10 Questions
What is the primary function of a broker in a messaging system?
To accept data from publishers and send it to appropriate consumers
In the Push-Pull model, what is the purpose of the queue?
To decouple the messaging between the producer and consumer
What is the characteristic of the Exclusive Pair model?
It is a bi-directional model with full-duplex communication
What is the relationship between the publisher and consumer in the Push-Pull model?
They are not aware of each other
What is the role of the server in the Exclusive Pair model?
To keep a record of all open connections
What is the primary purpose of understanding various IoT devices' communication with each other?
To understand operational perception
What is the key characteristic of the Request & Response Model in IoT communication?
It is a stateless model, handling each request independently
What is the role of the broker in the Publisher-Subscriber Model?
To manage the topics and receive data from publishers
What is the main difference between the Request & Response Model and the Publisher-Subscriber Model?
The Request & Response Model has a one-to-one communication, while the Publisher-Subscriber Model has a one-to-many communication
What is the primary function of the publisher in the Publisher-Subscriber Model?
To send data to the broker
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.
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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