#include <OneWire.h>
#include <DallasTemperature.h>
#include <WiFi.h>
#include <ThingsBoard.h>
#include <Arduino_MQTT_Client.h>
#include <ArduinoHttpClient.h>
#include <PubSubClient.h>

//define sound speed in cm/uS
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.39370

#define TB_SERVER "thingsboard.cloud"
#define TB_TOKEN "3tl5UkMhDqYQs0Fw1EnJ"

#define WIFI_AP "Wokwi-GUEST"
#define WIFI_PASS ""

constexpr uint16_t MAX_MESSAGE_SIZE = 128U;

// Sensor -> ESP32 -> WiFi Client -> Arduino_MQTT_Client -> TB 
WiFiClient espClient;
Arduino_MQTT_Client mqttClient(espClient);
ThingsBoard tb(mqttClient, MAX_MESSAGE_SIZE);

const int trigPin = 19;
const int echoPin = 18;

long duration;
float distanceCm;
float distanceInch;

// GPIO where the DS18B20 is connected to
const int oneWireBus = 12;     
// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(oneWireBus);
// Pass our oneWire reference to Dallas Temperature sensor 
DallasTemperature sensors(&oneWire);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input


  // Connect to WiFi
  WiFi.begin(WIFI_AP, WIFI_PASS);
  Serial.println("Connecting to WiFi...");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("\nWiFi connected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());
  // Connect to ThingsBoard
  Serial.println("Connecting to ThingsBoard Server....");
  // 2 parameters - 1. TB_Server 2. TB_Token
  while(!tb.connect(TB_SERVER, TB_TOKEN)) {
    Serial.println("Failed to connect to ThingsBoard...");
    delay(500);
  }
  Serial.println("Connected to ThingsBoard...");
  
}

void loop() {
  sensors.requestTemperatures(); 
  float temperatureC = sensors.getTempCByIndex(0);
  float temperatureF = sensors.getTempFByIndex(0);
  Serial.print(temperatureC);
  Serial.println("ºC");
  Serial.print(temperatureF);
  Serial.println("ºF");


  // Send date to TB
  String jsonData = "{\"TemperatureC\":"+ String(temperatureC) +"}";
  tb.sendTelemetryJson(jsonData.c_str());
 
  String jsonData1 = "{\"TemperatureF\":"+ String(temperatureF) +"}";
  tb.sendTelemetryJson(jsonData1.c_str());
  Serial.println("Data is passed to ThingsBoard");


   // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance
  distanceCm = duration * SOUND_SPEED/2;
  
  // Convert to inches
  distanceInch = distanceCm * CM_TO_INCH;
  
  // Prints the distance in the Serial Monitor
  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);
  Serial.print("Distance (inch): ");
  Serial.println(distanceInch);
  
   // Send date to TB
  String jsonData2 = "{\"Distance\":"+ String(distanceCm) +"}";
  tb.sendTelemetryJson(jsonData2.c_str());
  
  String jsonData3 = "{\"Distance_INCH\":"+ String(distanceInch) +"}";
  tb.sendTelemetryJson(jsonData3.c_str());
  Serial.println("Data is passed to ThingsBoard");

  delay(1000);
}