/**
   ESP32 + DHT22 Example for Wokwi
   
   https://wokwi.com/arduino/projects/322410731508073042
*/

#include "Secrets.h"
#include <WiFiClientSecure.h>
#include <PubSubClient.h>
#include <ArduinoJson.h>
#include "WiFi.h"
#include "DHTesp.h"

const int DHTPIN = 15;

#define AWS_IOT_PUBLISH_TOPIC   "esp32/pub"
#define AWS_IOT_SUBSCRIBE_TOPIC "esp32/pub"

DHTesp dhtSensor;
WiFiClientSecure net = WiFiClientSecure();
PubSubClient client(net);

float h ;
float t;

void connectAWS()
{
  WiFi.begin("Wokwi-GUEST", "", 6);
 
  Serial.println("Connecting to Wi-Fi");
 
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
  Serial.println(" Connected!");
 
  // Configure WiFiClientSecure to use the AWS IoT device credentials
  net.setCACert(AWS_CERT_CA);
  net.setCertificate(AWS_CERT_CRT);
  net.setPrivateKey(AWS_CERT_PRIVATE);
 
  // Connect to the MQTT broker on the AWS endpoint we defined earlier
  client.setServer(AWS_IOT_ENDPOINT, 8883);
 
  // Create a message handler
  client.setCallback(messageHandler);
 
  Serial.println("Connecting to AWS IOT");
 
  while (!client.connect(THINGNAME))
  {
    Serial.print(".");
    delay(100);
  }
 
  if (!client.connected())
  {
    Serial.println("AWS IoT Timeout!");
    return;
  }
 
  // Subscribe to a topic
  client.subscribe(AWS_IOT_SUBSCRIBE_TOPIC);
 
  Serial.println("AWS IoT Connected!");
}

void publishMessage()
{
  StaticJsonDocument<200> doc;
  doc["humidity"] = h;
  doc["temperature"] = t;
  char jsonBuffer[512];
  serializeJson(doc, jsonBuffer); // print to client
 
  client.publish(AWS_IOT_PUBLISH_TOPIC, jsonBuffer);
}

void messageHandler(char* topic, byte* payload, unsigned int length)
{
  Serial.print("incoming: ");
  Serial.println(topic);
 
  StaticJsonDocument<200> doc;
  deserializeJson(doc, payload);
  const char* message = doc["message"];
  Serial.println(message);
}

void setup() {
  Serial.begin(115200);
  connectAWS();
  dhtSensor.setup(DHTPIN, DHTesp::DHT22);
}

void loop() {
   // only receiving messages
 
  // publishMessage();
  client.loop();
  delay(5000);
}