android: keepalive/rekey alarms on elapsedRealtime with coalescing; BootReceiver re-arms pause and scenario alarms; scenarios survive a fresh process and run without network rules; watchdog-restored auto session parks again; NetworkManager tracks a network set; idle native engine goes dormant again; traffic history written every 5 min

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/frontends/android/app/src/main/AndroidManifest.xml

@@ -27,6 +27,7 @@
     <!-- SSID is redacted in the background on Android 10+ without this. -->
     <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
     <uses-permission android:name="android.permission.NEARBY_WIFI_DEVICES" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SPECIAL_USE" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
@@ -339,6 +340,17 @@
                 <action android:name="android.intent.action.MY_PACKAGE_REPLACED" />
             </intent-filter>
         </receiver>
+
+        <!-- after a reboot or a clock change: re-arm the pause and scenario alarms, evaluate the rules again -->
+        <receiver
+            android:name=".logic.BootReceiver"
+            android:exported="false">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+                <action android:name="android.intent.action.TIME_SET" />
+                <action android:name="android.intent.action.TIMEZONE_CHANGED" />
+            </intent-filter>
+        </receiver>
     </application>
 
 </manifest>

src/frontends/android/app/src/main/java/org/strongswan/android/logic/BootReceiver.kt

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2026 SHX VPN
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+package org.strongswan.android.logic
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import org.strongswan.android.logic.autoconnect.AutoConnectManager
+import org.strongswan.android.logic.scenarios.ScenarioEngine
+
+/**
+ * Picks the automation up again after a reboot or a change of the clock.
+ *
+ * Starting the process runs the application's start-up (network rules, scenarios),
+ * but alarms do not survive a reboot, and a time or time zone change moves the
+ * edges of the scenario time windows.  This receiver re-arms what the alarms
+ * carried and lets the rules decide again.  It never starts the tunnel by itself:
+ * the rules and scenarios do, and a profile without a saved password stays off.
+ */
+class BootReceiver : BroadcastReceiver()
+{
+	override fun onReceive(context: Context, intent: Intent?)
+	{
+		val action = intent?.action ?: return
+		DiagLog.i(TAG, "system event: $action")
+		if (action == Intent.ACTION_BOOT_COMPLETED)
+		{
+			PauseManager.rearmAfterRestart(context)
+		}
+		/* start() re-arms the time-window alarm for the current clock and zone */
+		ScenarioEngine.start(context)
+		AutoConnectManager.getInstance(context).reevaluate()
+		val pending = goAsync()
+		ScenarioEngine.evaluateWhenReady(context) { pending.finish() }
+	}
+
+	private companion object
+	{
+		const val TAG = "BootReceiver"
+	}
+}

src/frontends/android/app/src/main/java/org/strongswan/android/logic/NetworkManager.java

@@ -25,6 +25,7 @@ import android.net.Network;
 import android.net.NetworkRequest;
 import android.os.Build;
 
+import java.util.HashSet;
 import java.util.LinkedList;
 
 public class NetworkManager extends BroadcastReceiver implements Runnable
@@ -33,7 +34,9 @@ public class NetworkManager extends BroadcastReceiver implements Runnable
 	private volatile boolean mRegistered;
 	private ConnectivityManager.NetworkCallback mCallback;
 	private Thread mEventNotifier;
-	private int mConnectedNetworks = 0;
+	/* a set, not a counter: a repeated onAvailable or a missed onLost cannot
+	 * make it drift away from the networks that really exist */
+	private final HashSet<Network> mConnectedNetworks = new HashSet<>();
 	private LinkedList<Boolean> mEvents = new LinkedList<>();
 
 	public NetworkManager(Context context)
@@ -51,7 +54,7 @@ public class NetworkManager extends BroadcastReceiver implements Runnable
 					{
 						/* we expect this to be called if connected to at least one network during
 						 * callback registration */
-						mConnectedNetworks += 1;
+						mConnectedNetworks.add(network);
 						mEvents.addLast(true);
 						NetworkManager.this.notifyAll();
 					}
@@ -63,8 +66,8 @@ public class NetworkManager extends BroadcastReceiver implements Runnable
 					synchronized (NetworkManager.this)
 					{
 						/* in particular mobile connections are disconnected overlapping with WiFi */
-						mConnectedNetworks -= 1;
+						mConnectedNetworks.remove(network);
-						mEvents.addLast(mConnectedNetworks > 0);
+						mEvents.addLast(!mConnectedNetworks.isEmpty());
 						NetworkManager.this.notifyAll();
 					}
 				}
@@ -74,7 +77,11 @@ public class NetworkManager extends BroadcastReceiver implements Runnable
 
 	public void Register()
 	{
-		mEvents.clear();
+		synchronized (this)
+		{
+			mEvents.clear();
+			mConnectedNetworks.clear();
+		}
 		mRegistered = true;
 		mEventNotifier = new Thread(this);
 		mEventNotifier.start();
@@ -174,6 +181,12 @@ public class NetworkManager extends BroadcastReceiver implements Runnable
 					break;
 				}
 				connected = mEvents.removeFirst();
+				/* a burst of identical states (several networks coming up at once)
+				 * is one change for charon, not one reconnect attempt each */
+				while (!mEvents.isEmpty() && mEvents.getFirst() == connected)
+				{
+					mEvents.removeFirst();
+				}
 			}
 			/* call the native parts without holding the lock */
 			networkChanged(!connected);

src/frontends/android/app/src/main/java/org/strongswan/android/logic/PauseManager.kt

