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

int LED1= 33;
int LED2 =2;
int LED3= 4;
int LDR = 32;
int LDRReading = 0;  
int threshold_val = 800; 

int flag=0;

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

//-------credentials of IBM Accounts------

#define ORG "qeseew"//IBM ORGANITION ID
#define DEVICE_TYPE "Street-Light"//Device type mentioned in ibm watson IOT Platform
#define DEVICE_ID "143143" //Device ID mentioned in ibm watson IOT Platform
#define TOKEN "12345678"     //Token
String data3;
float Light_Intensity ;


//-------- Customise the above values --------
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/test/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
void setup()// configureing the ESP32 
{
  Serial.begin(115200);
 
  pinMode(LED1,OUTPUT);
  pinMode(LED2,OUTPUT);
  pinMode(LED3,OUTPUT);
  delay(10);
  Serial.println();
  wificonnect();
  mqttconnect();
}

void loop()// Recursive Function
{

 
  int Light_Intensity = analogRead(LDR);
  PublishData(Light_Intensity);
  delay(1000);
  

  Serial.print("Light Intensity = ");
  Serial.print(Light_Intensity);   
  if (Light_Intensity < 40) {
    Serial.println(" => Dark");
  } else if (Light_Intensity < 800) {
    Serial.println(" => Dim");
  } else if (Light_Intensity < 2000) {
    Serial.println(" => Light");
  } else if (Light_Intensity < 3200) {
    Serial.println(" => Bright");
  } else {
    Serial.println(" => Very bright");
  }

  delay(500);
  
  
  if (!client.loop()) {
    mqttconnect();
  }
  
}



/*.....................................retrieving to Cloud...............................*/

void PublishData(float Light_Intensity ) {
  mqttconnect();//function call for connecting to ibm*/
 
  String payload = " ";
  payload += Light_Intensity;
 

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

  
  if (client.publish(publishTopic, (char*) payload.c_str())) {
    Serial.println("Publish ok");// if it successfully 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);
    }
      
     initManagedDevice();
     Serial.println();
  }
}
void wificonnect() //function defination for 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 initManagedDevice() {
  if (client.subscribe(subscribetopic)) {
    Serial.println((subscribetopic));
    Serial.println("subscribe to cmd OK");
  } else {
    Serial.println("subscribe to cmd FAILED");
  }
}

void callback(char* subscribetopic, byte* payload, unsigned int payloadLength) 
{
  
  
  Serial.print("callback invoked for topic: ");
  Serial.println(subscribetopic);
 
  for (int i = 0; i < payloadLength; i++) {
    //Serial.print((char)payload[i]);
    data3 += (char)payload[i];
  }
  
  Serial.println("data: "+ data3); 
  if(data3=="lighton1")
  {
  Serial.println(data3);
  digitalWrite(LED1,HIGH);
 
  }

  else if(data3=="lightoff1") 
  {
  Serial.println(data3);
  digitalWrite(LED1,LOW);


  }
  else if(data3=="lighton2")
  {
  Serial.println(data3);
  digitalWrite(LED2,HIGH);
 
  }

  else if(data3=="lightoff2") 
  {
  Serial.println(data3);
  digitalWrite(LED2,LOW);

  }
  else if(data3=="lighton3")
  {
  Serial.println(data3);
  digitalWrite(LED3,HIGH);
 
  }

  else if(data3=="lightoff3") 
  {
  Serial.println(data3);
 digitalWrite(LED3,LOW);

  }
data3="";


  
}