Akari Pulse

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Research notes and a working reference implementation for getting health data off a vivo WATCH GT (first-generation Bluetooth model, WA2456C, BlueOS 3.0) into a self-hosted backend and MCP server. The full chain — watch RPK → Cloudflare relay → drain into a local Node.js service → SQLite → MCP over stdio and Streamable HTTP — was verified end-to-end on a real device on 2026-08-12; the exact evidence is in docs/REAL_DEVICE_RESULTS.md.

Status: reference / research. Published as-is with no maintenance or support promise. Not affiliated with, endorsed by, or sponsored by vivo. Every endpoint, database ID, and token in the runnable code and configs has been replaced with a placeholder (REPLACE_WITH_* or pulse.example.com) — bring your own Cloudflare Worker, D1 database, VPS, and tunnel; nothing points at anyone else's infrastructure by default. Narrative documentation still names the domains the author's own deployment used (pulse.yoru-and-akari.dev, pulse-mcp.yoru-and-akari.dev) because they are part of the verified-deployment story on 2026-08-12.

Privacy note: this project handles real personal health data. Run your own relay, database, and MCP; do not point this at a third party's infrastructure or someone else's watch. RPK binaries are deliberately not shipped because they bake the private ingest token in — see artifacts/README.md.

The RPK sideloading path relies on the OrbitV community's work; without it the watch could not receive an unsigned developer build at all.

Akari Pulse is a private, inspectable health-data path for Yoru's first-generation Bluetooth vivo WATCH GT:

WA2456C / BlueOS 3.0
  -> BlueOS health + sensor APIs
  -> durable on-watch queue
  -> HTTPS via the paired phone's Bluetooth internet proxy
  -> Cloudflare Worker relay (D1 buffer)
  -> drained into the Akari Health service (Node.js + SQLite)
  -> independent Akari Health MCP (stdio / Streamable HTTP)
  -> ChatGPT / Claude

(Android bridge retained in-tree as a fallback receiver only)

The repository contains real watch, Android, service, and MCP implementations. It does not contain demo health values, vivo developer credentials, account tokens, or private signing keys. A host build is not reported as a real-watch success. Confirmed WA2456C / DPD2346C_A_1.54.5 observations and unresolved reboot boundaries are recorded separately from host evidence in REAL_DEVICE_RESULTS.md.

Current delivery status

Layer	Host result	Real-device result
BlueOS watch app	0.1.5 evidence-and-boundary RPK built with the BlueOS Studio toolchain (superset of 0.1.4; adds ZERO_SENTINEL and raw-payload evidence in collect stats, per-metric layer breakdown, and a new probe sleep button)	0.1.2 passed the full isolated health chain (3/3 cold-start full-pipeline passes, no reboot); 0.1.3 net probe and send batch https passed on 2026-08-12; 0.1.4 all three collect+sync buttons verified 2026-08-12 — real nonzero HR, SpO2, stress, resting HR landed in the VPS store end-to-end; 0.1.5 (versionCode 6, SHA-256 C8AFBE32446E30D745CBCFE68C8C7D5DA101B7B58DD78CCD52167C2D7343AE76, 89,461 bytes) device-verified 2026-08-12: sentinel rule confirmed, SUM-stats and sleep boundaries conclusively established, NOT_APPLICABLE layer semantics live (see REAL_DEVICE_RESULTS.md)
Watch health chain	one-test-per-launch harness	PASS — getRecentSamples([HEART_RATE]) → callback → parse → UI → queue → snapshot → storage is stable; do not rework without new failing evidence
Official BlueXlink RPC	public watch API and official Android AAR integrated	closed: transport init fails with code=1001 interconnectfeature error; support table lists only WATCH 3; vivo appid/encryStr unobtainable — see RESEARCH.md
Cloudflare relay	deployed at https://pulse.yoru-and-akari.dev; ingest/replay/conflict/auth smoke-tested	PASS 2026-08-12 — the real watch reached the relay over HTTPS (~4 s TLS) and its batch was stored and acknowledged 3 s after sent_at
Akari Health service	authenticated routes tested against temporary databases	PASS 2026-08-12 — the drained physical-watch batch (2 events) is in the local SQLite store of record
Akari Health MCP	official SDK client lists and invokes all 14 tools	PASS 2026-08-12 — health_latest returned the physical-watch record through the real stdio MCP
Always-on VPS + remote MCP	deployed on the Tokyo VPS (systemd: service, 2-min drain timer, Streamable-HTTP MCP, Cloudflare Tunnel)	PASS 2026-08-12 — official StreamableHTTPClientTransport listed 14 tools and returned the watch record via https://pulse-mcp.yoru-and-akari.dev/mcp/<secret>; see deploy/tokyo
Android bridge	debug APK built, unit-tested, linted, and signature-checked	fallback only; not on the active path

