NTP server

first, get NTP client library for ESP32, and save in Arduino library folder 

https://randomnerdtutorials.com/esp32-ntp-client-date-time-arduino-ide/

Then set time, GMT +5.5 to view Sri Lanka time 

Then upload the code and view serial monitor using Arduino IDE, that should indicate as follows 

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

#include <WiFi.h>

#include <NTPClient.h>

#include <WiFiUdp.h>

// Replace with your network credentials

const char* ssid     = "Your SSD"; // 

const char* password = "Your Password";

// Define NTP Client to get time

WiFiUDP ntpUDP;

NTPClient timeClient(ntpUDP);

// Variables to save date and time

String formattedDate;

String dayStamp;

String timeStamp;

void setup() {

  // Initialize Serial Monitor

  Serial.begin(115200);

  Serial.print("Connecting to ");

  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {

    delay(500);

    Serial.print(".");

  }

  // Print local IP address and start web server

  Serial.println("");

  Serial.println("WiFi connected.");

  Serial.println("IP address: ");

  Serial.println(WiFi.localIP());

// Initialize a NTPClient to get time

  timeClient.begin();

  // Set offset time in seconds to adjust for your timezone, for example:

  // GMT +1 = 3600

  // GMT +8 = 28800

  // GMT -1 = -3600

  // GMT 0 = 0

  timeClient.setTimeOffset(19800);

}

void loop() {

  while(!timeClient.update()) {

    timeClient.forceUpdate();

  }

  // The formattedDate comes with the following format:

  // 2018-05-28T16:00:13Z

  // We need to extract date and time

  formattedDate = timeClient.getFormattedDate();

  Serial.println(formattedDate);

  // Extract date

  int splitT = formattedDate.indexOf("T");

  dayStamp = formattedDate.substring(0, splitT);

  Serial.print("DATE: ");

  Serial.println(dayStamp);

  // Extract time

  timeStamp = formattedDate.substring(splitT+1, formattedDate.length()-1);

  Serial.print("HOUR: ");

  Serial.println(timeStamp);

  delay(1000);

}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Unix Time 

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

#include <TimeLib.h>

unsigned long offset_days = 3;    // 3 days
unsigned long t_unix_date1, t_unix_date2;

void setup() {
  Serial.begin(115200);
  t_unix_date1 = 1564398600;
  Serial.print("t_unix_date1: ");
  Serial.println(t_unix_date1);
  offset_days = offset_days * 86400;    // convert number of days to seconds
  t_unix_date2 = 1564398600 + offset_days;
  Serial.print("t_unix_date2: ");
  Serial.println(t_unix_date2);
  printf("Date1: %4d-%02d-%02d %02d:%02d:%02d\n", year(t_unix_date1), month(t_unix_date1), day(t_unix_date1), hour(t_unix_date1), minute(t_unix_date1), second(t_unix_date1));
  printf("Date2: %4d-%02d-%02d %02d:%02d:%02d\n", year(t_unix_date2), month(t_unix_date2), day(t_unix_date2), hour(t_unix_date2), minute(t_unix_date2), second(t_unix_date2));
}

void loop() {



}

OLED interface with ESP8266

This code used to interface with OLED, 

bit map code was generated using http://javl.github.io/image2cpp/ 

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

 #include <SPI.h>

#include <Wire.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels

#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for SSD1306 display connected using software SPI (default case):

#define     OLED_MOSI        D7

#define     OLED_CLK          D5

#define     OLED_DC             D2

#define     OLED_CS             D8

#define     OLED_RESET      D3

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,

  OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);

