Cerbo GX MQTT LAN no N topics returned (v3.72)

Modifications
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1

Hi,

I’m trying to read Victron data locally from a Cerbo GX MK2 via MQTT on the LAN, but I’m not receiving any data messages.

Setup

  • Device: Cerbo GX MK2

  • Firmware: Venus OS v3.72

  • MQTT Access: Enabled

  • Local network security profile: Unsecured

  • LAN IP: 192.168.1.101

  • MQTT broker: port 1883

What works

  • I can connect to the broker:

    mosquitto_sub -h 192.168.1.101 -t "#" -v -d

    -> CONNECT / CONNACK OK

  • Subscribing works:

    mosquitto_sub -h 192.168.1.101 -t "N/<portalId>/#" -v -d

    -> SUBACK OK

  • Publish to request topics works:

    mosquitto_pub -h 192.168.1.101 -t "R/<portalId>/system/0/Serial" -n
mosquitto_pub -h 192.168.1.101 -t "R/<portalId>/keepalive" -m "1"

  • MQTT service restarts correctly (connection drops and reconnects when toggling MQTT or rebooting GX)

Problem

No messages are ever received on any subscription.

Examples:

mosquitto_sub -h 192.168.1.101 -t "N/<portalId>/#" -v
mosquitto_sub -h 192.168.1.101 -t "N/<portalId>/system/0/Serial" -v

-> No output at all, only PINGREQ/PINGRESP

What I expected

I expected to see messages like:

N/<portalId>/system/0/Dc/Battery/Voltage {"value":12.8}

Question

  • Is there an additional setting required to enable publishing on the LAN MQTT broker?

  • Is the R/... request mechanism different on recent Venus OS versions?

  • Does the Cerbo only publish to VRM/cloud MQTT and not to local subscribers by default?

Any guidance would be appreciated.

Thanks!

2

Have you sent a keepalive as per the docs?

3

Thanks for looking into it yes : mosquitto_pub -h 192.168.1.101 -t “R/portalID/keepalive” -m “1” -d

4

Use mqtt explorer to test your syntax and confirm if it works there or not.
If you open vrm or the console at the same time you should see all the topics appear for testing.

Are you using both interfaces on the cerbo?

5

No, raspberry Pi with openplotter and signalk SignalK MQTT Imort manager