See REAL_DEVICE_RESULTS.md and DIAGNOSTICS.md for the exact evidence and adaptive one-test-per-launch sequence.

Current artifact (0.1.5, device-verified 2026-08-12): keeps every 0.1.4 button unchanged; tightens collect stats with the ZERO_SENTINEL rule for heart_rate_today_max/min and raw-payload evidence in every stat event; changes the sample_acquisition layer diag to a per-metric breakdown message; adds one new one-per-launch button probe sleep that records SLEEP_STATUS/SLEEP_UNIT/SLEEP_STAGES via getRecentSamples. Device results: sentinel rule confirmed, SUM-stats conclusively empty-object ({}, no fields), sleep boundaries established (instantaneous SLEEP_STATUS only; SLEEP_UNIT, SLEEP_STAGES, and health.getStatistic all unavailable), NOT_APPLICABLE layer semantics live. VPS store: 94 records (67 PASS, 25 NO_DATA, 2 ERROR). See REAL_DEVICE_RESULTS.md for the full acceptance results and DIAGNOSTICS.md for the tightened contracts and device quirks.

Previous device-verified artifact (0.1.4, 2026-08-12): all three collect+sync buttons passed end-to-end — real nonzero HR (62 bpm live, 61 resting), SpO2 (99 %), stress (35) landed in the VPS store and are queryable via the remote MCP. Daily SUM statistics all returned empty (device capability boundary — the outstanding question the 0.1.5 raw-payload dump resolved conclusively).

Final host-built deliverables (2026-08-11, watch 0.1.3 added 2026-08-12, watch 0.1.4 added 2026-08-12, watch 0.1.5 added 2026-08-12):

Binaries are not distributed in this repository (see artifacts/README.md); the table below is the historical hash record of the privately built and device-verified artifacts.

Artifact	Bytes	SHA-256
akari-pulse-android-debug-0.1.0.apk	31,164,014	D5F43C1D2F0468DF7CF71594320DE9E9748DB2410D480361E825A3ACC570C6D5
akari-pulse-watch-debug-0.1.5.rpk	89,461	C8AFBE32446E30D745CBCFE68C8C7D5DA101B7B58DD78CCD52167C2D7343AE76
akari-pulse-watch-debug-0.1.4.rpk	84,899	AF16F9E39CEBB67AB79408B03668907CD40BBBFB6F6705599A9C8808FC63372B
akari-pulse-watch-debug-0.1.3.rpk	75,466	BFCCEA5B7181BFE20C7B547EA05E5025DC7DE76703A98A60D75BF95D1328E0A1
akari-pulse-watch-debug-0.1.2.rpk	69,649	D5A368469F556A379575178ACFA57530D35546D44742433788F13ED8EE0E98C6
akari-pulse-server-0.1.0.tgz	15,674	58AEC6FC70C221D0E910AB2820CA2512AE4F058F1E29E0B18532A19E88C2A07C
akari-pulse-mcp-0.1.0.tgz	8,757	7D7DA216EBF343045282EB335863184E5DAC23BF289452CA03B76FD3409DD3C1

The Cloudflare relay is deployed from relay/ (Worker akari-pulse-relay, D1 akari-pulse-relay, custom domain pulse.yoru-and-akari.dev); its tokens live in Cloudflare secrets and the untracked relay/.secrets.local.

