MQTT JSON/Protobuf errors

[RyanGest]

Hi Guys,

I have installed a new version of Chirstack (v4) and I am getting errors with mqtt messages. in the chirstack log I see the message received from the gateway:

INFO chirpstack::gateway::backend::mqtt: Message received from gateway region_id=“as923_4” topic=gateway/34fa40fffe1e5418/event/stats qos=AtMostOnce json=false

And then receive an error straight after:

ERROR chirpstack::gateway::backend::mqtt: Processing gateway event error: failed to decode Protobuf message: GatewayStats.rx_packets_per_modulation: invalid wire type: StartGroup (expected LengthDelimited) region_id=as923_4 topic=gateway/34fa40fffe1e5418/event/stats qos=AtMostOnce

Is anyone able to point me in the right direction to diagnose?

Thanks

Ry

[brocaar]

@RyanGest

Is anyone able to point me in the right direction to diagnose?

Are you sure the gateway is running the latest ChirpStack Gateway Bridge / MQTT Forwarder? If not, then that would explain the error (which means that the data received contains unexpected data).

[Hassan_Ansari]

Hi Brocaar, big fan, learned alot from your repos and comments on the forums. I didnt wanted to run a new topic here so asking you about the same problem I am facing, I am new in the field of IoT and still learning, I have set up a Rakwireless gateway with few devices on-board. It is using V4, mqtt for chirpstack protobuf, as per the requirement of my boss. I am looking forward to seek support on how to fetch the data over MQTT since I am not getting the same data on my MQTT Broker as on my Chirpstack application LoRaWAN frames. I am using MQTTX broker, can also use Node-red to decode the data if guided properly. Thanks in advance.