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

#define TB_SERVER "thingsboard.cloud";
#define TB_TOKEN "AvtvdtzFxgGjMqfcLJTV"

const int trigPin = 4;
const int echoPin = 16;


// Name of the Router and Password
const char* ssid = "Wokwi-GUEST";
const char* password = "";

constexpr uint16_t MAX_MESSAGE_SIZE = 128U; //128/256/512

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

//define sound speed in cm/uS
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701

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

  
 // Start wifi - 2 parameters (ssid & password)
 WiFi.begin(ssid, password);
 Serial.println("Connecting to WiFi");

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

 // Connection Info
 Serial.println();
 Serial.println("WiFi Connected...");
 Serial.print("IP Address: ");
 Serial.println(WiFi.localIP());

}

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);
  
  delay(1000);
}

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