LoRaWAN CLASS B pingslot frequency hopping support

Question

I have been trying to onboard and connect a class B device on AWS using our custom gateway working in basics station mode. But i am having a hard time sending downlinks to the end device. During a pingslot period, the downlink only reaches the end device if the pingslot frequency of the device matches the ping slot frequency in the device profile in aws. However, the device switches its pingslot frequency in each period. So during the nonmatching periods, the downlink message gets lost. So I want to ask if there is any method to support multiple pingslot frequencies in aws class B mode(also called frequency hopping). Or How i can successfully Support our gateway and end device fully with class B through AWS

Answer

Hi ox-banish. The ping slot frequency and data rate you specify in the device profile is sent to the device in the `PingSlotChannelReq` MAC command. This MAC command is sent by the LNS in a class A receive window, and before any ping slot downlinks should occur. And if this MAC command specifies a frequency of 0, the device should use the default frequency plan (hopping). So then, some questions:

* what is your device?
* what LoRaWAN spec version does it implement?
* does your device receive the `PingSlotChannelReq` MAC command?
* does it contain the values you specified in the device profile?

LoRaWAN CLASS B pingslot frequency hopping support

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