glenn schrooyenandClaude Opus 5
b59f5ce31b
checks / unit (pull_request) Successful in 7m22s
Rework of the FCST-04 branch against review. Every finding below was proven by a runnable script before it was touched and re-run after; every check added or repaired was driven red by a mutation, `__pycache__` purged first (MUTATION.md, TEST-15). 29/29 test files green. ⚠️ H1 - A SUB-HOURLY FEED WAS DECIMATED TO ONE POINT AN HOUR, AND THE SPREAD WENT WITH IT. `fill_from_yesterday()` keyed the published set as `{_utc_hour(p.start): p for p in r.points}` - LAST POINT OF THE HOUR WINS, the other three dropped. `eneco_eddy` is the Belgian imbalance product and settles per QUARTER, and `_validate_raw()` accepts any strictly-increasing spacing, so this is a shape the product supports today. Measured on a 96-point quarter-hourly feed - ALL FIRM, FULLY PUBLISHED, nothing to carry: the plan reached the optimiser as 15 points, the arbitrage spread fell from 0.143 to 0.014 EUR/kWh, and the cheapest "hour" became a `:45` point whose `at()` window runs into the next one. Not the windowing effect this card is about; a feed losing 84 % of its own prints, with no flag anywhere reporting it. The fill now decides only WHICH WHOLE HOURS NEED CARRYING: every published point inside the window passes through BY IDENTITY, and a carried point is added only for a whole hour with no published coverage at all. Same feed, same fixture: 60 of 60 firm points kept, spread 0.134 over the hours still ahead. ⚠️ AND `_audit()` GOT STRICTER, NOT LOOSER - that was the condition on doing it at all. The old post-condition refused any repeated `_utc_hour`, a count that cannot express four points in one hour. Two rules replace it and SUBSUME it: a published point must BE one of that hour's published points by identity and may be emitted only once; a carried point may stand only in an hour absent from the published set, must be flagged True, and may not repeat. So the duplicated carried hour it existed to catch still raises, the same published point emitted twice now raises, and a carried point sharing an hour with a real print now raises too - which the count never looked at. Three mutations, three reds. ⚠️ H2 - A DAY RECORD THAT WAS NOT A RECORD STOPPED THE ADD-ON FROM STARTING. `_load()` validated `version` and that `days` is a dict, never that each VALUE is one. `{"version": 1, "days": {"2026-01-14": "oops"}}` loaded as ok=True, last_error=None, and then `rec.get(...)` raised AttributeError out of `words`, `yesterday()` and `resolve_tariff()` alike. `PriceHistory(...)` and `.words` are both unguarded in `Controller.__init__`, so the controller did not come up - and it never self-healed, because `_remember()` raised on the same record before it could reach `_save()`. That falsifies the CHANGELOG's "A BROKEN CACHE IS NOT A BROKEN CONTROLLER" in the one direction that matters. The asymmetry that produced it is visible in the file: `_parse_points()` is carefully defensive about every field of a POINT and `_load()` was not defensive about the record holding them. Unusable records are now dropped and REPORTED (`words` says how many and why), and `words` is total by construction as a second line. M3 - `yesterday()` WAS OFF BY ONE DAY FOR 00:00-00:59 AFTER SPRING-FORWARD. `brussels()` renders at the FIXED offset for that instant, so `brussels(stamp) - timedelta(days=1)` subtracts 24 ABSOLUTE hours - and the Brussels day before the March transition is 23 hours long. At 2026-03-30T00:30+02:00 it returned 2026-03-28's prices as "yesterday", or `no_data` naming a date that is not yesterday. The arithmetic is now on the local DATE, which has no offset to lose, and both transitions have a check - the module's headline claim had none. M4 - WITH NO /data THE STORE STILL FILLED, IN MEMORY. `_save()` short-circuited on `not ok` while `_remember()` populated `self._days` anyway: `words` said "unavailable" and `yesterday()` answered A SERIES that is gone on the next restart. The module docstring rejects exactly that ("a yesterday that silently forgets") as its reason for not calling makedirs, so the code now matches the docstring rather than contradicting it. M5 - THE PRUNE MUTATION SURVIVED BECAUSE THE STIMULUS WAS DEGENERATE. §8's clock-jump check seeded ONE day, so `if len(self._days) <= KEEP_DAYS: return` fired and the body it is named after never ran: pruning by arithmetic against the clock - which empties the store on exactly the morning the fill is for - passed the whole 29-file suite. The fixture is now written to a file and reopened (`_load()` does not prune, which is how a store legitimately holds more than the cap) with KEEP_DAYS + 2 days, and the mutant is red. M6 - THE AST ORDERING CHECK COULD NOT CATCH A REVERSAL, AND TWO DOCUMENTS CITED IT AS A GUARANTEE. `_calls.index("_remember") < _calls.index("yesterday")` grades `ast.walk` BFS DEPTH: `self._remember(...)` is a statement and `self.yesterday(...)