mrambossekandClaude Opus 5
d9ee8bc2ae
The per-network attribution fix worked — the finding named rmnet_data1 instead of the IPv4-only wifi — and immediately exposed a worse problem underneath. Cellular's result was `ok: false` because binding a socket to it failed with EPERM, so no echo request was ever sent; the finding then reported "IPv6 is configured, but ICMPv6 gets no reply" about a network the app had never pinged. That is an assertion about the user's carrier with nothing behind it. `attempted` now travels beside `ok`, set only once sendto has returned, and the finding requires both. Failing to bind is a fact about this app's permissions on this device; it says nothing about the network, and the two must not share a boolean. Verified on hardware with a VPN active: every network fails to bind with EPERM, nothing is sent, and no ICMPv6 finding is emitted — where the previous build would have blamed the carrier. Recorded in build-status: Android blocks per-network binding entirely while a VPN holds the default route, so per-network measurement is unavailable to anyone with one connected. That needs a deliberate answer rather than a silently green run. 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