IoT Communication Models
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Questions and Answers

What is the primary function of a broker in a messaging system?

  • To accept data from publishers and send it to appropriate consumers (correct)
  • To manage the queues for data storage
  • To establish a direct connection between publishers and consumers
  • To act as a buffer for messages

    • In the Push-Pull model, what is the purpose of the queue?

  • To establish a direct connection between the publisher and consumer
  • To store the data permanently
  • To reduce the rate of data push or pull
  • To decouple the messaging between the producer and consumer (correct)

    • What is the characteristic of the Exclusive Pair model?

  • It is a stateless connection model
  • It is a unidirectional model
  • It is a bi-directional model with full-duplex communication (correct)
  • It uses queues for data storage

    • What is the relationship between the publisher and consumer in the Push-Pull model?

    <p>They are not aware of each other</p> Signup and view all the answers

    What is the role of the server in the Exclusive Pair model?

    <p>To keep a record of all open connections</p> Signup and view all the answers

    What is the primary purpose of understanding various IoT devices' communication with each other?

    <p>To understand operational perception</p> Signup and view all the answers

    What is the key characteristic of the Request & Response Model in IoT communication?

    <p>It is a stateless model, handling each request independently</p> Signup and view all the answers

    What is the role of the broker in the Publisher-Subscriber Model?

    <p>To manage the topics and receive data from publishers</p> Signup and view all the answers

    What is the main difference between the Request & Response Model and the Publisher-Subscriber Model?

    <p>The Request &amp; Response Model has a one-to-one communication, while the Publisher-Subscriber Model has a one-to-many communication</p> Signup and view all the answers

    What is the primary function of the publisher in the Publisher-Subscriber Model?

    <p>To send data to the broker</p> Signup and view all the answers

    Study Notes

    Communication Models in IoT

    • In IoT, communication models enable devices to communicate with each other, facilitating circulatory intelligence.

    Request & Response Model

    • A client-server architecture where the client requests information from the server in encoded format.
    • The server categorizes the request, fetches data from the database, and sends the response to the client in encoded format.
    • This model is stateless, meaning each request is independently handled and no data is retained between requests.

    Publisher-Subscriber Model

    • Comprises three entities: Publishers, Brokers, and Consumers.
    • Publishers send data to topics managed by the Broker, without knowing the Consumers.
    • The Broker accepts data from Publishers and sends it to the appropriate Consumers.
    • Consumers subscribe to topics managed by the Broker.

    Push-Pull Model

    • Constitutes data publishers, data consumers, and data queues.
    • Publishers publish messages and push them into the queue, while Consumers pull the data out of the queue.
    • The queue acts as a buffer, decoupling the messaging between the producer and consumer, and helping in situations where there is a mismatch between the rate of push or pull of data.

    Exclusive Pair

    • A bi-directional model with full-duplex communication between the client and server.
    • The connection remains open until the client sends a request to close the connection.
    • The Server has a record of all open connections, making it a state-full connection model.
    • WebSocket-based communication API is fully based on this model.

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    Description

    Learn about the different communication models used in IoT devices, including request and response models, and understand how they enable seamless communication between devices.

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