Semtech LR1121 - LR1121 Provisioning; Description; Provisioning Commands; Getchipeui

LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
113 of 130
Semtech
Proprietary & Confidential
www.semtech.com
11. LR1121 Provisioning
11.1 Description
The LR1121 is pre-provisioned during Semtech’s production test flow with two identifiers, which can be used to identify
devices on LoRaWAN® networks. For more information, please refer to the LoRa Alliance
® website:
https://LoRa-alliance.org/
• The ChipEui number is globally unique, and identifies the device.
• The SemtechJoinEui is re-used on a set of Semtech devices.
• A unique Device Key, DKEY, is also pre-provisioned.
• With these numbers, a Device PIN is calculated upon execution of the DeriveRootKeysAndGetPin(...)
command. This PIN is necessary to claim the device on the LoRa Cloud™ JoinServer services. For more information,
please refer to the LoRa Cloud website: https://www.LoRacloud.com/portal/join_service.
All these unique identifiers are stored in the device’s persistent memory. They are pre-configured by Semtech to ease the
LoRaWAN implementation and access LoRa Cloud Join Server services, but can also be ignored by the user.
11.2 Provisioning Commands
11.2.1 GetChipEui
Command GetChipEui(...) reads the LR1121’s pre-provisioned ChipEui. It is a globally-unique number, assigned by
Semtech in production, using one of Semtech’s IEEE assigned EUIs. In the standard use-case, the ChipEui is used to derive
the two LoRaWAN root keys (AppKey, NwkKey), and should also be used as DevEui (in the LoRaWAN definition) to generate
the Join Request (which itself transports the DevEui).
• ChipEui is coded on 8 bytes, in big endian format.
Table 11-1: GetChipEui Command
Byte 0 1
Data from Host 0x01 0x25
Data to Host Stat1 Stat2
Table 11-2: GetChipEui Response
Byte 0 1 ... 8
Data from Host 0x00 0x00 ... 0x00
Data to Host Stat1 ChipEui(63:56) ... ChipEui(7:0)