#include <ArduinoBLE.h>

const int solenoidPin = 2; // Replace with actual Arduino pin connected to the solenoid control transistor
bool isPaused = true; // Start with the solenoid paused

BLEService solenoidService("12345678-1234-1234-1234-123456789ABC"); // Custom UUID for the service
BLEStringCharacteristic commandCharacteristic("87654321-4321-4321-4321-210987654321", BLERead | BLEWrite, 20); // Custom UUID for the characteristic

void setup() {
  pinMode(solenoidPin, OUTPUT);
  Serial.begin(9600);
  if (!BLE.begin()) {
    Serial.println("starting BLE failed!");
    while (1);
  }

  BLE.setLocalName("SolenoidControl");
  BLE.setAdvertisedService(solenoidService);
  solenoidService.addCharacteristic(commandCharacteristic);
  BLE.addService(solenoidService);
  commandCharacteristic.writeValue("Paused"); // Initial value
  BLE.advertise();

  Serial.println("Bluetooth device active, waiting for connections...");
}

void loop() {
  BLEDevice central = BLE.central();

  if (central) {
    Serial.print("Connected to central: ");
    Serial.println(central.address());
    
    while (central.connected()) {
      if (commandCharacteristic.written()) {
        String command = commandCharacteristic.value();
        if (command == "Start") {
          isPaused = false;
          Serial.println("Solenoid started");
        } else if (command == "Pause") {
          isPaused = true;
          Serial.println("Solenoid paused");
        }
      }

      if (!isPaused) {
        digitalWrite(solenoidPin, HIGH); // Activate solenoid
        delay(1000); // Keep solenoid activated for 1 second
        digitalWrite(solenoidPin, LOW); // Deactivate solenoid
        delay(1000); // Keep solenoid deactivated for 1 second
      }
    }

    Serial.print("Disconnected from central: ");
    Serial.println(central.address());
  }
}