I am integrating my Cerbo into Home Assistant using MQTT. MQTT using TLS required me to extract the self-signed CA certificate from the Cerbo. That same certificate has worked since December last year. It did not change during previous updates to Venus OS. Last night I updated to Venus OS 3.64, th…

Venus platform sends a HUP signal to reload FlashMQ settings. It does this with ‘killall -HUP flashmq’. But, apparently it does this even before FlashMQ is started, and targets the temporary flashmq used for testing the cert. Because in that mode it doesn’t have a signal handler, it aborts. It’s an…

Do you have any mods running on the Cerbo? Maybe a mod causes a full data partition which could cause issues?

I agree, if it was an intentional change that improves security, I’ll happily accept that and will figure out a way to live with it. What surprised me is that I did not find anything in the release notes. That’s why I am still leaning towards the more likely explanation that it was an unintentional…

No mods on the Cerbo. I am using the “Large” image. I had intended to check out Node-Red, but I didn’t get around to it yet. Or rather: I didn’t need to, because Home Assistant does everything I need via MQTT. Mostly: adjusting the DVCC current to slow down charging when the battery gets close to f…

Can you confirm the /data partition (or any partitions for that matter) aren’t full. On the current version you can check via the UI in settings → general → support. It isn’t clear from your reply. thanks. Also, FYI as per new standards: The maximum certificate lifetime is going down: From to…

In Settings → General I don’t find “Support”. Perhaps this info found under Settings →VRM refers to the same partition? [image] Interesting info about certificate expiries. Ok, I’ll write a script to regularly update the certificate downloaded to my MQTT broker. That will cover both this curren…

The certificate is not supposed to change every time, naturally. It’s generated when absent (first time) or regenerated when deemed corrupt/unusable. Something may be going wrong in this detection. Are you able to ssh into the cerbo and give me the output of openssl x509 -text -in /data/keys/mosqui…

Thanks for persisting. I found it. :slight_smile: Called “Modification Checks” for me. Still plenty of storage, 1GB available. [image]

[image] wiebe: openssl x509 -text -in /data/keys/mosquitto.crt [image] I did a bit more digging. This is the directory they keys are stored. Only the mosquitto key was renewed, the host key was not changed since it was first created back in November. [image] I also checked /var/log/mosqu…

The correct logs would actually be in /var/log/flashmq. Can you look there as well, including the rotated files (so not just current)? Use ta64nlocal to see the actual times. For example: grep -A 5 -i -F '*** starting flashmq' /var/log/flashmq/*

Why did the SSL certificate change after update to Venus OS 3.64?

DIY

nickdb (Nick) 16 August 2025 08:11 9

What version are you on? It might be called modifications in an earlier version but this pretty much since 3.63 iirc. VRM often refers to the logging SD card assuming you have one.

Topic		Replies	Views
Cerbo: VECAN1 error messages in /var/log/messages Q&A and troubleshooting marine , expert , vrm , lynx_bms , cerbo-gx	18	351	3 July 2025
Venus OS 3.6 and dbus-serialbattery or other mods Deutschsprachiger Bereich firmware_update	37	2839	28 April 2026
Where is Node-Red gone in Venus 3.60? Node-RED diy , domestic , gx_device	81	1389	3 July 2025
2 VenusOS's in one network, gui-v2 gives the wrong one DIY diy , ethernet , cerbo-gx	17	265	17 July 2025
#67 Verbindung zum BMS unterbrochen Deutschsprachiger Bereich	6	299	5 October 2024

Why did the SSL certificate change after update to Venus OS 3.64?

Related topics