@@ -229,6 +229,32 @@ object PauseManager
 		alarmManager(ctx).cancel(alarmIntent(ctx))
 	}
 
+	/**
+	 * After a reboot: alarms do not survive it, so a pause that was running would
+	 * never end.  Re-arms the alarm, or ends the pause right away if its time is up.
+	 */
+	@JvmStatic
+	fun rearmAfterRestart(context: Context)
+	{
+		val ctx = context.applicationContext
+		val prefs = PreferenceManager.getDefaultSharedPreferences(ctx)
+		val until = prefs.getLong(PREF_UNTIL, 0L)
+		val profile = prefs.getString(PREF_PROFILE, null)
+		if (profile == null || until == 0L)
+		{
+			return
+		}
+		if (until > System.currentTimeMillis())
+		{
+			DiagLog.i(TAG, "pause survives the restart, re-arming its alarm")
+			store(ctx, until, profile)
+		}
+		else
+		{
+			onAlarm(ctx)
+		}
+	}
+
 	private fun store(ctx: Context, until: Long, profileUuid: String)
 	{
 		PreferenceManager.getDefaultSharedPreferences(ctx).edit()

src/frontends/android/app/src/main/java/org/strongswan/android/logic/ScheduledJobQueue.kt

@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2026 SHX VPN
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+package org.strongswan.android.logic
+
+import java.util.PriorityQueue
+
+/**
+ * The job queue behind [Scheduler]: charon's timers, ordered by due time, and the
+ * bookkeeping of the single alarm that wakes the device for the earliest one.
+ * Times are on any monotonic clock (the scheduler passes elapsedRealtime).
+ *
+ * Jobs due within [coalesceMs] of each other share one alarm: a job may run up to
+ * [coalesceMs] early, never late.  charon only schedules jobs longer than 3 s ahead,
+ * so 2 s is harmless, and every alarm saved is one more slot in the Doze quota of
+ * allow-while-idle alarms that the keepalive needs.
+ *
+ * Not thread-safe; the caller synchronises.
+ */
+class ScheduledJobQueue(private val coalesceMs: Long = COALESCE_MS)
+{
+	private class Job(val id: String, val time: Long) : Comparable<Job>
+	{
+		override fun compareTo(other: Job): Int = time.compareTo(other.time)
+	}
+
+	private val jobs = PriorityQueue<Job>()
+	private var armed = NONE
+
+	/** Due time the alarm is currently set for, or [NONE]. */
+	val armedAt: Long get() = armed
+
+	val size: Int get() = jobs.size
+
+	/**
+	 * Queues a job.
+	 *
+	 * @return true if the alarm has to be (re)armed for [nextAlarm]; false if the
+	 * armed alarm already covers the job
+	 */
+	fun add(id: String, time: Long): Boolean
+	{
+		jobs.add(Job(id, time))
+		if (armed == NONE || time < armed - coalesceMs)
+		{
+			armed = time
+			return true
+		}
+		return false
+	}
+
+	/**
+	 * Removes the jobs that are due at [now] (or within the coalescing window).
+	 * The alarm is considered fired: [nextAlarm] says whether to arm another one.
+	 */
+	fun popDue(now: Long): List<String>
+	{
+		val limit = now + coalesceMs
+		val due = ArrayList<String>()
+		while (true)
+		{
+			val head = jobs.peek() ?: break
+			if (head.time > limit)
+			{
+				break
+			}
+			due.add(jobs.remove().id)
+		}
+		armed = jobs.peek()?.time ?: NONE
+		return due
+	}
+
+	/** Due time of the earliest queued job, or [NONE]; the time to arm after [popDue]. */
+	fun nextAlarm(): Long = jobs.peek()?.time ?: NONE
+
+	fun clear()
+	{
+		jobs.clear()
+		armed = NONE
+	}
+
+	companion object
+	{
+		const val NONE = -1L
+		const val COALESCE_MS = 2000L
+	}
+}

src/frontends/android/app/src/main/java/org/strongswan/android/logic/Scheduler.java

@@ -24,10 +24,10 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.Build;
+import android.os.SystemClock;
 import android.util.Log;
 
-import java.util.ArrayList;
+import java.util.List;
-import java.util.PriorityQueue;
 import java.util.UUID;
 
 import androidx.annotation.RequiresApi;
@@ -38,14 +38,18 @@ public class Scheduler extends BroadcastReceiver
 	private final String TAG = Scheduler.class.getSimpleName();
 	private final Context mContext;
 	private final AlarmManager mManager;
-	private final PriorityQueue<ScheduledJob> mJobs;
+	/* due times are elapsedRealtime: unlike RTC they do not jump when the clock
+	 * is set (NTP, manual change, time zone), which would delay keepalives and
+	 * rekeyings by hours */
+	private final ScheduledJobQueue mJobs;
+	private boolean mExactLogged;
 
