int DE_Pin = 4;
int RE_Pin = 5;
int IRQ_Pin = 1;
char receivedMessage[64];
int receivedMessageIndex = 0;

void send_data(const String data, const String answer) {
  data.replace("\r", "");
  data.replace("\n", "");
  Serial.println(data + answer);
}

void handleIRQ() {
  detachInterrupt(digitalPinToInterrupt(irqPin));
  send_data("#7V","message")
  attachInterrupt(digitalPinToInterrupt(irqPin), handleIRQ, RISING);
}

void get_message() {
  while (Serial.available()) {
    char receivedChar = Serial.read();
    if (receivedChar == '\n') {
      receivedMessage[receivedMessageIndex] = '\0'; // Null-terminate the string
      receivedMessageIndex = 0;
      if (strstr(receivedMessage, "#7V") != NULL) {
        send_data(receivedMessage, " ARDU_RS485_07-09-2023");
      } else {
        send_data(receivedMessage, "?");
      }
    } else {
      receivedMessage[receivedMessageIndex++] = receivedChar;
    }
  }
}

void setup() {
  pinMode(DE_Pin, OUTPUT);
  pinMode(RE_Pin, OUTPUT);
  digitalWrite(DE_Pin, 0);
  digitalWrite(RE_Pin, 1);
  Serial.println("Begin"); 
  attachInterrupt(digitalPinToInterrupt(irqPin), handleIRQ, RISING);
}

void loop() {
  get_message();
}