Add compatibility mode.

app/src/main/java/eu/darken/capod/common/bluetooth/BleScanner.kt

@@ -31,8 +31,20 @@ class BleScanner @Inject constructor(
     @SuppressLint("MissingPermission") fun scan(
         filters: Set<ScanFilter>,
         scannerMode: ScannerMode,
+        compatMode: Boolean,
     ): Flow<List<BleScanResult>> = callbackFlow {
+        if (compatMode) log(TAG, WARN) { "Using compatibilityMode!" }
+
         val adapter = bluetoothManager.adapter
+
+        val supportsOffloadFiltering = adapter.isOffloadedFilteringSupported.also {
+            log(TAG, if (it) DEBUG else WARN) { "isOffloadedFilteringSupported=$it" }
+        } && !compatMode
+
+        val supportsOffloadBatching = adapter.isOffloadedScanBatchingSupported.also {
+            log(TAG, if (it) DEBUG else WARN) { "isOffloadedScanBatchingSupported=$it" }
+        } && !compatMode
+
         val scanner = bluetoothManager.scanner
 
         val callback = object : ScanCallback() {
@@ -43,7 +55,13 @@ class BleScanner @Inject constructor(
                     lastScanAt = System.currentTimeMillis()
                     "onScanResult(delay=${delay}ms, callbackType=$callbackType, result=$result)"
                 }
-                trySend(listOf(BleScanResult.fromScanResult(result)))
+                val toSend = if (supportsOffloadFiltering || filters.isEmpty() || filters.any { it.matches(result) }) {
+                    listOf(BleScanResult.fromScanResult(result))
+                } else {
+                    log(TAG, VERBOSE) { "Manual filtering: No match for $result" }
+                    emptyList()
+                }
+                trySend(toSend)
             }
 
             override fun onBatchScanResults(results: MutableList<ScanResult>) {
@@ -52,7 +70,19 @@ class BleScanner @Inject constructor(
                     lastScanAt = System.currentTimeMillis()
                     "onBatchScanResults(delay=${delay}ms, results=$results)"
                 }
-                trySend(results.map { BleScanResult.fromScanResult(it) })
+
+                val toSend = results
+                    .filter { result ->
+                        val passed = when {
+                            supportsOffloadFiltering -> true
+                            filters.isEmpty() -> true
+                            else -> filters.any { it.matches(result) }
+                        }
+                        if (!passed) log(TAG, VERBOSE) { "Manually filtered $result" }
+                        passed
+                    }
+                    .map { BleScanResult.fromScanResult(it) }
+                trySend(toSend)
             }
 
             override fun onScanFailed(errorCode: Int) {
@@ -60,6 +90,7 @@ class BleScanner @Inject constructor(
             }
         }
 
+
         val settings = ScanSettings.Builder().apply {
             setScanMode(
                 when (scannerMode) {
@@ -68,20 +99,24 @@ class BleScanner @Inject constructor(
                     ScannerMode.LOW_LATENCY -> ScanSettings.SCAN_MODE_LOW_LATENCY
                 }
             )
-            if (adapter.isOffloadedScanBatchingSupported) {
-                when (scannerMode) {
-                    ScannerMode.LOW_POWER -> setReportDelay(2000)
-                    ScannerMode.BALANCED -> setReportDelay(1000)
-                    ScannerMode.LOW_LATENCY -> setReportDelay(500)
-                }
-            } else {
-                log(TAG, WARN) { "isOffloadedScanBatchingSupported=false" }
+            if (supportsOffloadBatching) {
+                setReportDelay(
+                    when (scannerMode) {
+                        ScannerMode.LOW_POWER -> 2000L
+                        ScannerMode.BALANCED -> 1000L
+                        ScannerMode.LOW_LATENCY -> 500L
+                    }
+                )
             }
         }.build()
 
+        log(TAG, VERBOSE) { "Settings created for offloaded filtering: $settings" }
+
         val flushJob = launch {
+            log(TAG) { "Flush job launched" }
             while (isActive) {
                 // Can undercut the minimum setReportDelay(), e.g. 5000ms on a Pixel5@12
+                log(TAG, VERBOSE) { "Flushing scan results." }
                 adapter.bluetoothLeScanner.flushPendingScanResults(callback)
                 when (scannerMode) {
                     ScannerMode.LOW_POWER -> break
@@ -91,19 +126,17 @@ class BleScanner @Inject constructor(
             }
         }
 
-        if (adapter.isOffloadedFilteringSupported) {
-            scanner.startScan(filters.toList(), settings, callback)
-            log(TAG, VERBOSE) { "BleScanner started (filters=$filters, settings=$settings)" }
-        } else {
-            log(TAG, WARN) { "isOffloadedFilteringSupported=false" }
-            scanner.startScan(callback)
-            log(TAG, VERBOSE) { "BleScanner started" }
-        }
+        scanner.startScan(
+            if (supportsOffloadFiltering) filters.toList() else listOf(ScanFilter.Builder().build()),
+            settings,
+            callback
+        )
+        log(TAG) { "BleScanner started (filters=$filters, settings=$settings)" }
 
         awaitClose {
             flushJob.cancel()
             scanner.stopScan(callback)
-            log(TAG, INFO) { "BleScanner stopped" }
+            log(TAG) { "BleScanner stopped" }
         }
     }
         .map { fakeBleData.maybeAddfakeData(it) }

app/src/main/java/eu/darken/capod/main/core/GeneralSettings.kt

@@ -34,6 +34,11 @@ class GeneralSettings @Inject constructor(
         moshi
     )
 
