深入了解 LoRaWAN MAC 命令（英文教程）

1. Preface

This paper is goes into depth regarding the MAC Commands used for LoRaWAN® network

administration. It is aimed at end device software developers and managers of teams building

devices with LoRa® that implement the LoRaWAN Link Layer Specification v1.0.4. This paper helps

you gain an understanding of different types of MAC commands, what each command is used for,

and how to interpret the commands.

Already using software such as LoRaMAC-Node to handle MAC commands? This article

gives you the background you need to understand how the software is working, review the

code, and gain confidence that your end device is following the standards and best practices

(FRMPayload), or as a separate packet using the entire Frame Payload.

When MAC commands are sent with other data in a packet (also referred to as

piggybacking), the Frame Options Length (FOptsLen) field in the MAC payload are set to a

value greater than zero (0). The MAC commands themselves are sent in the FOpts field in the

Frame Header. The commands in the FOpts field are not encrypted in LoRaWAN 1.0.x.

3. MAC commands sent with a regular data downlink

When MAC commands are sent in a separate packet, the Frame Port (FPort) field in the

MAC payload is set to 0. The FRMPayload field in the MAC payload contains the MAC

commands. The FOpts field in the Frame Header are absent. The FOptsLen field in the Frame

Control is also set to 0, and the FRMPayload field must be encrypted as described in the