const unsigned char myBitmap [] PROGMEM = {

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x07, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xf1, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x07, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x07, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x80, 0x03, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0x80, 0x07, 0x80, 0x00, 0x00, 0x00, 0x00, 0x60, 0x03, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00, 0x30, 0x03, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xf8, 0x00, 0x3f, 0x80, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x01, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xf0, 0x00, 0x3f, 0x80, 0x00, 0x00, 0x00, 0x00, 0x06, 0x01, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xc0, 0x00, 0x1f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x81, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc1, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0x00, 0x00, 0x01, 0x80, 0xc0, 0x0e, 0x00, 0x0e, 0x00, 0x61, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xfe, 0x00, 0x00, 0x7f, 0x87, 0xf8, 0x7f, 0xc0, 0xff, 0xf8, 0x71, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xfc, 0x00, 0x00, 0x7f, 0x9f, 0xfc, 0xff, 0xe3, 0xf0, 0xf8, 0x31, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xf8, 0x00, 0x00, 0x1f, 0x90, 0xff, 0x07, 0xf3, 0xe0, 0x70, 0x19, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xf8, 0x00, 0x00, 0x1f, 0x80, 0x7e, 0x03, 0xf3, 0xf0, 0x20, 0x19, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xfc, 0x00, 0x00, 0x1f, 0x80, 0x7e, 0x03, 0xf3, 0xf8, 0x00, 0x1d, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xfc, 0x00, 0x00, 0x1f, 0x80, 0x7e, 0x03, 0xf1, 0xff, 0x80, 0x1f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xfe, 0x00, 0x00, 0x1f, 0x80, 0x7e, 0x03, 0xf0, 0xff, 0xe0, 0x1f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0x80, 0x00, 0x1f, 0x80, 0x7e, 0x03, 0xf0, 0x1f, 0xf8, 0x1f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xc0, 0x00, 0x1f, 0x80, 0x7e, 0x03, 0xf0, 0x03, 0xf8, 0x1f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xf0, 0x00, 0x1f, 0x80, 0x7e, 0x03, 0xf0, 0x00, 0xfc, 0x3f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xfc, 0x00, 0x1f, 0x80, 0x7e, 0x03, 0xf0, 0x00, 0xf8, 0x3f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0x00, 0x1f, 0xc0, 0xff, 0x03, 0xf8, 0x01, 0xf8, 0x7f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xc0, 0x7f, 0xf1, 0xff, 0x8f, 0xfe, 0x03, 0xe0, 0xef, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x30, 0x00, 0x00, 0x0e, 0x03, 0x9f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x0f, 0x1f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x3c, 0x3f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x03, 0x00, 0x00, 0x00, 0xf0, 0x3f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0xc0, 0x00, 0x0f, 0x00, 0x7f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x70, 0x00, 0x7c, 0x00, 0x7f, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x1c, 0x0f, 0x80, 0x00, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x07, 0xf0, 0x00, 0x01, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x0f, 0xc1, 0xc0, 0x00, 0x03, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x00, 0xf0, 0x00, 0x07, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x1e, 0x00, 0x0f, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x07, 0x80, 0x0f, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x01, 0xf0, 0x3f, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x7e, 0x7f, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x03, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x07, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x07, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff

};

void setup() {

  Serial.begin(9600);

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally

  if(!display.begin(SSD1306_SWITCHCAPVCC)) {

    Serial.println(F("SSD1306 allocation failed"));

    for(;;); // Don't proceed, loop forever

  }

  // Show initial display buffer contents on the screen --

  // the library initializes this with an Adafruit splash screen.

  //display.display();

  //delay(2000); // Pause for 2 seconds

  // Clear the buffer

  display.clearDisplay();

  testscrolltext();

  // Clear the buffer.

  display.clearDisplay();

  // Display bitmap

  display.drawBitmap(0, 0,  myBitmap, 128, 64, BLACK, WHITE);

  display.display();

}

void loop() {

}

void testscrolltext(void) {

  display.clearDisplay();

  display.setTextSize(2); // Draw 2X-scale text

  display.setTextColor(WHITE);

  display.setCursor(0, 0);

  display.println(F("Asanka"));

  display.println(F("Lakmal"));

  display.println(F("Morawaka"));

  display.display();      // Show initial text

  delay(100);

  // Scroll in various directions, pausing in-between:

  display.startscrollright(0x00, 0x0F);

  delay(2000);

  display.stopscroll();

  delay(1000);

  display.startscrollleft(0x00, 0x0F);

  delay(2000);

  display.stopscroll();

  delay(1000);

  display.startscrolldiagright(0x00, 0x07);

  delay(2000);

  display.startscrolldiagleft(0x00, 0x07);

  delay(2000);

  display.stopscroll();

  delay(1000);

}

IOT project ( ESP8266 / MQTT- Rpi / Node-red- dashboard )

