MQTT protocol
The MQTT protocol is a lightweight network protocol used for publish/subscribe messaging, optimized for wireless remote devices that might have limited bandwidth and intermittent connectivity. This appendix describes the following concepts about the MQTT protocol:
•Quality of service (QoS) levels and flows
•QoS determination
•QoS effect on performance
•Client ID
•Durable and non-durable subscribers
•MQTT persistence
•MQTT header
•Keep alive
•Retry message delivery
•Last Will and Testament
•Retained flag on messages ...

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