Implement profile-based device separation in overview UI

- Add UnmatchedDevicesCard to show/hide devices without profiles
- Separate devices with profiles from unmatched devices in overview
- Add priority-based sorting (profile.priority with 0 = highest)
- Add compiler args for experimental unsigned types and annotation targets
- Add string resources for unmatched devices UI
- Refactor overview to handle both profiled and non-profiled devices

The UI now shows:
1. Devices with configured profiles first (sorted by priority)
2. Collapsible section for unmatched devices with toggle button
3. Session-persistent show/hide state for unmatched devices

app/build.gradle.kts

@@ -114,7 +114,9 @@ android {
             "-opt-in=kotlinx.coroutines.ExperimentalCoroutinesApi",
             "-opt-in=kotlinx.coroutines.FlowPreview",
             "-opt-in=kotlin.time.ExperimentalTime",
-            "-opt-in=kotlin.RequiresOptIn"
+            "-opt-in=kotlin.RequiresOptIn",
+            "-opt-in=kotlin.ExperimentalUnsignedTypes",
+            "-Xannotation-default-target=param-property"
         )
     }
 

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

@@ -0,0 +1,2 @@
+package eu.darken.capod.common.bluetooth
+

app/src/main/java/eu/darken/capod/common/serialization/NameBasedPolyJsonAdapterFactory.kt

@@ -0,0 +1,110 @@
+@file:Suppress("MemberVisibilityCanBePrivate")
+
+package eu.darken.sdmse.common.serialization
+
+import com.squareup.moshi.*
+import java.lang.reflect.Type
+import java.util.*
+import javax.annotation.CheckReturnValue
+
+class NameBasedPolyJsonAdapterFactory<T> internal constructor(
+    val baseType: Class<T>,
+    val keyLabels: List<String> = emptyList(),
+    val subtypes: List<Type> = emptyList(),
+) : JsonAdapter.Factory {
+
+    fun withSubtype(subtype: Class<out T>, label: String): NameBasedPolyJsonAdapterFactory<T> {
+        require(!keyLabels.contains(label)) { "Labels must be unique." }
+        return NameBasedPolyJsonAdapterFactory(
+            baseType = baseType,
+            keyLabels = keyLabels + label,
+            subtypes = subtypes + subtype,
+        )
+    }
+
+    override fun create(type: Type, annotations: Set<Annotation>, moshi: Moshi): JsonAdapter<*>? {
+        if (Types.getRawType(type) != baseType || annotations.isNotEmpty()) {
+            return null
+        }
+
+        val jsonAdapters = ArrayList<JsonAdapter<Any>>(subtypes.size)
+        var i = 0
+        val size = subtypes.size
+        while (i < size) {
+            jsonAdapters.add(moshi.adapter(subtypes[i]))
+            i++
+        }
+
+        return PolymorphicJsonAdapter(
+            nameLabels = keyLabels,
+            subTypes = subtypes,
+            jsonAdapters = jsonAdapters,
+        ).nullSafe()
+    }
+
+    internal class PolymorphicJsonAdapter(
+        val nameLabels: List<String>,
+        val subTypes: List<Type>,
+        val jsonAdapters: List<JsonAdapter<Any>>,
+    ) : JsonAdapter<Any>() {
+
+        private val nameOptions: JsonReader.Options = JsonReader.Options.of(*nameLabels.toTypedArray())
+
+        override fun fromJson(reader: JsonReader): Any? {
+            val peeked = reader.peekJson().apply {
+                setFailOnUnknown(false)
+            }
+            val labelIndex = peeked.use(::labelIndex)
+
+            if (labelIndex == -1) {
+                throw JsonDataException("No matching Field names for $nameLabels")
+            }
+
+            return jsonAdapters[labelIndex].fromJson(reader)
+
+        }
+
+        private fun labelIndex(reader: JsonReader): Int {
+            reader.beginObject()
+            while (reader.hasNext()) {
+                val labelIndex = reader.selectName(nameOptions)
+                if (labelIndex == -1) {
+                    reader.skipName()
+                    reader.skipValue()
+                    continue
+                }
+                return labelIndex
+            }
+
+            return -1
+//            throw JsonDataException("Missing label for $labelKey")
+        }
+
+        override fun toJson(writer: JsonWriter, value: Any?) {
+            val type = value!!.javaClass
+            val typeIndex = subTypes.indexOf(type)
+
+            if (typeIndex == -1) {
+                throw JsonDataException("No matching name label for $value. Valid labels are $nameLabels")
+            }
+
+            val adapter = jsonAdapters[typeIndex]
+
+            writer.beginObject()
+            val flattenToken = writer.beginFlatten()
+            adapter.toJson(writer, value)
+            writer.endFlatten(flattenToken)
+            writer.endObject()
+        }
+
+        override fun toString(): String = "KeyBasedPolyJsonAdapterFactory($nameLabels)"
+    }
+
+    companion object {
+
+        @CheckReturnValue
+        fun <T> of(baseType: Class<T>): NameBasedPolyJsonAdapterFactory<T> = NameBasedPolyJsonAdapterFactory(
+            baseType
+        )
+    }
+}

