ESP8266 ESP now receiver Worked

/****************************************************************************************************************************************************
 *  TITLE: ESP-NOW Getting Started Examples
 *
 *  By Frenoy Osburn
 *  YouTube Video: https://youtu.be/_cNAsTB5JpM
 ****************************************************************************************************************************************************/

 /********************************************************************************************************************
  * Please make sure that you install the board support package for the ESP8266 boards.
  * You will need to add the following URL to your Arduino preferences.
  * Boards Manager URL: http://arduino.esp8266.com/stable/package_esp8266com_index.json
 ********************************************************************************************************************/

 /********************************************************************************************************************
 *  Board Settings:
 *  Board: "WeMos D1 R1 or Mini"
 *  Upload Speed: "921600"
 *  CPU Frequency: "80MHz"
 *  Flash Size: "4MB (FS:@MB OTA:~1019KB)"
 *  Debug Port: "Disabled"
 *  Debug Level: "None"
 *  VTables: "Flash"
 *  IwIP Variant: "v2 Lower Memory"
 *  Exception: "Legacy (new can return nullptr)"
 *  Erase Flash: "Only Sketch"
 *  SSL Support: "All SSL ciphers (most compatible)"
 *  COM Port: Depends *On Your System*
 *********************************************************************************************************************/
 #include<ESP8266WiFi.h>
#include<espnow.h>

#define MY_NAME   "SLAVE_NODE"

struct __attribute__((packed)) dataPacket {
  int sensor1;
  int sensor2;
  float sensor3;
};

void dataReceived(uint8_t *senderMac, uint8_t *data, uint8_t dataLength) {
  char macStr[18];
  dataPacket packet;

  snprintf(macStr, sizeof(macStr), "%02x:%02x:%02x:%02x:%02x:%02x", senderMac[0], senderMac[1], senderMac[2], senderMac[3], senderMac[4], senderMac[5]);

  Serial.println();
  Serial.print("Received data from: ");
  Serial.println(macStr);

  memcpy(&packet, data, sizeof(packet));

  Serial.print("sensor1: ");
  Serial.println(packet.sensor1);
  Serial.print("sensor2: ");
  Serial.println(packet.sensor2);
  Serial.print("sensor3: ");
  Serial.println(packet.sensor3);
}

void setup() {

  Serial.begin(115200);     // initialize serial port

  Serial.println();
  Serial.println();
  Serial.println();
  Serial.print("Initializing...");
  Serial.println(MY_NAME);
  Serial.print("My MAC address is: ");
  Serial.println(WiFi.macAddress());

  WiFi.mode(WIFI_STA);
  WiFi.disconnect();        // we do not want to connect to a WiFi network

  if(esp_now_init() != 0) {
    Serial.println("ESP-NOW initialization failed");
    return;
  }

  esp_now_register_recv_cb(dataReceived);   // this function will get called once all data is sent

  Serial.println("Initialized.");
}

void loop() {

}