Auto connect ble, update realtime setting

composeApp/src/iosMain/kotlin/com/digitoolsolutions/app/torquevaultkmp/AppStorage.ios.kt

@@ -1,7 +1,14 @@
 package com.digitoolsolutions.app.torquevaultkmp
 
 import com.digitoolsolutions.app.torquevaultkmp.data.storage.AppStorage
+import kotlinx.coroutines.channels.awaitClose
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.callbackFlow
+import kotlinx.coroutines.flow.filterNotNull
+import kotlinx.coroutines.flow.map
+import platform.Foundation.NSNotificationCenter
 import platform.Foundation.NSUserDefaults
+import platform.Foundation.NSUserDefaultsDidChangeNotification
 import kotlin.reflect.KClass
 
 class AppStoragePlatform : AppStorage {
@@ -28,4 +35,19 @@ class AppStoragePlatform : AppStorage {
     override fun remove(key: String) {
         defaults.removeObjectForKey(key)
     }
+
+    override fun <T : Any> observe(key: String, type: KClass<T>): Flow<T> = callbackFlow {
+        val observer = NSNotificationCenter.defaultCenter.addObserverForName(
+            name = NSUserDefaultsDidChangeNotification,
+            `object` = null,
+            queue = null
+        ) { _ ->
+            load(key, type)?.let { trySend(it) }
+        }
+        // emit initial value
+        load(key, type)?.let { trySend(it) }
+        awaitClose {
+            NSNotificationCenter.defaultCenter.removeObserver(observer)
+        }
+    }.filterNotNull().map { it }
 }