app/src/main/java/eu/darken/capod/devices/core/AppleDeviceProfile.kt

@@ -0,0 +1,3 @@
+package eu.darken.capod.devices.core
+
+data class AppleDeviceProfile()

app/src/main/java/eu/darken/capod/devices/core/DeviceProfileId.kt

@@ -0,0 +1,2 @@
+package eu.darken.capod.devices.core
+

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

@@ -12,8 +12,9 @@ import eu.darken.capod.common.lists.modular.ModularAdapter
 import eu.darken.capod.common.lists.modular.mods.DataBinderMod
 import eu.darken.capod.common.lists.modular.mods.TypedVHCreatorMod
 import eu.darken.capod.main.ui.overview.cards.BluetoothDisabledVH
-import eu.darken.capod.main.ui.overview.cards.MissingMainDeviceVH
+import eu.darken.capod.main.ui.overview.cards.NoProfilesVH
 import eu.darken.capod.main.ui.overview.cards.PermissionCardVH
+import eu.darken.capod.main.ui.overview.cards.UnmatchedDevicesCardVH
 import eu.darken.capod.main.ui.overview.cards.pods.DualPodsCardVH
 import eu.darken.capod.main.ui.overview.cards.pods.SinglePodsCardVH
 import eu.darken.capod.main.ui.overview.cards.pods.UnknownPodDeviceCardVH
@@ -30,8 +31,9 @@ class OverviewAdapter @Inject constructor() :
         modules.add(TypedVHCreatorMod({ data[it] is PermissionCardVH.Item }) { PermissionCardVH(it) })
         modules.add(TypedVHCreatorMod({ data[it] is DualPodsCardVH.Item }) { DualPodsCardVH(it) })
         modules.add(TypedVHCreatorMod({ data[it] is SinglePodsCardVH.Item }) { SinglePodsCardVH(it) })
-        modules.add(TypedVHCreatorMod({ data[it] is MissingMainDeviceVH.Item }) { MissingMainDeviceVH(it) })
+        modules.add(TypedVHCreatorMod({ data[it] is NoProfilesVH.Item }) { NoProfilesVH(it) })
         modules.add(TypedVHCreatorMod({ data[it] is BluetoothDisabledVH.Item }) { BluetoothDisabledVH(it) })
+        modules.add(TypedVHCreatorMod({ data[it] is UnmatchedDevicesCardVH.Item }) { UnmatchedDevicesCardVH(it) })
         modules.add(TypedVHCreatorMod({ data[it] is UnknownPodDeviceCardVH.Item }) { UnknownPodDeviceCardVH(it) })
     }
 

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

@@ -8,18 +8,21 @@ import eu.darken.capod.common.bluetooth.BluetoothManager2
 import eu.darken.capod.common.coroutine.DispatcherProvider
 import eu.darken.capod.common.debug.DebugSettings
 import eu.darken.capod.common.debug.logging.log
+import eu.darken.capod.common.debug.logging.logTag
 import eu.darken.capod.common.flow.combine
 import eu.darken.capod.common.flow.throttleLatest
 import eu.darken.capod.common.livedata.SingleLiveEvent
 import eu.darken.capod.common.permissions.Permission
 import eu.darken.capod.common.uix.ViewModel3
 import eu.darken.capod.common.upgrade.UpgradeRepo
+import eu.darken.capod.devices.core.DeviceProfilesRepo
 import eu.darken.capod.main.core.GeneralSettings
 import eu.darken.capod.main.core.MonitorMode
 import eu.darken.capod.main.core.PermissionTool
 import eu.darken.capod.main.ui.overview.cards.BluetoothDisabledVH
-import eu.darken.capod.main.ui.overview.cards.MissingMainDeviceVH
+import eu.darken.capod.main.ui.overview.cards.NoProfilesVH
 import eu.darken.capod.main.ui.overview.cards.PermissionCardVH
+import eu.darken.capod.main.ui.overview.cards.UnmatchedDevicesCardVH
 import eu.darken.capod.main.ui.overview.cards.pods.DualPodsCardVH
 import eu.darken.capod.main.ui.overview.cards.pods.SinglePodsCardVH
 import eu.darken.capod.main.ui.overview.cards.pods.UnknownPodDeviceCardVH
@@ -38,8 +41,10 @@ import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.isActive
+import java.time.Duration
 import java.time.Instant
 import javax.inject.Inject
+import kotlin.collections.sortedWith
 
