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MQTT, QoS, Client, Subscriber, Persistent session, Broker - Coggle Diagram
MQTT
MQTT mosquito 1.0
use clustering(broker cluster) to avoid SPOF single point of failure
Mosquito 1.0 - 2012
HiveMQ - 2013
MQTT 3.1.1 - 2014
MQTT 5 - 2018
Persistent session
The broker should remember the client
Time decoupling & synchronization decoupling
QoS
QoS1
Default and bandwidth friendly
Qos0
QoS2
Client
Sensors
Actuators
Subscriber
Server
Phone
Persistent session
Broker