glenn schrooyenandClaude Opus 5
611d3dbcdf
1. notes_of() could not tell this guard's alarm from anybody else's. It selected by SERVICE, so against #12's app/ (which adds goodwe_output_clamp) eight assertions went red, AC1's core check among them. Blanket id-keying is not the repair and was measured, not guessed: selector vs #12's app/ id renamed by service (as committed) 8 red 1 red by id alone 3 red 6 red by id or title (shipped) 3 red 1 red all_notes_of() is the whole surface; notes_of() is this guard's, recognised by the id it should carry OR the title it writes - the `or` is what keeps the one assertion whose subject IS the id able to fail on its own. The three surface-wide claims stay surface-wide, each with a comment naming which surface it is about and why the next guard's author must decide rather than narrow them. They are the three that go red against #12, which is the correct signal. 2. The ordering comment named the wrong boundary. N3 - moving the call to immediately before write_setpoint() - is green and correctly so: self.target is assigned two lines earlier, write_setpoint() clamps only a local and can skip the write entirely. So the invariant is "after `self.target = resolution.target_w`", and the detector grades pre-clamp INTENT, not the wire. Corrected in test_freeze.py and in main.py's own note above the call (comment-only; I merge second and own the conflict). N8 - moving the call above the assignment - is RED 4. 3. The schema range's own bounds are now pinned. int(60,3600) -> int(1,86400) survived green: an operator could set meter_freeze_s: 86400 and the guard is dead with nothing red. Both bounds are re-derived rather than restated. 4. find_hwsim() crashed the whole suite on a checkout one level below the root (HERE.parents[1] -> IndexError, reproduced at C:/goodwe_controller). Guarded. And part 3 now names its transport in the summary: the rig hwsim and the stub are not equivalent - the rig path failed 1 run in 3 - so a green log has to say which one backed it. Also: the "revived transport re-rails" check is labelled a PRECONDITION like its sibling; freeze_rows() records that flipping p1_enabled exercises the row's content and never its gate; and the note about the deleted assertion is corrected - it was REDUNDANT, not undecidable. The reviewer falsified it in one line (move the hass.call above `if not fired: return`, RED 9). "I could not construct a falsifier, therefore it cannot fail" was exactly the inference this file exists to distrust. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015VXjA3LWccN1rJsk3okyPC
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
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
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. 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.