ESP32, protocolo esp now, pulsador tipo «timbre»

#include <Arduino.h>
#include <WiFi.h>
#include <esp_now.h>
uint8_t broadcastAddress[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
const int pulsador = 12;
// Structure example to receive data
typedef struct struct_message
{
  int a;
} struct_message;
// Create a struct_message called myData
struct_message myDataSen;
esp_now_peer_info_t peerInfo;
// callback when data is sent
void OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status)
{
}
void setup()
{
  // Initialize Serial Monitor
  Serial.begin(9600);
  pinMode(pulsador, INPUT_PULLDOWN);
  // Set device as a Wi-Fi Station
  WiFi.mode(WIFI_STA);
  // Init ESP-NOW
  if (esp_now_init() != ESP_OK)
  {
    Serial.println("Error initializing ESP-NOW");
    return;
  }
  // Once ESPNow is successfully Init, we will register for Send CB to get the status of Trasnmitted packet
  esp_now_register_send_cb(OnDataSent);

  // Register peer. Este apartado del peer es utilizado para el envio del paquete
  memcpy(peerInfo.peer_addr, broadcastAddress, 6);
  peerInfo.channel = 0;
  peerInfo.encrypt = false;
  // Add peer
  if (esp_now_add_peer(&peerInfo) != ESP_OK)
  {
    Serial.println("Failed to add peer");
    return;
  }
}
void loop()
{
  while (digitalRead(pulsador) == HIGH)
  {
    myDataSen.a = 2;
    // Send message via ESP-NOW
    esp_err_t result = esp_now_send(broadcastAddress, (uint8_t *)&myDataSen, sizeof(myDataSen));
  }
  if (digitalRead(pulsador) == LOW)
  {
    myDataSen.a = 3;
    // Send message via ESP-NOW
    esp_err_t result = esp_now_send(broadcastAddress, (uint8_t *)&myDataSen, sizeof(myDataSen));
  }
}

#include <Arduino.h>
#include <WiFi.h>
#include <esp_now.h>
const int led = 14;
// Structure example to send data
// Must match the receiver structure
typedef struct struct_message
{
  int a;
} struct_message;
// Create a struct_message called myData
struct_message myDataRec;
// callback function that will be executed when data is received
void OnDataRecv(const uint8_t *mac, const uint8_t *incomingData, int len)
{
  memcpy(&myDataRec, incomingData, sizeof(myDataRec));
  if (myDataRec.a == 2)
  {
    digitalWrite(led, HIGH);
  }
  if (myDataRec.a == 3)
  {
    digitalWrite(led, LOW);
  }
}
void setup()
{
  // Init Serial Monitor
  Serial.begin(9600);
  pinMode(led, OUTPUT);
  // Set device as a Wi-Fi Station
  WiFi.mode(WIFI_STA);
  // Init ESP-NOW
  if (esp_now_init() != ESP_OK)
  {
    Serial.println("Error initializing ESP-NOW");
    return;
  }
  // Once ESPNow is successfully Init, we will register for recv CB to get recv packer info
  esp_now_register_recv_cb(OnDataRecv);
}
void loop()
{
}