Unit III – Basics of IoT Networking

 

Unit III – Basics of IoT Networking (Simple English Notes)

1. Basics of IoT Networking

Internet of Things (IoT) is a network of physical devices connected through the internet that collect and exchange data.

Examples:

  • Smart watch
  • Smart home devices
  • Smart agriculture sensors
  • Smart vehicles

Main functions of IoT networking:

  • Connect devices
  • Transfer data
  • Process information
  • Control devices remotely

Basic flow:

Sensors → Network → Cloud/Server → User Application

2. IoT Components

IoT mainly consists of four components:

1. Sensors/Devices

  • Collect information from surroundings
  • Example:
    • Temperature sensor
    • Motion sensor
    • Humidity sensor

2. Connectivity

  • Connects devices with internet
  • Technologies:
    • Wi-Fi
    • Bluetooth
    • ZigBee
    • RFID

3. Data Processing

  • Processes collected data
  • Uses cloud or local servers

4. User Interface

  • Shows output to users
  • Example:
    • Mobile app
    • Web dashboard

3. Functional Components of IoT

Functional components are the important parts that help IoT work properly.

a) Device Component

  • Sensors and actuators

b) Communication Component

  • Transfers data between devices

c) Service Component

  • Provides services like monitoring and analytics

d) Management Component

  • Manages devices and system performance

e) Security Component

  • Protects data and devices

4. IoT Service Oriented Architecture (SOA)

SOA means designing IoT using services.

Different devices provide services and communicate with each other.

Layers of IoT SOA:

1. Sensing Layer

  • Collects data from sensors

2. Network Layer

  • Transfers data

3. Service Layer

  • Processes and manages services

4. Interface Layer

  • Allows user interaction

Advantages:

  • Reusable services
  • Better flexibility
  • Easy integration

5. IoT Challenges

1. Security

  • Data can be hacked

2. Privacy

  • Personal information may leak

3. Connectivity

  • Network issues can affect devices

4. Power Consumption

  • Sensors use battery

5. Data Management

  • Huge amount of data generated

6. Compatibility

  • Different devices may not work together

7. Scalability

  • Difficult to manage many devices

6. 6LoWPAN

Full form:

IPv6 over Low Power Wireless Personal Area Networks

It allows small devices to communicate using IPv6.

Features:

  • Low power consumption
  • Supports IPv6
  • Small packet size
  • Used in sensor networks

Applications:

  • Smart homes
  • Healthcare
  • Industrial IoT

7. IEEE 802.15.4

It is a standard for low-rate wireless communication.

Used in:

  • ZigBee
  • Wireless sensor networks

Features:

  • Low power usage
  • Low cost
  • Small data rate
  • Supports short-distance communication

Advantages:

  • Long battery life
  • Reliable communication

8. ZigBee and its Types

ZigBee is a wireless communication technology based on IEEE 802.15.4.

Used for short-distance communication.

Features:

  • Low power consumption
  • Low cost
  • Secure communication
  • Supports mesh network

ZigBee Device Types:

1. ZigBee Coordinator (ZC)

  • Main controller
  • Starts network

2. ZigBee Router (ZR)

  • Transfers data

3. ZigBee End Device (ZED)

  • Performs sensing tasks

ZigBee Network Types:

a) Star Topology

  • All devices connect to one coordinator

b) Mesh Topology

  • Devices communicate with each other

c) Tree Topology

  • Hierarchical structure

9. RFID Features

Full form:

Radio Frequency Identification

Used to identify objects through radio waves.

Features:

  • Wireless communication
  • Fast identification
  • No physical contact required
  • Stores data electronically

Components:

  • RFID Tag
  • RFID Reader
  • Antenna
  • Database

10. RFID Working Principle

Working steps:

  1. Reader sends radio signal
  2. RFID tag receives signal
  3. Tag sends stored information
  4. Reader receives data
  5. Data processed in system

Applications:

  • Attendance systems
  • Inventory management
  • Library management
  • Toll collection
  • Supply chain tracking

11. NFC (Near Field Communication)

NFC is a short-range wireless communication technology.

Communication distance:
Approximately 4–10 cm

Features:

  • Very short range
  • Secure communication
  • Fast connection

Applications:

  • Mobile payments
  • Smart cards
  • Access control
  • Data sharing

12. Bluetooth

Bluetooth is a wireless technology used for short-range communication.

Features:

  • Low power usage
  • Low cost
  • Supports voice and data transfer

Versions:

  • Bluetooth Classic
  • Bluetooth Low Energy (BLE)

Applications:

  • Headphones
  • Smart watches
  • File transfer
  • IoT devices

13. Wireless Sensor Networks (WSN)

WSN is a network of sensors that monitor environmental conditions.

Sensors collect data and send it to a central system.

Components:

  • Sensor nodes
  • Gateway
  • Base station

Features:

  • Self-organizing
  • Low power
  • Supports real-time monitoring

Applications of WSN:

  1. Environmental monitoring
  2. Military applications
  3. Smart agriculture
  4. Healthcare monitoring
  5. Industrial monitoring
  6. Home automation
  7. Disaster management

Important Short Notes for Exams

  • 6LoWPAN: IPv6 communication for low power devices.
  • IEEE 802.15.4: Standard for low-rate wireless communication.
  • ZigBee: Low-power wireless technology used in IoT.
  • RFID: Uses radio waves for object identification.
  • NFC: Short-range communication up to 10 cm.
  • Bluetooth: Short-range wireless data transfer technology.
  • WSN: Group of sensors connected for monitoring tasks.

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