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

#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701
#define TB_SERVER "thingsboard.cloud"
#define TB_TOKEN "Ognypga6KkbINhGF73M7p"

const int trigPin = 5;
const int echoPin = 18;

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

constexpr uint32_t MAX_MESSAGE_SIZE=128U;

WiFiClient espClient;
Arduino_MQTT_Client mqttClient(espClient);
ThingsBoard tb(mqttClient,MAX_MESSAGE_SIZE);


long duration;
float distanceCm;
float distanceInch;

void setup() {
  Serial.begin(115200);


  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

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


  Serial.println("Connecting to ThingsBoard Server....");
  while (!tb.connect(TB_SERVER, TB_TOKEN)) {
    Serial.println("Failed to connect to ThingsBoard...");
    delay(500);
  }
  Serial.println("Connected to ThingsBoard...");
  
}

void loop() {
  // Measure distance
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);


  distanceCm = duration * SOUND_SPEED / 2;
  distanceInch = distanceCm * CM_TO_INCH;

  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);
  Serial.print("Distance (inch): ");
  Serial.println(distanceInch);


 String j="{\"Distance\" : "+ String(distanceCm)+"}";
 tb.sendTelemetryJson(j.c_str());
 Serial.print("Data is passed to thinkboard ");

  delay(1000);
}
//curl -v -X POST http://thingsboard.cloud/api/v1/gnypga6KkbINhGF73M7p/telemetry --header Content-Type:application/json --data "{temperature:25}"