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
reference link：https://blog.csdn.net/jiangjunjie_2005/article/details/104439355
The registration, when does that happen?
The Device supports Class C. Class C is enabled in the Device Profile.
Unless an uplink message is received from the node, ChirpStack has no way of knowing which gateway can be used to send downlink messages to the node. Therefore, handshake communication is essentially about establishing the link and informing ChirpStack through which gateway to send the messages.
