feat(connections): detect & inform about disabled Bluetooth / Wi-Fi

Mirror the GPS-disabled-vs-permission-denied distinction for the BLE and
network transports:

- core/ui: add isBluetoothDisabled() (adapter off) + isWifiUnavailable()
  (no Wi-Fi/Ethernet), plus rememberOpenBluetoothSettings()/rememberOpenWifiSettings()
  — alongside the existing isGpsDisabled()/rememberOpenLocationSettings()
- extract a reusable RecoveryCard from PermissionRecoveryCard (errorContainer
  message box + one recovery action); PermissionRecoveryCard now delegates to it
- ConnectionsScreen: when a transport's permission is granted but its adapter is
  off, show an inline recovery banner. The BLE scan toggle routes to Bluetooth
  settings when the radio is off (scanning can't work); the network banner is
  informational (manual TCP can still work off-Wi-Fi)
- detection refreshes on ON_RESUME, so the banner clears after the user returns
  from the adapter settings screen

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.skills/compose-ui/strings-index.txt

@@ -110,6 +110,7 @@ blue
 bluetooth
 bluetooth_available_devices
 bluetooth_config
+bluetooth_disabled
 bluetooth_enabled
 bluetooth_feature_config
 bluetooth_feature_config_description
@@ -1015,10 +1016,13 @@ one_month
 one_week
 one_wire_temperature
 only_favorites
+### OPEN ###
+open_bluetooth_settings
 open_compass
 open_settings
 open_source_description
 open_source_libraries
+open_wifi_settings
 options
 orient_north
 ### OUTPUT ###
@@ -1537,6 +1541,7 @@ wifi_provisioning
 wifi_qr_code_error
 wifi_qr_code_scan
 wifi_rssi_threshold_defaults_to_80
+wifi_unavailable
 ### WIND ###
 wind
 wind_direction

core/resources/src/commonMain/composeResources/values/strings.xml

@@ -128,6 +128,7 @@
     <string name="bluetooth">Bluetooth</string>
     <string name="bluetooth_available_devices">Available Bluetooth Devices</string>
     <string name="bluetooth_config">Bluetooth Config</string>
+    <string name="bluetooth_disabled">Bluetooth is off. Turn it on to scan for nearby devices.</string>
     <string name="bluetooth_enabled">Bluetooth enabled</string>
     <string name="bluetooth_feature_config">Configuration</string>
     <string name="bluetooth_feature_config_description">Wirelessly manage your device settings and channels.</string>
@@ -1045,10 +1046,13 @@
     <string name="one_week">1W</string>
     <string name="one_wire_temperature">1-Wire Temp</string>
     <string name="only_favorites">Only Favorites</string>
+    <!-- OPEN -->
+    <string name="open_bluetooth_settings">Open Bluetooth settings</string>
     <string name="open_compass">Open Compass</string>
     <string name="open_settings">Open settings</string>
     <string name="open_source_description">Meshtastic is built with the following open source libraries. Tap any library to view its license.</string>
     <string name="open_source_libraries">Open Source Libraries</string>
+    <string name="open_wifi_settings">Open Wi-Fi settings</string>
     <string name="options">Options</string>
     <string name="orient_north">Orient north</string>
     <!-- OUTPUT -->
@@ -1582,6 +1586,7 @@
     <string name="wifi_qr_code_error">Invalid WiFi Credential QR code format</string>
     <string name="wifi_qr_code_scan">Scan WiFi QR code</string>
     <string name="wifi_rssi_threshold_defaults_to_80">WiFi RSSI threshold (defaults to -80)</string>
+    <string name="wifi_unavailable">Not connected to Wi-Fi. Network scan may not find nearby devices.</string>
     <!-- WIND -->
     <string name="wind">Wind</string>
     <string name="wind_direction">Wind Dir</string>

core/ui/src/androidMain/kotlin/org/meshtastic/core/ui/util/PlatformUtils.kt

@@ -18,9 +18,13 @@
 
 package org.meshtastic.core.ui.util
 
+import android.bluetooth.BluetoothManager
 import android.content.ActivityNotFoundException
+import android.content.Context
 import android.content.Intent
 import android.content.pm.PackageManager
+import android.net.ConnectivityManager
+import android.net.NetworkCapabilities
 import android.net.Uri
 import android.provider.Settings
 import androidx.activity.compose.LocalActivity
@@ -215,6 +219,62 @@ actual fun isGpsDisabled(): Boolean {
     return rememberOnResumeState { context.gpsDisabled() }
 }
 
