The DetectionOptimize bits for the low three bits of RegDetectOptimize.
RegDetectionThreshold.
RegModemConfig1: bandwidth, coding rate, and header mode.
RegModemConfig2: spreading factor, CRC, and the top bits of the symbol timeout.
RegModemConfig3: low data rate optimization and the AGC.
The LoRa modem registers of an SX127x for a link.