feat(ble): unbondSmart() · 삭제 시 자동 재연결 + 오프라인 경고 팝업 (cloud-mvp 1982399 이식)

app/src/main/java/com/medithings/vesiscan/ble/BleManager.kt

@@ -410,6 +410,60 @@ class BleManager private constructor(private val context: Context) {
         debugLogger.info("DEVICE_UNREGISTERED $address")
     }
 
+    /**
+     * 스마트 삭제 (2026-08-04): 미연결 상태에서 삭제 시 기기 재연결 후 msr? 전송.
+     *
+     * 배경: 기기가 오프라인일 때 unbondAndRemoveAddress() 는 폰 측 LTK 만 삭제 →
+     *   기기는 여전히 이전 LTK 를 기대 · 재페어링 시 PIN 불일치 · 사용자가 기기
+     *   15초 롱프레스로 강제 초기화해야만 재페어링 가능.
+     *
+     * 이 함수는:
+     *   - 이미 연결됨 → disconnectAndUnbond() (msr? + 양쪽 removeBond) → onSuccess
+     *   - 미연결 → timeoutMs 재연결 시도
+     *       성공 → disconnectAndUnbond() → onSuccess
+     *       실패 → onDeviceOffline() (UI 가 강제 삭제 결정)
+     */
+    fun unbondSmart(
+        address: String,
+        timeoutMs: Long = 5_000L,
+        onSuccess: () -> Unit,
+        onDeviceOffline: () -> Unit,
+    ) {
+        if (bluetoothGatt?.device?.address == address && isServiceReady.value) {
+            disconnectAndUnbond()
+            onSuccess()
+            return
+        }
+        debugLogger.info("UNBOND_SMART attempting reconnect for $address (timeout=${timeoutMs}ms)")
+
+        val adapter = bluetoothAdapter ?: run { onDeviceOffline(); return }
+        val device = runCatching { adapter.getRemoteDevice(address) }.getOrNull()
+        if (device == null) { onDeviceOffline(); return }
+
+        val timeoutRunnable = Runnable {
+            debugLogger.warn("UNBOND_SMART timeout · reconnect failed for $address")
+            try { bluetoothGatt?.disconnect(); bluetoothGatt?.close() } catch (_: Exception) {}
+            bluetoothGatt = null
+            isConnecting.value = false
+            onDeviceOffline()
+        }
+
+        val originalCallback = onConnectionStateChanged
+        onConnectionStateChanged = { connected ->
+            originalCallback?.invoke(connected)
+            if (connected && bluetoothGatt?.device?.address == address) {
+                handler.removeCallbacks(timeoutRunnable)
+                onConnectionStateChanged = originalCallback
+                debugLogger.info("UNBOND_SMART reconnected · sending msr? for full unbond")
+                disconnectAndUnbond()
+                onSuccess()
+            }
+        }
+
+        handler.postDelayed(timeoutRunnable, timeoutMs)
+        connectByAddress(address, address)
+    }
+
     /**
      * 저장된 기기 주소로 직접 연결. 스캔 결과에 안 잡혀도 OS bond 가 있으면 바로 됨.
      * KnownDeviceStore 에서 골라 호출.

app/src/main/java/com/medithings/vesiscan/ui/views/connection/DeviceScanView.kt

@@ -47,6 +47,9 @@ import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale
 
+/** 저장된 기기 삭제 다이얼로그 상태 (2026-08-04 · BLE bonding 대칭성 fix). */
+private enum class UnpairPhase { Confirm, Reconnecting, OfflineWarning }
+
 @Composable
 fun DeviceScanView(appState: AppState) {
     val context = LocalContext.current
@@ -375,23 +378,57 @@ fun DeviceScanView(appState: AppState) {
             }
         }
 