 @HiltViewModel
 class OverviewFragmentVM @Inject constructor(
@@ -52,6 +57,7 @@ class OverviewFragmentVM @Inject constructor(
     debugSettings: DebugSettings,
     private val upgradeRepo: UpgradeRepo,
     private val bluetoothManager: BluetoothManager2,
+    private val profilesRepo: DeviceProfilesRepo,
 ) : ViewModel3(dispatcherProvider = dispatcherProvider) {
 
     init {
@@ -98,6 +104,8 @@ class OverviewFragmentVM @Inject constructor(
 
     val requestPermissionEvent = SingleLiveEvent<Permission>()
 
+    private var showUnmatchedDevices = false
+
     private val pods: Flow<List<PodDevice>> = permissionTool.missingPermissions
         .flatMapLatest { permissions ->
             if (permissions.isNotEmpty()) {
@@ -115,8 +123,8 @@ class OverviewFragmentVM @Inject constructor(
         pods,
         debugSettings.isDebugModeEnabled.flow,
         bluetoothManager.isBluetoothEnabled,
-        podMonitor.mainDevice,
-    ) { _, permissions, pods, isDebugMode, isBluetoothEnabled, mainPod ->
+        profilesRepo.profiles,
+    ) { _, permissions, devices, isDebugMode, isBluetoothEnabled, profiles ->
         val items = mutableListOf<OverviewAdapter.Item>()
 
         permissions
@@ -131,42 +139,79 @@ class OverviewFragmentVM @Inject constructor(
         if (permissions.isEmpty()) {
             if (!isBluetoothEnabled) {
                 items.add(0, BluetoothDisabledVH.Item)
-            } else if (mainPod == null) {
-                items.add(0, MissingMainDeviceVH.Item(
-                    onManageDevices = {
-                        OverviewFragmentDirections.actionOverviewFragmentToDeviceManagerFragment().navigate()
-                    }
-                ))
+            } else if (profiles.isEmpty()) {
+                items.add(
+                    0, NoProfilesVH.Item(
+                        onManageDevices = {
+                            OverviewFragmentDirections.actionOverviewFragmentToDeviceManagerFragment().navigate()
+                        }
+                    ))
             }
         }
 
         if (permissions.isEmpty() && isBluetoothEnabled) {
-            pods.map {
-                val now = Instant.now()
-                val isMainPod = it.identifier == mainPod?.identifier
-                when (it) {
+            val now = Instant.now()
+            
+            // Split devices into profiled and unmatched
+            val profiledDevices = devices.filter { it.meta.profile != null }
+            val unmatchedDevices = devices.filter { it.meta.profile == null }
+            
+            // Add profiled devices first
+            profiledDevices.map { device ->
+                when (device) {
                     is DualPodDevice -> DualPodsCardVH.Item(
                         now = now,
-                        device = it,
+                        device = device,
                         showDebug = isDebugMode,
-                        isMainPod = isMainPod,
                     )
 
                     is SinglePodDevice -> SinglePodsCardVH.Item(
                         now = now,
-                        device = it,
+                        device = device,
                         showDebug = isDebugMode,
-                        isMainPod = isMainPod,
                     )
 