 	@SuppressLint("UnspecifiedRegisterReceiverFlag")
 	public Scheduler(Context context)
 	{
 		mContext = context;
 		mManager = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
-		mJobs = new PriorityQueue<>();
+		mJobs = new ScheduledJobQueue(ScheduledJobQueue.COALESCE_MS);
 
 		IntentFilter filter = new IntentFilter();
 		filter.addAction(EXECUTE_JOB);
@@ -108,7 +112,7 @@ public class Scheduler extends BroadcastReceiver
 	 * alarms instead of crashing with a SecurityException (connectivity then
 	 * only degrades slightly while timers may be delayed in doze mode).
 	 *
-	 * @param time wakeup time based on RTC
+	 * @param time wakeup time based on elapsedRealtime
 	 */
 	@RequiresApi(api = Build.VERSION_CODES.M)
 	private void scheduleAlarm(long time)
@@ -119,21 +123,26 @@ public class Scheduler extends BroadcastReceiver
 		{
 			exact = mManager.canScheduleExactAlarms();
 		}
+		if (!mExactLogged)
+		{	/* once per run, for support reports */
+			mExactLogged = true;
+			DiagLog.i(TAG, "keepalive alarms are " + (exact ? "exact" : "inexact (exact alarms not allowed)"));
+		}
 		try
 		{
 			if (exact)
 			{
-				mManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, time, pending);
+				mManager.setExactAndAllowWhileIdle(AlarmManager.ELAPSED_REALTIME_WAKEUP, time, pending);
 			}
 			else
 			{
-				mManager.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, time, pending);
+				mManager.setAndAllowWhileIdle(AlarmManager.ELAPSED_REALTIME_WAKEUP, time, pending);
 			}
 		}
 		catch (SecurityException e)
 		{	/* permission might have been revoked, or OEM restrictions apply */
 			Log.w(TAG, "Falling back to inexact alarm after SecurityException");
-			mManager.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, time, pending);
+			mManager.setAndAllowWhileIdle(AlarmManager.ELAPSED_REALTIME_WAKEUP, time, pending);
 		}
 	}
 
@@ -149,12 +158,10 @@ public class Scheduler extends BroadcastReceiver
 	{
 		synchronized (this)
 		{
-			ScheduledJob job = new ScheduledJob(id, System.currentTimeMillis() + ms);
+			long time = SystemClock.elapsedRealtime() + ms;
-			mJobs.add(job);
+			if (mJobs.add(id, time))
-
+			{	/* the job is due before the armed alarm: move the alarm */
-			if (job == mJobs.peek())
+				scheduleAlarm(time);
-			{	/* update the alarm if the job has to be executed before all others */
-				scheduleAlarm(job.Time);
 			}
 		}
 	}
@@ -163,30 +170,21 @@ public class Scheduler extends BroadcastReceiver
 	@Override
 	public void onReceive(Context context, Intent intent)
 	{
-		ArrayList<ScheduledJob> jobs = new ArrayList<>();
+		List<String> jobs;
-		long now = System.currentTimeMillis();
 
 		synchronized (this)
 		{
-			ScheduledJob job = mJobs.peek();
+			jobs = mJobs.popDue(SystemClock.elapsedRealtime());
-			while (job != null)
+			long next = mJobs.nextAlarm();
+			if (next != ScheduledJobQueue.NONE)
 			{
-				if (job.Time > now)
+				scheduleAlarm(next);
-				{
-					break;
-				}
-				jobs.add(mJobs.remove());
-				job = mJobs.peek();
-			}
-			if (job != null)
-			{
-				scheduleAlarm(job.Time);
 			}
 		}
 
-		for (ScheduledJob job : jobs)
+		for (String id : jobs)
 		{
-			executeJob(job.Id);
+			executeJob(id);
 		}
 	}
 
@@ -196,25 +194,4 @@ public class Scheduler extends BroadcastReceiver
 	 * @param id job ID
 	 */
 	public native void executeJob(String id);
-
-	/**
-	 * Keep track of scheduled jobs.
-	 */
-	private static class ScheduledJob implements Comparable<ScheduledJob>
-	{
-		String Id;
-		long Time;
-
-		ScheduledJob(String id, long time)
-		{
-			Id = id;
-			Time = time;
-		}
-
-		@Override
-		public int compareTo(ScheduledJob o)
-		{
-			return Long.compare(Time, o.Time);
-		}
-	}
 }

src/frontends/android/app/src/main/java/org/strongswan/android/logic/WatchdogReceiver.java

