Keepalive Cerbo-MQTT-Telegraf-Influx-Grafana

Modifications
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1

Cerbo Gx V3.75,Telegraf V1.39 Influxdb2. Telegraf and Influxdb2 are running on a Raspberry Pi Debian 13 and Grafana is on MacBook, all within wired ethernet LAN.

I have the MQTT writing to Telegraf, which is writing to Influxdb and all data is correct.

I cannot however manage to keep the Cerbo MQTT server open.

I ran a mosquitto_pub message to the Cerbo with a message “” (empty) and put this in a crontab which repeats every 45 seconds. The job is running correctly but the Cerbo MQTT closes after 1 minute. - mosquitto_pub -h 192.168.8.xxx-t ‘R/c0619abxxxxx/keepalive’ -n

I tried the NodeRed Inject - MQTT out as suggested in the post - Local MQTT connection times out

From this Github GitHub - victronenergy/dbus-flashmq: Plugin for FlashMQ that interfaces between DBUS and MQTT. · GitHub , which details a keepalive in the document.

I ran the script in the terminal - ( first=“”; while true; do if [[ -n “$first” ]]; then echo ‘{ “keepalive-options” : [“suppress-republish”] }’; else echo “”; fi ; first=true; sleep 30; done ) | mosquitto_pub -t ‘R/c0619abxxxxx/keepalive’ -l -h ‘192.168.8.xxx’ But the terminal froze.

I am only just beginning in my computer knowledge, is anyone able to help me with a keepalive as above and if so what I did wrong when running the terminal script.

2

Dear MCKillop,

read Keepalive via NodeRed to Venus - VictronEnergy

Some answer is from marc-hd with a complete howto in node red.

Have fun

Marc

3

I had a similar issue. Here is an example of a Node-RED keep-alive flow.

4

Yes, that is the post that I used to set up the node red. The only difference is that I set it with unsecured, hence port 1883. But it didn’t work.

5

Does MQTT out node show connected ? Are you sure about that port, mosquitto_sub can connect into?

6

The Node is showing as connected. I use port 1883 for the Telegraf.conf and data is being transferred when the Cerbo is triggered by viewing the Webgui in a browser. I have attached 2 of the screen shots from the Node Red browser.

Cerbo Node Red 2.pdf (157.5 KB)

Cerbo Node Red 1.pdf (207.5 KB)

7

Isn’t the MQTT topic case sensitive? Try using an uppercase ‘R’.

8

Thank you, that now works. Both Cerbos now being recorded in Influxdb. I will try and get the Debian crontab working so I can take the Cerbos off OS Large and Node Red.