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

#define NODE_3 3
#define LED_PIN D0

// 🔴 REPLACE with your Node 1 MAC
uint8_t macNode1[] = {0x58, 0xE6, 0xC5, 0x19, 0xAD, 0xC8};

typedef struct {
  int targetID;
  int command;
} Message;

void OnDataRecv(const esp_now_recv_info_t *info,
                const uint8_t *incomingData,
                int len) {

  Serial.println("Packet received");

  Message msg;
  memcpy(&msg, incomingData, sizeof(msg));

  if (msg.targetID != NODE_3) return;

  Serial.println("Node 3 → blinking LED");

  digitalWrite(LED_PIN, HIGH);
  delay(300);
  digitalWrite(LED_PIN, LOW);
}

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);

  WiFi.mode(WIFI_STA);
  WiFi.disconnect();

  esp_now_init();

  // Add Master as peer
  esp_now_peer_info_t peer = {};
  memcpy(peer.peer_addr, macNode1, 6);
  peer.channel = 0;
  peer.encrypt = false;
  esp_now_add_peer(&peer);

  esp_now_register_recv_cb(OnDataRecv);

  Serial.println("Node 3 ready");
}

void loop() {}