IOT LAB EXP 4.2 PROGRAM

 #include <ESP8266WiFi.h>

 #include "Adafruit_MQTT.h"

 #include "Adafruit_MQTT_Client.h"

 #define WLAN_SSID "ECE_STAFF_ROOM"

  #define WLAN_PASS "specnet@23"

 #define AIO_SERVER "io.adafruit.com"

 #define AIO_SERVERPORT 1883

 #define AIO_USERNAME "ChanduPrasanth"

 #define AIO_KEY "aio_WIaH72ooBeG8RlOfFJxF3a1DRGXV"

 // Create an ESP8266 WiFiClient class to connect to the MQTT server.

 WiFiClient client;

 // Setup the MQTT client class by passing in the WiFi client and

 // MQTT server and login details.

 Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);

 // Setup a feed called iot-lab-exp04-attendance for publishing.

 Adafruit_MQTT_Publish attendanceFeed = Adafruit_MQTT_Publish(&mqtt,

 "ChanduPrasanth/feeds/iot attendance");

 void connectMQTT() {

 Serial.print("Connecting to Adafruit IO...");

 while (mqtt.connected() == false) {

 if (mqtt.connect()) {

 Serial.println("Connected to Adafruit IO !");

 } else {

 Serial.println("Failed to connect to Adafruit IO, retrying in 5s...");

 delay(5000);

 }

 }

 }

 void setup() {

 Serial.begin(115200);

 delay(10);

 Serial.println("Adafruit MQTT demo");

 // Connect to WiFi access point.

 Serial.println(); Serial.println();

 Serial.print("Connecting to ");

 Serial.println(WLAN_SSID);

 WiFi.begin(WLAN_SSID, WLAN_PASS);

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

 delay(500);

 Serial.print(".");

 }

 Serial.println();

 Serial.println("WiFi connected");

 Serial.print("IP address: "); Serial.println(WiFi.localIP());

 connectMQTT();

 }

 

 void loop() {

 // Now we can publish stuff!

 Serial.print("Sending Attendance ");

 Serial.print("...");

 if (mqtt.connected()){

 // Replace your 10-Digit roll number here

 if (! attendanceFeed.publish("22261A0400")) {

 Serial.println("Failed");

 } else {

 Serial.println("OK!");

 }

 }

 delay(5000);

 }