+    val compatibilityMode = preferences.createFlowPreference(
+        "core.compatibility.enabled",
+        false
+    )
+
     val showAll = preferences.createFlowPreference(
         "core.showall.enabled",
         false
@@ -58,6 +63,7 @@ class GeneralSettings @Inject constructor(
     override val preferenceDataStore: PreferenceDataStore = PreferenceStoreMapper(
         monitorMode,
         scannerMode,
+        compatibilityMode,
         showAll,
         minimumSignalQuality,
         mainDeviceAddress,

app/src/main/java/eu/darken/capod/main/ui/overview/OverviewFragment.kt

@@ -10,6 +10,7 @@ import androidx.activity.result.ActivityResultLauncher
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.fragment.app.viewModels
 import dagger.hilt.android.AndroidEntryPoint
+import eu.darken.capod.BuildConfig
 import eu.darken.capod.R
 import eu.darken.capod.common.colorString
 import eu.darken.capod.common.debug.logging.log
@@ -71,6 +72,7 @@ class OverviewFragment : Fragment3(R.layout.main_fragment) {
         }
 
         vm.listItems.observe2(ui) {
+            if (BuildConfig.DEBUG) toolbar.subtitle = "${it.size} items"
             adapter.update(it)
         }
 

app/src/main/java/eu/darken/capod/monitor/core/PodMonitor.kt

@@ -61,19 +61,22 @@ class PodMonitor @Inject constructor(
                 log(TAG) { "Bluetooth is enabled" }
                 combine(
                     generalSettings.scannerMode.flow,
+                    generalSettings.compatibilityMode.flow,
                     debugSettings.showUnfiltered.flow
-                ) { mode, unfiltered -> mode to unfiltered }
-                    .flatMapLatest { (mode, unfiltered) ->
-                        val filters = if (unfiltered) {
-                            setOf(getUnfilteredFilter())
-                        } else {
-                            ProximityPairing.getBleScanFilter()
-                        }
-                        bleScanner.scan(
-                            filters = filters,
-                            scannerMode = mode
-                        ).map { it.preFilterAndMap(mode) }
+                ) { scannerMode, compatMode, unfiltered ->
+                    Triple(scannerMode, compatMode, unfiltered)
+                }.flatMapLatest { (mode, compat, unfiltered) ->
+                    val filters = if (unfiltered) {
+                        setOf(getUnfilteredFilter())
+                    } else {
+                        ProximityPairing.getBleScanFilter()
                     }
+                    bleScanner.scan(
+                        filters = filters,
+                        scannerMode = mode,
+                        compatMode = compat,
+                    ).map { it.preFilterAndMap(mode) }
+                }
             } else {
                 log(TAG, WARN) { "Bluetooth is currently disabled" }
                 flowOf(null)

app/src/main/res/drawable/ic_baseline_ghost_24.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="?attr/colorControlNormal"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M12,2A9,9 0 0,0 3,11V22L6,19L9,22L12,19L15,22L18,19L21,22V11A9,9 0 0,0 12,2M9,8A2,2 0 0,1 11,10A2,2 0 0,1 9,12A2,2 0 0,1 7,10A2,2 0 0,1 9,8M15,8A2,2 0 0,1 17,10A2,2 0 0,1 15,12A2,2 0 0,1 13,10A2,2 0 0,1 15,8Z" />
+</vector>

app/src/main/res/values/strings.xml

@@ -142,4 +142,6 @@
     <string name="settings_blescanner_unfiltered_label">Unfiltered BLE data</string>
     <string name="settings_blescanner_unfiltered_description">Remove any filters from the BLE scanner to show all broadcasted BLE data. Useful to add support for new headphone types.</string>
     <string name="permission_required_title">The following permission is required:</string>
+    <string name="settings_compatibility_mode_label">Compatibility mode</string>
+    <string name="settings_compatibility_mode_description">Disable optimizations to improve compatibility. Try this if you are not seeing any data.</string>
 </resources>

app/src/main/res/xml/preferences_general.xml

@@ -14,6 +14,12 @@
         android:summary="@string/settings_scanner_mode_description"
         android:title="@string/settings_scanner_mode_label" />
 
+    <CheckBoxPreference
+        android:icon="@drawable/ic_baseline_ghost_24"
+        android:key="core.compatibility.enabled"
+        android:summary="@string/settings_compatibility_mode_description"
+        android:title="@string/settings_compatibility_mode_label" />
+
     <CheckBoxPreference
         android:icon="@drawable/ic_baseline_devices_other_24"
         android:key="core.showall.enabled"