1. install putty to communicate with pi using SSH, put Host Name IP which is IP obtain by the PI when it connected 

 

2. Then install Node-red on your pi, https://randomnerdtutorials.com/getting-started-with-node-red-on-raspberry-pi/

pi@raspberry:~ $ bash <(curl -sL https://raw.githubusercontent.com/node-red/raspbian-deb-package/master/resources/update-nodejs-and-nodered)

pi@raspberry:~ $ sudo systemctl enable nodered.service

pi@raspberry:~ $ sudo reboot

test your installation http://YOUR_RPi_IP_ADDRESS:1880

3. Play with your Node-red dashboard https://randomnerdtutorials.com/getting-started-with-node-red-dashboard/

4. install Mosquitto MQTT on Pi. https://randomnerdtutorials.com/how-to-install-mosquitto-broker-on-raspberry-pi/

pi@raspberry:~ $ sudo apt update

pi@raspberry:~ $ sudo apt install -y mosquitto mosquitto-clients

pi@raspberry:~ $ sudo systemctl enable mosquitto.service

test your installation > pi@raspberry:~ $ mosquitto -v

5. test mosquitto server https://randomnerdtutorials.com/testing-mosquitto-broker-and-client-on-raspbbery-pi/

6. prepare Arduino IDE for ESP8266

File>preperences>Additional Board Manager URLs,

https://dl.espressif.com/dl/package_esp32_index.json, http://arduino.esp8266.com/stable/package_esp8266com_index.json

Tools>MAnage Libries> 

add ESP8266, Then install following libraries 

7. Install PubSubClient library 

8. Install DHT library 

9. Install Adafruit_sensor library 

Then use the following code. 

#include <ESP8266WiFi.h>

#include <PubSubClient.h>

#include "DHT.h"

// Uncomment one of the lines bellow for whatever DHT sensor type you're using!

#define DHTTYPE DHT11   // DHT 11

//#define DHTTYPE DHT21   // DHT 21 (AM2301)

//#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

// Change the credentials below, so your ESP8266 connects to your router

const char* ssid = "Dialog 4G";

const char* password = "YJNHQ102RD8";

// Change the variable to your Raspberry Pi IP address, so it connects to your MQTT broker

const char* mqtt_server = "192.168.0.100";

// Initializes the espClient. You should change the espClient name if you have multiple ESPs running in your home automation system

WiFiClient espClient;

PubSubClient client(espClient);

// DHT Sensor - GPIO 5 = D1 on ESP-12E NodeMCU board

const int DHTPin = 5;

// Lamp - LED - GPIO 4 = D2 on ESP-12E NodeMCU board

const int lamp = 4;

// Lamp - LED - GPIO 12 = D6 on ESP-12E NodeMCU board

const int lamp1 = 12 ;

// Initialize DHT sensor.

DHT dht(DHTPin, DHTTYPE);

// Timers auxiliar variables

long now = millis();

long lastMeasure = 0;

// Don't change the function below. This functions connects your ESP8266 to your router

void setup_wifi() {

  delay(10);

  // We start by connecting to a WiFi network

  Serial.println();

  Serial.print("Connecting to ");

  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {

    delay(500);

    Serial.print(".");

  }

  Serial.println("");

  Serial.print("WiFi connected - ESP IP address: ");

  Serial.println(WiFi.localIP());

}

// This functions is executed when some device publishes a message to a topic that your ESP8266 is subscribed to

// Change the function below to add logic to your program, so when a device publishes a message to a topic that 

// your ESP8266 is subscribed you can actually do something

void callback(String topic, byte* message, unsigned int length) {

  Serial.print("Message arrived on topic: ");

  Serial.print(topic);

  Serial.print(". Message: ");

  String messageTemp;

  

  for (int i = 0; i < length; i++) {

    Serial.print((char)message[i]);

    messageTemp += (char)message[i];

  }

  Serial.println();

  // Feel free to add more if statements to control more GPIOs with MQTT

  if(topic=="room/lamp1"){

      Serial.print("Changing Room lamp1 to ");

      if(messageTemp == "on"){

        digitalWrite(lamp1, HIGH);

        Serial.print("On");

