#include "WiFi.h"
#include"PubSubClient.h"
#define BUTTON_PIN 14 // ESP32 GIOP16 pin connected to button's pin
#define BUZZER_PIN 2 // ESP32 GIOP21 pin connected to Buzzer's pin
const char* ssid = "Wokwi-GUEST";  
const char* password = ""; 
const char* mqtt_server="broker.mqttdashboard.com";
WiFiClient espclient;
char message_tosend[50];
String messageTemp;
String messages;
String SEND ;

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

PubSubClient client(mqtt_server,1883,callback,espclient);


void setup() {
  Serial.begin(9600);                // initialize serial
  pinMode(BUTTON_PIN, INPUT_PULLUP); // set ESP32 pin to input pull-up mode
  pinMode(BUZZER_PIN, OUTPUT);       // set ESP32 pin to output mode
  Serial.print("connecting");
  Serial.print(ssid);
  WiFi.begin(ssid,password);      
  while(WiFi.status()!=WL_CONNECTED){
    delay(500);
    Serial.print(".");
}
}


void reconnect(){

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

 
void loop() {
  
  if (!client.connected()) {
    reconnect();
    }
  
  client.loop();
  
  delay(2000);
  
//Preparing for mqtt send


   SEND = messageTemp; //converting temperature (the float variable above) to a string 
   SEND.toCharArray(message_tosend, SEND.length() + 1); //packaging up the data to publish to mqtt whoa...
  

  if(client.connect("ESP32test1000")){
    Serial.println("connected to node-red");
    client.publish("buzzer",message_tosend);
    }
   else{
      Serial.print("failed,rc=");
      Serial.println(client.state());
      delay(500);
    }
        if (digitalRead(BUTTON_PIN) == LOW) {
    Serial.println("The button is being pressed");
    digitalWrite(BUZZER_PIN, HIGH); // turn on
    tone(BUZZER_PIN,500);
    messageTemp="Someon's at the door";
  }
  else if (digitalRead(BUTTON_PIN) == HIGH) {
    Serial.println("The button is unpressed");
    digitalWrite(BUZZER_PIN, LOW);  // turn off
    tone(BUZZER_PIN,0);
    messageTemp="No one there";
  }
}