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FOpts Encryption, Usage of FCntDwn Errata on the LoRaWAN L2 1.1 Specification

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The frame-options length field (FOptsLen) in FCtrl byte denotes the actual length of the frame options field (FOpts) included in the frame.

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The frame-options length field (FOptsLen) in FCtrl byte denotes the actual length of the frame options field (FOpts) included in the frame.

FOpts transport MAC commands of a maximum length of 15 octets that are piggybacked onto data frames; see Chapter 5 for a list of valid MAC commands.