Issue link: https://read.uberflip.com/i/1428383
LoRaWAN 1.0.3 Specification ©2018 LoRa™ Alliance Page 29 of 72 The authors reserve the right to change specifications without notice. currently defined for this end-device possibilities of the end- device Channel frequency ok The device cannot use this frequency The device is able to use this frequency. Table 10: NewChannelAns status bits signification 804 If either of those 2 bits equals 0, the command did not succeed and the new channel has not 805 been created. 806 807 The DlChannelReq command allows the network to associate a different downlink frequency 808 to the RX1 slot. This command is applicable for all the physical layer specifications supporting 809 the NewChannelReq command (for example EU and China physical layers, but not for US or 810 Australia). In regions where that command is not defined, the device SHALL silently drop it. 811 The command sets the center frequency used for the downlink RX1 slot, as follows: 812 813 Size (bytes) 1 3 DlChannelReq Payload ChIndex Freq 814 The channel index (ChIndex) is the index of the channel whose downlink frequency is 815 modified 816 The frequency (Freq) field is a 24 bits unsigned integer. The actual downlink frequency in Hz 817 is 100 x Freq whereby values representing frequencies below 100 MHz are reserved for future 818 use. The end-device has to check that the frequency is actually allowed by its radio hardware 819 and return an error otherwise. 820 If the DlChannelReq command is defined in the region where the end-device is operating, the 821 end-device acknowledges the reception of a DlChannelReq by sending back a 822 DlChannelAns command. The DlChannelAns command SHALL be added in the FOpt field 823 of all uplinks until a downlink packet is received by the end-device. This guarantees that even 824 in presence of uplink packet loss, the network is always aware of the downlink frequencies 825 used by the end-device. 826 The payload of this message contains the following information: 827 Size (bytes) 1 DlChannelAns Payload Status 828 The status (Status) bits have the following meaning: 829 Bits 7:2 1 0 Status RFU Uplink frequency exists Channel frequency ok 830 831 Bit = 0 Bit = 1 Channel frequency ok The device cannot use this frequency The device is able to use this frequency.