AWS LoRaWAN LNS - Downlink support

Great, thanks!

What happens if I send a downlink message to a Class A device? Does it get sent to the Gateway, and the Gateway sends it to the node the next time the node sends an uplink?

Thanks.

Is this documented anywere? I can't find it.

I have a device that has a Class C device profile (US915-C-OTAA) and when I use SendDataToWirelessDevice to send data to it, it doesn't get sent right away. It's only getting sent after an uplink. Since it's a Class C I would have expected to be sent right away. Am I doing something wrong?

For Class A devices, the downlink packets will be held in AIL until an uplink is seen.

Edited by: russ-awsiot on Mar 14, 2021 10:22 AM

The most possible cause for this issue might be that you are using TransmitMode=1 for the DL. If the device is not acking back in time, the next DL packet cannot get sent until the previous one is time-out. If you need further diagnosis, you can provide more information here and we can further investigate.

Regarding the documentation, I think it is not that detailed regarding the downlink handling yet. The API reference can be found here, https://docs.aws.amazon.com/iot-wireless/2020-11-22/apireference/API_SendDataToWirelessDevice.html. But I guess you already know it. We will keep updating the documentation to have all possible details reflected. Thanks for the feedback.