@@ -232,6 +232,7 @@ public class WatchdogReceiver extends BroadcastReceiver
 				return;
 			case RESTART:
 			{
+				boolean autoRestart = uuid == null;
 				if (uuid == null)
 				{
 					uuid = resolveAutoProfile(context, prefs);
@@ -260,6 +261,10 @@ public class WatchdogReceiver extends BroadcastReceiver
 				 * once, which is harmless (retry flag set, same profile). */
 				Log.i(TAG, "A connection was expected but the VPN process is gone, restarting it");
 				DiagLog.i(TAG, "restarting the VPN process");
+				if (autoRestart)
+				{	/* this process does not remember the session was auto-started */
+					AutoConnectManager.getInstance(context).markAutoSessionRestored();
+				}
 				Intent start = new Intent(context, CharonVpnService.class);
 				start.putExtra(VpnProfileDataSource.KEY_UUID, uuid);
 				start.putExtra(CharonVpnService.KEY_IS_RETRY, true);

src/frontends/android/app/src/main/java/org/strongswan/android/logic/autoconnect/AutoConnectManager.kt

@@ -91,6 +91,8 @@ class AutoConnectManager private constructor(
 	private var currentNetwork: NetworkKind? = null
 	/* marks the session this manager started itself */
 	private val autoSession = AtomicBoolean(false)
+	/* an auto session was restored by the watchdog and its tunnel is not up yet */
+	@Volatile private var awaitingRestoredTunnel = false
 	/* elapsedRealtime of the last park caused by a trusted Wi-Fi (flap guard) */
 	private var lastParkAt = 0L
 
@@ -123,10 +125,28 @@ class AutoConnectManager private constructor(
 		}
 	}
 
+	/** Network scenarios need the network events even when the network rules are off. */
+	private fun scenariosNeedNetwork(): Boolean =
+		org.strongswan.android.logic.scenarios.ScenarioEngine.needsNetworkEvents(context)
+
+	/** Called when the scenarios changed: starts or stops the network listening to fit. */
+	fun scenariosChanged()
+	{
+		config = loadConfig()
+		if (config.enabled || scenariosNeedNetwork())
+		{
+			start()
+		}
+		else
+		{
+			stop()
+		}
+	}
+
 	fun start()
 	{
 		config = loadConfig()
-		if (!config.enabled)
+		if (!config.enabled && !scenariosNeedNetwork())
 		{
 			return
 		}
@@ -186,8 +206,8 @@ class AutoConnectManager private constructor(
 		}
 		else
 		{
-			stop()
 			autoSession.set(false)
+			scenariosChanged()
 		}
 	}
 
@@ -214,8 +234,8 @@ class AutoConnectManager private constructor(
 		}
 		else
 		{
-			stop()
 			autoSession.set(false)
+			scenariosChanged()
 		}
 	}
 
@@ -236,12 +256,28 @@ class AutoConnectManager private constructor(
 	override fun stateChanged()
 	{
 		val state = service?.state ?: return
-		if (state == VpnStateService.State.DISABLED)
+		if (state != VpnStateService.State.DISABLED)
+		{
+			awaitingRestoredTunnel = false
+		}
+		else if (!awaitingRestoredTunnel)
 		{
 			autoSession.set(false)
 		}
 	}
 
+	/**
+	 * The watchdog brought an auto session back in a fresh process, whose memory
+	 * knows nothing of it.  Mark it as auto-started again, so it parks on a trusted
+	 * Wi-Fi instead of running all night; the DISABLED state of the not yet
+	 * started service must not clear the mark.
+	 */
+	fun markAutoSessionRestored()
+	{
+		awaitingRestoredTunnel = true
+		autoSession.set(true)
+	}
+
 	/**
 	 * Pure decision function, unit-testable.
 	 */
@@ -268,8 +304,8 @@ class AutoConnectManager private constructor(
 
 	private fun evaluate()
 	{
-		if (!running.get())
+		if (!running.get() || !config.enabled)
-		{
+		{	/* running only for the scenarios: they decide, not the network rules */
 			return
 		}
 		val svc = service ?: return

src/frontends/android/app/src/main/java/org/strongswan/android/logic/scenarios/Scenarios.kt

@@ -25,10 +25,12 @@ import android.content.IntentFilter
 import android.net.ConnectivityManager
 import android.net.NetworkCapabilities
 import android.net.VpnService
+import android.os.Build
 import android.os.Bundle
 import android.os.Handler
 import android.os.Looper
 import android.os.PowerManager
+import android.os.SystemClock
 import android.telephony.TelephonyManager
 import android.util.Log
 import androidx.preference.PreferenceManager
@@ -162,6 +164,9 @@ object ScenarioEngine
 	private const val TAG = "Scenarios"
 	private const val FILE_NAME = "scenarios.json"
 	private const val POLL_MS = 4000L
+	/* how long a broadcast waits for the VPN state service of a fresh process */
+	private const val SERVICE_WAIT_MS = 8000L
+	private const val SERVICE_POLL_MS = 200L
 	/* the foreground app did not change for a minute: poll half as often */
 	private const val SLOW_AFTER_POLLS = 15
 	private const val SLOW_POLL_MS = 8000L
@@ -193,9 +198,20 @@ object ScenarioEngine
 		_list.value = list
 		persist(context)
 		start(context)
+		org.strongswan.android.logic.autoconnect.AutoConnectManager.getInstance(context).scenariosChanged()
 		evaluate(context)
 	}
 
