CoAP Vs. MQTT

1: CoAP uses request-response paradigm.
2: It is a very efficient restful protocol.
3: Easy to proxy to/from HTTP
4: It is an embedded web transfer protocol coap://
5: Preferably UDP, TCP can be used
6: GET, POST, PUT, DELETE methods are used.
7:  It is specified in RFC7252 IFTF standard.
8: DTLS based PKS, RK, Certificate security used.

1: Use the Publish-Subscribe model.
2: Preferably TCP, UDP can be used.
3:  Use SSL/TLS for security
4: Use CONNECT, PUBLISH, SUBSCRIBE, DISCONNECT Methods
5: Username and password required to connect message.
6: Introduced by IBM in 1999 ISO standard.