IoT Assignment on MQTT Protocol
Report: IoT Assignment on MQTT Protocol
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Iot assignment onMQTT Protocol
Presented by:
ABHIJIT PRADHAN 7473U234001
AKSHAT AJAY NAMDEO 7473U234003
ANSHUMAN SAHU 7473U234004
ARCHITA PATRA 7473U234005
ARIJEET PAUL 7473U234006
ASMAN ASHUTOSH PRADHAN 7473U234007
INSTITUTE OF MATHEMATICS AND APPLICATIONS,BHUBANESWAR
BSC 2ND YEAR (4TH SEMESTER)
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What is MQTT?
MQTT = Message Queuing Telemetry Transport
Lightweight messaging protocol
Designed for low-bandwidth, high-latency, or unreliable networks
Ideal for IoT devices
Components of MQTT
Publisher Sends messages to a topic.
Subscriber Receives messages from a topic.
Broker Manages message distribution (e.g., Mosquitto, AWS IoT
Core, HiveMQ).
Topic A hierarchical string (e.g., home/livingroom/temperature)
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IoT Assignment on MQTT Protocol
that filters messages.
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Key Features of MQTT
Lightweight Small message size (minimal overhead).
Publish-Subscribe Model Decouples senders (publishers) and receivers
(subscribers).
Low Power Consumption Ideal for battery-operated devices.
Reliable Messaging Supports different Quality of Service (QoS) levels.
Scalable Supports thousands of connected devices.
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MQTT Architecture
Client: Publisher or Subscriber (e.g., ESP32)
Broker: Central server (e.g., Mosquitto, HiveMQ)
Topics: Hierarchical channels for messages
Message Flow: Publisher Broker Subscriber
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MQTT Packet Structure
CONNECT, CONNACK: Connection setup
PUBLISH, PUBACK: Sending messages
SUBSCRIBE, SUBACK: Subscribe to topic
PINGREQ, PINGRESP: Keep connection alive
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IoT Assignment on MQTT Protocol
How MQTT Works (Flow)
1. Devices connect to broker
2. Publisher sends message to a topic
3. Broker forwards message to all subscribers
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Setting Up the Demo
Hardware/Software:
ESP32 microcontroller
Arduino IDE
MQTT library (PubSubClient)
Wi-Fi network
Broker: Mosquitto or HiveMQ
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ESP32 Publisher Code (Snippet)
#include <WiFi.h>
#include <PubSubClient.h>
WiFiClient espClient;
PubSubClient client(espClient);
void setup() {
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IoT Assignment on MQTT Protocol
WiFi.begin("SSID", "PASSWORD");
client.setServer("broker.hivemq.com", 1883);
client.connect("ESP32Client");
client.publish("esp32/data", "Hello MQTT");
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Subscriber Code / MQTT Dashboard
Use MQTT.fx, HiveMQ WebSocket client, or custom ESP32 subscriber code
Subscribe to esp32/data
See real-time messages sent from ESP32
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Simulated Example
ESP32 publishing data
MQTT client receiving the data
Real-time communication over broker
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Real-World Use Cases of MQTT
Smart Home Automation (sensors, lights, thermostats,security cameras)
Industrial Monitoring (machine telemetry,monitoring and control of industrial equipments)
Agriculture IoT (soil/moisture sensors for smart farming)
Health Monitoring (wearables promoting remote health monitoring)
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IoT Assignment on MQTT Protocol
Fleet/Vehicle Tracking (smart cities,intelligent transportation system
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Advantages of MQTT
Lightweight and efficient
Low bandwidth usage
Reliable over unstable networks
Scalable for many devices
Bidirectional communication
Scalability
Security
Widely supported in IoT platforms
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Limitations of MQTT
No built-in security (needs TLS)
Broker dependency
Not ideal for real-time video/large data
Message size limitation
Topic management
Interoperability
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Conclusion
MQTT is a lightweight, efficient, and reliable messaging protocol designed for IoT.
Its publish/subscribe model makes it scalable and flexible for real-time communication.
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IoT Assignment on MQTT Protocol
We explored its architecture with the broker, clients, and topics.
The ESP32 demo showed how MQTT enables real-time data transmission with minimal effort.
From smart homes to industrial automation, MQTT powers many modern IoT applications.
Security and broker reliability are key considerations in practical deployments.
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