+	/** Whether an enabled scenario reacts to Wi-Fi, mobile network or roaming changes. */
+	@JvmStatic
+	fun needsNetworkEvents(context: Context): Boolean
+	{
+		load(context.applicationContext)
+		return _list.value.any {
+			it.enabled && (it.trigger == ScenarioTrigger.WIFI || it.trigger == ScenarioTrigger.MOBILE || it.trigger == ScenarioTrigger.ROAMING)
+		}
+	}
+
 	/** Starts listening (from the application); idempotent. */
 	@JvmStatic
 	fun start(context: Context)
@@ -289,6 +305,39 @@ object ScenarioEngine
 		}
 	}
 
+	/**
+	 * Decides again once the VPN state service exists.  A broadcast that starts a
+	 * fresh process arrives before the managers bound the service; evaluating
+	 * then would silently drop the event.  Gives up after [SERVICE_WAIT_MS]
+	 * (the next network or alarm event evaluates again) and always calls [done].
+	 */
+	@JvmStatic
+	fun evaluateWhenReady(context: Context, done: Runnable?)
+	{
+		val app = context.applicationContext
+		val deadline = SystemClock.elapsedRealtime() + SERVICE_WAIT_MS
+		val check = object : Runnable
+		{
+			override fun run()
+			{
+				if (VpnStateService.getLiveInstance() == null && SystemClock.elapsedRealtime() < deadline)
+				{
+					handler.postDelayed(this, SERVICE_POLL_MS)
+					return
+				}
+				try
+				{
+					evaluate(app)
+				}
+				finally
+				{
+					done?.run()
+				}
+			}
+		}
+		handler.post(check)
+	}
+
 	/** Network, whitelist or alarm: decide again. */
 	@JvmStatic
 	fun evaluate(context: Context)
@@ -431,10 +480,12 @@ object ScenarioEngine
 		{
 			return
 		}
+		/* without a live service nothing can be put back: keep the record so the
+		 * next evaluation (the receiver waits for the service) still restores */
+		val service = VpnStateService.getLiveInstance() ?: return
 		val wasOn = prefs.getBoolean(PREF_WAS_ON, false)
 		val wasProfile = prefs.getString(PREF_WAS_PROFILE, null)
 		prefs.edit().remove(PREF_APPLIED).remove(PREF_WAS_ON).remove(PREF_WAS_PROFILE).apply()
-		val service = VpnStateService.getLiveInstance() ?: return
 		DiagLog.i(TAG, "scenario over, restoring (on=$wasOn)")
 		if (PauseManager.isPaused(context))
 		{
@@ -562,12 +613,22 @@ object ScenarioEngine
 		{
 			c.add(Calendar.DAY_OF_YEAR, 1)
 		}
+		/* same choice as PauseManager: exact when the grant allows it */
+		val exact = Build.VERSION.SDK_INT < Build.VERSION_CODES.S || am.canScheduleExactAlarms()
 		try
 		{
-			am.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, c.timeInMillis, pi)
+			if (exact)
+			{
+				am.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, c.timeInMillis, pi)
+			}
+			else
+			{
+				am.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, c.timeInMillis, pi)
+			}
 		}
 		catch (_: SecurityException)
-		{
+		{	/* revoked in between: an inexact alarm is still better than none */
+			runCatching { am.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, c.timeInMillis, pi) }
 		}
 	}
 
@@ -673,6 +734,7 @@ class ScenarioReceiver : BroadcastReceiver()
 	override fun onReceive(context: Context, intent: Intent?)
 	{
 		ScenarioEngine.start(context)
-		ScenarioEngine.evaluate(context)
+		val pending = goAsync()
+		ScenarioEngine.evaluateWhenReady(context) { pending.finish() }
 	}
 }

src/frontends/android/app/src/main/java/org/strongswan/android/logic/stats/TrafficHistory.kt

@@ -15,6 +15,8 @@
 package org.strongswan.android.logic.stats
 
 import android.content.Context
+import android.os.PowerManager
+import android.os.SystemClock
 import android.util.Log
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
@@ -37,7 +39,8 @@ data class DayTraffic(val day: String, val vpn: Long, val direct: Long)
 
 /**
  * Daily traffic history (F_Stats).  While the tunnel is up the daemon
- * counters are sampled every [SAMPLE_S] seconds and the growth is added to
+ * counters are sampled every [SAMPLE_S] seconds (every [SAMPLE_OFF_S] with
+ * the screen off: the counters are cumulative, so nothing is lost) and the growth is added to
  * the current day; the counters restart with every connection, so a drop
  * starts a new baseline.  Kept for [KEEP_DAYS] days in traffic.json.
  */
@@ -46,12 +49,21 @@ object TrafficHistory
 	private const val TAG = "TrafficHistory"
 	private const val FILE_NAME = "traffic.json"
 	private const val SAMPLE_S = 15L
+	private const val SAMPLE_OFF_S = 60L
+	/* the history lives in memory and is written out this often (not on every
+	 * sample: a full JSON rewrite every 15 s is flash wear for nothing); a
+	 * killed process loses at most this much of the statistics */
+	internal const val SAVE_EVERY_MS = 5 * 60 * 1000L
 	private const val KEEP_DAYS = 120
 