-        // Delete Known Device 확인 다이얼로그
+        // Delete Known Device — 2단계 다이얼로그 (2026-08-04 · BLE bonding 대칭성 fix).
+        var unpairPhase by remember { mutableStateOf<UnpairPhase>(UnpairPhase.Confirm) }
         pendingDelete?.let { target ->
-            AlertDialog(
-                onDismissRequest = { pendingDelete = null },
-                title = { Text(stringResource(R.string.unpair_title)) },
-                text = { Text(stringResource(R.string.unpair_message, target.name)) },
-                confirmButton = {
-                    TextButton(onClick = {
-                        bleManager.unbondAndRemoveAddress(target.address)
-                        knownDevices = KnownDeviceStore.getAll(context)
-                        pendingDelete = null
-                    }) { Text(stringResource(R.string.unpair_confirm), color = Color.Red) }
-                },
-                dismissButton = {
-                    TextButton(onClick = { pendingDelete = null }) { Text(stringResource(R.string.cancel)) }
-                }
-            )
+            when (unpairPhase) {
+                UnpairPhase.Confirm -> AlertDialog(
+                    onDismissRequest = { pendingDelete = null; unpairPhase = UnpairPhase.Confirm },
+                    title = { Text(stringResource(R.string.unpair_title)) },
+                    text = { Text(stringResource(R.string.unpair_message, target.name)) },
+                    confirmButton = {
+                        TextButton(onClick = {
+                            unpairPhase = UnpairPhase.Reconnecting
+                            bleManager.unbondSmart(
+                                address = target.address,
+                                onSuccess = {
+                                    knownDevices = KnownDeviceStore.getAll(context)
+                                    pendingDelete = null
+                                    unpairPhase = UnpairPhase.Confirm
+                                },
+                                onDeviceOffline = { unpairPhase = UnpairPhase.OfflineWarning },
+                            )
+                        }) { Text(stringResource(R.string.unpair_confirm), color = Color.Red) }
+                    },
+                    dismissButton = {
+                        TextButton(onClick = { pendingDelete = null }) { Text(stringResource(R.string.cancel)) }
+                    }
+                )
+                UnpairPhase.Reconnecting -> AlertDialog(
+                    onDismissRequest = { /* 대기 필수 */ },
+                    title = { Text(stringResource(R.string.unpair_reconnecting_title)) },
+                    text = { Text(stringResource(R.string.unpair_reconnecting_desc)) },
+                    confirmButton = { },
+                )
+                UnpairPhase.OfflineWarning -> AlertDialog(
+                    onDismissRequest = { pendingDelete = null; unpairPhase = UnpairPhase.Confirm },
+                    title = { Text(stringResource(R.string.unpair_offline_title)) },
+                    text = { Text(stringResource(R.string.unpair_offline_desc)) },
+                    confirmButton = {
+                        TextButton(onClick = {
+                            bleManager.unbondAndRemoveAddress(target.address)
+                            knownDevices = KnownDeviceStore.getAll(context)
+                            pendingDelete = null
+                            unpairPhase = UnpairPhase.Confirm
+                        }) { Text(stringResource(R.string.unpair_force_delete), color = Color.Red) }
+                    },
+                    dismissButton = {
+                        TextButton(onClick = {
+                            unpairPhase = UnpairPhase.Confirm
+                        }) { Text(stringResource(R.string.unpair_retry_connect)) }
+                    }
+                )
+            }
         }
 
         // Scan button

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

@@ -147,6 +147,13 @@
     <string name="unpair_title">페어링 해제</string>
     <string name="unpair_message">%s 의 페어링을 해제합니다. 다시 사용하려면 PIN 재입력이 필요합니다.</string>
     <string name="unpair_confirm">해제</string>
+    <!-- 2026-08-04 · BLE bonding 대칭성 fix (unbondSmart flow) -->
+    <string name="unpair_reconnecting_title">기기 재연결 중…</string>
+    <string name="unpair_reconnecting_desc">기기에 접속해 양쪽 페어링 정보를 함께 삭제합니다. 이 과정 없이 삭제하면 다음 페어링 시 기기 초기화가 필요할 수 있습니다.</string>
+    <string name="unpair_offline_title">기기가 응답하지 않습니다</string>
+    <string name="unpair_offline_desc">기기가 오프라인 상태입니다. 여기서 삭제하면 이 폰의 페어링 정보만 지워지며, 다음 페어링 시 기기 초기화가 필요합니다 (전원 15초 롱프레스).\n\n선택하세요:</string>
+    <string name="unpair_force_delete">강제 삭제</string>
+    <string name="unpair_retry_connect">기기 켜고 다시 시도</string>
 
     <!-- Reminder Notifications -->
     <string name="notification_channel_name">배뇨 알림</string>

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

@@ -147,6 +147,13 @@
     <string name="unpair_title">Unpair Device</string>
     <string name="unpair_message">Unpair %s. PIN re-entry will be required to use it again.</string>
     <string name="unpair_confirm">Unpair</string>
+    <!-- 2026-08-04 · BLE bonding 대칭성 fix (unbondSmart flow) -->
+    <string name="unpair_reconnecting_title">Reconnecting to device…</string>
+    <string name="unpair_reconnecting_desc">Contacting the device to clear pairing on both sides. This ensures re-pairing works without device reset.</string>
+    <string name="unpair_offline_title">Device is offline</string>
+    <string name="unpair_offline_desc">The device did not respond. Deleting here will remove pairing on this phone only. To pair again, the device will need to be reset (long-press power button for 15 seconds).\n\nChoose an action:</string>
+    <string name="unpair_force_delete">Force delete</string>
+    <string name="unpair_retry_connect">Turn on device &amp; retry</string>
 
     <!-- Reminder Notifications -->
     <string name="notification_channel_name">Voiding reminder</string>