` is an ARGUMENT of the fill, one level deeper, so `_remember` came out first whichever statement was written first - shipped and reversed both scored True. It is now line numbers AND, the half that matters, the behaviour: a feed carrying yesterday alongside today into an EMPTY store must fill the whole horizon; reversed, the lookup finds nothing and the plan is only the published hours. Reversing the two statements is red on both. L14/L9 - KEEP_DAYS = 3 IS THE STEADY STATE EXACTLY, so a newest-N cap has no slack: a feed publishing to D+2, or ONE stray point in the wrong year - which sorts LAST and can never age out - pushes yesterday out for good. `_prune()` now PINS the two days a lookup can actually ask for on top of the cap. Pinning is additive, so it can only RETAIN and the WITNESS-03 property (nothing is deleted by clock arithmetic) is preserved by construction; `stamp` stops being a dead parameter; the store is bounded at KEEP_DAYS + 2. L8 - the horizon end was not floored while `since` was, so a 48 h request made at any instant off the hour returned 49 points. §1's count was green only because its NOW was exactly :00:00, a shape production never has; the fixture now sits at :17:43. L10 - a failed `_save()` leaked its temp file; at 48 writes a day a persistent write failure leaked 48 inodes a day onto the volume that was already the problem. L15 - `{"version": 1.0}` passed, since `1.0 == 1`. L16 - the `_remember` tree walk scanned `app/*.py` only and matched a bare string; it now parses `app/`, `tools/`, `scenarios/` and `estop/` and looks for the NAME, so a comment does not fail it and a call in `tools/` cannot pass unseen. CLAIM-ACCURACY DEFECTS, WHICH THIS REPO TREATS AS REAL: * L7. DOCS said "*Tariff* on the status page reads `provisional` through the morning". FALSE - `tariff_words` is assigned only from the HA price-entity branch and from `static_status()`, both on the 30 s tick, and the plan's own sentence reaches `_LOG.info`. The doc now says what an operator can see (the Price history row, the Arbitrage row's own refusal sentence, the refresh log line) and a check pins the PAIRING - wiring the plan into the row is fine, correcting the doc is fine, doing one without the other is red. * L11. "fills EVERY unpublished hour" is conditional: a partial yesterday leaves the local hours it never held out of the series (§11.4 for those hours, and `at()` raises rather than answering). Correct behaviour, overclaimed wording, and untested - all three fixed. * L12. DECISIONS §1 leaned on `TariffPlan.cheap_now()`, which has NO PRODUCTION CALLER on the provider plan (`self.cheap` comes from `static_status()`, which builds its own). The conclusion holds on `arbitrage()`'s firm-pair refusal alone, which does reach control; the evidence is now stated at the reach it has. * L13. §1's "passed through by identity" check compared `eur_per_kwh` between two SEPARATE `resolve_tariff()` calls, where `is` could never have held. The value comparison is kept and now says what it grades; identity is graded on a read the file constructs and still holds. * L17. `PriceHistory.words` and the new status row had no check at all - and `words` is one of the two things H2 crashed. Both now have one. * L18. main.py's inline note carried the "widens what the optimiser can SEE, never what it may act on" guarantee without the windowing caveat that the CHANGELOG, DOCS and `resolve_tariff()`'s docstring all carry. It is the one place a maintainer reads it unqualified. EVIDENCE. All eight reviewer proofs re-run: p1/p1b return 29 March, p4 keeps 60 of 60 firm points at spread 0.134, p5 starts and reports, p6 D leaves no temp, p6 E refuses 1.0, p6 F records nothing, p7 returns 48 for 48. p2's script still scores True/True because it re-implements the OLD algorithm - the reversal is now driven as a mutation instead, and is red. p3's script always showed the shipped code correct; what was wrong was the fixture, and its mutant is now red. Twenty mutations driven, no survivors, tree fingerprinted and `__pycache__` purged before each: decimation (2 suites red), audit x3, unfloored `until` (2), unvalidated day records (7 checks), instant-subtraction yesterday, in-memory fill on a volume-less store, clock-arithmetic prune, cap without the pin, leaked temp, loose schema type, empty `words` (5), reversed `carry()` (2), a `_remember` leak in tools/ spelled two ways, a neighbour-filling fallback, a copy instead of identity (2), the DOCS claim in both directions, and the caveat removed from main.py. Baseline and the unmutated tree both green. No option added, config.yaml untouched, and the CHANGELOG entry still picks no version: PKG-07's rule, and only the deployer knows whether 0.9.0's image has been pulled. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01BwRLw7eKYj2byVdwB6kbjU
GoodWe RS485 Controller — Home Assistant add-on repository
Replaces a GoodWe battery inverter's vendor controller with a local one: holds net grid exchange at zero by emulating the inverter's smart meter over RS485, and runs the monthly battery maintenance cycle the vendor box was doing.