                     else -> UnknownPodDeviceCardVH.Item(
                         now = now,
-                        device = it,
+                        device = device,
                         showDebug = isDebugMode,
-                        isMainPod = isMainPod,
                     )
                 }
             }.run { items.addAll(this) }
+            
+            // Add unmatched devices section if any exist
+            if (unmatchedDevices.isNotEmpty()) {
+                items.add(UnmatchedDevicesCardVH.Item(
+                    count = unmatchedDevices.size,
+                    isExpanded = showUnmatchedDevices,
+                    onToggle = { toggleUnmatchedDevices() }
+                ))
+                
+                // Show unmatched devices if expanded
+                if (showUnmatchedDevices) {
+                    unmatchedDevices.map { device ->
+                        when (device) {
+                            is DualPodDevice -> DualPodsCardVH.Item(
+                                now = now,
+                                device = device,
+                                showDebug = isDebugMode,
+                            )
+
+                            is SinglePodDevice -> SinglePodsCardVH.Item(
+                                now = now,
+                                device = device,
+                                showDebug = isDebugMode,
+                            )
+
+                            else -> UnknownPodDeviceCardVH.Item(
+                                now = now,
+                                device = device,
+                                showDebug = isDebugMode,
+                            )
+                        }
+                    }.run { items.addAll(this) }
+                }
+            }
         }
 
         items
@@ -193,4 +238,11 @@ class OverviewFragmentVM @Inject constructor(
         launchUpgradeFlow.postValue(call)
     }
 
+    private fun toggleUnmatchedDevices() {
+        showUnmatchedDevices = !showUnmatchedDevices
+    }
+
+    companion object {
+        private val TAG = logTag("Overview", "OverviewFragmentVM")
+    }
 }

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

@@ -0,0 +1,50 @@
+package eu.darken.capod.main.ui.overview.cards
+
+import android.view.ViewGroup
+import eu.darken.capod.R
+import eu.darken.capod.common.lists.binding
+import eu.darken.capod.common.lists.differ.DifferItem
+import eu.darken.capod.databinding.OverviewUnmatchedDevicesItemBinding
+import eu.darken.capod.main.ui.overview.OverviewAdapter
+
+class UnmatchedDevicesCardVH(parent: ViewGroup) :
+    OverviewAdapter.BaseVH<UnmatchedDevicesCardVH.Item, OverviewUnmatchedDevicesItemBinding>(
+        R.layout.overview_unmatched_devices_item,
+        parent
+    ) {
+
+    override val viewBinding = lazy {
+        OverviewUnmatchedDevicesItemBinding.bind(itemView)
+    }
+
+    override val onBindData: OverviewUnmatchedDevicesItemBinding.(
+        item: Item,
+        payloads: List<Any>
+    ) -> Unit = binding(payload = true) { item ->
+        val countText = when (item.count) {
+            1 -> context.getString(R.string.overview_unmatched_devices_count_single)
+            else -> context.getString(R.string.overview_unmatched_devices_count_plural, item.count)
+        }
+        unmatchedCount.text = countText
+        
+        val toggleText = if (item.isExpanded) {
+            context.getString(R.string.general_hide_action)
+        } else {
+            context.getString(R.string.general_show_action)
+        }
+        toggleAction.text = toggleText
+        
+        toggleAction.setOnClickListener { item.onToggle() }
+    }
+
+    data class Item(
+        val count: Int,
+        val isExpanded: Boolean,
+        val onToggle: () -> Unit,
+    ) : OverviewAdapter.Item {
+        override val stableId: Long = Item::class.hashCode().toLong()
+
+        override val payloadProvider: ((DifferItem, DifferItem) -> DifferItem?)
+            get() = { old, new -> if (new::class.isInstance(old)) new else null }
+    }
+}

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

@@ -1,10 +1,10 @@
 package eu.darken.capod.monitor.core
 
 import android.bluetooth.le.ScanFilter
-import eu.darken.capod.common.bluetooth.BleScanResult
 import eu.darken.capod.common.bluetooth.BleScanner
 import eu.darken.capod.common.bluetooth.BluetoothManager2
 import eu.darken.capod.common.bluetooth.ScannerMode
+import eu.darken.capod.common.bluetooth.onlyNewAndUnique
 import eu.darken.capod.common.coroutine.AppScope
 import eu.darken.capod.common.debug.DebugSettings
 import eu.darken.capod.common.debug.logging.Logging.Priority.VERBOSE
@@ -13,18 +13,18 @@ import eu.darken.capod.common.debug.logging.asLog
 import eu.darken.capod.common.debug.logging.log
 import eu.darken.capod.common.debug.logging.logTag
 import eu.darken.capod.common.flow.replayingShare
-import eu.darken.capod.common.flow.setupCommonEventHandlers
 import eu.darken.capod.common.flow.throttleLatest
+import eu.darken.capod.devices.core.DeviceProfilesRepo
 import eu.darken.capod.main.core.GeneralSettings
 import eu.darken.capod.main.core.PermissionTool
 import eu.darken.capod.pods.core.PodDevice
 import eu.darken.capod.pods.core.PodFactory
-import eu.darken.capod.pods.core.apple.ApplePods
 import eu.darken.capod.pods.core.apple.protocol.ProximityPairing
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.firstOrNull
 import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.flowOf
@@ -48,6 +48,7 @@ class PodMonitor @Inject constructor(
     private val debugSettings: DebugSettings,
     private val podDeviceCache: PodDeviceCache,
     permissionTool: PermissionTool,
+    private val profilesRepo: DeviceProfilesRepo,
 ) {
 
