#include <WiFi.h>//library for wifi
#include <PubSubClient.h>//library for MQtt 
#include <HTTPClient.h>

#define TRIG_PIN 18 // ESP32 pin GIOP23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN 5 // ESP32 pin GIOP22 connected to Ultrasonic Sensor's ECHO pin
#define LED 2
#define LED2 4
float duration_us, distance_cm;

void callback(char* subscribetopic, byte* payload, unsigned int payloadLength); 

#define ORG "mef36s"//IBM ORGANITION ID
#define DEVICE_TYPE "iot"//Device type mentioned in ibm watson IOT Platform
#define DEVICE_ID "12345"//Device ID mentioned in ibm watson IOT Platform
#define TOKEN "05082003"     //Token
float h, t;

char server[] = ORG ".messaging.internetofthings.ibmcloud.com";// Server Name
char publishTopic[] = "iot-2/evt/Data/fmt/json";// topic name and type of event perform and format in which data to be send
char subscribetopic[] = "iot-2/cmd/command/fmt/String";// cmd  REPRESENT command type AND COMMAND IS TEST OF FORMAT STRING
char authMethod[] = "use-token-auth";// authentication method
char token[] = TOKEN;
char clientId[] = "d:" ORG ":" DEVICE_TYPE ":" DEVICE_ID;//client id

WiFiClient wifiClient; // creating the instance for wificlient
PubSubClient client(server, 1883, callback ,wifiClient); //calling the predefined client id by passing parameter like server id,portand wificredential

String serverPath = "https://reqbin.com/echo/get/json";

void setup() {
  // begin serial port
  Serial.begin (9600);

 
  wificonnect();
  mqttconnect();
}

void loop() {
  // generate 10-microsecond pulse to TRIG pin


  
  PublishData();
  delay(1000);
  if (!client.loop()) {
    mqttconnect();
  }
}





void PublishData() {
  mqttconnect();//function call for connecting to ibm

  String payload = "{\"vivek \" : \"succ\" }";

  
  Serial.print("Sending payload: ");
  Serial.println(payload);



  
  if (client.publish(publishTopic, (char*) payload.c_str())) {
    Serial.println("Publish ok");// if it sucessfully upload data on the cloud then it will print publish ok in Serial monitor or else it will print publish failed
  } else {
    Serial.println("Publish failed");
  }
  
}

void mqttconnect() {
  if (!client.connected()) {
    Serial.print("Reconnecting client to ");
    Serial.println(server);
    while (!!!client.connect(clientId, authMethod, token)) {
      Serial.print(".");
      delay(500);
    }
      
     
     
  }
}
void wificonnect()
{
  Serial.println();
  Serial.print("Connecting to ");

  WiFi.begin("Wokwi-GUEST", "", 6);//passing the wifi credentials to establish the connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());


}


void callback(char* subscribetopic, byte* payload, unsigned int payloadLength) 
{
  
  Serial.print("callback invoked for topic: ");
  Serial.println(subscribetopic);

}