QoS stands for : Quality of service
There are 3 different QoS available for MQTT:
- QoS level 0 : “At most once” - The message is send without acknowledgement
- QoS level 1 : “At least once” - The message is send with acknowledgement
- QoS level 2: “Exactly once” - The message is send with acknowledge (avoid message duplication mechanism)
Wattsense is at the QoS level 1.
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