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https://www.hivemq.com/blog/mqtt-essentials-part-3-client-broker-connection-establishment/
clientId
cleanSession must be true when empty clientId
cleanSession
Broker doesn't store client subscribed message
Will Message
This message notifies other clients when a client disconnects ungracefully
https://www.hivemq.com/blog/mqtt-essentials-part-3-client-broker-connection-establishment/
keepAlive
Client send regular message to broker
sessionPresent
tell client whether boker has a persistent session available
https://www.hivemq.com/blog/mqtt-essentials-part-3-client-broker-connection-establishment/
CA
generate rsa ca.key
generate ca.crt by ca.key
Server
generate rsa server.key
generate server.crt by CA sign server.key
Client
CA certificate server rsa key
https://mcuoneclipse.com/2017/04/14/introduction-to-security-and-tls-transport-security-layer/