A survey of every laundry diagnostics dump attached to an issue turned up 14
devices, 4 of which carry cloud-course tokens. Two were already known; the
two new ones are both useful, and one contradicts something the
investigation write-up asserted.
A DW5000C dishwasher (issues #113/#123) advertises four downloaded programs
and carries no payload token for any of them. That is a shape the corpus
didn't have: the feature is not washer-only (DA_DW, not DA_WM), and a device
can name programs whose payloads have never been observed. The existing code
already handles it correctly -- nothing learnable, nothing offered, gap still
counted for the Repairs issue -- so this adds the fixture, golden, and tests
that keep it that way.
A second WW5000C (issues #259/#343, firmware _B048) holds the same saved
program as the first one's captured "Towels", and the two payloads differ at
exactly one byte: byte 3, 04 against 06. Everything else -- id, slot, all
four varying tag values, the whole tail -- is identical. So byte 3 is neither
a per-board constant nor a property of the program, and the doc's claim that
it is always 04 on this board was wrong.
That is also the strongest argument yet for learning payloads per device: a
catalog keyed on program id would have shipped one unit's byte 3 to the
other. Nothing changes in the implementation as a result -- it never had a
catalog -- but the reasoning is now backed by evidence rather than caution.
Also recorded: both WW5000C units advertise the byte-identical slot list
despite different firmware, so the program set looks factory- or
region-assigned rather than user-curated; and a sentinel's byte 2 equals the
selected course on one dump but not the other, so it stays unused.
Byte-aligning the WA55A7700AV's 16-byte payload against the WW5000C's
20-byte one: identical header, and the first four tag/value pairs are the
same tags in the same order at the same offsets -- the part that carries
per-program data has one shape on both boards. The whole width difference
is two trailing pairs the WA55 doesn't carry, and on the WW5000C that
trailing section is byte-identical across all nine programs, so it isn't
program data at all.
Doesn't change the conclusion -- the four shared tags carry non-overlapping
value ranges between the boards, so the encoding is still board-specific and
blobs are still replayed whole. Also records why the WA55's /washer/vs/0
readings can't be used to confirm a decode: that unit is on a local course,
not its cloud course.
A washer whose course table includes "Download"/"Downloaded" runs whichever
program the SmartThings cloud last pushed down. Those programs are now
selectable from the ordinary cycle select, so a downloaded Jeans or Sports
cycle can be started without giving the appliance internet access.
The device turns out to enumerate them itself. `CloudExtraCourse_` on
/course/vs/0 lists one byte per downloaded program, and byte 2 of a
program's payload is exactly that slot id -- verified against all nine
programs on the reporter's WW5000C and against the WA55A7700AV dump already
in the corpus. So nothing here is hardcoded: the appliance says which
programs exist, the payloads are learned by watching what it reports, and
the names come from the user.
That last part is unavoidable rather than a shortcut. A payload is only
visible while its program is loaded, and the appliance never reports a name
for one. So cloudcourse.py persists what has been seen (same rationale as
learned.py's mode store), a Repairs issue tells the owner how many programs
are still unaccounted for, and an options-flow step collects the names. A
program appears in the cycle select only once it is both learned and named.
Selecting one issues the only two-token options write in the codebase --
the course token has to switch to Download in the same write, or the
appliance accepts the program token and silently ignores it (confirmed on
hardware). The Download course code is learned by observation but never
applied until the user confirms it: tokens in this array are replaced by
prefix and never evicted, so a stale program token can appear alongside an
unrelated course, and acting on that would start the wrong wash cycle. For
the same reason a stale token is never reported as the running program.
Also of note:
- There is no single "Download" course code. The WW5000C uses 87, the
WA55A7700AV uses 17 -- same Table_02. Any per-table lookup would have
been wrong on one of the only two devices available to check.
- Payloads are replayed byte-for-byte and never decomposed or rebuilt.
Bytes 5/7/9 do decode to temperature/rinse/spin on the WW5000C, 9 for 9,
and produce nonsense on the WA55A7700AV -- so that decode is written up
in docs/investigations/download-cycle.md and not shipped, and the
read-only sensors it would have enabled were dropped.
- The store reaches the registry as a namespaced synthetic field merged
onto /course/vs/0's rep at read time, so exists_fn/rep_fn/options/write_fn
all see it through their existing signatures. It never enters the state
cache, so it can't be polled over, written to the device, or land in a
diagnostics dump.
- A name that would render identically to another cycle in the same
dropdown is rejected in the flow: the select maps a chosen label back to
a raw value by matching display text.
Non-English catalogs carry the new strings in English for now; they need
real translations.
FilterCleanAlarm_Clear, through the same single-token options merge as every
other setting on /mode/vs/0. Measured on an ARTIK051_KRAC_18K: 2.04 Changed and
FilterTime_95 (9 h 30 min) -> FilterTime_0, still zero on a fresh DTLS session
and on every poll after; none of the other 17 tokens moved and the alarm
entries stayed Deleted.
The counter has had no reset until now, and the descriptor said so: two earlier
rounds against live hardware failed, and the conclusion drawn from them was
that the reset had to be cloud-only. That conclusion was wrong, and the way it
was reached is the interesting part -- it came from diffing every resource the
appliance reports before and after pressing reset in Samsung's app, which
showed only the counter zeroing and the alarm clearing. A trigger token cannot
show up in such a diff, because a trigger is never stored. The appliance's own
app sends this token and skips the write when the counter is already zero.
Both failures stay in the comment, because they say what this is not: writing
FilterTime_0 (the value is not writable -- 5595 -> 5595 after 69 s, 1925 ->
1925 after 65 s, two units, opposite power states), and POSTing the cloud
capability's command name to /actions/vs/0 (real name, wrong transport).
Gated on the FilterTime_ token, so it appears only where there is a counter to
reset; newer boards report filter usage through their own resource and would
need a different mechanism.
CONTRIBUTING.md gains a "Code comments" section: comment the why not
the what, keep it to a sentence or two with a pointer to the load-bearing
evidence, don't re-derive a sibling's already-documented reasoning, and
move failed-attempt investigation logs out of inline comments.
Applied that policy across the codebase: condensed sprawling module
docstrings, per-entity essays, and multi-paragraph rationale blocks down
to their load-bearing conclusions, while preserving the actual "why"
(issue numbers, calibration evidence, gotchas, don't-guess rationale).
No functional code changed — verified via diff review, ruff, ty, and the
full pytest suite (1211 passed).
One inline investigation log (the AC filter-reset "tried and failed"
notes) moved to docs/investigations/ac-filter-reset.md rather than being
deleted, per the new guideline on where that kind of record belongs.
Marc Billow