mrambossekandClaude Opus 5
f6e093944c
An entire module was missing from the APK. The app died with ClassNotFoundException for app.echo_lot.protocol.EnrollmentLink while the build was green, the module's jar was correct, and :app:dependencies listed it on debugRuntimeClasspath — its code simply never reached AGP's intermediates. The cause was a poisoned Gradle build cache entry, which is why nothing obvious fixed it: clean, rm -rf */build and --rerun-tasks all leave the build cache alone. Only --no-build-cache did. Every app build made in this session shipped without core-protocol, so enrolment, sign-in and upload would all have crashed identically; several hours of "the tap does nothing" were this, misread as a UI problem. CLAUDE.md now carries the symptom, the fix, and the verification — grepping the dex for a string literal only that module defines, because grepping for a class *name* proves nothing: callers carry the name as a reference whether or not the class is packaged. That false check is what let me believe an earlier rebuild had fixed it. Also: the enrolment dialog compared the stored endpoint against the link's public URL, so re-enrolling with the same server announced itself as a move to a different one. Those are deliberately different strings now that discovery exists; the comparison uses the public name on both sides. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Echolot
Free software for detecting and debugging local network issues from an Android phone — built for people who actually know what a neighbor table is.
Most "wifi analyzer" apps show you signal bars. Echolot aims at the layer where home and office networks actually break: duplicate DHCP servers, broken IPv6 RAs, MTU black holes, NAT64 weirdness, multicast that dies at the AP, DNS that answers differently than it should. It records what it observed, separates observation from interpretation, and exports the whole run so you can argue with it later.
Status: pre-release. The capability prober runs on real hardware; the production app and the probe server are not built yet.
Repository layout
docs/ design docs — the contract for everything below
echolot-prober/ capability prober: validates the no-root feasibility matrix on real devices
The Go probe server and the production app land here as siblings.
Design docs
The three specs are draft-complete and reviewed; treat them as the contract.
| Doc | What it defines |
|---|---|
| docs/feature-catalog-and-feasibility.md | Full feature list + the no-root feasibility matrix |
| docs/measurement-schema.md | Archived/exportable measurement JSON (observation vs finding, two-clock rule, anonymization) |
| docs/probe-protocol.md | Client↔server wire protocol (pinned TLS control plane, binary UDP data plane, STUN, canary DNS) |
| docs/build-status.md | Running log of decisions and next steps |
Privilege tiers
Every result records which tier produced it:
app— no root, no special setup. The bulk of the functionality.shizuku— ADB-shell privileges via wireless pairing, no root. Shipped in v1.root— future optional module.
Licensing
| Part | License | Why |
|---|---|---|
| All code (app, prober, server) | GPL-3.0-or-later | The value here is the platform-API research; copyleft keeps derivative apps free |
docs/ (the specs) |
CC-BY-4.0 | A wire protocol and a measurement format should be implementable by anyone, without license anxiety |
Full texts: LICENSE (GPLv3) and docs/LICENSE (CC BY 4.0).
Sources carry SPDX-License-Identifier headers.
If you want to build a compatible server or client, the protocol and schema docs are deliberately permissive — go ahead.
Building
See echolot-prober/README.md. Short version, from echolot-prober/:
echo "sdk.dir=/path/to/Android/sdk" > local.properties
./gradlew :app:assembleDebug