 	private val executor = Executors.newSingleThreadScheduledExecutor()
 	private var task: ScheduledFuture<*>? = null
 	private var lastVpn = -1L
 	private var lastDirect = -1L
+	private var lastSampleAt = 0L
+	private var dirty = false
+	private var lastSavedAt = 0L
+	private var lastSavedDay: String? = null
 	@Volatile private var loaded = false
 	private val days = LinkedHashMap<String, LongArray>()
 	private var firstDay: String? = null
@@ -86,11 +98,38 @@ object TrafficHistory
 		val running = task ?: return
 		running.cancel(false)
 		task = null
-		executor.execute { sample(app) }
+		executor.execute {
+			sample(app, force = true)
+			flush(app)
+		}
 	}
 
-	private fun sample(context: Context)
+	/** Writes the history out now if it changed since the last write. */
+	@Synchronized
+	fun flush(context: Context)
 	{
+		if (dirty)
+		{
+			save(context)
+		}
+	}
+
+	/** Whether a changed history has to be written now: periodically and when the day turns. */
+	internal fun saveDue(dirty: Boolean, now: Long, lastSavedAt: Long, dayChanged: Boolean): Boolean =
+		dirty && (dayChanged || now - lastSavedAt >= SAVE_EVERY_MS)
+
+	private fun screenOn(context: Context): Boolean =
+		(context.getSystemService(Context.POWER_SERVICE) as? PowerManager)?.isInteractive != false
+
+	private fun sample(context: Context, force: Boolean = false)
+	{
+		val now = SystemClock.elapsedRealtime()
+		val screen = screenOn(context)
+		if (!force && !screen && now - lastSampleAt < SAMPLE_OFF_S * 1000L - 1000L)
+		{	/* screen off: a sample a minute is enough, the counters accumulate */
+			return
+		}
+		lastSampleAt = now
 		val traffic = runCatching { CharonVpnService.queryTraffic() }.getOrNull()
 		val vpn = traffic?.let { it.getOrElse(0) { 0L } + it.getOrElse(1) { 0L } } ?: return
 		/* direct bytes only exist with the userspace router (s[3]) */
@@ -121,9 +160,16 @@ object TrafficHistory
 			firstDay = key
 		}
 		prune()
-		save(context)
+		dirty = true
+		if (saveDue(dirty, SystemClock.elapsedRealtime(), lastSavedAt, lastSavedDay != null && lastSavedDay != key))
+		{
+			save(context)
+		}
 		_changes.value = System.currentTimeMillis()
-		org.strongswan.android.ui.widget.ShxWidgetState.refresh(context)
+		if (screenOn(context))
+		{	/* nobody sees the widget with the screen off */
+			org.strongswan.android.ui.widget.ShxWidgetState.refresh(context)
+		}
 	}
 
 	/** The days from [from] to [to] (inclusive, wall clock), zeros where nothing was recorded. */
@@ -205,6 +251,9 @@ object TrafficHistory
 				file.writeText(json.toString())
 				tmp.delete()
 			}
+			dirty = false
+			lastSavedAt = SystemClock.elapsedRealtime()
+			lastSavedDay = dayKey(System.currentTimeMillis())
 		}
 		catch (e: Exception)
 		{

src/frontends/android/app/src/main/jni/libandroidbridge/routing/direct_engine.c

@@ -797,10 +797,9 @@ static void *engine_thread(private_direct_engine_t *this)
 		{
 			active = TRUE;
 			this->udp->reprotect(this->udp);
-			if (this->tcp_active)
+			/* also while lwIP is dormant: this clears the negative cache of
-			{
+			 * failed direct connects, which must not survive a roam */
-				this->tcp->reprotect(this->tcp);
+			this->tcp->reprotect(this->tcp);
-			}
 			/* the network changed: whatever was dead for direct connects
 			 * may work again - drop the tunnel fallbacks with the rest of
 			 * the failure state (tcp->reprotect clears the neg table) */
@@ -812,8 +811,22 @@ static void *engine_thread(private_direct_engine_t *this)
 		this->bind_lock->unlock(this->bind_lock);
 
 		if (!bound && this->unbound_flushed)
-		{	/* TUN still gone and already flushed */
+		{	/* TUN still gone and already flushed: nothing to do until the
+			 * re-bind wakes us, so back off like an idle round instead of
+			 * polling at the active cadence all through a re-authentication */
 			drain_queue_nobind(this);
+			if (active)
+			{
+				poll_ms = ENGINE_POLL_MS;
+			}
+			else
+			{
+				poll_ms *= 2;
+				if (poll_ms > ENGINE_IDLE_POLL_MS)
+				{
+					poll_ms = ENGINE_IDLE_POLL_MS;
+				}
+			}
 			continue;
 		}
 
