Hi everyone,
We’re facing an issue with our MQTT integration setup and would appreciate any guidance.
Setup details:
Gateway: RAK Gateway
Backend: MQTT
Network Server: ChirpStack v4.15.0
Integration: MQTT Integration (Mosquitto 2.0.18)
Issue:
We are running in a lab environment. we recently observed uplink (decrypted) messages are getting lost at the MQTT integration.
To explain, when our device sends 10 uplink packets, all 10 packets are visible in the ChirpStack UI → Device → LoRaWAN Frames / Events tab, and we can also confirm all 10 packets received with tcpdump.
However, when subscribing to all MQTT topics, we only receive 2–3 packets out of 10.
We created Postgress DB integration as well, and we saw the same behaviour as well.
Summary:
All packets successfully reach ChirpStack (confirmed via UI and tcpdump).
ChirpStack MQTT integration (qos=1) only publishes a subset of the messages (2–3/10).
No clear errors in the logs.
Question:
Why are we seeing this packet loss at the MQTT integration level? Our configuration is pretty basic/standard.
How can we ensure we get all uplinks (10/10) published through the MQTT integration?
Any advice or troubleshooting steps would be greatly appreciated.
Thank you!
