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