;
    }
  }
}