Transmission ACK events are not recognized

Versions:
Ubuntu 20.04.6 LTS
Chirpstack 4.12.1
Chirpstack-Gateway-Bridge 4.0.11
Mosquitto 2.0.21

All runs on same server.

It seems “ack” packets aren’t recognized by chirpstack although beeing published by gateway bridge. This means TX frame counter is never incremented.

The “stat” events and the “up” events are working.

This happens with marshaler json and protobuf.

mosquitto_sub -h localhost -t eu868/gateway/+/event/ack
{“gatewayId”:“a8404121f4c04150”,“downlinkId”:1241325437,“items”:[{“status”:“OK”},{}]}
{“gatewayId”:“a8404121f4c04150”,“downlinkId”:1788170512,“items”:[{“status”:“OK”},{}]}
{“gatewayId”:“a8404121f4c04150”,“downlinkId”:987861353,“items”:[{“status”:“OK”},{}]}
{“gatewayId”:“a8404121f4c04150”,“downlinkId”:3166794374,“items”:[{“status”:“OK”},{}]}
{“gatewayId”:“a8404121f4c04150”,“downlinkId”:3728172967,“items”:[{“status”:“OK”},{}]}
{“gatewayId”:“a8404121f4c04150”,“downlinkId”:2579503039,“items”:[{“status”:“OK”},{}]}
{“gatewayId”:“a8404121f4c04150”,“downlinkId”:1756329990,“items”:[{“status”:“OK”},{}]}
{“gatewayId”:“a8404121f4c04150”,“downlinkId”:2100856382,“items”:[{“status”:“OK”},{}]}
{“gatewayId”:“a8404121f4c04150”,“downlinkId”:1277532772,“items”:[{“status”:“OK”},{}]}

In Chirpstack only “up” events are visible:

Can someone please help?
Regards, Johannes

Same version, same problem here.

After another search in the forum I found the reason.
In my case it is related to the redis-server version.

Forum thread

I updated and it is working.