//nice  Code generated by Arduino IoT Cloud
#include <ArduinoIoTCloud.h>
#include <Arduino_ConnectionHandler.h>
const char DEVICE_LOGIN_NAME[]  = "61b1d96c-61f3-4be7-acc0-0cd15ac9ac5f";
const char SSID[]               = "Wokwi-GUEST";    
const char PASS[]               = "";    
const char DEVICE_KEY[]         = "MOwWVtkCCIc0Gegrw6ZfAtzzW";   
bool button;
bool led;
CloudSwitch switch1;
CloudSwitch switch2;
 int LED1=19;
 int LED2=18;
void initProperties() {
  ArduinoCloud.setBoardId(DEVICE_LOGIN_NAME);
  ArduinoCloud.setSecretDeviceKey(DEVICE_KEY);
  ArduinoCloud.addProperty(button, READWRITE, ON_CHANGE, onButtonChange);
  ArduinoCloud.addProperty(led, READ, ON_CHANGE, NULL);
  ArduinoCloud.addProperty(switch1, READWRITE, ON_CHANGE, onSwitch1Change);
  ArduinoCloud.addProperty(switch2, READWRITE, ON_CHANGE, onSwitch2Change);
}
WiFiConnectionHandler ArduinoIoTPreferredConnection(SSID, PASS);
void setup() {
  Serial.begin(9600);
  delay(1500);
  initProperties();
  ArduinoCloud.begin(ArduinoIoTPreferredConnection);
  setDebugMessageLevel(2);
  ArduinoCloud.printDebugInfo();
  pinMode(26, INPUT_PULLUP);
  pinMode(25, OUTPUT);
  pinMode(19, OUTPUT);
  pinMode(18, OUTPUT);
}
void loop() {
  ArduinoCloud.update();
  if (!digitalRead(26)) led = true;
  else led = false;
}
void onButtonChange()  {
  if (button) digitalWrite(25, HIGH);
  else digitalWrite(25, LOW);
}
void onSwitch2Change() {
  digitalWrite(LED2, switch2);
}
void onSwitch1Change() {
  digitalWrite(LED1, switch1);
}

#include <HardwareSerial.h>
#include <ModbusMaster.h>

// Pin definitions
#define MAX485_DE      5
#define PUSH_BUTTON    4

// Modbus slave ID (change to match your PLC)
#define SLAVE_ID       1

// Instantiate ModbusMaster object
ModbusMaster node;

// Button state tracking
bool lastButtonState = HIGH;
bool currentButtonState = HIGH;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;

void setup() {
  pinMode(MAX485_DE, OUTPUT);
  pinMode(PUSH_BUTTON, INPUT_PULLUP);
  
  // Init in receive mode
  digitalWrite(MAX485_DE, LOW);
  
  // Serial1 for Modbus (adjust pins if needed)
  Serial1.begin(9600, SERIAL_8N1, 16, 17);
  
  // Initialize Modbus communication
  node.begin(SLAVE_ID, Serial1);
  
  // Callbacks for RS485 transceiver control
  node.preTransmission(preTransmission);
  node.postTransmission(postTransmission);
  
  Serial.begin(115200);
  Serial.println("ESP32 Modbus RTU Master Ready");
}

void loop() {
  // Read the button with debounce
  int reading = digitalRead(PUSH_BUTTON);
  
  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }
  
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != currentButtonState) {
      currentButtonState = reading;
      
      if (currentButtonState == LOW) {
        // Button pressed - toggle M0 coil
        togglePLCcoil();
      }
    }
  }
  
  lastButtonState = reading;
}

void togglePLCcoil() {
  Serial.println("Button pressed - toggling M0");
  
  // Read current state of M0 (coil address 0)
  uint8_t result = node.readCoils(0, 1);
  
  if (result == node.ku8MBSuccess) {
    bool currentState = node.getResponseBuffer(0);
    
    // Write opposite state
    result = node.writeSingleCoil(0, !currentState);
    
    if (result == node.ku8MBSuccess) {
      Serial.print("M0 set to: ");
      Serial.println(!currentState ? "ON" : "OFF");
    } else {
      Serial.print("Failed to write coil, error: ");
      Serial.println(result, HEX);
    }
  } else {
    Serial.print("Failed to read coil, error: ");
    Serial.println(result, HEX);
  }
}

// RS485 control functions
void preTransmission() {
  digitalWrite(MAX485_DE, HIGH);
}

void postTransmission() {
  digitalWrite(MAX485_DE, LOW);
}

#include <ModbusMaster.h>

#define MAX485_DE_RE 2
#define BUTTON_PIN 4

ModbusMaster node;

void preTransmission() {
  digitalWrite(MAX485_DE_RE, 1);
}

void postTransmission() {
  digitalWrite(MAX485_DE_RE, 0);
}

void setup() {
  pinMode(MAX485_DE_RE, OUTPUT);
  digitalWrite(MAX485_DE_RE, 0);

  pinMode(BUTTON_PIN, INPUT_PULLUP);  // Active LOW button

  Serial.begin(115200);
  Serial1.begin(9600, SERIAL_8N1, 16, 17); // RS485 on UART1

  node.begin(1, Serial1); // Slave ID 1
  node.preTransmission(preTransmission);
  node.postTransmission(postTransmission);
}

void loop() {
  static bool lastButtonState = HIGH;
  bool buttonState = digitalRead(BUTTON_PIN);

  if (buttonState == LOW && lastButtonState == HIGH) {
    // Button Pressed
    uint8_t result = node.writeSingleCoil(0x0001, 0xFF00); // Turn ON
    Serial.print("Write Coil Result: ");
    Serial.println(result, HEX);
    delay(500); // Debounce
  }
  lastButtonState = buttonState;
}