Name the onboarding hotspot per device, not per board - #80
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📝 WalkthroughWalkthroughThe portal now generates a MAC-derived ChangesPortal SSID flow
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The portal naming and QR behavior are implemented, but the implementation plan still describes an outdated QR-generation path, which could mislead future maintenance. The PR is mergeable with explicit documentation follow-up. Sequence Diagram(s)sequenceDiagram
participant WiFiTask
participant AppCore
participant UI
participant QRCode
WiFiTask->>AppCore: Emit PortalUp with PSK and MAC-derived SSID
AppCore->>UI: Reduce PortalUp into UI sync status
UI->>QRCode: Encode SSID, PSK, and temporary credential
UI->>UI: Render QR code and SSID join caption
Possibly related PRs
Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In `@docs/IMPLEMENTATION_PLAN.md`:
- Line 240: Update the onboarding paragraph in IMPLEMENTATION_PLAN.md to state
that ui/src/render.rs generates the join QR at render time using PortalSsid and
the session PSK, replacing the stale reference to tools/generate_qr.py.
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fixtures/golden/sync-portal-qr-x3.pngis excluded by!**/*.pngfixtures/golden/sync-portal-qr.pngis excluded by!**/*.png
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app-core/src/lib.rsdocs/ARCHITECTURE.mddocs/IMPLEMENTATION_PLAN.mdfw/src/tasks/wifi.rstools/emulator/src/scenario.rstools/web-emulator/src/lib.rsui/src/app_render.rsui/src/join_qr.rsui/src/lib.rsui/src/render.rs
The hotspot was `XTEINK-X3` or `XTEINK-X4`, chosen at build time from the
board feature. Two problems, and the vendor's name in it is the smaller one.
A name that says which model a device is cannot tell two of that model
apart. The screen tells you to join the network it names, so that name has
to match exactly one entry in a Wi-Fi list -- and some clients collapse
identical SSIDs into a single row, which leaves no way to pick at all. Two
readers on a desk is the ordinary case for anyone with more than one, and
this is the flow they meet first.
So the name comes from the low three bytes of the MAC: `CALENDULA-2A2D6C`.
Three because that is the widest device-specific part a MAC is sure to carry:
no IEEE allocation block holds more than 2^24 addresses, so two readers whose
MACs come from one block cannot share a name. Between blocks they can, and
one vendor may hold several -- so "same silicon" does not settle it either.
No single likelihood covers that case: a 24-bit allocation prefix leaves all
three bytes varying, a 36-bit one leaves twelve bits, so how much of the tail
is free depends on how the blocks were handed out. This is a discriminator,
not an identifier, and the comment says so rather than quoting a number that
would read as a guarantee. It is also nothing to remember when a new board is
ported: there is no arm to add, because there is no board in it.
The firmware is the only layer that can read a MAC, so the name rides
`SyncEvent::PortalUp` beside the session PSK, which already travels that way
for the same reason. One string then beacons, renders and encodes, so the AP
and the QR cannot drift.
`PortalSsid` stores the three MAC bytes rather than the finished sixteen
characters. Ten of those characters are a prefix that never changes, and the
value sits in a `RenderRequest` four deep in a channel: keeping it to the
three that vary costs the channel 32 bytes instead of 64, and the size-budget
test records the 112 -> 120 that remains.
## Verification
`tools/check.sh all` passes. Two golden frames move -- `sync-portal-qr` on
both devices, the only screen that draws the name -- and the regenerated ones
read `scan to join "CALENDULA-DE110A"` around a version-4 symbol, from the
emulator's fixed demo value.
`join_qr` gains a test that two devices encode different symbols, since a QR
carrying one reader's network on another's screen would join the wrong one.
Its payload test now names what it measures: 50 bytes for this SSID and a
16-character PSK, still inside version 4's 62 at EC level M.
Hardware, on an X3 whose MAC the flasher reported as `f8:5b:1b:fd:2d:6c`
before any of this ran: the portal came up as `CALENDULA-FD2D6C`. Predicting
the name first is what makes that check mean anything -- a wrong byte index
yields a plausible name rather than a failure, so a log read after the fact
would have agreed with itself either way.
