Hello ChirpStack team,
We are observing an abnormal backhaul data usage issue with one specific gateway after migrating from ChirpStack v3 to v4.
Scenario:
Network: ChirpStack v4 (Docker-based deployment)
Gateway transport: MQTT over cellular
All gateways are configured similarly and have the same number/type of sensors
Sensors transmit standard uplinks (very low LoRaWAN payload size)
Issue:
One gateway (647fdafffe01358e) is showing extremely high cellular usage:
~600 MB downlink
~300 MB uplink
Whereas other gateways in the same setup show normal usage:
~30 MB down / ~15 MB up
~10 MB down / ~10 MB up
Observations:
LoRaWAN uplink/downlink frame sizes are very small (verified from Frames tab)
No unusual sensor traffic compared to other gateways
Gateway is operational and forwarding data correctly
Issue is isolated to a single gateway
Suspicions / questions:
Can repeated MQTT/TLS reconnects or unstable backhaul cause excessive downlink traffic?
Does ChirpStack re-send configuration, stats acknowledgements, or state sync repeatedly on reconnect?
Are there known cases where region mismatch or ADR instability leads to excessive gateway traffic?
Are there recommended ways within ChirpStack to:
Detect frequent gateway reconnects?
Reduce control / stats traffic?
Tune gateway stats or keepalive behavior?
We would appreciate any guidance on:
Known causes for such asymmetric high backhaul usage
Logs or metrics we should specifically inspect on the ChirpStack side
Best practices to avoid this scenario
Thank you in advance for your help.
