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

const char* ssid     = "ANLI";
const char* password = "Actua1455";

const char* mqtt_server = "broker.emqx.io";
const char* mqtt_Client = "ANDRUClient2025";
const char* mqtt_Topic_Sub ="FabAcademy/week11";

WiFiClient espClient;
PubSubClient client(espClient);

// Servo setup
Servo myServo;
const int servoPin = D5;



void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  setup_wifi();

  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);

   myServo.attach(servoPin);

}

void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

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

  if (String(topic) == mqtt_Topic_Sub) {
    int angle = messageTemp.toInt();         
    angle = constrain(angle, 0, 180);    
    Serial.print("Moving servo to ");
    Serial.print(angle);
    Serial.println(" degrees");
    myServo.write(angle);
  }
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect(mqtt_Client)) {
      Serial.println("connected");
      // Subscribe
      client.subscribe(mqtt_Topic_Sub);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void loop() {
  // put your main code here, to run repeatedly:

  if (!client.connected()) {
    reconnect();
  }
  client.loop();

}