+@Composable
+actual fun rememberOpenBluetoothSettings(): () -> Unit {
+    val context = LocalContext.current
+    return remember(context) {
+        {
+            try {
+                context.startActivity(
+                    Intent(Settings.ACTION_BLUETOOTH_SETTINGS).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK),
+                )
+            } catch (ex: ActivityNotFoundException) {
+                Logger.w(ex) { "No Bluetooth settings activity available" }
+            }
+        }
+    }
+}
+
+@Composable
+actual fun rememberOpenWifiSettings(): () -> Unit {
+    val context = LocalContext.current
+    return remember(context) {
+        {
+            try {
+                context.startActivity(Intent(Settings.ACTION_WIFI_SETTINGS).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK))
+            } catch (ex: ActivityNotFoundException) {
+                Logger.w(ex) { "No Wi-Fi settings activity available" }
+            }
+        }
+    }
+}
+
+@Composable
+actual fun isBluetoothDisabled(): Boolean {
+    val context = LocalContext.current
+    return rememberOnResumeState {
+        // adapter == null means the device has no Bluetooth at all — not "disabled", so don't nag.
+        val adapter = (context.getSystemService(Context.BLUETOOTH_SERVICE) as? BluetoothManager)?.adapter
+        adapter != null && !adapter.isEnabled
+    }
+}
+
+@Composable
+actual fun isWifiUnavailable(): Boolean {
+    val context = LocalContext.current
+    return rememberOnResumeState {
+        val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as? ConnectivityManager
+        val capabilities = cm?.activeNetwork?.let { cm.getNetworkCapabilities(it) }
+        val onLocalNetwork =
+            capabilities != null &&
+                (
+                    capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) ||
+                        capabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET)
+                    )
+        !onLocalNetwork
+    }
+}
+
 @Composable
 actual fun rememberOpenAppSettings(): () -> Unit {
     val context = LocalContext.current

core/ui/src/commonMain/kotlin/org/meshtastic/core/ui/component/PermissionRecoveryCard.kt

@@ -31,6 +31,7 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.unit.dp
 import org.jetbrains.compose.resources.stringResource
 import org.meshtastic.core.resources.Res
@@ -43,26 +44,23 @@ import org.meshtastic.core.ui.util.PermissionStatus
 import org.meshtastic.core.ui.util.PermissionUiState
 
 /**
- * A reusable error-state card for a missing runtime permission. Generalizes the compass warning/recovery pattern so
- * every feature presents context plus a single, context-correct recovery action:
- * - [PermissionStatus.NOT_REQUESTED] / [PermissionStatus.DENIED_CAN_RETRY] — shows a "Grant permission" button that
- *   re-launches the in-context request.
- * - [PermissionStatus.PERMANENTLY_DENIED] — shows an "Open settings" button (user-initiated recovery) because the
- *   system will no longer show the dialog.
- * - [PermissionStatus.GRANTED] — renders nothing.
+ * A reusable error-state card: an `errorContainer` message box plus one full-width recovery action. Generalizes the
+ * compass warning/recovery pattern so any feature can present context plus a single corrective action (request a
+ * permission, open Bluetooth/Wi-Fi/app settings, etc.).
  *
- * @param rationale a feature-specific explanation of why the permission is needed.
+ * @param message the user-facing explanation of what is wrong.
+ * @param actionLabel the recovery button label.
+ * @param onAction invoked when the recovery button is tapped.
+ * @param actionIcon optional leading icon for the recovery button.
  */
 @Composable
-internal fun PermissionRecoveryCard(
-    status: PermissionStatus,
-    rationale: String,
-    onRequest: () -> Unit,
-    onOpenSettings: () -> Unit,
+fun RecoveryCard(
+    message: String,
+    actionLabel: String,
+    onAction: () -> Unit,
     modifier: Modifier = Modifier,
+    actionIcon: ImageVector? = null,
 ) {
-    if (status == PermissionStatus.GRANTED) return
-
     Column(modifier = modifier.fillMaxWidth(), verticalArrangement = Arrangement.spacedBy(8.dp)) {
         Surface(
             tonalElevation = 2.dp,
@@ -81,27 +79,61 @@ internal fun PermissionRecoveryCard(
                     tint = MaterialTheme.colorScheme.onErrorContainer,
                 )
                 Text(
-                    text = rationale,
+                    text = message,
                     color = MaterialTheme.colorScheme.onErrorContainer,
                     style = MaterialTheme.typography.bodyMedium,
                 )
             }
         }
 
