About_IOT.md

IOT

Internet - Connects Humans
IOT - Connects Smart Devices
Definition - IOT is a network of smart devices that are connected together for the purpose of exchanging data such as settings and telemetry over the internet

Communication Models

1. Request & Response Model –
   

• it follows Client-Server Architecture
• Client request info from server
• the server categorizez the request and fetches the data from database
• data is converted in response and sent to client

2. Publisher-Subscriber Model –

• Publisher sends data to broker
• Publisher is unaware of consumers
• Broker accepts data from publisher and sends it to appropriate consumers

3. Push-Pull Model –

• Publisher pushes data in a buffer called Queue
• Consumers pull data from Queue

4. Exclusive Pair –

• Full Duplex Communication i.e. bidirectional communication

Charecteristics of IOT

• Unique Identity : To uniqely identify each other and communicate
• Dynamic Nature : Connected/Disconnected start/Stop On/Off continously
• Self Configuring : Intelligently change settings according to enviroments
• Hetroginity : Muliple protocols and wide compatability

IOT Security Problems

• DOS (Denial of Service) : 1 attacker flooding server with garbage request
• DDOS (Distributed Denial of Service) : Attacker floods server with botnet army
• Unauthorized Access : Fraud user gets access to IOT system
• Information Manipulation : Fraud User starts manipulating data
• Information Manipulation : Attcker gets access to location where data is stored by IOT devices

REST vs Web Socket

REST

• stateless
• each request involves settimng up a new TCP connection

Web Socket

• statefull
• single TCP connection