NodeMCU-Based IoT Project: Rotating Solar Panel

#include <SoftwareSerial.h>
SoftwareSerial mySerial(12, 13); // RX, TX

#include <ESP8266WiFi.h>          //https://github.com/esp8266/Arduino
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include "WiFiManager.h"          //https://github.com/tzapu/WiFiManager
#include <WiFiClientSecure.h>

int count=0,i,m,j,k;


#include <Servo.h>      // include library for servo motor
Servo myservo;           
#define ANALOG_INPUT A0
int ledy = 2; // yellow LED, d4
int ledg =12;  // green  LED , d6
int pos;
int value1, value2;


//////////////////////////////////////// ALL DECLARATIONS for CLOUD //////////////////////////////
const char* host = "api.thingsai.io";                                 // OR host = devapi2.thethingscloud.com
const char* post_url = "/devices/deviceData";       // OR /api/v2/thingscloud2/_table/data_ac
const char* time_server = "baas.thethingscloud.com";             //this is to convert timestamp
const int httpPort = 80;
const int httpsPort = 443;
const char*  server = "api.thingsai.io";  // Server URL

char timestamp[10];

WiFiClient client;


/////////////////////////////////////////////////////////////////////////////////////////////////////////
void configModeCallback (WiFiManager *myWiFiManager) 
{
  Serial.println("Entered config mode");             //*-*-*-*-*-*-*-*-*-*-*-*-*-*if control enters this function then net is not connected
  Serial.println(WiFi.softAPIP());                  // "WiFi.softAPIP() is for AP" , "WiFi.localIP() is for STA",
                                                                
  Serial.println(myWiFiManager->getConfigPortalSSID());             //if you used auto generated SSID, print it
}
/////////////////////////////////////// TIMESTAMP CALCULATION function///////////////////////////////////////
int GiveMeTimestamp()
{
  unsigned long timeout = millis();

  while (client.available() == 0)
  {
    if (millis() - timeout > 50000)
    {
      client.stop();
      return 0;
    }
  }

while (client.available())
      {
        String line = client.readStringUntil('\r');                    //indexOf() is a funtion to search for smthng , it returns -1 if not found
        int pos = line.indexOf("\"timestamp\"");                       //search for "\"timestamp\"" from beginning of response got and copy all data after that , it'll be your timestamp
        if (pos >= 0)                                                     
        {
          int j = 0;
          for(j=0;j<10;j++)
          {
            timestamp[j] = line[pos + 12 + j];
          }
        }
      }
}  
////////////////////////////////////////////////////////////////////////////////////////////////////////

void setup() 
{
  //Deifne output pins for Mux (here diode combinations)
  pinMode(ledy, OUTPUT);     
  pinMode(ledg, OUTPUT);     
  pinMode(16, OUTPUT);     // 16 and 5 th pin are connected to LDRs
  pinMode(5, OUTPUT);    //d0= 16, d1 =5 ,,, d0 connected to LDR 1 from left and d1 connected to LDR 2 from left
  
      myservo.attach(13);    // orange pin of servo motor to D7 of nodemcu
     // Serial.begin(115200);   no need of this line  
      myservo.write(0);        // make initial position of servo at 0 degree
      delay(2000);
      
  
  Serial.begin(115200);     //(19200,SERIAL_8E1) - data size = 8 bits , parity = Even , stop bit =  1bit
  mySerial.begin(115200);
  WiFiManager wifiManager;
 
  wifiManager.setAPCallback(configModeCallback);
                                                                                                    
  if(!wifiManager.autoConnect("iPankaj","80518051"))                   //wifiManager.autoConnect("AP-NAME", "AP-PASSWORD"); (OR) wifiManager.autoConnect("AP-NAME"); only ID no password (OR) wifiManager.autoConnect(); this will generate a ID by itself
  {
    Serial.println("failed to connect and hit timeout");     //control comes here after long time of creating Access point "NodeMCU" by NodeMCU and still it has not connected
    //reset and try again, or maybe put it to deep sleep
    ESP.reset();
    delay(1000);
  } 

  //if you come here you have connected to the WiFi
  Serial.println("connected...yeey :");
 
}

void loop() 
{
  //int analogValue = analogRead(outputpin);
{
 
 
  
