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

// Structure to receive data
typedef struct struct_message {
    int value;
} struct_message;

struct_message myData;

// New ESP-IDF v5.x compatible callback
void onDataRecv(const esp_now_recv_info_t *info, const uint8_t *incomingData, int len) {
    memcpy(&myData, incomingData, sizeof(myData));
    Serial.print("Received Value: ");
    Serial.println(myData.value);
}

void setup() {
    Serial.begin(115200);
    WiFi.mode(WIFI_STA); // Set ESP32 to Station mode

    // Initialize ESP-NOW
    if (esp_now_init() != ESP_OK) {
        Serial.println("ESP-NOW Init Failed!");
        return;
    }

    esp_now_register_recv_cb(onDataRecv); // Register new ESP-NOW receive callback
}

void loop() {
    // Do nothing, waiting for ESP-NOW messages
}