What is QoS?
QoS (Quality of Service) is a network technology that prioritises certain traffic over others to guarantee minimum performance for critical applications – in MQTT defining three delivery guarantee levels for message reliability.
Technical Definition: A network technology that prioritises certain traffic over others to guarantee minimum performance for critical applications. In MQTT, QoS levels define how reliably a message is delivered: QoS 0 (at most once), QoS 1 (at least once), QoS 2 (exactly once).
Why it matters: QoS is a prerequisite for reliable real-time systems. In a facility network, fire alarm signals must always have higher priority than a tenant’s video stream. Without QoS, critical messages can be delayed or lost under network load.
HubMind’s view: We dimension QoS based on the criticality of each data flow. Safety-critical signals always receive QoS 2 in MQTT and traffic prioritisation at the network layer.
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