/////////////////////////////////////// SEND THE QUERY AND RECEIVE THE RESPONSE///////////////////////  
 {
 
  digitalWrite(16, HIGH);   
  digitalWrite(5, LOW);
  delay(1000);
  value1 = analogRead(ANALOG_INPUT);   // Value of the sensor connected to LDR 1 from left
         // no need of these more identated if and else loop if you dont want to see the output in ledg and ledy...
              if(value1>=30)
              {
            
                 digitalWrite(ledy, HIGH);
                 delay(1000);
              }
              else 
              {
                digitalWrite(ledy, LOW);
                 delay(1000);
              }



  digitalWrite(16, LOW);
  digitalWrite(5, HIGH);
  delay(1000);
  value2 = analogRead(ANALOG_INPUT); //Value of the sensor connected to LDR 2 from left
   // here also no need of these "more identated" if and else loop if you dont want to see the output in ledg and ledy...
              if(value2>=30)
              {
            
                 digitalWrite(ledg, HIGH);
                 delay(1000);
              }
              else 
              {
                digitalWrite(ledg, LOW);
                 delay(1000);
              }

//this if condition checks for the day time and then COMPARES the values of both LDRs...accordingly the servo will move to that side...
         if( (value1>=30) &&(value2>=30) && (value1> value2))
         
         {
            
             pos= pos+ 5;   //gets rotated by 5 degree each time ..we may callibrate this pos value according to our use
             myservo.write(pos);  // max 180 degree...here it is limitation for this servo motor..we may have servo motor for 360 degree rotation
             delay(1000);
         }  
         else
         {    
            myservo.write(pos);
            delay(1000); 
         }
        }



          

  Serial.print("connecting to ");
  Serial.println(host);                          //defined upside :- host = devapi2.thethingscloud.com or 139.59.26.117

///////////////////////////////////// TIMESTAMP CODE SNIPPET /////////////////////////
Serial.println("inside get timestamp\n");
  if (!client.connect(time_server, httpPort)) 
  {
    return;                                                        //*-*-*-*-*-*-*-*-*-*
  }

  client.println("GET /api/timestamp HTTP/1.1");                            //Whats this part doing, i didnt get
  client.println("Host: baas.thethingscloud.com");
  client.println("Cache-Control: no-cache");
  client.println("Postman-Token: ea3c18c6-09ba-d049-ccf3-369a22a284b8");
  client.println();

GiveMeTimestamp();                        //it'll call the function which will get the timestamp response from the server
Serial.println("timestamp receieved");
Serial.println(timestamp);
///////////////////////////////////////////////////////////////////////////////

  Serial.println("inside ThingsCloudPost");

 
String PostValue = "{\"device_id\":  61121696053, \"slave_id\": 2";
         PostValue = PostValue + ",\"dts\":" +timestamp;
   PostValue = PostValue +",\"data\":{\"intensity1\":" + value1 +",\"intensity2\":" + value2 +",\"position\":" + pos +"}"+"}";
  
  
  Serial.println(PostValue);

/* create an instance of WiFiClientSecure */
    WiFiClientSecure client;
    
    Serial.println("Connect to server via port 443");
    if (!client.connect(server, 443)){
        Serial.println("Connection failed!");
    } else {
        Serial.println("Connected to server!");
        /* create HTTP request */

        client.println("POST /devices/deviceData HTTP/1.1");
        client.println("Host: api.thingsai.io");
        //client.println("Connection: close");
        client.println("Content-Type: application/json");
        client.println("cache-control: no-cache");
        client.println("Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.IjVhMzBkZDFkN2QwYjNhNGQzODkwYzQ4OSI.kaY6OMj5cYlWNqC2PNTkXs9PKy6_m9tdW5AG7ajfVlY");
        client.print("Content-Length: ");
        client.println(PostValue.length());
        client.println();
        client.println(PostValue);
//////////////////////////////////POSTING the data on to the cloud is done and now get the response form cloud server//////////////////
 Serial.print("Waiting for response ");
        while (!client.available()){
            delay(50); //
            Serial.print(".");
        }  
        /* if data is available then receive and print to Terminal */
        while (client.available()) {
            char c = client.read();
            Serial.write(c);
        }

        /* if the server disconnected, stop the client */
        if (!client.connected()) {
            Serial.println();
            Serial.println("Server disconnected");
            client.stop();
        }
    }
Serial.println("//////////////////////    THE END     /////////////////////");
delay(3000);
}
}