The machine-readable list, APK signer certificate digest, and vendored AAR digest are in SHA256SUMS.txt.

Repository

akari-pulse/
|-- watch/       BlueOS health collection, durable queue, HTTPS/RPC adapters, diagnostics UI
|-- relay/       Cloudflare Worker ingest buffer (pulse.yoru-and-akari.dev) and D1 schema
|-- android/     fallback bridge: Room inbox/outbox, official vivo RPC receiver, HTTP probe receiver
|-- server/      Node.js 24 HTTP service and SQLite persistence
|-- mcp/         independent MCP (stdio + Streamable HTTP) using the official TypeScript SDK
|-- deploy/      Tokyo VPS systemd units and runbook (always-on store + remote MCP)
|-- contracts/   strict shared event and batch schemas
|-- scripts/     install, start, smoke, relay-drain, and exact-tailnet-bind scripts
|-- docs/        architecture, research, diagnostics, testing, and real-device evidence
`-- artifacts/   built deliverables and SHA-256 manifest

Architecture choice

The production route is watch-direct HTTPS: @blueos.network.fetch POSTs the batch contract to the Cloudflare relay at pulse.yoru-and-akari.dev, which buffers in D1 and is drained into the local Akari Health service by scripts/drain-relay.mjs. vivo's official BlueXlink/device RPC pair was the original candidate and is now closed on this hardware: the real WA2456C fails at interconnect connection time with code=1001 interconnectfeature error, the official support table lists only vivo WATCH 3, and the required vivo appid/encryStr are not obtainable for this project. Evidence and classification live in RESEARCH.md; the Android bridge remains buildable as a fallback receiver. OrbitV is used for RPK sideloading only and is not treated as a generic bridge API.

Every transport shares one durable contract. A receiver acknowledges a watch batch only after durable storage (relay: D1 insert; Android: Room transaction), and the watch dequeues only after a matching batch_id plus exact accepted/duplicate counts. The relay is drained — rows deleted — only after the local service acknowledges the same batch, so no layer drops data it has not handed off.

The backend is a local Node.js 24 service backed by node:sqlite. The MCP calls that service rather than opening the database, exposes read-only raw-health tools plus non-destructive start/stop session metadata actions, and does not modify the existing Akari Surface Desktop MCP.

Details and evidence are in ARCHITECTURE.md and RESEARCH.md.

Prerequisites

• Windows PowerShell 7 or Windows PowerShell 5.1.
• Node.js 24 or newer for the service and MCP.
• JDK 17 and Android SDK API 35 for rebuilding the Android app.
• BlueOS Studio 2.x, including its bundled Node.js and blueos-pack, for rebuilding the RPK.
• Optional: Tailscale for phone-to-Windows private-network access.
• For official vivo RPC at runtime: a vivo developer appid, intelligent-terminal SDK key (encryStr), vivo Health on the phone, and a package/signing-fingerprint pair accepted by the watch.

Install and verify the service/MCP

From the repository root:

.\scripts\install.ps1
.\scripts\verify-service.ps1

Start the loopback service:

.\scripts\start-server.ps1

To bind only the machine's current Tailscale IPv4, first provide a strong bearer token:

$env:AKARI_HEALTH_TOKEN = '<strong-random-token>'
.\scripts\start-server-tailnet.ps1

The tailnet script reads the exact IPv4 from tailscale ip -4. It does not run tailscale up, alter grants, change Windows Firewall, or modify an existing Serve/Funnel configuration.

Start the independent MCP in another terminal:

$env:AKARI_HEALTH_URL = 'http://127.0.0.1:8787'
$env:AKARI_HEALTH_TOKEN = '<same-token-if-configured>'
.\scripts\start-mcp.ps1

Ready-to-edit client examples are codex.example.toml and claude-desktop.example.json. Keep the bearer token in the local environment/config only; do not commit it.

