A Belgian P1 meter publishes two UNSIGNED registers, not one signed figure.
Until now the add-on asked the installer to bridge that gap with a template
sensor, which put the sign convention of the whole control loop in a text box.
This moves it into the EMS: net = import - export, derived once, in one place,
with a test that fails if anyone inverts it.
Two transports behind one contract, chosen by `meter_source`: the HA WebSocket
subscribing to the DSMR integration's entities, and MQTT on a configurable
topic. Everything downstream reads P1Ingest, so switching is a config edit.
`meter_source: off` is the default and keeps the existing meter_entity path,
so no installed system changes until it opts in.
The other half is the timestamp. Every accepted sample is stamped at ingest
with a monotonic clock, `meter_max_age_s` is applied to it, and the age is
published as sensor.p1_sample_age_s for the ESP32's stale-input watchdog. That
entity is recomputed against the clock every second rather than only when a
telegram lands, because HA pushes state only on change: a meter frozen at a
constant reading emits nothing and looks, to anything watching the value,
exactly like a meter that has died. The age tells them apart.
Deliberately absent: any fallback to an inverter-side power figure. The
inverter's own AC power correlates 0.998 with battery power and 0.09 with the
real meter, so failing over to it means regulating against your own output.
A gap stays a gap - a reconnect emits no synthetic sample, and a rejected
telegram never resolves to 0 W or refreshes the timestamp.
Quarter-hour averages are time-weighted over clock-aligned blocks rather than
a mean of samples, so a cadence change cannot bias the capacity-tariff figure,
and only offtake is accumulated so a quarter of pure export averages to 0 kW.
Per-phase import is kept separately: on an unbalanced three-phase load the
phase sum and the connection net are different numbers, and only one of them
is billed.
test_p1.py: 99 checks, runnable with a bare interpreter and no meter. Includes
an end-to-end run of the HA transport against a fake Home Assistant websocket.
Stacked on SAFETY-04; nothing here touches control.py.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Du77usMj8XNKNFZGmUiWDa
The loop was in velocity form: the accumulator WAS the commanded power, so
"clamp the integrator" and "clamp the output" were the same line of code and
could not be set apart. This makes the accumulator an explicit carried value
(`i_w`), bounds it with its own `integrator_max_w`, and keeps the output clamp
where it was. Killing either mechanism now still leaves the other holding -
which is the point of the ticket, and what the new regression test asserts.
Freeze semantics: while saturated the integrator may unwind but not wind
further. A strict freeze would strand the command at whatever it reached,
because the condition that releases it is the inverter tracking again, and not
tracking is exactly what saturation means.
The integrator is re-seeded from the arbiter's actual output whenever the loop
did not get what it asked for, so entering any failsafe (all of which resolve
to 0 W) zeroes it, and the first cycle after release does not dump the stale
period as power.
test_control.py: 24 -> 33 checks, all passing.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Du77usMj8XNKNFZGmUiWDa
The deadband is a one-way ratchet: any resting point inside it holds
indefinitely. Import and export are separate registers on the meter, so a
loop resting at +14 W bills 0.34 kWh/day while behaving perfectly.
target_grid_w (default -10 W) moves that residue onto the export register.
Worst billed rest point drops from 15 W to under 5 W. Behaviour is unchanged
at target_grid_w: 0.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Two controllers writing one actuator is the failure this system exists to
avoid. "Exactly one writer" was true, but only as a convention held up by
careful reading - which does not survive an EV charger and a heat pump wanting
the same battery.
Strategies now return claims and arbiter.py resolves them:
highest-priority `set` wins (none at all means 0 W), then every `limit` whose
priority is >= that set's applies, most restrictive first; contradictory
limits command 0 W and are flagged as the bug they are.
The second clause is the whole point. "Money outranks maintenance" used to be a
hand-written exception inside a Jinja template; it is now a consequence of the
priorities - the charge-only limit binds the loop but cannot bind a
higher-priority peak claim.
Also: maintenance shaping moved out of control.py, which is a controller again
and not a policy engine; the loop now tracks the arbiter's actual output rather
than its own last wish, so it does not jump when it regains control; and every
decision explains itself ("loop -> 0 W, limited by maintenance(charge-only)")
in the UI and the log.
19 new assertions in test_arbiter.py, each one a precedence question someone
will eventually ask in the field. Deployed to the reference site as 0.2.0 and
holding grid within a few watts of zero.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016NckgXecasQb2eSsPYNSW6
Migrated the reference site off the YAML packages and onto the add-on. Every
bug below presented identically: the add-on starts, logs "started", serves its
UI, and cannot do its job.
- run.sh needs #!/usr/bin/with-contenv sh. s6-overlay sanitises the environment
for services, so a plain shebang means SUPERVISOR_TOKEN is absent and every
Core API call is 401 - while homeassistant_api: true makes permissions look
granted. Startup now prints the token length and probes the API.
- Supervisor keys the image by config.yaml `version`, so rebuilding without a
bump reuses the old image. Two fixes appeared not to work because of it.
- Alpine is musl and has no aiohttp wheel on PyPI; deps now come from apk so
nothing compiles on a client's Pi.
- Alpine ships paho-mqtt 1.x, which has no CallbackAPIVersion. That raised at
construction and took the control loop down with it - so MQTT setup is now
wrapped too. Observability must never be able to stop the controller.
- MQTT discovery is published from on_connect: paho silently drops QoS-0
publishes issued before the CONNACK, so the previous code announced nothing
while logging "MQTT connected".
- Repeated failures now log once a minute. Six warnings a second rolled the log
buffer and destroyed the startup diagnostics needed to find the 401.
- auto_start could never fire, because the store's defaults always supplied
auto: False for the fallback to find.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016NckgXecasQb2eSsPYNSW6
Turns the reference RS485 controller into something a technician can install
at a client site: a typed config form instead of YAML, an ingress UI that
names misconfiguration in words, and persistent state that cannot be broken by
a timezone.
Why an add-on rather than YAML packages or blueprints:
- Blueprints cannot create helpers, and the maintenance cycle is a state
machine whose phase and completion date must survive restarts.
- YAML packages need filesystem access, a configuration.yaml edit and a
restart - none of which belong in a client install.
- Add-ons authenticate with SUPERVISOR_TOKEN, so there is no long-lived token
to generate, store or leak on someone else's machine.
- Requires HA OS/Supervised. Container and Core installs cannot run add-ons at
all, which is a market decision, not an oversight.
The control law and the maintenance machine are pure functions with no Home
Assistant imports, and both ship with runnable checks (22 and 22 assertions).
Every assertion corresponds to a rule whose absence caused an observed failure
on hardware - the saturation duration term, the clamp-before-slew ordering, the
deadband, the sign convention.
One behaviour deliberately differs from the implementation it replaces: when
its inputs go missing this commands 0 W rather than replaying the last
setpoint. The reference version kept replaying, which the hardware watchdog
cannot catch - from the ESP32's side, Home Assistant is still talking to it.
Includes the ESPHome firmware (now parameterised: node name, inverter rating,
watchdog timeout) and the optional RS485 e-stop. FIELD-GUIDE.md carries the
commissioning gates, all judged on the wire rather than on how Home Assistant
looks, plus the written statement a site without an e-stop needs signed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016NckgXecasQb2eSsPYNSW6
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