-        if (status == PermissionStatus.PERMANENTLY_DENIED) {
-            Button(onClick = onOpenSettings, modifier = Modifier.fillMaxWidth()) {
-                Icon(imageVector = MeshtasticIcons.AppSettingsAlt, contentDescription = null)
+        Button(onClick = onAction, modifier = Modifier.fillMaxWidth()) {
+            if (actionIcon != null) {
+                Icon(imageVector = actionIcon, contentDescription = null)
                 Spacer(modifier = Modifier.width(8.dp))
-                Text(text = stringResource(Res.string.open_settings))
-            }
-        } else {
-            Button(onClick = onRequest, modifier = Modifier.fillMaxWidth()) {
-                Text(text = stringResource(Res.string.grant_permission))
             }
+            Text(text = actionLabel)
         }
     }
 }
 
+/**
+ * A [RecoveryCard] specialized for a missing runtime permission, presenting a context-correct recovery action:
+ * - [PermissionStatus.NOT_REQUESTED] / [PermissionStatus.DENIED_CAN_RETRY] — shows a "Grant permission" button that
+ *   re-launches the in-context request.
+ * - [PermissionStatus.PERMANENTLY_DENIED] — shows an "Open settings" button (user-initiated recovery) because the
+ *   system will no longer show the dialog.
+ * - [PermissionStatus.GRANTED] — renders nothing.
+ *
+ * @param rationale a feature-specific explanation of why the permission is needed.
+ */
+@Composable
+internal fun PermissionRecoveryCard(
+    status: PermissionStatus,
+    rationale: String,
+    onRequest: () -> Unit,
+    onOpenSettings: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    if (status == PermissionStatus.GRANTED) return
+
+    if (status == PermissionStatus.PERMANENTLY_DENIED) {
+        RecoveryCard(
+            message = rationale,
+            actionLabel = stringResource(Res.string.open_settings),
+            onAction = onOpenSettings,
+            modifier = modifier,
+            actionIcon = MeshtasticIcons.AppSettingsAlt,
+        )
+    } else {
+        RecoveryCard(
+            message = rationale,
+            actionLabel = stringResource(Res.string.grant_permission),
+            onAction = onRequest,
+            modifier = modifier,
+        )
+    }
+}
+
 /** Convenience overload that reads the status and actions directly from a [PermissionUiState]. */
 @Composable
 fun PermissionRecoveryCard(state: PermissionUiState, rationale: String, modifier: Modifier = Modifier) {

core/ui/src/commonMain/kotlin/org/meshtastic/core/ui/util/PlatformUtils.kt

@@ -58,12 +58,30 @@ expect fun rememberSaveFileLauncher(
 /** Returns a launcher to open the platform's location settings. */
 @Composable expect fun rememberOpenLocationSettings(): () -> Unit
 
+/** Returns a launcher to open the platform's Bluetooth settings. */
+@Composable expect fun rememberOpenBluetoothSettings(): () -> Unit
+
+/** Returns a launcher to open the platform's Wi-Fi settings. */
+@Composable expect fun rememberOpenWifiSettings(): () -> Unit
+
 /**
  * Returns whether GPS/location services are currently disabled at the system level. Always `false` on platforms where
  * this concept doesn't apply.
  */
 @Composable expect fun isGpsDisabled(): Boolean
 
