Issue link: https://read.uberflip.com/i/1428383
LoRaWAN 1.0.3 Specification ©2018 LoRa™ Alliance Page 25 of 72 The authors reserve the right to change specifications without notice. usage is region specific and is defined in the "LoRaWAN regional physical layer specification" 689 document. 690 The network server MAY include multiple LinkAdrReq commands within a single downlink 691 message. For the purpose of configuring the end-device channel mask, the end-device will 692 process all contiguous LinkAdrReq messages, in the order present in the downlink message, 693 as a single atomic block command. The end-device will accept or reject all Channel Mask 694 controls in the contiguous block, and provide consistent Channel Mask ACK status indications 695 for each command in the contiguous block in each LinkAdrAns message, reflecting the 696 acceptance or rejection of this atomic channel mask setting. The device will only process the 697 DataRate, TXPower and NbTrans from the last message in the contiguous block, as these 698 settings govern the end-device global state for these values. The end-device will provide 699 consistent ACK status in each LinkAdrAns message reflecting the acceptance or rejection of 700 these final settings. 701 702 The channel frequencies are region-specific and they are defined in Chapter 6. An end-device 703 answers to a LinkADRReq with a LinkADRAns command. 704 705 Size (bytes) 1 LinkADRAns Payload Status 706 707 Bits [7:3] 2 1 0 Status bits RFU Power ACK Data rate ACK Channel mask ACK 708 The LinkADRAns Status bits have the following meaning: 709 710 Bit = 0 Bit = 1 Channel mask ACK The channel mask sent enables a yet undefined channel or the channel mask required all channels to be disabled. The command was discarded and the end-device state was not changed. The channel mask sent was successfully interpreted. All currently defined channel states were set according to the mask. Data rate ACK The data rate requested is unknown to the end-device or is not possible given the channel mask provided (not supported by any of the enabled channels). The command was discarded and the end-device state was not changed. The data rate was successfully set. Power ACK The requested power level is not implemented in the device. The command was discarded and the end- device state was not changed. The power level was successfully set.