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

typedef struct struct_message {
  int value;
} struct_message;

struct_message msg;

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

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

  Serial.print("Received: ");
  Serial.println(msg.value);
}

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

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

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

  esp_now_register_recv_cb(OnDataRecv);

  Serial.println("Receiver ready");
}

void loop() {}