From 9ae32bc56b02f7141b5f0de7dabf16cf81f54263 Mon Sep 17 00:00:00 2001
From: Michael Uray <25169478+MichaelUray@users.noreply.github.com>
Date: Sat, 25 Apr 2026 22:30:37 +0000
Subject: [PATCH] Add Lazy connection toggle to Advanced settings

Adds a switch in the Advanced fragment that controls the
LazyConnectionEnabled engine setting. Default is OFF so existing
behavior is preserved; users opt in to per-peer connection on first
traffic for reduced background load.

The toggle wires through the new GetLazyConnectionEnabled /
SetLazyConnectionEnabled methods on the gomobile Preferences bridge.

Tested on a Galaxy S21 (Android 15): toggling the switch persists
LazyConnectionEnabled in the config; on reconnect the engine activates
the lazy connection manager (setup lazy connection service, per-peer
activity listeners on 127.0.0.1:N, 15-minute inactivity threshold) and
peers are wired up on demand instead of eagerly.
---
 .../client/ui/advanced/AdvancedFragment.java  | 18 ++++++-
 app/src/main/res/layout/fragment_advanced.xml | 51 ++++++++++++++++++-
 app/src/main/res/values/strings.xml           |  2 +
 3 files changed, 68 insertions(+), 3 deletions(-)

diff --git a/app/src/main/java/io/netbird/client/ui/advanced/AdvancedFragment.java b/app/src/main/java/io/netbird/client/ui/advanced/AdvancedFragment.java
index 3f1e2a7c..ba968d38 100644
--- a/app/src/main/java/io/netbird/client/ui/advanced/AdvancedFragment.java
+++ b/app/src/main/java/io/netbird/client/ui/advanced/AdvancedFragment.java
@@ -197,6 +197,7 @@ private void initializeEngineConfigSwitches() {
             binding.switchDisableFirewall.setChecked(goPreferences.getDisableFirewall());
             binding.switchAllowSsh.setChecked(goPreferences.getServerSSHAllowed());
             binding.switchBlockInbound.setChecked(goPreferences.getBlockInbound());
+            binding.switchLazyConnection.setChecked(goPreferences.getLazyConnectionEnabled());
 
             // Set up change listeners
             binding.switchDisableClientRoutes.setOnCheckedChangeListener((buttonView, isChecked) -> {
@@ -252,15 +253,28 @@ private void initializeEngineConfigSwitches() {
                     Log.e(LOGTAG, "Failed to set block inbound", e);
                 }
             });
-            
+
+            binding.switchLazyConnection.setOnCheckedChangeListener((buttonView, isChecked) -> {
+                try {
+                    goPreferences.setLazyConnectionEnabled(isChecked);
+                    goPreferences.commit();
+                } catch (Exception e) {
+                    Log.e(LOGTAG, "Failed to set lazy connection", e);
+                }
+            });
+
             // Make parent layouts clickable to toggle switches (for TV remote)
             binding.layoutAllowSsh.setOnClickListener(v -> {
                 binding.switchAllowSsh.toggle();
             });
-            
+
             binding.layoutBlockInbound.setOnClickListener(v -> {
                 binding.switchBlockInbound.toggle();
             });
+
+            binding.layoutLazyConnection.setOnClickListener(v -> {
+                binding.switchLazyConnection.toggle();
+            });
             
             binding.layoutDisableClientRoutes.setOnClickListener(v -> {
                 binding.switchDisableClientRoutes.toggle();
diff --git a/app/src/main/res/layout/fragment_advanced.xml b/app/src/main/res/layout/fragment_advanced.xml
index ad46aea4..082f918e 100644
--- a/app/src/main/res/layout/fragment_advanced.xml
+++ b/app/src/main/res/layout/fragment_advanced.xml
@@ -268,7 +268,7 @@
             </LinearLayout>
 
             <LinearLayout
-                android:id="@+id/layout_disable_client_routes"
+                android:id="@+id/layout_lazy_connection"
                 android:layout_width="0dp"
                 android:layout_height="wrap_content"
                 android:layout_marginTop="16dp"
@@ -282,6 +282,55 @@
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/layout_block_inbound">
 
+                <LinearLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:gravity="center_vertical"
+                    android:orientation="horizontal">
+
+                    <TextView
+                        android:layout_width="0dp"
+                        android:layout_height="wrap_content"
+                        android:layout_weight="1"
+                        android:text="@string/advanced_lazy_connection"
+                        android:textColor="@color/nb_txt_light" />
+
+                    <com.google.android.material.switchmaterial.SwitchMaterial
+                        android:id="@+id/switch_lazy_connection"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:clickable="false"
+                        android:focusable="false" />
+
+                </LinearLayout>
+
+                <TextView
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_marginStart="0dp"
+                    android:layout_marginTop="2dp"
+                    android:layout_marginEnd="48dp"
+                    android:text="@string/advanced_lazy_connection_desc"
+                    android:textColor="@color/nb_txt_light"
+                    android:textSize="12sp" />
+
+            </LinearLayout>
+
+            <LinearLayout
+                android:id="@+id/layout_disable_client_routes"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="16dp"
+                android:background="@drawable/focus_highlight"
+                android:clickable="true"
+                android:focusable="true"
+                android:focusableInTouchMode="false"
+                android:orientation="vertical"
+                android:padding="12dp"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toBottomOf="@id/layout_lazy_connection">
+
                 <LinearLayout
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d6b1f51b..9db4f747 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -96,6 +96,8 @@
     <string name="advanced_allow_ssh_desc">Allows SSH connections to this device</string>
     <string name="advanced_block_inbound">Block inbound connections</string>
     <string name="advanced_block_inbound_desc">Blocks all inbound connections to this device and routed networks. This overrides any policies received from the management service</string>
+    <string name="advanced_lazy_connection">Lazy connection</string>
+    <string name="advanced_lazy_connection_desc">Defer per-peer connection setup until first actual traffic. Reduces background load but adds latency to the first packet to a peer</string>
 
 
     <string name="desc_logo">NetBird logo</string>