repository.yaml add-on repository metadata
goodwe_controller/ the add-on
config.yaml manifest + options schema (the per-site config form)
app/ the controller
control.py the control law — pure functions, no I/O
maintenance.py the monthly cycle state machine
hass.py Supervisor/Core API access
store.py persistent state in /data
mqtt.py optional status entities
web.py ingress UI — routes only, status and configuration
config_page.py the configuration page's markup, style and script
configui.py its field model, built from the Supervisor's own
schema + translations — owns no key, label or rule
selfconfig.py reading and writing this add-on's own options,
with the validate-first / compare-and-swap gate
main.py orchestration, heartbeat, failsafe behaviour
test_control.py runnable checks — no framework needed
test_maintenance.py runnable checks — walks a full cycle in fake time
DOCS.md the add-on's documentation tab
MUTATION.md how to run a mutation so the result means something
tools/mutation_run.sh the mutation harness - purges bytecode, then grades
tools/supervisor_selfapi_probe.py what the Supervisor really permits and
returns, run against its own release image
firmware/goodwe-master.yaml ESPHome config for the T-CAN485
estop/rs485_log.py optional RS485 e-stop / bus witness
docs/GoodWe-RS485-Field-Guide.pdf the guide techs carry (10pp, A4)
docs/build_guide.py its single source - rebuilds the HTML and PDF
FIELD-GUIDE.md how to edit and rebuild the guide
Picking this up after a break? Read HANDOVER.md first — current state,
what is known broken, and what to do next.
Install
Settings → Add-ons → Add-on store → ⋮ → Repositories → add
https://gittea.kammenstraatha.duckdns.org/admin/goodwe-addon
then install GoodWe RS485 Controller.
⚠️ The repository must be PUBLIC for this to work. Home Assistant clones it
anonymously; against a private repo the store shows nothing and gives no useful
error. If it must stay private, install locally instead: copy
goodwe_controller/ into the machine's /addons/ folder, then
ha store reload — it appears as a Local add-on.
⚠️ Bump version: in goodwe_controller/config.yaml for every change.
Supervisor keys the built image by that version, so without a bump it silently
reuses the old image and your fix appears not to work — on your bench and on
every client's machine.
Requires Home Assistant OS or Supervised. Add-ons cannot be installed on HA Container or Core.
Read this first
The inverter holds its last command forever. It has no meter-timeout of its own — a controller that dies mid-command leaves the battery running until a human intervenes. Measured on real hardware: 5 kW of discharge held for 113 seconds after a controller went silent.
Three layers exist because of that, and only the third covers the Home Assistant machine itself dying:
- ESP32 watchdog — no fresh setpoint for ~30 s → command 0 W, and keep commanding it.
- Wind-down before firmware updates — 0 W written before the update starts.
- RS485 e-stop (optional) — writes 0 W after 30 s of total bus silence.
Sites sold without the e-stop must have the acknowledgement in FIELD-GUIDE.md
§10 signed.
Development
The control law and the maintenance machine are pure Python with no Home Assistant imports, so they run anywhere:
cd goodwe_controller
python3 test_control.py
python3 test_maintenance.py
Both must pass before shipping any change. To prove a check bites - the way
almost every claim in this repository was established - mutate the module and
run tools/mutation_run.sh, which clears __pycache__ first. It is not
optional: a same-size edit reverted inside one second leaves CPython reusing the
old bytecode, and the run grades code that is not there. goodwe_controller/MUTATION.md
has the mechanism, the measurement, and what the flags do not do. They are not unit-test theatre —
each assertion corresponds to a rule whose absence produced an observed failure
on real hardware, and the comments in control.py say which.
Compatibility
Check the serial number, not the model name. Characters 6-8 of the serial are the platform tag:
| tag | platform | verdict |
|---|---|---|
ESU EMU ESA BPS BPU EMJ IJL |
105 — ES/EM/BP, AA55-era meter bus | supported |
SPB SPN |
745 — SBP G2 (GW…-SBP-20) |
no |
ESN ESC |
745 — ES G2 (GW…-ES-20) |
no |
ETU EHU BTU … |
205/745/753 — ET/EH/BT hybrids | no |
SDT DST MSU NSU … |
PV-only inverters — no battery to control | no |
A "-20" or "G2" suffix means a different platform with a different meter
protocol. The tags come from the goodwe library's PLATFORM_105_MODELS, which
is also what Home Assistant's own integration uses to pick a protocol.
- GoodWe ES / BP family inverters (AA55 / RS485 meter-bus generation)
- The protocol is reverse-engineered. There is no vendor contract, and a firmware change on GoodWe's side could break every installation at once. Say so when you sell it.