COAP vs MQTT | Difference between COAP and MQTT protocols
This page compares COAP vs MQTT and mentions difference between COAP and MQTT protocols.
COAP Protocol
• CoAP stands for Constrained Application Protocol.
• It is specified in RFC 7252.It is open IETF standard
• It is very efficient RESTful protocol.
• Easy to proxy to/from HTTP.
• It is Embedded web transfer protocol (coap://)
• It uses asynchronous transaction model.
• UDP is binding with reliability and multicast support.
• GET, POST, PUT and DELETE methods are used.
• URI is supported.
• It uses small and simple 4 byte header.
• Supports binding to UDP, SMS and TCP.
• DTLS based PSK, RPK and certificate security is used.
• uses subset of MIME types and HTTP response codes.
• Uses built in discovery mechanism.
Refer CoAP Protocol>> for more information.
MQTT Protocol
The figure-1 depicts simple MQTT protocol architecture (broker based).
Following are the features of MQTT protocol:
• It is over TCP.
• It uses SSL/TLS for security.
• There are many messages used in MQTT protocol such as CONNECT, PUBLISH, SUBSCRIBE, DISCONNECT etc.
• Username/Password is used in 'connect' message.
• It encrypts payload i.e. it is payload agnostic.
• 1883 port is used by MQTT protocol.
Refer tutorial on MQTT Protocol>> for more information.
Following table compares various features of COAP vs MQTT and tabulates difference between CoAP and MQTT protocols.
| Features | CoAP | MQTT |
|---|---|---|
| Full Form | Constrained Application Protocol | Message Queue Telemetry Transport |
| Model used for communication | Request-Response, Publish-Subscribe | Publish-Subscribe |
| RESTful | Yes | No |
| Transport layer | Preferably UDP, TCP can also be used. | Preferably TCP, UDP can also be used (MQTT-S). |
| Header Size | 4 Bytes | 2 Bytes |
| Number of message types used | 4 | 16 |
| Messaging | Asynchronous & Synchronous | Asynchronous |
| Application Reliability | 2 Levels | 3 Levels |
| Security | IPSEC or DTLS | Not defined in the standard |
| Intermediaries | YES | YES (MQTT-S) |
| LLN Suitability (thousand nodes) | Excellent | Fair |
| Application success stories | Utility Field Area Networks | Extending enterprise messaging into IoT applications |
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Difference between CoAP vs MQTT vs HTTP, MQTT vs DDS, MQTT vs REST, MQTT vs SMQTT
CoAP vs HTTP >> MQTT vs HTTP >> MQTT vs REST >> MQTT vs DDS >> MQTT vs SMQTT >>
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