+/**
+ * Returns whether Bluetooth is currently turned off at the system level (the adapter exists but is disabled). Always
+ * `false` on devices without Bluetooth and on platforms where the concept doesn't apply.
+ */
+@Composable expect fun isBluetoothDisabled(): Boolean
+
+/**
+ * Returns whether the device currently lacks a local-network-capable connection (no active Wi-Fi or Ethernet). NSD/mDNS
+ * discovery needs a LAN, so this surfaces the "connect to Wi-Fi" hint. Always `false` where the concept doesn't apply.
+ */
+@Composable expect fun isWifiUnavailable(): Boolean
+
 /** Returns a function that opens this app's system settings page (where the user can change any permission). */
 @Composable expect fun rememberOpenAppSettings(): () -> Unit
 

core/ui/src/iosMain/kotlin/org/meshtastic/core/ui/util/NoopStubs.kt

@@ -52,8 +52,16 @@ actual fun rememberOpenFileLauncher(onUriReceived: (CommonUri?) -> Unit): (mimeT
 
 @Composable actual fun rememberOpenLocationSettings(): () -> Unit = {}
 
+@Composable actual fun rememberOpenBluetoothSettings(): () -> Unit = {}
+
+@Composable actual fun rememberOpenWifiSettings(): () -> Unit = {}
+
 @Composable actual fun isGpsDisabled(): Boolean = false
 
+@Composable actual fun isBluetoothDisabled(): Boolean = false
+
+@Composable actual fun isWifiUnavailable(): Boolean = false
+
 @Composable actual fun SetScreenBrightness(brightness: Float) {}
 
 @Composable actual fun rememberOpenAppSettings(): () -> Unit = {}

core/ui/src/jvmMain/kotlin/org/meshtastic/core/ui/util/PlatformUtils.kt

@@ -118,9 +118,25 @@ actual fun KeepScreenOn(enabled: Boolean) {
 @Composable
 actual fun rememberOpenLocationSettings(): () -> Unit = { Logger.w { "Location settings not implemented on Desktop" } }
 
+/** JVM stub — Bluetooth settings are not available on Desktop. */
+@Composable
+actual fun rememberOpenBluetoothSettings(): () -> Unit = {
+    Logger.w { "Bluetooth settings not available on JVM/Desktop" }
+}
+
+/** JVM stub — Wi-Fi settings are not available on Desktop. */
+@Composable
+actual fun rememberOpenWifiSettings(): () -> Unit = { Logger.w { "Wi-Fi settings not available on JVM/Desktop" } }
+
 /** JVM — GPS is never disabled on Desktop (concept doesn't apply). */
 @Composable actual fun isGpsDisabled(): Boolean = false
 
+/** JVM — Bluetooth adapter state is not surfaced on Desktop. */
+@Composable actual fun isBluetoothDisabled(): Boolean = false
+
+/** JVM — local-network availability is not gated on Desktop. */
+@Composable actual fun isWifiUnavailable(): Boolean = false
+
 /** JVM stub — app settings are not available on Desktop. */
 @Composable
 actual fun rememberOpenAppSettings(): () -> Unit = { Logger.w { "App settings not available on JVM/Desktop" } }

feature/connections/src/commonMain/kotlin/org/meshtastic/feature/connections/ui/ConnectionsScreen.kt

