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mrambossekandClaude Fable 5 14e5fad1b2 engine: downstream MTU and downstream train in the measurement document
Three facts the client cannot produce alone, kept deliberately separate:
mtu.pmtud_down (largest datagram that arrives unfragmented — meaningful only
because the server sets DF), mtu.frag_delivery (whether larger ones arrive once
fragmentation is allowed), and train.udp_downstream (loss, reordering and
arrival spacing in the download direction, which a round trip cannot separate
from upstream loss).

ServerMeasurement now runs them on the same ProbeSession as the echo train. It
had to: a fresh session restarts client-side sequence numbers and the server's
anti-replay window discards the lot, so the re-primed source is never recorded
and every granted send goes to a socket that has already closed. That produced
four confidently-wrong FAILED tests and a RED verdict on a healthy network.

Live against fmr: path MTU 1500, fragments to 4000, 100/100 downstream, GREEN.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-08-01 10:54:38 +02:00

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# Echolot website (`web/`)
Minimal single-page site for [echo-lot.app](https://echo-lot.app), served from Cloudflare
Workers. Static files in `public/` are served straight from the edge; the tiny Worker in
`src/index.js` only runs for paths that aren't files:
| Path | Behavior |
| ------------- | ------------------------------------------------------------------------ |
| `/apk` | 302 → newest `.apk` asset of the latest Gitea release (QR-code friendly) |
| `/apk.sha256` | 302 → the matching `.sha256` asset |
| `/api/latest` | JSON `{version, published_at, apk, sha256}` — the homepage's version readout |
| `/fdroid`, `/source` | 302 → the URLs configured in `wrangler.jsonc` vars |
The latest release is resolved from the Gitea API **at request time** (edge-cached 5 min), so
publishing a release — `git tag v0.2.0 && git push origin v0.2.0`, which triggers
`.gitea/workflows/release.yml` — is the only release step. The site never needs a redeploy for
a new version, and empty/unreachable values fall back to the homepage instead of 404ing.
Light/dark follows the OS (`prefers-color-scheme`), no toggle, no JS required for it. Colors
come from the branding palette (teal = instrument, single amber point = finding).
`public/assets/` (favicon, wordmark, social preview) are **copies** of `../assets/branding/`
that directory is the source of truth; re-copy after any branding change.
## Deploy
Everything is driven by [wrangler](https://developers.cloudflare.com/workers/wrangler/), config
in `wrangler.jsonc`. No build step, no node_modules to commit.
### One-time setup
1. In the Cloudflare dashboard, add **echo-lot.app** as a zone (and point the domain's
nameservers at Cloudflare). The `routes` in `wrangler.jsonc` use `custom_domain: true`, so
wrangler creates the DNS records for `echo-lot.app` and `www` automatically on first deploy —
the zone just has to exist in the same account.
2. Auth, either flavor:
- **Interactive:** `npx wrangler login` (opens the browser once, stores an OAuth token).
- **API token (also what CI uses):** dashboard → My Profile → API Tokens → create from the
**"Edit Cloudflare Workers"** template. Then:
```
$env:CLOUDFLARE_API_TOKEN = "..." # PowerShell; export ... on POSIX
$env:CLOUDFLARE_ACCOUNT_ID = "..." # dashboard → Workers & Pages, right sidebar
```
### Deploy
```
cd web
npx wrangler@4 deploy
```
That's it — uploads `src/index.js` + the `public/` assets, wires the custom domains. Useful
extras: `npx wrangler dev` (local preview at localhost:8787), `npx wrangler tail` (live logs),
`npx wrangler versions list`.
### CI deploy (Gitea Actions)
`.gitea/workflows/deploy-site.yml` runs `wrangler deploy` on every push to `main`/`master` that
touches `web/`. It stays inert until you add two repo secrets (Settings → Actions → Secrets):
`CLOUDFLARE_API_TOKEN` and `CLOUDFLARE_ACCOUNT_ID` (same values as above).
Cloudflare's raw REST API (`PUT /accounts/:id/workers/scripts/...`) exists, but the assets
upload needs a manifest/session dance that wrangler already implements — use wrangler even in
automation.
## Config knobs (`wrangler.jsonc` → `vars`)
- `GITEA_REPO_API` — Gitea repo API base; releases must be publicly readable.
- `DOWNLOAD_URL` — manual `/apk` fallback while Gitea is unreachable.
- `FDROID_URL` — set when the F-Droid listing exists; until then `/fdroid` loops home.
- `SOURCE_URL` — public source mirror for the footer + `/source`.
Vars are plain (non-secret) config; change + `wrangler deploy` to apply.