#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 0.393701

//ThingsBoard connect
String TB_SERVER = "eu.thingsboard.cloud";
String TOKEN = "YWHnVX5FWShNdQkhcDYM";

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

#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);

long duration;
float distanceCm;
float distanceInch;

void setup() {
  Serial.begin(115200); // Starts the serial communication
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input

  WiFi.begin(WIFI_AP, WIFI_PASS);
  Serial.println("Connecting to WiFi");

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

  Serial.println("");
  Serial.println("\nWiFi connected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());

  //Connect to thingBoard
  Serial.println("Connecting to ThingsBoard Server...");
  //2 parameter 1. TB_SERVER 2. TB_TOKEN
  while(!tb.connect(TB_SERVER, TB_TOKEN)){
    Serial.println("Failed");
  }
}

void loop() {
  // 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);

  String jsonData = "{\"Distance\":"+ String(distanceCm) +"}";
  tb.sendTelemetryJson(jsonData.c_str());
  Serial.println("Data is passed to ThingsBoard");
  String jsonData1 = "{\"Distance_INCH\":"+ String(distanceInch) +"}";
  tb.sendTelemetryJson(jsonData1.c_str());
  Serial.println("Data is passed to ThingsBoard");
  
  delay(1000);
}


// curl -v -X POST http://thingsboard.cloud/api/v1/I1Ryiz0W5PNmpDZYt1LZ/telemetry --header Content-Type:application/json --data "{temperature:25}"