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Join a nearby host through btleplug's Bluetooth central on Android (R76 slice 6) - #141
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📝 Walkthrough
Merge Risk: 🔵 Low · up to The change looks mergeable. Three minor earlier concerns remain open: a possible lost Bluetooth notification, a Bluetooth prompt that could stay unresolved after the Activity is recreated, and unused default dependency features. Review these before or soon after merging. Caution Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional.
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## feat/r76-bluetooth #141 +/- ##
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+ Coverage 74.15% 86.50% +12.34%
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Files 178 179 +1
Lines 42502 46257 +3755
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+ Hits 31518 40015 +8497
+ Misses 9219 4256 -4963
- Partials 1765 1986 +221
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Actionable comments posted: 6
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at
@crates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/stream/QueueStream.java:
- Around line 30-31: Update QueueStream.pollNext to remove the item from
this.result while this.lock is held, then have the deferred PollResult return
the captured item instead of accessing the queue later.
Review comments at
@crates/connetto-peer-android/android/src/main/kotlin/dev/connetto/peer/BluetoothPlugin.kt:
- Around line 152-180: Update askPermissions and askEnable so a prompt already
in flight cannot be replaced by a second registration under the same key. When
promptOutcome is OUTCOME_IN_FLIGHT but its launcher is no longer registered,
recover the outcome from the current permission and adapter state so every
started prompt reaches a final result.
Review comments at
@crates/connetto-test-harness/src/bin/connetto-android-proof.rs:
- Around line 503-509: Update the Beacon cleanup around run_peer_proof so both
phones are checked and left with Bluetooth off even when the proof fails.
Replace the ignored adb disable results with error propagation into the returned
Result, following the restore_role and restore_stay pattern, and ensure cleanup
runs before returning a proof error.
- Around line 687-697: Update the JoinBy::Beacon flow after wait_for_text to
verify that exactly one nearby host is present and that it matches the beacon
read by read_beacon, before clicking to join. Do not rely on PeerPanel’s
RSSI-only selection when multiple nearby entries are available.
Review comments at @examples/dioxus-desktop-demo/src/main.rs:
- Around line 1004-1008: Update the strongest-host selection in the nearby_hosts
iterator to break equal RSSI values deterministically using the host identifier
as a secondary key; retain the existing treatment of missing RSSI.
- Around line 1002-1026: Update the nearby-host button handler to prevent
starting another `join_nearby` call while one is in flight. Track an in-flight
flag, set it before spawning the task, and clear it when the attempt completes
so concurrent clicks cannot overwrite the active attempt’s outcome.
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Cargo.lockis excluded by!**/*.lockexamples/dioxus-desktop-demo/Cargo.lockis excluded by!**/*.lock
📒 Files selected for processing (44)
crates/connetto-client/Cargo.tomlcrates/connetto-client/src/bluetooth.rscrates/connetto-client/src/bluetooth/android.rscrates/connetto-client/src/bluetooth/central.rscrates/connetto-client/src/builder/native.rscrates/connetto-peer-android/Cargo.tomlcrates/connetto-peer-android/README.mdcrates/connetto-peer-android/android/btleplug-LICENSE.mdcrates/connetto-peer-android/android/build.gradle.ktscrates/connetto-peer-android/android/consumer-rules.procrates/connetto-peer-android/android/src/main/java/com/nonpolynomial/btleplug/android/impl/Adapter.javacrates/connetto-peer-android/android/src/main/java/com/nonpolynomial/btleplug/android/impl/BluetoothException.javacrates/connetto-peer-android/android/src/main/java/com/nonpolynomial/btleplug/android/impl/NoBluetoothAdapterException.javacrates/connetto-peer-android/android/src/main/java/com/nonpolynomial/btleplug/android/impl/NoSuchCharacteristicException.javacrates/connetto-peer-android/android/src/main/java/com/nonpolynomial/btleplug/android/impl/NotConnectedException.javacrates/connetto-peer-android/android/src/main/java/com/nonpolynomial/btleplug/android/impl/Peripheral.javacrates/connetto-peer-android/android/src/main/java/com/nonpolynomial/btleplug/android/impl/PermissionDeniedException.javacrates/connetto-peer-android/android/src/main/java/com/nonpolynomial/btleplug/android/impl/ScanFilter.javacrates/connetto-peer-android/android/src/main/java/com/nonpolynomial/btleplug/android/impl/UnexpectedCallbackException.javacrates/connetto-peer-android/android/src/main/java/com/nonpolynomial/btleplug/android/impl/UnexpectedCharacteristicException.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/future/Future.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/future/FutureException.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/future/SimpleFuture.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/ops/FnAdapter.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/ops/FnBiFunction.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/ops/FnBiFunctionImpl.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/ops/FnFunction.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/ops/FnFunctionImpl.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/ops/FnRunnable.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/ops/FnRunnableImpl.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/panic/PanicException.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/stream/QueueStream.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/stream/Stream.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/stream/StreamPoll.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/task/PollResult.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/task/Waker.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/thread/LocalThreadChecker.javacrates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/thread/LocalThreadException.javacrates/connetto-peer-android/android/src/main/kotlin/dev/connetto/peer/BluetoothPlugin.ktcrates/connetto-peer-android/src/android.rscrates/connetto-peer-android/src/lib.rscrates/connetto-test-harness/src/bin/connetto-android-proof.rsexamples/dioxus-desktop-demo/src/main.rsplans/master-implementation-plan.md
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| if (!this.result.isEmpty()) { | ||
| result = () -> () -> this.result.remove(); |
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🩺 Stability & Availability | 🟡 Minor | ⚡ Quick win
Remove the queue item while the lock is held.
