fix(ble): enable Kable preConflate to prevent scan-callback ANRs (#6652)

core/ble/src/androidMain/kotlin/org/meshtastic/core/ble/KablePlatformSetup.kt

@@ -21,9 +21,16 @@ import com.juul.kable.AndroidPeripheral
 import com.juul.kable.Peripheral
 import com.juul.kable.PeripheralBuilder
 import com.juul.kable.PooledThreadingStrategy
+import com.juul.kable.ScannerBuilder
 import com.juul.kable.toIdentifier
 import org.meshtastic.core.model.util.anonymize
 
+// Kable's default trySendBlocking can park the scan-callback (sometimes main) thread in dense BLE
+// environments, causing ANRs; preConflate drops excess advertisements instead (kable#654).
+internal actual fun ScannerBuilder.platformScanConfig() {
+    preConflate = true
+}
+
 /** Android's scanner filters on address in hardware, so Kable's `Filter.Address` works natively here. */
 internal actual val supportsNativeAddressScanFilter: Boolean = true
 

core/ble/src/commonMain/kotlin/org/meshtastic/core/ble/KableBleScanner.kt

@@ -75,6 +75,7 @@ open class KableBleScanner(private val loggingConfig: BleLoggingConfig) : BleSca
 
     internal open fun advertisements(filter: KableScanFilter): Flow<KableScanResult> {
         val scanner = Scanner {
+            platformScanConfig()
             logging { applyConfig(loggingConfig) }
             when (filter) {
                 KableScanFilter.None -> Unit

core/ble/src/commonMain/kotlin/org/meshtastic/core/ble/KablePlatformSetup.kt

@@ -18,6 +18,10 @@ package org.meshtastic.core.ble
 
 import com.juul.kable.Peripheral
 import com.juul.kable.PeripheralBuilder
+import com.juul.kable.ScannerBuilder
+
+/** Platform-specific configuration for the Scanner builder (e.g. Android's `preConflate`). */
+internal expect fun ScannerBuilder.platformScanConfig()
 
 /**
  * Whether Kable honours a scan filter on device address here. Android only: `Filter.Address` throws on Apple/JS, and

core/ble/src/iosMain/kotlin/org/meshtastic/core/ble/NoopStubs.kt

@@ -18,10 +18,15 @@ package org.meshtastic.core.ble
 
 import com.juul.kable.Peripheral
 import com.juul.kable.PeripheralBuilder
+import com.juul.kable.ScannerBuilder
 
 // Kable's `Filter.Address` throws UnsupportedOperationException on Apple.
 internal actual val supportsNativeAddressScanFilter: Boolean = false
 
+internal actual fun ScannerBuilder.platformScanConfig() {
+    // No-op: preConflate is Android-only.
+}
+
 /** No-op stubs for iOS target in core:ble. */
 internal actual fun PeripheralBuilder.platformConfig(device: BleDevice, autoConnect: () -> Boolean) {
     // No-op for stubs

core/ble/src/jvmMain/kotlin/org/meshtastic/core/ble/KablePlatformSetup.kt

@@ -18,8 +18,13 @@ package org.meshtastic.core.ble
 
 import com.juul.kable.Peripheral
 import com.juul.kable.PeripheralBuilder
+import com.juul.kable.ScannerBuilder
 import com.juul.kable.toIdentifier
 
+internal actual fun ScannerBuilder.platformScanConfig() {
+    // No-op: preConflate is Android-only.
+}
+
 // Kable's btleplug backend evaluates scan filters with a hardcoded `address = null`, so an address filter matches
 // nothing and the scan yields no advertisements at all.
 internal actual val supportsNativeAddressScanFilter: Boolean = false