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battery: alert on mains<->battery transitions

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Pushover notification when the router loses mains (now on battery) and when
mains is restored. One alert per real transition; first sample is skipped so a
restart while already on battery doesn't false-fire. Independent of the
low-charge 25/20/15/10% alerts.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Andreas Wrede
2026-06-28 21:52:49 -04:00
co-authored by Claude Opus 4.8
parent b75b5b16c7
commit 52e948654e
1 changed files with 15 additions and 4 deletions
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power/van-battery
+15 -4
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@@ -177,15 +177,26 @@ def main():
on_batt = read_on_battery(cfg)
cap = read_capacity(cfg)
capstr = f"{cap}%" if cap is not None else "unknown charge"
# Mains <-> battery transition alerts. Skip the very first sample (prev is None)
# so a restart while already on battery doesn't fire a spurious "on battery".
if on_batt is not None and prev_on_batt is not None and on_batt != prev_on_batt:
if on_batt:
log(f"mains lost — running on battery at {capstr}", "warn")
pushover(cfg, f"⚡ {HOST}: on battery",
f"Mains power lost — now running on battery ({capstr}). "
f"Low alerts at {cfg['warn_levels']}%, auto-shutdown at {shutdown_level}%.")
else:
log(f"mains restored at {capstr} — alerts re-armed")
pushover(cfg, f"🔌 {HOST}: back on mains",
f"Mains power restored ({capstr}). Battery alert sequence re-armed.")
if on_batt is False:
# On mains: re-arm the whole sequence for the next discharge episode.
if prev_on_batt:
log("mains restored — alerts re-armed")
last_alerted = None
shutdown_issued = False
elif on_batt is True and cap is not None:
if prev_on_batt is False:
log(f"mains lost — running on battery at {cap}%", "warn")
sev = severity(cap, levels)
if sev is not None and (last_alerted is None or sev < last_alerted):
last_alerted = sev