ERROR chirpstack::uplink: Deduplication error error=Unexpected m_type: Proprietary
ERROR chirpstack::uplink: Deduplication error error=invalid RejoinType

Question

Hi Team,
I’m seeing a couple of recurring errors in the logs. Could someone help identify what might be causing these errors?

Thanks!

2025-12-31T11:38:17.693110Z  INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id="eu868" topic=VDMS101_eu868/gateway/647fdafffe01599c/event/up qos=AtMostOnce json=false
2025-12-31T11:38:17.895918Z  INFO up{deduplication_id=9cd040d7-4418-4442-b92b-bfb2beaf120e}: chirpstack::uplink: Uplink received m_type=Proprietary
2025-12-31T11:38:17.897982Z ERROR chirpstack::uplink: Deduplication error error=Unexpected m_type: Proprietary
2025-12-31T11:41:34.796671Z  INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id="eu868" topic=VDMS101_eu868/gateway/647fdafffe01599f/event/stats qos=AtMostOnce json=false
2025-12-31T11:46:34.932272Z  INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id="eu868" topic=VDMS101_eu868/gateway/647fdafffe01599c/event/stats qos=AtMostOnce json=false
2025-12-31T11:51:34.802590Z  INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id="eu868" topic=VDMS101_eu868/gateway/647fdafffe01599f/event/stats qos=AtMostOnce json=false
2025-12-31T11:52:33.671588Z  INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id="eu868" topic=VDMS101_eu868/gateway/647fdafffe01599c/event/up qos=AtMostOnce json=false
2025-12-31T11:52:33.873834Z ERROR chirpstack::uplink: Deduplication error error=invalid RejoinType
2025-12-31T11:53:25.014187Z  INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id="eu868" topic=VDMS101_eu868/gateway/647fdafffe01599f/event/up qos=AtMostOnce json=false
2025-12-31T11:53:25.216750Z ERROR chirpstack::uplink: Deduplication error error=unexpected major
2025-12-31T11:56:34.812328Z  INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id="eu868" topic=VDMS101_eu868/gateway/647fdafffe01599c/event/stats qos=AtMostOnce json=false
2025-12-31T11:56:34.815029Z  INFO stats{gateway_id=647fdafffe01599c}: chirpstack::storage::gateway: Gateway partially updated gateway_id=647fdafffe01599c
2025-12-31T12:01:34.907582Z  INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id="eu868" topic=VDMS101_eu868/gateway/647fdafffe01599f/event/stats qos=AtMostOnce json=false
2025-12-31T12:01:34.912098Z  INFO stats{gateway_id=647fdafffe01599f}: chirpstack::storage::gateway: Gateway partially updated gateway_id=647fdafffe01599f
2025-12-31T12:06:34.984692Z  INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id="eu868" topic=VDMS101_eu868/gateway/647fdafffe01599c/event/stats qos=AtMostOnce json=false
2025-12-31T12:06:34.987470Z  INFO stats{gateway_id=647fdafffe01599c}: chirpstack::storage::gateway: Gateway partially updated gateway_id=647fdafffe01599c
2025-12-31T12:08:17.736273Z  INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id="eu868" topic=VDMS101_eu868/gateway/647fdafffe01599f/event/up qos=AtMostOnce json=false
2025-12-31T12:08:17.939130Z ERROR chirpstack::uplink: Deduplication error error=unexpected major
2025-12-31T12:10:52.569044Z  INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id="eu868" topic=VDMS101_eu868/gateway/647fdafffe0159a6/event/up qos=AtMostOnce json=false
2025-12-31T12:10:52.773532Z ERROR chirpstack::uplink: Deduplication error error=invalid RejoinType
2025-12-31T12:11:34.909592Z  INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id="eu868" topic=VDMS101_eu868/gateway/647fdafffe01599f/event/stats qos=AtMostOnce json=false
2025-12-31T12:11:36.749619Z  INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id="eu868" topic=VDMS101_eu868/gateway/647fdafffe0159a6/event/up qos=AtMostOnce json=false
2025-12-31T12:11:36.951897Z ERROR chirpstack::uplink: Deduplication error error=invalid RejoinType
2025-12-31T12:11:39.903024Z  INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id="eu868" topic=VDMS101_eu868/gateway/647fdafffe0159a6/event/up qos=AtMostOnce json=false
2025-12-31T12:11:40.106859Z ERROR chirpstack::uplink: Deduplication error error=invalid RejoinType

Orne Brocaar · Answer

Please note that these could be caused by Proprietary or non-LoRaWAN payloads (that are sent using LoRa). As a proprietary payload has an undefined payload structure, ChirpStack is not able to handle it, and will therefore drop it.

With regards invalid RejoinType, I think this could use a better error message, as it does not contain the actual value. I will update this (https://github.com/chirpstack/chirpstack/commit/ffd6ba72d44f67f7acc6dd522c91e1e9fdfb49f9).

ERROR chirpstack::uplink: Deduplication error error=Unexpected m_type: Proprietary/ invalid RejoinType

1 Answers