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Advertise a Bluetooth beacon and hand over the hotspot after an identity-proven exchange (R76 slice 5a) - #140
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📝 WalkthroughWalkthroughThe pull request adds Bluetooth beacon encoding and authenticated hotspot-offer exchange to the peer crate. It adds Android Bluetooth peripheral and JNI support, integrates Bluetooth state and operations into the client, and extends the Android proof harness and desktop demo. ChangesPeer Bluetooth exchange
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant BluetoothPlugin
participant AndroidBluetoothBackend
participant BluetoothMachine
participant PeerNode
BluetoothPlugin->>AndroidBluetoothBackend: Return polled connection and chunk events
AndroidBluetoothBackend->>BluetoothMachine: Forward decoded peripheral events
BluetoothMachine->>PeerNode: Run authenticated offer exchange
PeerNode-->>BluetoothMachine: Return peer identity and offer
BluetoothMachine->>AndroidBluetoothBackend: Send outbound chunks
AndroidBluetoothBackend->>BluetoothPlugin: Notify connected device
Merge Risk: 🟡 Moderate · up to If Bluetooth is off, joining or fetching a nearby hotspot can report a timeout while the prompt and exchange are still running. The Bluetooth exchange can also end early when a nearby device sends an empty write. It can stall when an Android notification fails. Fix these before merge. Caution Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional.
❌ Failed checks (1 error, 3 warnings)
✅ Passed checks (8 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 68.59% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 191 functions across 23 files. (4 skipped: 4 unsupported.) Full details: Git Dependency Pin Stays Out Of CommitsExplanation Cargo.lock is modified by the PR, and repository manifests declare unpinned git dependencies without ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## feat/r76-android-hotspot #140 +/- ##
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- Coverage 86.66% 77.92% -8.74%
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Files 174 158 -16
Lines 43201 39353 -3848
Branches 43201 39353 -3848
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- Hits 37440 30667 -6773
- Misses 3837 7107 +3270
+ Partials 1924 1579 -345
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…ity-proven exchange (R76 slice 5a)
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…t for the Bluetooth ones beside them
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Actionable comments posted: 5
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @crates/connetto-client/Cargo.toml:
- Around line 333-335: Update the diesel-sqlite-session dependency declaration
in the Cargo.toml manifest to pin its git source with an explicit revision or
tag, preserving the repository’s lockfile invariant.
Review comments at @crates/connetto-client/src/enrolment/task.rs:
- Around line 526-554: Update the timeout durations in join_nearby and
fetch_offer to include PROMPT_BOUND before their existing bounds, so each caller
waits long enough for the Bluetooth prompt and the subsequent exchange to
complete.
Review comments at
@crates/connetto-peer-android/android/src/main/kotlin/dev/connetto/peer/BluetoothPlugin.kt:
- Around line 441-458: Update the notification failure paths in the
`onNotificationSent` handling: when the callback reports failure or the queued
retry via `notifyCharacteristicChanged` fails, cancel the connection and emit
the `$EVENT_DISCONNECTED\t$key` event. Do not clear or advance the queue and
continue sending later chunks after either failure.
Review comments at @crates/connetto-peer/src/exchange.rs:
- Around line 87-94: Update the inbound-chunk handling in poll_read to skip
empty chunks rather than treating them as EOF. Continue polling while pending is
empty, return EOF only when inbound.poll_recv returns Poll::Ready(None), and
preserve the existing behavior for non-empty chunks and Poll::Pending.
Review comments at @crates/connetto-peer/src/tests.rs:
- Around line 2524-2526: Update the test comment to describe only the asserted
successful link and issuer matching by key rather than DN; remove the obsolete
failure description and avoid punctuation disallowed by the comment style rules.
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📒 Files selected for processing (28)
crates/connetto-client/Cargo.tomlcrates/connetto-client/src/bluetooth.rscrates/connetto-client/src/bluetooth/android.rscrates/connetto-client/src/builder/native.rscrates/connetto-client/src/enrolment/task.rscrates/connetto-client/src/enrolment/tests.rscrates/connetto-client/src/hotspot.rscrates/connetto-client/src/hotspot/android.rscrates/connetto-client/src/lib.rscrates/connetto-client/tests/it/enrolment.rscrates/connetto-peer-android/android/src/main/AndroidManifest.xmlcrates/connetto-peer-android/android/src/main/kotlin/dev/connetto/peer/BluetoothPlugin.ktcrates/connetto-peer-android/android/src/main/kotlin/dev/connetto/peer/HotspotPlugin.ktcrates/connetto-peer-android/src/android.rscrates/connetto-peer/Cargo.tomlcrates/connetto-peer/src/beacon.rscrates/connetto-peer/src/error.rscrates/connetto-peer/src/exchange.rscrates/connetto-peer/src/exchange_proofs.rscrates/connetto-peer/src/fingerprint.rscrates/connetto-peer/src/frame.rscrates/connetto-peer/src/lib.rscrates/connetto-peer/src/link.rscrates/connetto-peer/src/node.rscrates/connetto-peer/src/tests.rscrates/connetto-test-harness/src/bin/connetto-android-proof.rsexamples/dioxus-desktop-demo/src/main.rsplans/master-implementation-plan.md
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LucaCappelletti94
added this pull request to stack #144
October 9, 2026 13:26
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A device that hosts a hotspot and serves its peer link now advertises a small Bluetooth beacon, and a nearby device can fetch the hotspot's password over Bluetooth once both have proven their identities with the same mutual TLS the Wi-Fi link uses. This is the host half of R76's Bluetooth path, stacked on #137. The joining half on Android needs a Bluetooth central, which arrives in the next slice over btleplug once deviceplug/btleplug#495 lands or through a pin on the fork. Until then a system without a central neither scans nor joins, and
join_nearbyanswersUnsupported.The plan gains decisions 18 to 21 and the full state tables for the beacon and the joiner. The beacon is a legacy advertisement every platform can see, carrying the first 8 bytes of the certificate fingerprint. Scanning runs in the background by default and joining on its own is off unless the application turns it on. Every backend reports one Bluetooth readiness, and the system prompt to turn Bluetooth on only ever runs inside a call the user triggered.
host_hotspotnow answers the offer together with the beacon's status, so the offer still reaches the application when Bluetooth is off.The exchange and both state machines are proven in memory against real nodes, and on a Galaxy A35 the demo's beacon showed on its panel while the phone's Bluetooth dump listed the demo's legacy connectable advertisement and its GATT service. Android offers no way to scan from
adbwithout an application, so the other phone sighting the beacon waits for the central. Twoconnetto-peertests need the issuer name fix in #139 and pass once the stack is rebased on it.Devices could host a hotspot, but nearby peers had no Bluetooth path to discover the host and obtain its offer. The new exchange sends the hotspot details only after both peers authenticate with device certificates over mutual TLS, preserving the identity checks used by the Wi-Fi link.
The host advertises an eight-byte certificate fingerprint prefix and reports beacon status separately from hotspot availability, so hosting can continue if Bluetooth is unavailable. Android supports advertising and GATT exchange. Joining remains unsupported on systems without a Bluetooth central, and applications must enable joining.