#include <WiFi.h>
#include <PubSubClient.h>
#include <ESP32Servo.h>
#include "callBack.h"

char clientId[50];
int servoPin = 2;


WiFiClient espClient;
PubSubClient client(espClient);


void setup()
{
  WiFi.mode(WIFI_STA);
  WiFi.begin("Wokwi-GUEST", "");
  
  client.setServer("broker.emqx.io", 1883);
  client.setCallback(callBack);
  Serial.begin(9600);
  servoMotor.attach(servoPin, 500, 2400);
  

}


void loop() 
{
  if (!client.connected()) {
    client.connect(clientId);
    Serial.println("ESP32 is Connected with MQTT!");
    client.subscribe("topicName/iot");
  }
  client.loop();

}



sketch.ino

diagram.json

# Wokwi Library List
# See https://docs.wokwi.com/guides/libraries

PubSubClient
ESP32Servo

libraries.txt


#include "try2.h"

String callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  
  Serial.print(". Message: ");
  String Message;
  
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    Message += (char)message[i];
  }
  
  Serial.print(Message);
  

  int data = Message.toInt();
  test(data);
  
}



callBack.h

#include <ESP32Servo.h>
Servo servoMotor;

int test(int data){
  servoMotor.write(data);
  delay(15);
}