      }

      else if(messageTemp == "off"){

        digitalWrite(lamp1, LOW);

        Serial.print("Off");

      }

  }

  Serial.println();

  // If a message is received on the topic room/lamp, you check if the message is either on or off. Turns the lamp GPIO according to the message

  if(topic=="room/lamp"){

      Serial.print("Changing Room lamp to ");

      if(messageTemp == "on"){

        digitalWrite(lamp, HIGH);

        Serial.print("On");

      }

      else if(messageTemp == "off"){

        digitalWrite(lamp, LOW);

        Serial.print("Off");

      }

  }

  Serial.println();

}

// This functions reconnects your ESP8266 to your MQTT broker

// Change the function below if you want to subscribe to more topics with your ESP8266 

void reconnect() {

  // Loop until we're reconnected

  while (!client.connected()) {

    Serial.print("Attempting MQTT connection...");

    // Attempt to connect

    /*

     YOU MIGHT NEED TO CHANGE THIS LINE, IF YOU'RE HAVING PROBLEMS WITH MQTT MULTIPLE CONNECTIONS

     To change the ESP device ID, you will have to give a new name to the ESP8266.

     Here's how it looks:

       if (client.connect("ESP8266Client")) {

     You can do it like this:

       if (client.connect("ESP1_Office")) {

     Then, for the other ESP:

       if (client.connect("ESP2_Garage")) {

      That should solve your MQTT multiple connections problem

    */

    if (client.connect("ESP8266Client")) {

      Serial.println("connected");  

      // Subscribe or resubscribe to a topic

      // You can subscribe to more topics (to control more LEDs in this example)

      client.subscribe("room/lamp");

      client.subscribe("room/lamp1");

    } else {

      Serial.print("failed, rc=");

      Serial.print(client.state());

      Serial.println(" try again in 5 seconds");

      // Wait 5 seconds before retrying

      delay(5000);

    }

  }

}

// The setup function sets your ESP GPIOs to Outputs, starts the serial communication at a baud rate of 115200

// Sets your mqtt broker and sets the callback function

// The callback function is what receives messages and actually controls the LEDs

void setup() {

  pinMode(lamp, OUTPUT);

   pinMode(lamp1, OUTPUT);

  

  dht.begin();

  

  Serial.begin(115200);

  setup_wifi();

  client.setServer(mqtt_server, 1883);

  client.setCallback(callback);

}

// For this project, you don't need to change anything in the loop function. Basically it ensures that you ESP is connected to your broker

void loop() {

  if (!client.connected()) {

    reconnect();

  }

  if(!client.loop())

    client.connect("ESP8266Client");

  now = millis();

  // Publishes new temperature and humidity every 30 seconds

  if (now - lastMeasure > 30000) {

    lastMeasure = now;

    // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)

    float h = dht.readHumidity();

    // Read temperature as Celsius (the default)

    float t = dht.readTemperature();

    // Read temperature as Fahrenheit (isFahrenheit = true)

    float f = dht.readTemperature(true);

    // Check if any reads failed and exit early (to try again).

    if (isnan(h) || isnan(t) || isnan(f)) {

      Serial.println("Failed to read from DHT sensor!");

      return;

    }

    // Computes temperature values in Celsius

    float hic = dht.computeHeatIndex(t, h, false);

    static char temperatureTemp[7];

    dtostrf(hic, 6, 2, temperatureTemp);

    

    // Uncomment to compute temperature values in Fahrenheit 

    // float hif = dht.computeHeatIndex(f, h);

    // static char temperatureTemp[7];

    // dtostrf(hic, 6, 2, temperatureTemp);

    

    static char humidityTemp[7];

    dtostrf(h, 6, 2, humidityTemp);

    // Publishes Temperature and Humidity values

    client.publish("room/temperature", temperatureTemp);

    client.publish("room/humidity", humidityTemp);

    

    Serial.print("Humidity: ");

    Serial.print(h);

    Serial.print(" %\t Temperature: ");

    Serial.print(t);

    Serial.print(" *C ");

    Serial.print(f);

    Serial.print(" *F\t Heat index: ");

    Serial.print(hic);

    Serial.println(" *C ");

    // Serial.print(hif);

    // Serial.println(" *F");

  }

}