LoRaWAN
LoRaWAN Classes A, B and C
Device classes affect when downlinks can arrive and how much listening the device performs.
Device classes affect when downlinks can arrive and how much listening the device performs. Match the class to power and response requirements.
Understand receive opportunities
Class A opens receive windows after an uplink. Class B adds scheduled receive opportunities using network timing. Class C listens much more continuously except while transmitting. These differences matter when configuring devices remotely, not only when collecting sensor readings.
Check complete system support
Confirm the device firmware and network service support the selected class and its requirements. Estimate energy using the actual receive behaviour. A mains-powered device may accept more listening, while a battery sensor may tolerate delayed configuration.
Test command timing explicitly
Measure when a queued command reaches the device under normal and interrupted conditions. Define expiry, acknowledgement and safe handling of repeated commands. Do not treat a class selection as a guarantee of deterministic or safety-critical control timing.
FAQ
Which class gives the longest battery life?
Class A commonly suits low-power sensing, but actual life depends on reporting, retries, sensing and hardware.
Technical References
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