#include <WiFi.h>
#include <esp_now.h>

const int buttonPin = D1;
bool lastButtonState = HIGH;

// Receiver MAC address: DC:DA:0C:17:81:D4
uint8_t receiverMac[] = {0xDC, 0xDA, 0x0C, 0x17, 0x81, 0xD4};

void setup() {
  Serial.begin(115200);
  pinMode(buttonPin, INPUT_PULLUP);

  WiFi.mode(WIFI_STA);

  if (esp_now_init() != ESP_OK) {
    Serial.println("Error initializing ESP-NOW");
    return;
  }

  esp_now_peer_info_t peerInfo = {};
  memcpy(peerInfo.peer_addr, receiverMac, 6);
  peerInfo.channel = 0;  
  peerInfo.encrypt = false;

  if (esp_now_add_peer(&peerInfo) != ESP_OK) {
    Serial.println("Failed to add peer");
    return;
  }
}

void loop() {
  bool buttonState = digitalRead(buttonPin);
  if (buttonState != lastButtonState) {
    uint8_t data = buttonState == LOW ? 1 : 0;  // LOW means pressed
    esp_err_t result = esp_now_send(receiverMac, &data, sizeof(data));
    if (result == ESP_OK) {
      Serial.print("Sent: ");
      Serial.println(data);
    } else {
      Serial.println("Send Error");
    }
    lastButtonState = buttonState;
    delay(50);  // debounce
  }
}