/**
   ESP32 + DHT22 Example for Wokwi
   
   https://wokwi.com/arduino/projects/322410731508073042
*/
#include <WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"

/************************* WiFi Access Point ***************************/
#define WLAN_SSID "Wokwi-GUEST"
#define WLAN_PASS ""
/************************* Adafruit.io Setup ***************************/
#define AIO_SERVER      "io.adafruit.com"
#define AIO_SERVERPORT  1883                   // use 8883 for SSL
#define AIO_USERNAME  "mangsanca"
#define AIO_KEY       "aio_hzrW73aUHDgj6I2LQmmHWQ8j7jsh"
#define AIO_FEED_1      "/feeds/temperature"
#define AIO_FEED_2      "/feeds/humidity"
#define AIO_FEED_3      "/feeds/on-slash-off"

/************ Global State (you don't need to change this!) ************/
#define LED_PIN 13

// Create an ESP8266 WiFiClient class to connect to the MQTT server.
WiFiClient client;

// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_USERNAME, AIO_KEY);

/****************************** Feeds ***************************************/

// Setup feeds 'temp' and 'hmdt' for publishing.
Adafruit_MQTT_Publish temp = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME AIO_FEED_1);
Adafruit_MQTT_Publish hmdt = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME AIO_FEED_2);

// Setup a feed called 'onoff' for subscribing to changes to the ON/OFF button
Adafruit_MQTT_Subscribe onoffbtn = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME AIO_FEED_3, MQTT_QOS_1);

// Function to connect and reconnect as necessary to the MQTT server.
// Should be called in the loop function and it will take care if connecting.
void MQTT_connect() {
  int8_t ret;
  // Stop if already connected.
  if (mqtt.connected()) {
    return;
  }
  Serial.print("Connecting to MQTT... ");
  uint8_t retries = 3;
  while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
    Serial.println(mqtt.connectErrorString(ret));
    Serial.println("Retrying MQTT connection in 10 seconds...");
    mqtt.disconnect();
    delay(10000);  // wait 10 seconds
    retries--;
    if (retries == 0) {
      // basically die and wait for WDT to reset me
      while (1);
    }
  }
  Serial.println("MQTT Connected!");
}

// Function called back when an onoffbutton feed message arrives
void onoffcallback(char *data, uint16_t len) {
  Serial.print("Data yang diterima dari MQTT Broker : ");
  Serial.println(data);
  if (strcmp(data, "ON") == 0) {
    Serial.println("Lampu Nyala");
    digitalWrite(LED_PIN, HIGH);
  } else {
    Serial.println("Lampu Padam");
    digitalWrite(LED_PIN, LOW);
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);

  delay(10);

  Serial.println(F("Adafruit MQTT demo"));

  // Connect to WiFi access point.
  Serial.print("Connecting to ");
  Serial.println(WLAN_SSID);

  WiFi.begin(WLAN_SSID, WLAN_PASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println(); Serial.println("WiFi connected");
  Serial.println("IP address: "); Serial.println(WiFi.localIP());

  // Set the callback function to be called when feed's message arrives
  onoffbtn.setCallback(onoffcallback);
  
  // Setup MQTT subscription for time feed.
  mqtt.subscribe(&onoffbtn);
}

unsigned long lastMsg = 0;

void loop() {
  // Ensure the connection to the MQTT server is alive (this will make the first
  // connection and automatically reconnect when disconnected).  See the MQTT_connect
  // function definition further below.
  MQTT_connect();

  // this is our 'wait for incoming subscription packets and callback em' busy subloop
  // try to spend your time here:
  mqtt.processPackets(10000);
  
  // ping the server to keep the mqtt connection alive
  // NOT required if you are publishing once every KEEPALIVE seconds
  
  if(! mqtt.ping()) {
    mqtt.disconnect();
  }
  
  // Publish feeds
  unsigned long now = millis();
  if (now - lastMsg > 20000) {
    lastMsg = now;
    float randTemp = random(0,100);
    float randHum = random(20,80);
    Serial.println("Temperature: " + String(randTemp, 1) + "°C");
    Serial.println("Humidity...: " + String(randHum, 1) + "%");
    Serial.println("---");
    char strTemperature[20], strHumidity[20];
    sprintf(strTemperature, "%.1f",randTemp );
    sprintf(strHumidity, "%.0f", randHum);
    temp.publish(strTemperature);
    hmdt.publish(strHumidity);
  }
}