MQTT and QOS

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.