HA on Kubernetes with Multus - Sigenergy Integration Can't Connect

[Richie-Rogers]

Hi,
As you can see from the title, this is a very edge case scenario.
To be honest, this might be the sigenergy integration, the Modbus integration or a config setting with Multus on my Kubernetes cluster.
I'll give a little info in case someone has an idea.
I have a Kubernetes cluster running Flannel CNI and Home Assistant installed as a pod.
There are some integrations that require network broadcasting functions that are not straightforward (the "easiest" option is to configure host networking for the HA pod, but that has limitations and security implications).
There is a plugin for Kubernetes that enables LAN IP addresses to be directly attached to pods.
This worked for me, except it caused my HA connection to my sigenergy inverter to keep dropping out every minute or even less.
Removing the Multus config from my HA pod and it works again.
I've setup a test Kubernetes cluster, which is configured the same as my "prod" cluster - this time with Multus installed before I've installed HA.
Again, everything works, so I then tried to add the sigenergy integration, but it keeps failing to connect to my inverter:

If I remove the Multus config from the HA pod, then the sigenergy integration connects fine.

Nothing flags up in the HA logs for this, so it's leaving me in the dark.

Very much a long shot here, but has anyone else had this and managed to resolve it?
I'm going to focus on some Multus config as being the issue, but I was hoping someone might have another idea.

Thanks,
Richie