CoAP protocol and protocol MQTT

CoAP协议：Constrained Application Protocol

        CoAP protocol is mainly applied to the resource-constrained device things, it is a message-based protocol request / response model.

CoAP protocol and HTTP The main difference between the agreement:

1. CoAP binary header, HTTP header in text.

2. CoAP reduce the number of head header of available options.

3. CoAP reducing the number of HTTP methods, such as deleting the TRACE, OPTIONS method.

4. CoAP available support detection means.

 

MQTT协议：Message Queuing Telemetry Transport

        MQTT protocol is message-based client / server publish / subscribe transfer protocol, IBM has released in 1999.

CoAP agreement and MQTT main difference between the agreement:

1. CoAP protocol is a request / response model, MQTT agreement is a publish / subscribe model.

2. CoAP protocol based on UDP protocol, connectionless; the MQTT protocol is based on TCP, the connection length.

3. CoAP is a single protocol for a single transmission of information between the Server and the Client, MQTT a plurality of client-many messaging protocol through the central agency.

 

	MQTT	CoAP
transfer method	TCP	UDP
Message Type	Publish / Subscribe	Request / Response
Effectiveness of	it is good	difference
Power	general	small
Inversion of Control	it is good	difference
QoS support	Yes	no

 

appendix:

mosquitto is to achieve a proxy server MQTT3.1 protocol. mosquitto install (Ubuntu):

(1) introducing mosquitto warehouse and updates.

sudo apt-get install software-properties-common

sudo apt-add-repository ppa:mosquitto-dev/mosquitto-ppa

sudo apt-get update

(2) Installation mosquitto package.

sudo apt-get install mosquitto

(3) development kits mosquitto installed.

sudo apt-get install libmosquitto-dev

(4) mounted mosquitto client.

apt-get install mosquitto-clients

 

 

Quote: "do it yourself design of Things"

https://blog.csdn.net/MENGHUANBEIKE/article/details/75212695