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WalkthroughThe change adds a wrapper that reuses recent control-loop readings for passive power-meter reads. Marstek responses and cloud reports now use the passive-reading path. The powermeter API, wrapper configuration, and related tests use ChangesPassive Reading Flow
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Sequence Diagram(s)sequenceDiagram
participant PowermeterPoll
participant LastReadingPowermeter
participant PassiveReader
PowermeterPoll->>LastReadingPowermeter: get_powermeter_watts() reads and caches values
PassiveReader->>LastReadingPowermeter: get_passive_watts()
alt Cached reading is fresh
LastReadingPowermeter-->>PassiveReader: Return cached values
else No fresh cached reading
LastReadingPowermeter->>LastReadingPowermeter: Read wrapped source
LastReadingPowermeter-->>PassiveReader: Return source values
end
Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
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Docstring coverage is 29.59% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 98 functions across 18 files. (1 skipped:… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Title check The title clearly and concisely describes the main change: passive readers reuse readings from the control loop meter. Description check The description includes the required Why and Checklist sections. It explains the user impact, implementation, behavior, firmware parity, verification, and checklist status. The unchecked web build it… Full details: Description check
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Explanation
The description includes the required Why and Checklist sections. It explains the user impact, implementation, behavior, firmware parity, verification, and checklist status. The unchecked web build item is explicitly marked as not applicable because the pull request has no web changes.
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Full details: Docstring Coverage
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Write docstrings for the functions missing them to satisfy the coverage threshold.
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The Marstek MQTT responder and cloud reporting only report the grid reading, yet each of their polls read a polled meter (Shelly, HTTP, Modbus, ...) again on top of the batteries' own polls. A new innermost LastReadingPowermeter remembers every real read of the source, and the raw read those two use serves it while it is at most 5 s (plus the throttle interval) old, reading the source only when no battery has. Push meters already answer from their cache and pass straight through. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Vv6VhaqsWHbc7sTdpnfNLw
Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Vv6VhaqsWHbc7sTdpnfNLw
The reuse of the control loop's reading hid behind get_powermeter_watts_raw, so nothing at the Marstek responder or cloud reporting said their reads were passive. Rename it get_passive_watts, and _read_grid_phases to _passive_grid_phases, and document the route on the base class. The throttle's override only restated the base wrapper's delegation, so it goes. The unused C++ get_powermeter_watts_raw is deleted to keep the mirrored symbols in step. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Vv6VhaqsWHbc7sTdpnfNLw
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Review comments at @src/astrameter/powermeter/wrappers/last_reading.py:
- Line 59: Update the fallback in the passive read path around
get_powermeter_watts() to coalesce overlapping source reads. Coordinate
in-flight reads so a waiting passive reader rechecks cache freshness before
starting another request, reusing the newly populated cache when fresh.
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CHANGELOG.mdCONTRIBUTING.mdesphome/components/ct002/sensor_backed.hesphome/components/ct002/wrapper_base.hsrc/astrameter/config/addon_test.pysrc/astrameter/config/config_loader.pysrc/astrameter/main.pysrc/astrameter/main_test.pysrc/astrameter/meter_pool.pysrc/astrameter/powermeter/base.pysrc/astrameter/powermeter/wrappers/__init__.pysrc/astrameter/powermeter/wrappers/base.pysrc/astrameter/powermeter/wrappers/conftest.pysrc/astrameter/powermeter/wrappers/health.pysrc/astrameter/powermeter/wrappers/health_test.pysrc/astrameter/powermeter/wrappers/last_reading.pysrc/astrameter/powermeter/wrappers/last_reading_test.pysrc/astrameter/powermeter/wrappers/pid_test.pysrc/astrameter/powermeter/wrappers/throttling.pysrc/astrameter/powermeter/wrappers/throttling_test.pysrc/astrameter/powermeter/wrappers/transform_test.pysrc/astrameter/shelly/shelly_udp_test.py
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A passive read that found no fresh reading read the source even while a battery's read of it, or another passive reader's, was still running, so overlapping reads still cost extra requests. It now waits for the read in flight and checks the cache again before reading the source itself. A read that fails leaves nothing behind, so the passive reader still asks the source and never gets a stale value. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Vv6VhaqsWHbc7sTdpnfNLw
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Review comments at @src/astrameter/powermeter/wrappers/last_reading.py:
- Around line 55-56: Update LastReadingPowermeter’s read coordination so every
active source read remains tracked until it completes, even when a newer read
returns an empty list or fails. Before a passive reader polls the source, make
it wait for any still-active reads rather than relying only on the latest
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Without a throttle above it, battery polls can overlap on the wrapper. It only remembered the newest read, so when that one came back empty or failed first, a passive reader no longer saw the older read still running and started a request of its own. Keep every read in flight in a set and have a passive reader wait until none is left before reading the source. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Vv6VhaqsWHbc7sTdpnfNLw
