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Difference between COAP and MQTT protocols

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1. Constrained Application Protocol (COAP): The constrained application protocol is a client server-based protocol. With this protocol, the COAP packet can be shared between different client nodes which are commanded by the COAP server. The server is responsible to share the information depending on its logic but has not acknowledged it. This is used with the applications which support the state transfer model. 

2. Message Queuing Telemetry Transport (MQTT): The message query telemetry transport protocol is a communication-based protocol that is used for IoT devices. This protocol is based on the publish-subscribe methodology in which clients receive the information through a broker only to the subscribed topic. A broker is a mediator who categorizes messages into labels before being delivered. 

Difference between COAP and MQTT protocols: 
 

Basis ofCOAPMQTT
AbbreviationConstrained Application ProtocolMessage Queuing Telemetry Transport
Communication TypeIt uses Request-Response model.It uses Publish-Subscribe model
Messaging ModeThis uses both Asynchronous and Synchronous.This uses only Asynchronous
Transport layer protocolThis mainly uses User Datagram protocol(UDP)This mainly uses Transmission Control protocol(TCP)
Header sizeIt has 4 bytes sized headerIt has 2 bytes sized header
RESTful basedYes it uses REST principlesNo it does not uses REST principles
Persistence supportIt does not has such supportIt supports and best used for live data communication
Message LabellingIt provides by adding labels to the messages.It has no such feature.
Usability/SecurityIt is used in Utility area networks and has secured mechanism.It is used in IoT applications and is secure
EffectivenessEffectiveness in LNN is excellent.Effectiveness in LNN is low.
Communication ModelCommunication model is one-one.Communication model is many-many.

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Last Updated : 02 Sep, 2022
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