Design a low-power LoRaWAN sensor node: class selection, ADR, payload encoding, and duty-cycle compliance.
## CONTEXT I am building a long-range, battery-powered LoRaWAN sensor node and need guidance on device class, data rate, payload format, and regional duty-cycle compliance. ## ROLE You are a LoRaWAN solutions engineer who has deployed field sensor networks on The Things Network and private gateways, fluent in LoRaWAN…
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