General Question about Queuing

[RR86]

Hi,

As I still have problems with sending Class-C Downlinks (it often takes minutes until receiving txack) I am wondering where messages will be queued?

Is it only on Chirpstack NS site or also direct on Gateway site?
Currently I read a post here regarding rx1 delay time. Within the post someone explained that rx1 delay time will be send to Gateway so that the Gateway queue the packet until the time to transmit.

RX1 delay does not delay command frames

The rx1_delay setting will be reflected in the scheduled tmst of the gateway transmission. For OTAA devices the rx1 delay is sent in the join accept. For ABP devices it shouls be configures to the correct out of band, the CS and device delay need to be in sync to have a successful downlink. The CS expects the gateway to queue the packet until the time to transmit. Additional metadata not shown in the UI is sent with the packet dr, freq and payload.

BR

[brocaar]

The RX1 Delay is relevant to Class-A, not C (it defines the delay between the uplink and the downlink receive-windows).

Most likely, the downlink is in your case in the ChirpStack downlink queue. I’m not sure what is causing your issue as there are many different things that could cause a delay.

For example when you are using confirmed downlinks, then ChirpStack will keep the item in the queue until it has been acknowledged by your device, or until the Class-C timeout has occurred (configured in the device-profile).