v3.2.0

Added

• UPS sources: a UPS is no longer necessarily an SNMP device. Every UPS entry now has
  a "Read via" selector, and the second source is a NUT server (Network UPS Tools,
  TCP 3493) — the answer for UPS devices with no network card, i.e. everything attached
  by USB or a serial cable. Any existing upsd works: the UPS server built into a
  Synology/QNAP/TrueNAS NAS, a Raspberry Pi, an OPNsense box, or a NUT install on a
  Proxmox host. Configuration is host, port, the UPS name from upsd's ups.conf, and
  optionally a user name and password.
• PVE-UPS acts strictly as a read-only NUT client: it only ever sends LIST VAR, never
  a command, and never runs upsmon. NUT is used as a device driver — the shutdown
  decision, the thresholds and the host policy stay in this appliance, so there are still
  no config files to write and no shutdown scripting on any host.
• The UPS test now names the trigger conditions the device cannot feed at all ("This UPS
  does not report: runtime remaining, battery charge"), because a threshold that can never
  fire is more dangerous than a visible error. Applies to both source types — plenty of
  NUT drivers omit battery.runtime, and plenty of SNMP cards omit
  upsEstimatedMinutesRemaining.
• type field in each UPS entry of the /api/status snapshot, and the dashboard card
  says which source a UPS is read through.
• tests/nutsim.py, a fake upsd for development and tests — the NUT counterpart of
  snmpsim + snmpdata/. Runnable standalone (python -m tests.nutsim --scenario battery)
  to click through the wizard without any UPS hardware.

Changed

• POST /api/test/ups replaces POST /api/test/snmp as the wizard's test endpoint and
  handles every source type. The old path stays as an alias and behaves identically.
• Event-log wording and trigger reasons no longer say "SNMP" where they apply to any
  source ("No response for 3 polls …" instead of "No SNMP response for 3 polls …").
  The fail-safe behaviour itself is unchanged.
• The per-object test diagnosis was generalised from "per SNMP object (OID)" to "per
  object" and gained two outcomes: missing (the driver does not publish this variable)
  and stale (upsd answers, but its driver has lost contact with the UPS).
• Configuration schema: UPS entries carry an explicit type (snmp or nut). Existing
  configuration files and backups are migrated on load — an entry without type is read
  as SNMP, exactly as before — and the field is written out on the next save.

Security

• A NUT server that reports stale data (ERR DATA-STALE, ERR DRIVER-NOT-CONNECTED) is
  treated as unreachable rather than as a valid reading. upsd keeps serving the last
  known values when its driver dies, and accepting those would have meant reporting
  "on mains" through an outage. The same applies when a driver omits ups.status
  entirely: the UPS counts as unreachable (alarm, never a shutdown) instead of silently
  looking healthy.