Internet Of Things
Types of Communication Model :
Request & Response Model –
This model follows a client-server architecture.
The client, when required, requests the information from the server. This
request is usually in the encoded format.
This model is stateless since the data between the requests is not retained and
each request is independently handled.
The server Categories the request, and fetches the data from the database and
its resource representation. This data is converted to response and is
transferred in an encoded format to the client. The client, in turn, receives the
response.
On the other hand — In Request-Response communication model client sends
a request to the server and the server responds to the request. When the
server receives the request it decides how to respond, fetches the data
retrieves resources, and prepares the response, and sends it to the client.
Example: Sending a spreadsheet to the printer — the spreadsheet program is
the client.
Publisher-Subscriber Model –
This model comprises three entities: Publishers, Brokers, and Consumers.
Publishers are the source of data. It sends the data to the topic which are
managed by the broker. They are not aware of consumers.
Consumers subscribe to the topics which are managed by the broker.
Hence, Brokers responsibility is to accept data from publishers and send it to
the appropriate consumers. The broker only has the information regarding the
consumer to which a particular topic belongs to which the publisher is
unaware of.
Example: Public sensors with a massive base of uniform users that will use the
data.
Push-Pull Model –
