Modbus driver on Proxmox about nut HOT 5 OPEN

Looks like either your setup or their packaging (inherited from Debian, CC @bigon ?) is mixed up: it may not have updated the recipes to install the drivers build against libmodbus, or you needed to request it as a package dependency.

Also, with driver=usbhid-ups (if the second mention is not a typo) it should not be loading a generic_modbus.

Anyhow, generic_modbus is not apc_modbus, which in turn is part of NUT since v2.8.1. However, for USB-capable builds you would currently need a custom build of libmodbus and then of NUT against it: https://github.com/networkupstools/nut/wiki/APC-UPS-with-Modbus-protocol

from nut.

I was testing various things, including the generic_modbus driver. my mistake. The resulting output however was the same.
thanks for the instructions, i'm going to try this, maybe in a vm instead of proxmox then.

from nut.

At some point I did test USB pass-through for UPS connections, it seemed to work :) You may have to ensure the host OS does not barge into it however (e.g. does not have its copy of NUT driver running).

Also note that it can help for testing; but for ultimate production use, with integration to turn off the UPS late in emergency shutdown, a VM might not be the right spot to send such a command - its host may need some more minutes to complete other shutdown rituals.

from nut.

ah thanks for pointing that out... in that case i'm going the route of another system altogether (I think a raspberry pi running raspbian lite). I'll check in sometime later when proxmox might have a more workable update available.

from nut.

As a Linux, it is perfectly capable of building and running a custom NUT, got one such setup "dogfeeding" in the NUT CI farm with a master-branch build protecting the PVE host. It is not with a custom libmodbus though, but that would not be something "too magical" to do (you may want to configure it with custom installation paths, like --prefix=/usr/local to avoid conflicts with system-provided one unless you intend them like with the NUT build).

from nut.