Basics of Networking and Communication Protocols, Sensor Networks,Introduction to IoT Security and Privacy Fundamentals.

Basics of Networking and Communication Protocols, Sensor Networks,Introduction to IoT Security and Privacy Fundamentals.

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  Internet of Things(IOT) Basicsof Networking and Communication Protocols, Sensor Networks, Introduction to IoT Security and Privacy Fundamentals.
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  UNIT – I Introductionto IoT and Sensor Networks Introduction to Internet of Things (IoT), Characteristics and Applications of IoT, IoT Architecture and Reference Models (IETF, ITU-T) Physical Design of IoT: Devices, Gateways, and Data Centers Functional Blocks of IoT: Sensing, Actuation, Communication, Enabling Technologies: RFID, Wireless Sensor Networks, Nanotechnology Basics of Networking and Communication Protocols: MQTT, CoAP, ZigBee, HTTP Sensor Networks: Types, Topologies, and Protocols Introduction to IoT Security and Privacy Fundamentals.
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  Basics of Networkingand Communication Protocols: MQTT, CoAP, ZigBee, HTTP Communication protocols define the rules that allow IoT devices to exchange data reliably and efficiently. Different protocols are designed for different purposes, such as low power consumption, high speed, or web communication. Networking Basics in IoT IoT networking enables communication between sensors, devices, gateways, cloud servers, and user applications. Basic IoT Communication Model +--------------+ +--------------+ +-------------+ +---------------+ | Sensors & | --> | Gateway / | --> | Cloud / | --> | User | | Actuators | | Router | | Server | | Application| +--------------+ +--------------+ +------------+ +---------------+
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  Types of Communication Device-to-Device(D2D): – Devices communicate directly. – Example: Bluetooth between a phone and a smartwatch. Device-to-Cloud (D2C): – Devices send data directly to the cloud. – Example: Smart thermostat sending temperature data. Device-to-Gateway (D2G): – Devices communicate through a gateway. – Example: ZigBee sensors connected to a home gateway. Back-End Data Sharing: – Cloud services share IoT data with other applications. – Example: Smart city traffic data shared with navigation apps.
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  1. MQTT (MessageQueuing Telemetry Transport) MQTT is a lightweight messaging protocol designed for low- bandwidth and low-power IoT devices. It follows the Publish/Subscribe communication model. MQTT Architecture +------------------+ | MQTT Broker | +------------------+ / | / | Publisher Publisher Subscriber (Sensor) (Camera) (Mobile App)
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  Working Publisher sends datato a topic. Broker receives the message. Broker forwards the message to all subscribers of that topic. Applications Smart homes Healthcare monitoring Agriculture Industrial IoT Vehicle tracking
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  Advantages Fast communication Low powerconsumption Scalable Easy implementation Suitable for remote monitoring Disadvantages Requires a broker Not suitable for large file transfer
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  2. CoAP (ConstrainedApplication Protocol) CoAP is a lightweight web transfer protocol developed for constrained devices and low-power networks. It works over UDP and follows a Client/Server (Request/Response) model. CoAP Architecture +-------------+ Request +----------------+ | CoAP | --------------------> | CoAP | | Client | | Server | | (Sensor) | <-------------------- | (Gateway) | +------------+ Response +---------------+
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  Methods GET – Readdata POST – Create data PUT – Update data DELETE – Remove data Applications Smart lighting Smart meters Environmental monitoring Home automation
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  Advantages Low power consumption Smallmessage size Fast communication Suitable for sensor networks Disadvantages Less reliable than TCP-based protocols Limited security compared to HTTP
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  3. ZigBee ZigBee isa low-power wireless communication protocol based on the IEEE 802.15.4 standard. It is designed for short- range communication in IoT networks. ZigBee Network Coordinator | ----------------------------- | | | Router Router Router | | | End Dev End Dev End Dev
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  Device Types Coordinator – Startsand manages the network. – Only one coordinator in a ZigBee network. Router – Extends network coverage. – Forwards data between devices. End Device – Sensor or actuator. – Communicates through a router or coordinator. Applications Home automation Smart lighting Industrial monitoring Smart energy meters
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  4. HTTP (HyperTextTransfer Protocol) HTTP is the standard protocol used for communication between web browsers, servers, and IoT devices. It follows a Client/Server (Request/Response) model and works over TCP. HTTP Communication +----------------+ HTTP Request +-----------------+ | Client | ----------------------> | Web Server | | (Browser / | | | | IoT Device) | <---------------------- | | +-----------------+ HTTP Response +------------------+
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  HTTP Methods GET –Retrieve data POST – Send data PUT – Update data DELETE – Delete data Applications Web-based IoT dashboards Smart home control via browser Cloud communication REST APIs
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  Advantages Widely supported Reliable communication Easyintegration with web services Disadvantages Higher bandwidth usage More overhead than MQTT and CoAP Higher power consumption
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  Real-World Examples Protocol Example MQTT Temperaturesensor publishing data to a cloud dashboard CoAP Smart light controlled from a mobile app ZigBee Smart bulbs and home automation devices communicating in a mesh network HTTP Weather station sending data to a web server using a REST API
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  Sensor Networks: Types,Topologies, and Protocols A Sensor Network is a collection of interconnected sensor nodes that monitor physical or environmental conditions (such as temperature, humidity, pressure, light, or motion) and transmit the collected data to a central location for processing and analysis. Sensor networks are a fundamental part of Internet of Things (IoT) systems and are widely used in smart homes, healthcare, agriculture, industrial automation, and environmental monitoring.
