Enable Class C after join

Question

I have a Device ("Eastron SDM630MCT").

I set up the device without Class C enabled, as I didn't need to send Downlinks.

But now I do.

I enabled Class-C in the Device Profile and sent a Downlink.

The Downlink is not sent immediatly but waits for an Uplink (just like Class A)

A new device joins and Downlinks work as expected

It should be possible to enable Class C after join and for it to work as expected

rimelink · Answer

There are two points to note about LoRaWAN Class C

After a Class C node is registered, it must first send a frame of data and be successfully received by the server (handshake communication). After that, the server can send data to the node at any time.
Both nodes and servers need to be configured as Class C

reference link：https://blog.csdn.net/jiangjunjie_2005/article/details/104439355