The round trip is the stronger half. Forgetting the saved network raised the
portal, and the credentials went back in through it:
storage: wifi credentials forgotten=true
portal: up at 192.168.4.1 as CALENDULA-FD2D6C
storage: wifi credentials written=true confirmed=true
wifi: up at 192.168.1.158
Joining a network found from the screen and the QR is the only check that
covers all three surfaces at once; had the beacon, the caption or the payload
disagreed, there would have been nothing to join. Three boots and a full
portal cycle, no faults, and the card came through with its catalog and
reading position intact.
An independent scan of the beacon was not possible: macOS redacts SSIDs from
`system_profiler` without location permission, and the `airport` tool it
replaced is gone. The join covers it.
The dev-credential environment variables move with it:
`XTEINK_WIFI_SSID`/`_PASS` become `CALENDULA_WIFI_SSID`/`_PASS`, and the two
`XTEINK_KOSYNC_*` names the plan document lists follow for consistency.
That rename is silent for anyone still exporting the old ones. `option_env!`
yields `None` for a name that is not set, and no compile-time credentials is
a valid state -- it is what makes the device raise the onboarding portal. So
a stale build script does not fail to build, it produces a firmware that
comes up asking to be onboarded. Worth knowing before wondering why.
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The document was last reconciled on 2026-08-13. Ten merges landed after it, #79 through #88, and the four library PRDs were written in the same window without either side citing the other. Tier 1 was re-verified against the code and stands unchanged. A13's SETTLE_MS, A12's unvaried CDI_INTERVAL, the absent frame-identity guard behind A14, and C2's untouched sleep path are all still there, because WS-A and WS-C saw no substantive commits in the interval. The top of the queue is the part of this roadmap that aged best. What had drifted: - opt/upload-session-token no longer merges. Eight files conflict, including both portal QR goldens, and the cause is #79 and #80 renaming the card layout and the onboarding hotspot per device. The residual column now says so. - F11 was closed by #58, which added a bench harness step to ci.yml. Item 11 shrinks to F10, which still stands: pages.yml has the right path filters and no pull_request trigger, so a broken wasm merges green. - Item 5 needs its upload baseline re-taken a second time. #87 put a streaming SHA-256 in StagedUpload::write, so wall time now carries a per-byte CPU cost the 72% arithmetic does not account for, and the instrumentation has to separate hash from write. - WS-B and WS-D no longer own their regions alone. The library work is implemented in proto/, reader-cache/, upload-store/ and sd_session.rs from a different document, so hazard 5 is rewritten and a hazard 6 points at the four PRDs. - WS-B's pipeline baselines predate folder browsing. They were taken on a flat /BOOKS card and #88 catalogs at depth, so the scan side needs re-taking. The folder figures that do exist are cited from ARCHITECTURE.md. - C11 cited fw/src/main.rs:365, now :367. Two doc-drift entries turned out to be resolved already. docs/agents/bench.md carries the cadence and coalesced/unmatched rules, AGENTS.md names tools/check.sh stack-frames, and the Python 3.11 caveat died with Tier 0a in #58 now that the repo pins 3.14. #87 and #88 join the Landed table on the same grounds #75 did. Neither is a performance change, and each one moved a performance item.
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Verification
Before requesting review, please confirm you have run the appropriate checks:
tools/check.sh fmtpassedtools/check.sh fastpassed (host Clippy and tests)tools/check.sh emulatorpassed (emulator tests and goldens)tools/check.sh firmwarepassed (firmware Clippy and release builds)tools/check.sh allpassed (required before the pull request is considered ready)Skipped checks
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Description
Give each device a stable, device-neutral portal SSID derived from its factory MAC address instead of tying the hotspot name to a specific hardware model.
The portal now advertises as:
where the suffix is derived from the low 24 bits of the device's base MAC.
Why
Model-specific hotspot names do not scale as CalendulaOS gains support for more devices, and multiple readers advertising the same SSID are difficult to distinguish when they are nearby.
Using a MAC-derived suffix gives each reader a short, stable discriminator while keeping the portal name independent of the board model.
Changes
PortalSsidas the shared representation of the portal network name.RenderRequestsize increase.Validation
tools/check.sh allSummary by CodeRabbit
New Features
CALENDULA-SSID based on the device’s MAC address.Improvements
CALENDULA_WIFI_SSIDandCALENDULA_WIFI_PASS.