Downlink gets lost after activation of the device

[Esmat_Abasi]

Hi, I am using gRPC to activate several devices at the same time and sending them a Downlink while doing that. I can see the Downlink in the queue, but as soon as I turn on the Devices and they connect and start sending Uplinks, my downlink disappears from the queue but the events doesn’t show any downlink. My question is why does this happen? Isn’t it possible to enqueue downlinks while the devices aren’t seen yet by chirpstack, so once they get connected the downlink gets send?
Thanks in advance!

[Liam_Philipp]

By default the queue gets flushed on a join. Here’s a convo from back in V3, not sure if Brocaar made the change to add the flag or not yet:

Just join device only. Why downlink queue data delete?

Not yet, the queue is persisted by the NS, while the payloads are encrypted by the AS. leaving the items in the queue means that (since these are already encrypted) will give you garbage data. There are some workarounds possible, but I’m not planning to add this to v3. The upcoming v4 merges the AS and NS components so that queue items can be encrypted on sending the downlink. That makes it really easy to implement a “flush device queue on join” flag

EDIT: Ah, it is in the device profile, just disable that and you should be good to go

[Esmat_Abasi]

Thank you! You saved me a lot of time.