Rule broken: all access to this.result must happen under this.lock.
At Line 31, this.result.remove() does not run inside pollNext. It runs later, when Rust calls PollResult.get().get(), and the lock is released by then. Peripheral.Callback.onCharacteristicChanged calls add from the Binder thread at the same time. LinkedList is not thread-safe, so a notification can be lost or the list can be corrupted. Notifications carry the ordered exchange stream, so one lost notification breaks that exchange.
Proposed fix
--- "a/crates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/stream/QueueStream.java"
+++ "b/crates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/stream/QueueStream.java"
@@ -27,8 +27,9 @@
PollResult<StreamPoll<T>> result = null;
Waker oldWaker = null;
synchronized (this.lock) {
if (!this.result.isEmpty()) {
- result = () -> () -> this.result.remove();
+ T item = this.result.remove();
+ result = () -> () -> item;
} else if (this.finished) {
result = () -> null;
} else {📝 Committable suggestion
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Suggested change
| if (!this.result.isEmpty()) { | |
| result = () -> () -> this.result.remove(); | |
| if (!this.result.isEmpty()) { | |
| T item = this.result.remove(); | |
| result = () -> () -> item; |
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🪛 GitHub Check: SonarCloud Code Analysis
[warning] 31-31: Replace this lambda with method reference 'this.result::remove'. (sonar.java.source not set. Assuming 8 or greater.)
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Review comment at
@crates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/stream/QueueStream.java
around lines 30 - 31:
Update QueueStream.pollNext to remove the item from this.result while this.lock
is held, then have the deferred PollResult return the captured item instead of
accessing the queue later.
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Valid, and the defect is in btleplug's droidplug Java, which this crate vendors unchanged from the pinned fork. pollNext returns () -> () -> this.result.remove(), so the removal runs after the lock is released while the Binder thread's add can change the same LinkedList. Nothing upstream reports it: deviceplug/btleplug#480 covers a different race in this file, and deviceplug/jni-utils-rs#3 only moved add under the lock. The fix is going to btleplug with exactly the change you propose, and this copy takes it with the next pin, so the vendored Java keeps matching upstream.
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@LucaCappelletti94 Thanks for the guidance. Taking the fix through btleplug preserves the upstream match. The finding remains open until the pin update includes the fix.
Would you like a follow-up issue to track the upstream fix and pin update?
✏️ Learnings added
Learnt from: LucaCappelletti94
Repo: LucaCappelletti94/connetto-rs PR: 141
File: crates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/stream/QueueStream.java:30-31
Timestamp: 2026-10-09T12:52:43.656Z
Learning: In connetto-rs, crates/connetto-peer-android/android/src/main/java/com/nonpolynomial/btleplug/ and crates/connetto-peer-android/android/src/main/java/io/github/gedgygedgy/rust/ contain Java code vendored unchanged from the pinned btleplug fork. Fixes to this vendored Java should go upstream to btleplug and enter this repository through a pin update, so the vendored code continues to match upstream.
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @crates/connetto-client/Cargo.toml:
- Line 261: Update the btleplug dependency declaration to disable default
features and enable only the features required by the client’s central
functionality, preserving its optional status; ensure the configuration builds
for Android and desktop targets.
After applying the fix, consider running `coderabbit review --agent` for local
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| ipnet = "2.12" | ||
| # The joiner's Bluetooth central (R76 decision 22), from the release whose | ||
| # Android init resolves its classes through the context class loader. | ||
| btleplug = { version = "0.13.5", optional = true } |
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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win
btleplug keeps its default features.
Line 261 declares btleplug without default-features = false. The retrieved learning requires explicit feature control unless every default feature is genuinely required. Set default-features = false and enable only the features the central uses. Verify that the build still passes on Android and on the desktop targets.
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Review comment at @crates/connetto-client/Cargo.toml at line 261:
Update the btleplug dependency declaration to disable default features and
enable only the features required by the client’s central functionality,
preserving its optional status; ensure the configuration builds for Android and
desktop targets.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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An Android device now finds a nearby host's Bluetooth beacon, fetches the hotspot over the identity-proven exchange from #140, and joins it, so two phones link with one tap on the joiner and the system's approval. The joiner's central is btleplug, pinned to the fork carrying deviceplug/btleplug#495 until a release includes it. The demo lists the hosts it sees and gains a button that joins the strongest.
Decision 22 in the plan places the work.
connetto-clientimplements the central over btleplug on a thread of its own, so iOS, macOS, Windows and Linux can run the same code later without changes.connetto-peer-androidonly bridges Android's virtual machine to the jni version btleplug links, with the oneunsafecall that bridge needs under the crate's own lints, and bundles btleplug's Java under its licence with R8 keep rules. A device whose central does not start neither scans nor joins.Two Galaxy A35s on emi ran the whole path. The Android 14 phone saw the Android 15 phone's beacon on its panel, joined through the exchange, and both phones named each other linked before leaving and stopping the hotspot. That first real connection found three bugs in the host half and two Android-only clippy errors in the hotspot backend, now fixed on #140 and #137, which this branch is rebased on.
Android clients could not discover nearby hosts over Bluetooth or join through the Bluetooth exchange. The client lacked a Bluetooth central, and the Android integration lacked the JVM support required by
btleplug.The client starts the central when Bluetooth is ready, on a dedicated thread, and Android bridges it to the JVM. The joiner can then discover nearby hosts and join through the existing identity proven exchange. The demo and Android proof flow support nearby host selection and joining.