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Two independent, default-off toggles under Settings › Radio. Pwr save: hardware RX duty-cycle (SX126x SetRxDutyCycle via startReceiveDutyCycleAuto). The chip cycles RX↔sleep and wakes on a preamble — no MCU state machine; recvRaw reads the packet exactly as in continuous RX. Falls back to continuous RX on non-SX126x. (Replaces an earlier software-CAD state machine that fought the hardware: polling a warm-sleeping chip gave a phantom-busy channel that stalled TX ~4 s and dropped ACKs in the scan gaps.) Auto pwr: Adaptive Power Control. tx_power_dbm becomes a ceiling; actual TX power tracks the reverse-link SNR margin (measured above the per-SF demod floor, EWMA-smoothed, proportional step with a deadband). Feedback comes from direct / room-server ACKs and, for channels (no ACK), from hearing a repeater rebroadcast our own flood; a lost confirmation ramps power back up so channel sends can't get stranded below what the repeaters can hear. Prefs schema 0xC0DE0009 (rx_powersave, tx_apc). Radio page / name bar show the live TX power; noise floor reads n/a while duty-cycling. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>