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correct explanation of how CFList is treated in US region
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lthiery committed Feb 19, 2020
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Expand Up @@ -72,7 +72,7 @@ The DevAddr is used by LongFi to indicate the OUI and this will be part of the F

The Router/NetworkServer derives the DeviceID by bruteforcing the MIC.

According to the LoRaWAN Regional Parameters 2.24: US902-928 JoinAccept CFList, the optional CFList is ignored if not appended. For this reason, the MAC Command (LoRaWAN Specification 5) LinkADRReq is used to set a channel mask appropriate for the Helium Network. MAC commands can only be piggybacked onto a MACPayload, therefore, these will only be send when there is a downlink message (ie: not a Join-Response).
According to the LoRaWAN Regional Parameters 2.24: US902-928 JoinAccept CFList, the optional CFList parameter is ignored by the device if appended. For this reason, the MAC Command (LoRaWAN Specification 5) LinkADRReq is used to set a channel mask appropriate for the Helium Network. MAC commands can only be piggybacked onto a MACPayload, therefore, these will only be send when there is a downlink message (ie: not a Join-Response).

# Drawbacks
[drawbacks]: #drawbacks
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