The regression review found two problems with the passive route. A passive reader waited for every read of the source in flight, re-checked on each pass. With battery polls overlapping and a polled meter down, a new read was always running, so the Marstek responder or cloud report waited for as long as the outage lasted. It now waits only for the reads it found running, then reads the source itself, so the failure surfaces after one timeout of its own. The health wrapper recorded every passive read as an attempt, so a reading served from the cache flipped a meter the control loop had just seen fail back to online. It now records a passive read only when the source answered it, which LastReadingPowermeter.source_reads tells it. Failures are still recorded. Also clamp a negative THROTTLE_INTERVAL to 0 when sizing the cache window, so it no longer means a reading reused for ever, and drop the remaining "raw" from test names. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Vv6VhaqsWHbc7sTdpnfNLw
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Review comments at @src/astrameter/powermeter/wrappers/health.py:
- Around line 137-139: Update the health outcome handling around source_reads in
the passive-read path so it cannot overwrite a newer control failure recorded
while the call was waiting. Track whether this passive call itself performed a
source read, or otherwise preserve the outcome recorded during the wait; do not
use a shared source_reads change alone as evidence that this call produced the
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src/astrameter/config/config_loader.pysrc/astrameter/config/config_loader_test.pysrc/astrameter/main_test.pysrc/astrameter/powermeter/wrappers/health.pysrc/astrameter/powermeter/wrappers/health_test.pysrc/astrameter/powermeter/wrappers/last_reading.pysrc/astrameter/powermeter/wrappers/last_reading_test.pysrc/astrameter/powermeter/wrappers/transform_test.py
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A passive read waiting on overlapping battery reads can be served the one that succeeded after another had already failed. The shared read counter still moved, so the health wrapper recorded the cached success over the newer failure. Track, per calling task, whether the passive read reached the source, and record only then. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Vv6VhaqsWHbc7sTdpnfNLw
Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Vv6VhaqsWHbc7sTdpnfNLw
Only conflict: the two ## Next changelog bullets; both kept. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Vv6VhaqsWHbc7sTdpnfNLw
Only conflict: the ## Next changelog bullets; both kept. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Vv6VhaqsWHbc7sTdpnfNLw
Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Vv6VhaqsWHbc7sTdpnfNLw
Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Vv6VhaqsWHbc7sTdpnfNLw
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Why
The Marstek MQTT responder and cloud reporting only report the grid reading. Even so, each of their polls read a polled meter (Shelly, Tasmota, HTTP, Modbus, …) again, on top of the batteries' own polls. Throttling didn't help, because the raw read they used skipped the throttle on purpose. They should add no load to a meter the batteries are already reading.
An explicit passive route.
Powermeter.get_passive_watts()(formerlyget_powermeter_watts_raw()) is the read for callers that only report the value. Both callers go throughmain._passive_grid_phases()(formerly_read_grid_phases). Control keeps usingget_powermeter_watts().A new innermost wrapper,
LastReadingPowermeter(powermeter/wrappers/last_reading.py), remembers every real read of the source. The passive route then works like this:THROTTLE_INTERVAL. The throttle lets control reads through only that often. A negative interval counts as no throttle.Health: a passive read updates the MQTT Insights Online state and the dashboard's last-read status only when that read itself reached the source. A reading served from the cache was already recorded by the read that fetched it. Reads that finished while the passive read waited may also have recorded something newer, such as a failure. Recording the cached reading again would mark a meter that has failed since as healthy. The wrapper tracks this per calling task, so other tasks' reads in the meantime don't count. Failures are always recorded.
Unchanged: the value is still the source's reading before offset, multiplier and the filters, and the filters never see passive reads. Pipeline listings, including the dashboard's Filters row, leave the wrapper out.
powermeter_namenow walks down to the source, so logs no longer show a wrapper class name.Behaviour change with a throttle: when
THROTTLE_INTERVALis set, the Marstek app and cloud no longer read the meter live past it. They show readings up to 5 s plus the interval old, and keep the last value that long after a meter fails.The throttle's own passive override only repeated the base wrapper's delegation, so it's gone.
Firmware: no behaviour change. Its passive readers already read the sensor cache (
CT002Component::latest_grid_power()). The unused C++get_powermeter_watts_rawis deleted so the mirrored symbols stay in step, andCONTRIBUTING.mdlists the new wrapper as Python-only.Verification (head
6051dd5, which mergesdevelopatc310fb9; each merge conflicted only on the## Nextchangelog bullets, all kept)ruff format,ruff checkandmypy src/are clean.pytest(withmosquittoand the ESPHome CLI installed) passes with no failures. Skips are limited to the ESPHome-CLI and codegen suites. The C++ host gtests (tests/components/ct002, built against a local googletest) all pass.test_passive_read_served_while_waiting_keeps_a_later_failurereproduces this on22df0e3and passes here.last_reading_test.pylikewise each fail against the wrapper as it was before them.esphome compile tests/components/ct002/test.host.yamlsucceeded. No C++ has changed since.Checklist
develop, notmainuv run ruff format . && uv run ruff check . && uv run mypy src/ && uv run pytestweb/changes: rebuilt the dashboard bundle (cd web && npm run build:dashboard) and committed it (noweb/changes)## Nextin CHANGELOG.md🤖 Generated with Claude Code
https://claude.ai/code/session_01Vv6VhaqsWHbc7sTdpnfNLw
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