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  Basic Architecture ofa Sensor Network
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  Types of SensorNetworks 1. Wireless Sensor Network (WSN) Uses wireless communication. Sensor nodes communicate without cables. Common protocols: ZigBee, Wi-Fi, Bluetooth. Applications Environmental monitoring Smart agriculture Smart homes Advantages Easy installation Low maintenance Flexible deployment
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  2. Wired SensorNetwork Uses cables for communication. Provides high reliability and speed. Applications Industrial automation Factory monitoring Advantages Reliable communication High data transfer rate Disadvantages Expensive installation Limited flexibility
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  3. Mobile SensorNetwork Sensor nodes can move from one place to another. Applications Military surveillance Disaster management Wildlife monitoring 4. Underground Sensor Network Sensors are deployed underground. Applications Soil monitoring Mining Pipeline monitoring
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  5. Underwater SensorNetwork Sensors are placed underwater. Applications Ocean monitoring Water quality analysis Marine research 6. Multimedia Sensor Network Uses cameras and microphones along with traditional sensors. Applications Video surveillance Traffic monitoring Smart security systems
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  Sensor Network Topologies Anetwork topology defines how sensor nodes are connected. 1. Star Topology Features All sensor nodes communicate directly with the gateway. Advantages Easy to install Simple management Failure of one node does not affect others Disadvantages Gateway failure stops the entire network Limited communication range
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  2. Bus Topology Features Alldevices share a common communication line. Advantages Low cost Simple design Disadvantages Cable failure affects the network Difficult troubleshooting
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  3. Ring Topology Features Eachnode connects to two neighboring nodes. Advantages Equal communication opportunity Disadvantages Failure of one node may affect communication
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  4. Mesh Topology Features Everynode communicates with multiple nodes. Advantages Highly reliable Self-healing No single point of failure Disadvantages Higher cost Complex implementation
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  5. Tree Topology Features Hierarchicalstructure. Advantages Easy expansion Suitable for large networks Disadvantages Parent node failure affects child nodes
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  Sensor Network CommunicationProtocols Protocol Range Data Rate Power Consumption Applications ZigBee 10–100 m 250 kbps Low Home automation Bluetooth Low Energy (BLE) 10–100 m Up to 2 Mbps Very Low Wearables Wi-Fi 50–100 m High High Smart homes LoRaWAN Up to 15 km Low Very Low Smart agriculture NB-IoT Long range Moderate Low Smart cities MQTT Internet Moderate Low Cloud messaging CoAP Internet Moderate Very Low Sensor communication
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  Introduction to IoTSecurity and Privacy Fundamentals As IoT devices collect and exchange sensitive information, security and privacy are essential to protect devices, users, and data from cyber threats. IoT Security: Protecting IoT devices, networks, and data from unauthorized access, attacks, and misuse. IoT Privacy: Ensuring that users' personal and sensitive information is collected, stored, and shared only with proper authorization.
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  Security Requirements 1. Confidentiality Ensuresonly authorized users can access data. Example: Encrypting health records. 2. Integrity Ensures data is not altered during transmission. 3. Availability Ensures systems remain operational whenever needed. 4. Authentication Verifies the identity of users and devices. 5. Authorization Grants appropriate permissions after authentication.