#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

int count=0,i,m,j,k;
int t,t1,t2,t3;
int outputpin= A0;//ds18b20 #define switch1 D4 #define switch2 D7

const int trigPin = D5;
const int echoPin = D6;
long duration;
int distance,d1;
int openclose = 0;

//////////////////////////////////////// ALL DECLARATIONS for CLOUD //////////////////////////////
const char* host = "api.thingsio.ai";                                 // 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;

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() {  pinMode(switch1,OUTPUT);  pinMode(switch2,OUTPUT);  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output  pinMode(echoPin, INPUT); // Sets the echoPin as an Input    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("DDIK Makadia","kidd123456789"))                   //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..."); }

void loop() {  /////////////////////////////////////// SEND THE QUERY AND RECEIVE THE RESPONSE///////////////////////    digitalWrite(trigPin, LOW);  delayMicroseconds(2);  digitalWrite(trigPin, HIGH);  delayMicroseconds(10);  digitalWrite(trigPin, LOW);  duration = pulseIn(echoPin, HIGH);  distance = int(duration*0.034/2);    Serial.print("Distance : ");  Serial.println(distance);
  if(distance<200) //car is near to the gate //as per your wish  {    digitalWrite(switch1,HIGH);    openclose = 0;    Serial.println("Door Opening Soon");  }  else if(distance>200) //car is far to the gate  {    digitalWrite(switch2,HIGH);    openclose = 1;    Serial.println("Door Closing Soon");  }    Serial.println("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);
///////////////////////////////////////////////////////////////////////////////

// Use WiFiClient class to create TCP connections  if (!client.connect(host, httpPort))            //host = devapi2.thethingscloud.com , port = 80  {    Serial.println("connection failed");                  // *-*-*-*-*-*--*-*-*-*-*-*-*-*-*-*-*-*-    return;  }    client.print("Content-Length: ");  client.println();   unsigned long timeout = millis();  while (client.available() == 0)   {    if (millis() - timeout > 50000)     {      Serial.println(">>> Client Timeout !");      client.stop();      return;    }  }    Serial.println("***********************************************");  Serial.println();  Serial.println("closing connection");
  Serial.println("inside ThingsCloudPost");  int timestamp1 =0;  timestamp1 = 1542800778;   String PostValue = "{\"device_id\":  xxxxxx, \"slave_id\": 1";  PostValue = PostValue + ",\"dts\":" +timestamp;  PostValue = PostValue +",\"data\":{\"Open=0/Close=1\":" + openclose +",\"Distance\":" + distance +"}"+"}";      Serial.println(PostValue);

//////////////////////////////// try to connect to server again and POST the data on the cloud //////////////////////////  if (!client.connect(host, httpPort))   {    return;  }
  client.print("POST ");  client.print(post_url);               /// POST api/device-datas         HTTP/1.1     Host: baas.thethingscloud.com      Content-Type: application/json        Cache-Control: no-cache  client.println(" HTTP/1.1");           //Authorization:          Content-Length:   client.print("Host: ");  client.println(host);  client.println("Content-Type: application/json");  client.println("Cache-Control: no-cache");  client.print("Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.IjViZTc5ZjRiNDAyYjlkNGI5MDdiZGRmZCI.hBa2XTagbf56p_E83PeMZHaoJO4EUrbwGcmWTU0j0-w");  client.println();  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//////////////////  while (client.available() == 0)   {    if (millis() - timeout > 50000)     {      Serial.println(">>> Client Timeout !");      client.stop();      return;    }  }    Serial.println("Response From Server");  while(client.available())  {     String line2 = client.readStringUntil('\r');       Serial.print(line2);      }      Serial.println("//////////////////////    THE END     /////////////////////");  delay(3000);  }