Build and configure Android

The official public AAR is vendored at android/app/libs/device-rpc-1.0.0.17.aar with its SHA-256 sidecar. To rebuild, put only local machine values in the ignored android/local.properties:

sdk.dir=C\:\\Users\\<you>\\AppData\\Local\\Android\\Sdk
VIVO_RPC_APP_ID=<numeric-vivo-appid>

If no app ID is available, omit the second line; the APK still builds and the UI truthfully reports official RPC as API_MISSING. Build and validate:

Set-Location .\android
.\gradlew.bat testDebugUnitTest assembleDebug lintDebug --no-daemon --max-workers=1
.\scripts\verify-device-rpc.ps1

Install the resulting debug APK with Android Studio or:

adb install -r .\app\build\outputs\apk\debug\app-debug.apk

In the app, configure the Akari Health base URL/token. Enter encryStr in the secure runtime field only; Android Keystore encrypts it at rest. Start official vivo rpc only after the app ID and key exist. The session notification controls are explicitly best-effort: dispatch does not confirm watch execution or create the backend session.

The debug-only HTTP receiver permits cleartext for a controlled loopback/tailnet probe. A non-loopback listener requires a separate bridge token of at least 16 characters. Release builds reject cleartext service URLs.

Build and configure the watch

The watch app calls the current official modules directly:

• @blueos.health.health with watch.permission.READ_HEALTH_DATA;
• @blueos.hardware.sensor.sensor with watch.permission.STEP_COUNTER;
• @blueos.bluexlink.connectionManager for the production RPC candidate;
• @blueos.network.fetch for the explicit HTTP probe.

Before a paired RPC build, set watch/src/config.js phonePackage to dev.akari.pulse.bridge and phoneSha256 to the SHA-256 signer fingerprint of the exact APK being installed. Rebuilding the APK with a different debug/developer certificate changes that fingerprint and requires rebuilding the RPK.

Use the build command documented in watch/README.md, then install the RPK through the current OrbitV sideload flow. The checked-in project never carries a watch signing private key. BlueOS Studio's debug builder may generate a local debug signature; a release RPK requires the operator's own developer certificate and key.

Since 0.1.3 the watch adapter defaults to http against your relay's /v1/health/batches endpoint with your ingest token compiled in via watch/src/config.js (placeholders pulse.example.com / REPLACE_WITH_YOUR_INGEST_TOKEN in this repository). Rotating that token requires wrangler secret put INGEST_TOKEN (or the REST equivalent) plus a watch rebuild. Pointing the adapter at the Android LAN listener instead is a fallback: set an address the physical watch can actually reach and the Android bridge token; 127.0.0.1:23102 is deliberately not claimed to map to the phone on a real watch.

Data and failure semantics

Every observation is one immutable event containing the producer timestamp, metric, source device, status, and optional real value/sample timestamp/callback delta/session/error. PASS requires a real value. Missing or failed measurements remain NO_DATA, DENIED, UNSUPPORTED, API_MISSING, or ERROR; no layer substitutes zero or a stale value.

Failures are attributed to watch_module_api, permission, sample_acquisition, watch_transport, phone_receive, phone_persistence, uplink, backend_ingest, database, or mcp_query. Follow DIAGNOSTICS.md from the first non-PASS layer.

Raw health records have no update/delete HTTP or MCP route. Session summaries may calculate baseline, peak, delta, latency-to-rise, and time-to-peak from real samples and timestamped events, but they state that temporal association does not establish causality.

Tests and artifacts

The complete reproducible verification record is TESTING.md. Built files and their checksums are under artifacts; use SHA256SUMS.txt rather than assuming similarly named local builds are identical.

Do not interpret an RPK/APK build, an RPC send callback, a simulator request, or /healthz as a physical-watch end-to-end pass. Only update REAL_DEVICE_RESULTS.md after capturing evidence from the named baseline without including tokens, SDK keys, serial numbers, MAC addresses, cookies, or account identifiers.