// 2449981
// SUXJ9Z8ZTOJHGP80

#include <WiFi.h>
#include <ThingSpeak.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* server = "api.thingspeak.com";
const int myChannelNumber = 2449981 ;
const char* myApiKey = "SUXJ9Z8ZTOJHGP80";

const int triggerPin = 12;
const int echoPin = 14;


void setup() {
  Serial.begin(115200);
  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT);

  WiFi.begin(ssid, password);
  Serial.println("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("...");
  }
  Serial.println("Wifi connected !");
  Serial.println("Local IP: " + String(WiFi.localIP()));
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
}

void loop() {
  long duration, distance;
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  sendDistanceToThingSpeak(distance);
 
  delay(500); // Adjust delay as needed
}

void sendDistanceToThingSpeak(long distance) {
  char jsonBuffer[100];
  snprintf(jsonBuffer, sizeof(jsonBuffer), "{\"distance\": %ld}", distance);

  Serial.print("Sending data to Thingsboard: ");
  Serial.println(jsonBuffer);

    Serial.println("Publish success");
  } else {
    Serial.println("Publish failed");
  
  }

void reconnect() {
  while (!client.connected()) {
    Serial.println("Attempting MQTT connection...");
    if (client.connect("ESP32Client", NULL)) {
      Serial.println("Connected to Thingsboard MQTT");
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client());
      Serial.println(" Retrying in 5 seconds...");
      delay(5000);
    }
  }
}