EspNOW toggle

#include <esp_now.h>
#include <WiFi.h>
#define LED_Pin 4
#define BTN_Pin 15

bool lock = true;
bool toggle = false;

int BTN_State; //--> Variable to hold the button state.

uint8_t broadcastAddress[] = {
  0x00,
  0x00,
  0x00,
  0x00,
  0x00,
  0x00
}; //--> REPLACE WITH THE MAC Address of your receiver.

int LED_State_Send = 0;

int LED_State_Receive;
String success;
typedef struct struct_message {
  int led;
}
struct_message_send;

struct_message send_Data;

struct_message receive_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");
  if (status == 0) {
    success = "Delivery Success :)";
  } else {
    success = "Delivery Fail :(";
  }
  Serial.println(">>>>>");
}

void OnDataRecv(const uint8_t * mac,
  const uint8_t * incomingData, int len) {
  memcpy( & receive_Data, incomingData, sizeof(receive_Data));
  Serial.println();
  Serial.println("<<<<< Receive Data:");
  Serial.print("Bytes received: ");
  Serial.println(len);
  LED_State_Receive = receive_Data.led;
  Serial.print("Receive Data: ");
  Serial.println(LED_State_Receive);
  Serial.println("<<<<<");

  if (LED_State_Recived == true && lock == true) {
    toggle = !toggle;
    lock = false;
  }
  if (LED_State_Recived == low && lock == false) {
    lock = true;
  }
  digitalWrite(LED_Pin, LED_State_Receive);
}

void setup() {
  Serial.begin(115200);
  pinMode(LED_Pin, OUTPUT);
  pinMode(BTN_Pin, INPUT);
  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_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;
  }
  esp_now_register_recv_cb(OnDataRecv); //--> Register for a callback function that will be called when data is received
}

void loop() {
  BTN_State = digitalRead(BTN_Pin); //--> Reads and holds button states.
  if (BTN_State == 1) {
    LED_State_Send = !LED_State_Send;
    send_Data.led = LED_State_Send;
    Serial.println();
    Serial.print(">>>>> ");
    Serial.println("Send data");
    esp_err_t result = esp_now_send(broadcastAddress, (uint8_t * ) & send_Data, sizeof(send_Data));
    if (result == ESP_OK) {
      Serial.println("Sent with success");
    } else {
      Serial.println("Error sending the data");
    }
    while (BTN_State == 1) {
      BTN_State = digitalRead(BTN_Pin);
      delay(10);
    }
  }
}