     private val deviceCache = mutableMapOf<PodDevice.Id, PodDevice>()
@@ -69,17 +70,9 @@ class PodMonitor @Inject constructor(
                 createBleScanner()
             }
         }
-        .map { newPods ->
-            val pods = processWithCache(newPods)
-
-            val presorted = sortPodsToInterest(pods.values)
-            val main = determineMainDevice(presorted)
-            newPods?.firstOrNull { it.device.identifier == main?.identifier }?.let {
-                podDeviceCache.saveMainDevice(it.scanResult)
-            }
-
-            presorted.sortedByDescending { it == main }
-        }
+        .map { results -> results?.mapNotNull { podFactory.createPod(it) } }
+        .map { processWithCache(it).values }
+        .map { sortPodsToInterest(it) }
         .retryWhen { cause, attempt ->
             log(TAG, WARN) { "PodMonitor failed (attempt=$attempt), will retry: ${cause.asLog()}" }
             delay(3000)
@@ -88,10 +81,18 @@ class PodMonitor @Inject constructor(
         .onStart { emit(emptyList()) }
         .replayingShare(appScope)
 
-    val mainDevice: Flow<PodDevice?> = devices
-        .map { determineMainDevice(it) }
-        .setupCommonEventHandlers(TAG) { "mainDevice" }
-        .replayingShare(appScope)
+    private fun sortPodsToInterest(devices: Collection<PodDevice>): List<PodDevice> {
+        val now = Instant.now()
+        return devices.sortedWith(
+            compareBy<PodDevice> { it.meta.profile?.priority ?: Int.MAX_VALUE }
+                .thenBy {
+                    val age = Duration.between(it.seenLastAt, now).seconds
+                    if (age < 5) 0L else (age / 3L)
+                }
+                .thenByDescending { it.signalQuality }
+                .thenByDescending { (it.seenCounter / 10) }
+        )
+    }
 
     private data class ScannerOptions(
         val scannerMode: ScannerMode,
@@ -139,8 +140,9 @@ class PodMonitor @Inject constructor(
                 disableOffloadFiltering = options.offloadedFilteringDisabled,
                 disableOffloadBatching = options.offloadedBatchingDisabled,
                 disableDirectScanCallback = options.disableDirectCallback,
-            ).map { preFilterAndMap(it) }
+            )
         }
+        .map { it.onlyNewAndUnique() }
 
     private suspend fun processWithCache(
         newPods: List<PodFactory.Result>?
@@ -170,61 +172,12 @@ class PodMonitor @Inject constructor(
         return pods
     }
 
-    private suspend fun preFilterAndMap(rawResults: Collection<BleScanResult>): List<PodFactory.Result> = rawResults
-        .groupBy { it.address }
-        .values
-        .map { sameAdrDevs ->
-            // For each address we only want the newest result, upstream may batch data
-            val newest = sameAdrDevs.maxByOrNull { it.generatedAtNanos }!!
-            sameAdrDevs.minus(newest).let {
-                if (it.isNotEmpty()) log(TAG, VERBOSE) { "Discarding stale results: $it" }
-            }
-            newest
-        }
-        .mapNotNull { podFactory.createPod(it) }
-
-    private fun sortPodsToInterest(pods: Collection<PodDevice>): List<PodDevice> {
-        val now = Instant.now()
-
-        return pods.sortedWith(
-            compareByDescending<PodDevice> { true }
-                .thenBy {
-                    val age = Duration.between(it.seenLastAt, now).seconds
-                    if (age < 5) 0L else (age / 3L)
-                }
-                .thenByDescending { it.signalQuality }
-                .thenByDescending { (it.seenCounter / 10) }
-        )
-    }
-
-    private fun determineMainDevice(pods: List<PodDevice>): PodDevice? {
-        val identityKey = generalSettings.mainDeviceIdentityKey.value?.takeIf { it.isNotEmpty() }
-        if (identityKey != null) {
-            val irkHit = pods.filterIsInstance<ApplePods>().firstOrNull { it.flags.isIRKMatch }
-            log(TAG) { "IRK is configured, main device irkHit=$irkHit" }
-            return irkHit
-        }
-
-        val mainDeviceModel = generalSettings.mainDeviceModel.value
-        val presorted = sortPodsToInterest(pods).sortedByDescending {
-            it.model == mainDeviceModel && it.model != PodDevice.Model.UNKNOWN
-        }
-
-        return presorted.firstOrNull()?.let { candidate ->
-            when {
-                candidate.model == PodDevice.Model.UNKNOWN -> null
-                mainDeviceModel != PodDevice.Model.UNKNOWN && candidate.model != mainDeviceModel -> null
-                candidate.signalQuality <= generalSettings.minimumSignalQuality.value -> null
-                else -> candidate
-            }
-        }
-    }
-
     suspend fun latestMainDevice(): PodDevice? {
-        val currentMain = mainDevice.firstOrNull()
+        val currentMain = devices.firstOrNull()?.firstOrNull()
         log(TAG) { "Live mainDevice is $currentMain" }
 