@@ -54,19 +54,29 @@ import org.meshtastic.core.model.ConnectionState
 import org.meshtastic.core.navigation.Route
 import org.meshtastic.core.navigation.SettingsRoute
 import org.meshtastic.core.resources.Res
+import org.meshtastic.core.resources.bluetooth_disabled
 import org.meshtastic.core.resources.connections
 import org.meshtastic.core.resources.no_device_selected
+import org.meshtastic.core.resources.open_bluetooth_settings
+import org.meshtastic.core.resources.open_wifi_settings
 import org.meshtastic.core.resources.set_your_region
 import org.meshtastic.core.resources.unknown_device
+import org.meshtastic.core.resources.wifi_unavailable
 import org.meshtastic.core.ui.component.AdaptiveTwoPane
 import org.meshtastic.core.ui.component.ListItem
 import org.meshtastic.core.ui.component.MainAppBar
+import org.meshtastic.core.ui.component.RecoveryCard
+import org.meshtastic.core.ui.icon.Bluetooth
 import org.meshtastic.core.ui.icon.Language
 import org.meshtastic.core.ui.icon.MeshtasticIcons
 import org.meshtastic.core.ui.icon.NoDevice
 import org.meshtastic.core.ui.util.PermissionStatus
+import org.meshtastic.core.ui.util.isBluetoothDisabled
+import org.meshtastic.core.ui.util.isWifiUnavailable
 import org.meshtastic.core.ui.util.rememberBluetoothPermissionState
 import org.meshtastic.core.ui.util.rememberLocalNetworkPermissionState
+import org.meshtastic.core.ui.util.rememberOpenBluetoothSettings
+import org.meshtastic.core.ui.util.rememberOpenWifiSettings
 import org.meshtastic.core.ui.viewmodel.ConnectionStatus
 import org.meshtastic.core.ui.viewmodel.ConnectionsViewModel
 import org.meshtastic.feature.connections.MOCK_DEVICE_PREFIX
@@ -131,6 +141,13 @@ fun ConnectionsScreen(
     val localNetworkPermission = rememberLocalNetworkPermissionState()
     val bluetoothPermission = rememberBluetoothPermissionState()
 
+    // Adapter-state, distinct from permission state: a permission can be granted while Bluetooth is off or the device
+    // is off Wi-Fi. Detected separately so the UI can route to the adapter's settings rather than re-prompting.
+    val bluetoothDisabled = isBluetoothDisabled()
+    val wifiUnavailable = isWifiUnavailable()
+    val openBluetoothSettings = rememberOpenBluetoothSettings()
+    val openWifiSettings = rememberOpenWifiSettings()
+
     // Auto-start BLE scan when the screen is visible (lifecycle ≥ STARTED) and the user has previously opted in.
     // LifecycleStartEffect stops scanning on ON_STOP (app backgrounded) and restarts on ON_START — preventing
     // continuous background BLE radio usage that drains the battery.
@@ -274,6 +291,24 @@ fun ConnectionsScreen(
                             onToggleNetwork = { scanModel.setShowNetworkTransport(!showNetworkTransport) },
                             onToggleUsb = { scanModel.setShowUsbTransport(!showUsbTransport) },
                         )
+
+                        // Adapter-off hints: shown only when the relevant permission is granted but the radio/network
+                        // is unavailable, so they don't overlap the permission-recovery flow on the scan toggles.
+                        if (showBleTransport && bluetoothPermission.isGranted && bluetoothDisabled) {
+                            RecoveryCard(
+                                message = stringResource(Res.string.bluetooth_disabled),
+                                actionLabel = stringResource(Res.string.open_bluetooth_settings),
+                                onAction = openBluetoothSettings,
+                                actionIcon = MeshtasticIcons.Bluetooth,
+                            )
+                        }
+                        if (showNetworkTransport && localNetworkPermission.isGranted && wifiUnavailable) {
+                            RecoveryCard(
+                                message = stringResource(Res.string.wifi_unavailable),
+                                actionLabel = stringResource(Res.string.open_wifi_settings),
+                                onAction = openWifiSettings,
+                            )
+                        }
                     },
                     second = {
                         // ── Unified device list ──
@@ -293,7 +328,13 @@ fun ConnectionsScreen(
                                 onSelectDevice = { scanModel.onSelected(it) },
                                 onToggleBleScan = {
                                     when {
-                                        isBleScanning || bluetoothPermission.isGranted -> scanModel.toggleBleScan()
+                                        // Always allow stopping an in-progress scan.
+                                        isBleScanning -> scanModel.toggleBleScan()
+
+                                        // Granted but the radio is off — scanning can't work, so open BT settings.
+                                        bluetoothPermission.isGranted && bluetoothDisabled -> openBluetoothSettings()
+
+                                        bluetoothPermission.isGranted -> scanModel.toggleBleScan()
 
                                         // Permanently denied: the system won't prompt again, so send to settings.
                                         bluetoothPermission.status == PermissionStatus.PERMANENTLY_DENIED ->