@@ -862,6 +875,12 @@ static void *engine_thread(private_direct_engine_t *this)
 		{
 			this->tcp->process_poll(this->tcp, fds + 1 + udp_n, tcp_n);
 			this->tcp->check_timers(this->tcp);
+			if (!active && this->tcp->flow_count(this->tcp) == 0)
+			{	/* a full idle round with no TCP flow left: let lwIP go dormant
+				 * again (the next TCP packet wakes it, its timers catch up),
+				 * so the idle cadence stretches back to ENGINE_IDLE_POLL_MS */
+				this->tcp_active = FALSE;
+			}
 		}
 
 		{	/* adapt the cadence after the work of this round is known */

src/frontends/android/app/src/main/jni/libandroidbridge/routing/direct_tcp.c

@@ -966,6 +966,12 @@ METHOD(direct_tcp_t, check_timers, void,
 	enumerator->destroy(enumerator);
 }
 
+METHOD(direct_tcp_t, flow_count, size_t,
+	private_direct_tcp_t *this)
+{
+	return this->relays->get_count(this->relays);
+}
+
 METHOD(direct_tcp_t, set_mtu, void,
 	private_direct_tcp_t *this, uint16_t mtu)
 {
@@ -1290,6 +1296,7 @@ direct_tcp_t *direct_tcp_create(uint16_t mtu, direct_engine_t *engine,
 		.public = {
 			.handle_packet = _handle_packet,
 			.check_timers = _check_timers,
+			.flow_count = _flow_count,
 			.set_mtu = _set_mtu,
 			.reprotect = _reprotect,
 			.fill_poll = _fill_poll,

src/frontends/android/app/src/test/java/org/strongswan/android/logic/ScheduledJobQueueTest.kt

@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2026 SHX VPN
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+package org.strongswan.android.logic
+
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.Test
+
+class ScheduledJobQueueTest
+{
+	@Test
+	fun firstJobArmsTheAlarm()
+	{
+		val q = ScheduledJobQueue(2000)
+		assertThat(q.add("a", 10_000)).isTrue()
+		assertThat(q.armedAt).isEqualTo(10_000)
+	}
+
+	@Test
+	fun laterJobDoesNotRearm()
+	{
+		val q = ScheduledJobQueue(2000)
+		q.add("a", 10_000)
+		assertThat(q.add("b", 50_000)).isFalse()
+		assertThat(q.armedAt).isEqualTo(10_000)
+	}
+
+	@Test
+	fun jobJustBeforeTheArmedAlarmReusesIt()
+	{
+		val q = ScheduledJobQueue(2000)
+		q.add("a", 10_000)
+		assertThat(q.add("b", 8_500)).isFalse()
+		assertThat(q.armedAt).isEqualTo(10_000)
+	}
+
+	@Test
+	fun clearlyEarlierJobRearms()
+	{
+		val q = ScheduledJobQueue(2000)
+		q.add("a", 10_000)
+		assertThat(q.add("b", 5_000)).isTrue()
+		assertThat(q.armedAt).isEqualTo(5_000)
+	}
+
+	@Test
+	fun popDueRunsJobsInOrderIncludingTheCoalescingWindow()
+	{
+		val q = ScheduledJobQueue(2000)
+		q.add("c", 11_900)
+		q.add("a", 10_000)
+		q.add("b", 10_500)
+		q.add("late", 30_000)
+		assertThat(q.popDue(10_000)).containsExactly("a", "b", "c")
+		assertThat(q.nextAlarm()).isEqualTo(30_000)
+		assertThat(q.armedAt).isEqualTo(30_000)
+	}
+
+	@Test
+	fun earlyOrSpuriousWakeupKeepsTheQueue()
+	{
+		val q = ScheduledJobQueue(2000)
+		q.add("a", 10_000)
+		assertThat(q.popDue(5_000)).isEmpty()
+		assertThat(q.nextAlarm()).isEqualTo(10_000)
+		assertThat(q.armedAt).isEqualTo(10_000)
+	}
+
+	@Test
+	fun emptyQueueLeavesNothingArmed()
+	{
+		val q = ScheduledJobQueue(2000)
+		q.add("a", 10_000)
+		assertThat(q.popDue(10_000)).containsExactly("a")
+		assertThat(q.nextAlarm()).isEqualTo(ScheduledJobQueue.NONE)
+		assertThat(q.armedAt).isEqualTo(ScheduledJobQueue.NONE)
+		assertThat(q.add("b", 20_000)).isTrue()
+	}
+
+	@Test
+	fun clearForgetsTheArmedAlarm()
+	{
+		val q = ScheduledJobQueue(2000)
+		q.add("a", 10_000)
+		q.clear()
+		assertThat(q.size).isEqualTo(0)
+		assertThat(q.add("b", 40_000)).isTrue()
+	}
+}

src/frontends/android/app/src/test/java/org/strongswan/android/logic/TrafficHistoryTest.kt

