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How many messages types are there in CoAP?

April 15, 2024 by rawan239

2

5

3

4

The correct answer is C. There are 3 message types in CoAP:

CON (confirmed request)
ACK (acknowledgement)
RST (reset)

A CON message is

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a request message that expects an ACK message in response. An ACK message is a response message that acknowledges the receipt of a CON message. A RST message is a message that indicates that the receiver of a message is not able to process the message.

CoAP is a lightweight, RESTful application protocol for constrained devices and low-power networks. It is designed to be efficient and reliable in resource-constrained environments. CoAP is an IETF standard (RFC 7252).

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