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

const int ledPin = 4;    //b

typedef struct struct_message {
  char message[32];
} struct_message;

struct_message myData;
uint8_t broadcastAddress[] = {0x74, 0x4d, 0xbd, 0x97, 0x4c, 0x78}; // Replace with the MAC address of the Seeed Xiao ESP32S3

void onReceive(const esp_now_recv_info *info, const uint8_t *incomingData, int len) {
  memcpy(&myData, incomingData, sizeof(myData));
  Serial.print("Bytes received: ");
  Serial.println(len);
  Serial.print("Message: ");
  Serial.println(myData.message);

  // Respond with "Welcome S3"
  strcpy(myData.message, "Welcome S3");
  esp_err_t result = esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));
    digitalWrite(ledPin, HIGH); //b
  if (result == ESP_OK) {
    Serial.println("Response sent with success");
  } else {
    Serial.println("Error sending the response");
  }
}

void onSent(const uint8_t *mac_addr, esp_now_send_status_t status) {
  Serial.print("\r\nLast Packet Send Status: ");
  Serial.println(status == ESP_NOW_SEND_SUCCESS ? "Delivery Success" : "Delivery Fail");
}

void setup() {
  Serial.begin(115200);

  WiFi.mode(WIFI_STA);
  Serial.print("Receiver MAC Address: ");
  Serial.println(WiFi.macAddress());

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

  esp_now_register_recv_cb(onReceive);
  esp_now_register_send_cb(onSent);

  esp_now_peer_info_t peerInfo;
  memcpy(peerInfo.peer_addr, broadcastAddress, 6);
  peerInfo.channel = 0;
  peerInfo.encrypt = false;

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

void loop() {
  // Nothing needed here
}