#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 

//////////////////////////////////////// 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() {  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("xxxxxxxxxxxxxx","xxxxxxxxxx")) //you have to change                   //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() {  int analogValue = analogRead(outputpin);
{   /////////////////////////////////////// SEND THE QUERY AND RECEIVE THE RESPONSE///////////////////////  

        t1=(analogValue/1024.0) *5000;        Serial.print("temp: ");        Serial.println(t1);
        t2=(t1/10);        Serial.print("celc: ");        Serial.println(t2);
        t3=((t2 * 9)/5 + 32);        Serial.print("fhrn: ");        Serial.println(t3);        //break;
            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);
///////////////////////////////////////////////////////////////////////////////

// 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\": xxxxxxx, \"slave_id\": x"; //here you have to change device_id that comes from thingsio.ai also slave_id...         PostValue = PostValue + ",\"dts\":" +timestamp;   PostValue = PostValue +",\"data\":{\"celc\":" + t2 +",\"fahr\":" + t3 +"}"+"}";      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: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");  //change it from your account of thingsio.ai (in sample code you will get this)  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);
}
}