@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2026 SHX VPN
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+package org.strongswan.android.logic
+
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.Test
+import org.strongswan.android.logic.stats.TrafficHistory
+
+class TrafficHistoryTest
+{
+	private val every = TrafficHistory.SAVE_EVERY_MS
+
+	@Test
+	fun cleanHistoryIsNeverWritten()
+	{
+		assertThat(TrafficHistory.saveDue(false, 10 * every, 0, true)).isFalse()
+	}
+
+	@Test
+	fun changedHistoryWaitsForTheInterval()
+	{
+		assertThat(TrafficHistory.saveDue(true, every - 1, 0, false)).isFalse()
+		assertThat(TrafficHistory.saveDue(true, every, 0, false)).isTrue()
+	}
+
+	@Test
+	fun dayChangeWritesAtOnce()
+	{
+		assertThat(TrafficHistory.saveDue(true, 1000, 900, true)).isTrue()
+	}
+}

src/frontends/android/docs/energy-plan.md

@@ -139,3 +139,38 @@
 - minSdk 24: `setExactAndAllowWhileIdle` и ограничения точных будильников (Android 12+/13+) уже учтены в `Scheduler` и `WatchdogReceiver`; не ломать.
 - Релиз — по процедуре из `docs/README.md` (smoke на AVD `shx36`, выгрузка в S3 только с подтверждения).
 - Строки UI, если появятся (подсказки в «Батарее»), добавлять сразу во все семь `strings.xml`.
+
+## 7. Версия 2.19.0: надёжность и лишняя работа (по результатам разбора багов)
+
+**Стабильность соединения**
+- `Scheduler` (будильники keepalive и rekey): `ELAPSED_REALTIME_WAKEUP` вместо `RTC_WAKEUP` — сдвиг часов (NTP, ручная смена, пояс)
+  больше не уводит срабатывание на часы вперёд. Очередь вынесена в `ScheduledJobQueue` (тесты): задания в окне 2 с делят один будильник
+  (раньше срабатывает не более чем на 2 с, поздно — никогда; charon ставит задания дольше 3 с). Каждый сэкономленный будильник — слот в квоте
+  allow-while-idle в Doze. Интервалы и keepalive 45 с не менялись. В `diag.log` один раз пишется, точные ли будильники.
+- `BootReceiver` (`BOOT_COMPLETED`, `TIME_SET`, `TIMEZONE_CHANGED`): после перезагрузки и смены времени заново взводит будильник пауз
+  (раньше пауза после перезагрузки не заканчивалась никогда) и будильник окон сценариев, правила решают заново. Туннель сам не стартует;
+  профиль без сохранённого пароля по-прежнему не запускается.
+- `ScenarioReceiver` ждёт привязки `VpnStateService` (до 8 с) через `goAsync`; раньше срабатывание свежего процесса терялось. `restoreIfApplied`
+  стирает запись о применённом сценарии только когда сервис есть.
+- Будильник окон сценариев: точный, если разрешено (как у паузы).
+- Сетевые сценарии (Wi-Fi, мобильная сеть, роуминг) слушают сеть и без включённых правил сетей (`AutoConnectManager.scenariosChanged`).
+- Watchdog, поднявший туннель авто-сессии в свежем процессе, помечает сессию авто (`markAutoSessionRestored`): туннель паркуется на доверенной
+  Wi-Fi, а не работает всю ночь. Постоянный флаг не вводился сознательно: устаревший флаг запарковал бы туннель, запущенный вручную.
+- `NetworkManager`: набор сетей вместо счётчика (повтор `onAvailable` или пропуск `onLost` не сдвигают состояние); подряд идущие одинаковые
+  события схлопываются в одно.
+
+**Расход ресурсов**
+- `direct_engine.c`: `tcp_active` сбрасывается после холостого раунда без TCP-потоков (`flow_count` в `direct_tcp.c` объявлен, но не был
+  реализован — теперь реализован), холостой интервал снова растягивается до 4 с; ветка «TUN не привязан» наращивает интервал, а не опрашивает
+  4 раза в секунду; `reprotect` очищает отрицательный кэш и при спящем lwIP.
+- `TrafficHistory`: история в памяти, на диск раз в 5 мин, при остановке и смене дня; с погашенным экраном опрос раз в минуту; виджет обновляется
+  только при включённом экране. Теряется не более 5 мин статистики при убийстве процесса.
+
+**Сознательно не делали (нет выигрыша или он не стоит риска)**
+- Проверка здоровья уже растягивает паузы до штатного интервала и выключена по умолчанию, отдельная «остановка на мёртвом туннеле» не нужна.
+- Проверка белых списков: цепочка идёт только пока белый список обнаружен, шаг не больше 5 мин; удлинение при погашенном экране отложило бы
+  возврат туннеля на минуты ради долей процента.
+- Сеть без процесса (`registerNetworkCallback` на `PendingIntent`) — гипотеза не проверена на устройстве.
+- `UnderlyingNetworkTracker` и SSID для сценариев из кэша `NetworkMonitor` — нужен лог с реальных сетей.
+
+**Известное ограничение:** без «Будильников и напоминаний» keepalive в глубоком Doze остаётся под квотой; склейка заданий лишь освобождает слоты.