Downlink not sending Class a device

Setup and configuration
1

Hi There.

Im new chirpstack and got to a point where i have no idea what to try.

I get data from node, and the data looks good when i decode it.

But when i try to send a downlink from the web UI it just hangs there,
even when there are uplink the downlin is not sent.

Is there anything that i am missing? do i need to have a javascript decoder for it to work?

2

Does this mean that the message is sent to the gateway?
Is there any ways to see the trafic on the gateway itself?

this is what i see in mqtt subscribing to: gateway/gatewayid/#

qos : 0, retain : false, cmd : publish, dup : false, topic : gateway/gatewayidhere/command/down, messageId : , length : 137