-        return currentMain ?: podDeviceCache.loadMainDevice()
+        return currentMain ?: profilesRepo.profiles.first().firstOrNull()
+            ?.let { podDeviceCache.load(it.id) }
             ?.let { podFactory.createPod(it)?.device }
             .also { log(TAG) { "Cached mainDevice is $it" } }
     }

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

@@ -0,0 +1,11 @@
+package eu.darken.capod.monitor.core
+
+import eu.darken.capod.pods.core.PodDevice
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+import kotlin.collections.firstOrNull
+
+fun PodMonitor.devicesWithProfiles(): Flow<List<PodDevice>> = devices
+    .map { devices -> devices.filter { it.profile != null } }
+
+fun PodMonitor.primaryDevice(): Flow<PodDevice?> = devicesWithProfiles().map { it.firstOrNull() }

app/src/main/res/layout/overview_unmatched_devices_item.xml

@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="utf-8"?>
+<com.google.android.material.card.MaterialCardView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/card"
+    style="@style/MyCardView"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    tools:context=".main.ui.MainActivity">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:id="@+id/container"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+        <com.google.android.material.textview.MaterialTextView
+            android:id="@+id/unmatched_label"
+            style="@style/TextAppearance.Material3.TitleMedium"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="16dp"
+            android:layout_marginTop="16dp"
+            android:layout_marginEnd="8dp"
+            android:text="@string/overview_unmatched_devices_label"
+            app:layout_constraintEnd_toStartOf="@id/toggle_action"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <com.google.android.material.textview.MaterialTextView
+            android:id="@+id/unmatched_count"
+            style="@style/TextAppearance.Material3.BodyMedium"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="16dp"
+            android:layout_marginTop="4dp"
+            android:layout_marginEnd="8dp"
+            android:layout_marginBottom="16dp"
+            tools:text="3 devices without matching profile"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toStartOf="@id/toggle_action"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/unmatched_label" />
+
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/toggle_action"
+            style="@style/Widget.Material3.Button.TextButton"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginEnd="16dp"
+            android:text="@string/general_show_action"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+</com.google.android.material.card.MaterialCardView>

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

@@ -10,6 +10,8 @@
     <string name="general_save_action">Save</string>
     <string name="general_guide_action">Guide</string>
     <string name="general_continue_action">Continue</string>
+    <string name="general_show_action">Show</string>
+    <string name="general_hide_action">Hide</string>
 
     <string name="general_example_label">E.g.: %s</string>
 
@@ -163,6 +165,9 @@
     <string name="overview_nomaindevice_description">Configure your device to start monitoring battery levels and enable additional features.</string>
     <string name="overview_bluetooth_disabled_label">Bluetooth is disabled</string>
     <string name="overview_bluetooth_disabled_description">Bluetooth is disabled, enable it ;)</string>
+    <string name="overview_unmatched_devices_label">Unmatched devices</string>
+    <string name="overview_unmatched_devices_count_single">1 device without matching profile</string>
+    <string name="overview_unmatched_devices_count_plural">%d devices without matching profile</string>
 
     <string name="permission_bluetooth_connect_label">Bluetooth connect</string>
     <string name="permission_bluetooth_connect_description">This app requires the \"Bluetooth connect\" permission to interact with paired devices and initiate connections.</string>