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

// Enter the receiver's MAC address here.
uint8_t broadcastAddress[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

typedef struct struct_message {
    char a[32];
    int b;
} struct_message;

struct_message myData;
esp_now_peer_info_t peerInfo;

// Callback when sending data.
void OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {
  Serial.print("\r\nLast Packet Send Status:\t");
  Serial.println(status == ESP_NOW_SEND_SUCCESS ? "Delivery Success" : "Delivery Fail");
}

void setup() {
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);

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

 // esp_now_register_send_cb(OnDataSent);
   esp_now_register_send_cb((esp_now_send_cb_t)OnDataSent);
  //Register on the Peer board.
  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() {
  strcpy(myData.a, "Hello ESP-NOW");
  myData.b = random(1, 100);

  //Send data
  esp_err_t result = esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));
   
  if (result == ESP_OK) {
    Serial.println("Sent with success");
  } else {
    Serial.println("Error sending the data");
  }
  delay(2000);
}