From e7f233db5b9499fdb8b7bbc779006129d0daeb38 Mon Sep 17 00:00:00 2001
From: Cody Henthorne <cody@signal.org>
Date: Wed, 3 Mar 2021 16:03:49 -0500
Subject: [PATCH] Add Device Transfer via WiFi Direct groundwork.

---
 .../java/org/signal/core/util/ThreadUtil.java |   6 +
 device-transfer/app/build.gradle              |  30 ++
 .../app/src/main/AndroidManifest.xml          |  22 +
 .../devicetransfer/app/MainActivity.java      | 152 +++++++
 .../drawable-v24/ic_launcher_foreground.xml   |  31 ++
 .../res/drawable/ic_launcher_background.xml   | 171 +++++++
 .../src/main/res/drawable/ic_refresh_20.xml   |   9 +
 .../app/src/main/res/layout/activity_main.xml |  58 +++
 .../res/mipmap-anydpi-v26/ic_launcher.xml     |   6 +
 .../mipmap-anydpi-v26/ic_launcher_round.xml   |   6 +
 .../src/main/res/mipmap-hdpi/ic_launcher.png  | Bin 0 -> 3593 bytes
 .../res/mipmap-hdpi/ic_launcher_round.png     | Bin 0 -> 5339 bytes
 .../src/main/res/mipmap-mdpi/ic_launcher.png  | Bin 0 -> 2636 bytes
 .../res/mipmap-mdpi/ic_launcher_round.png     | Bin 0 -> 3388 bytes
 .../src/main/res/mipmap-xhdpi/ic_launcher.png | Bin 0 -> 4926 bytes
 .../res/mipmap-xhdpi/ic_launcher_round.png    | Bin 0 -> 7472 bytes
 .../main/res/mipmap-xxhdpi/ic_launcher.png    | Bin 0 -> 7909 bytes
 .../res/mipmap-xxhdpi/ic_launcher_round.png   | Bin 0 -> 11873 bytes
 .../main/res/mipmap-xxxhdpi/ic_launcher.png   | Bin 0 -> 10652 bytes
 .../res/mipmap-xxxhdpi/ic_launcher_round.png  | Bin 0 -> 16570 bytes
 .../app/src/main/res/values-night/themes.xml  |  16 +
 .../app/src/main/res/values/colors.xml        |  10 +
 .../app/src/main/res/values/strings.xml       |   3 +
 .../app/src/main/res/values/themes.xml        |  16 +
 device-transfer/lib/build.gradle              |  30 ++
 .../lib/src/main/AndroidManifest.xml          |  20 +
 .../org/signal/devicetransfer/ClientTask.java |  22 +
 .../DeviceToDeviceTransferService.java        | 248 +++++++++++
 .../devicetransfer/DeviceTransferClient.java  | 339 ++++++++++++++
 .../devicetransfer/DeviceTransferServer.java  | 290 ++++++++++++
 .../org/signal/devicetransfer/IpExchange.java | 148 +++++++
 .../org/signal/devicetransfer/ServerTask.java |  22 +
 .../devicetransfer/ShutdownCallback.java      |  10 +
 .../signal/devicetransfer/TransferMode.java   |  12 +
 .../org/signal/devicetransfer/WifiDirect.java | 416 ++++++++++++++++++
 .../WifiDirectUnavailableException.java       |  29 ++
 .../lib/witness-verifications.gradle          | 105 +++++
 settings.gradle                               |   5 +
 38 files changed, 2232 insertions(+)
 create mode 100644 device-transfer/app/build.gradle
 create mode 100644 device-transfer/app/src/main/AndroidManifest.xml
 create mode 100644 device-transfer/app/src/main/java/org/signal/devicetransfer/app/MainActivity.java
 create mode 100644 device-transfer/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
 create mode 100644 device-transfer/app/src/main/res/drawable/ic_launcher_background.xml
 create mode 100644 device-transfer/app/src/main/res/drawable/ic_refresh_20.xml
 create mode 100644 device-transfer/app/src/main/res/layout/activity_main.xml
 create mode 100644 device-transfer/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
 create mode 100644 device-transfer/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
 create mode 100644 device-transfer/app/src/main/res/mipmap-hdpi/ic_launcher.png
 create mode 100644 device-transfer/app/src/main/res/mipmap-hdpi/ic_launcher_round.png
 create mode 100644 device-transfer/app/src/main/res/mipmap-mdpi/ic_launcher.png
 create mode 100644 device-transfer/app/src/main/res/mipmap-mdpi/ic_launcher_round.png
 create mode 100644 device-transfer/app/src/main/res/mipmap-xhdpi/ic_launcher.png
 create mode 100644 device-transfer/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png
 create mode 100644 device-transfer/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
 create mode 100644 device-transfer/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
 create mode 100644 device-transfer/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
 create mode 100644 device-transfer/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
 create mode 100644 device-transfer/app/src/main/res/values-night/themes.xml
 create mode 100644 device-transfer/app/src/main/res/values/colors.xml
 create mode 100644 device-transfer/app/src/main/res/values/strings.xml
 create mode 100644 device-transfer/app/src/main/res/values/themes.xml
 create mode 100644 device-transfer/lib/build.gradle
 create mode 100644 device-transfer/lib/src/main/AndroidManifest.xml
 create mode 100644 device-transfer/lib/src/main/java/org/signal/devicetransfer/ClientTask.java
 create mode 100644 device-transfer/lib/src/main/java/org/signal/devicetransfer/DeviceToDeviceTransferService.java
 create mode 100644 device-transfer/lib/src/main/java/org/signal/devicetransfer/DeviceTransferClient.java
 create mode 100644 device-transfer/lib/src/main/java/org/signal/devicetransfer/DeviceTransferServer.java
 create mode 100644 device-transfer/lib/src/main/java/org/signal/devicetransfer/IpExchange.java
 create mode 100644 device-transfer/lib/src/main/java/org/signal/devicetransfer/ServerTask.java
 create mode 100644 device-transfer/lib/src/main/java/org/signal/devicetransfer/ShutdownCallback.java
 create mode 100644 device-transfer/lib/src/main/java/org/signal/devicetransfer/TransferMode.java
 create mode 100644 device-transfer/lib/src/main/java/org/signal/devicetransfer/WifiDirect.java
 create mode 100644 device-transfer/lib/src/main/java/org/signal/devicetransfer/WifiDirectUnavailableException.java
 create mode 100644 device-transfer/lib/witness-verifications.gradle

diff --git a/core-util/src/main/java/org/signal/core/util/ThreadUtil.java b/core-util/src/main/java/org/signal/core/util/ThreadUtil.java
index 54d68ba432..7c2b02d39b 100644
--- a/core-util/src/main/java/org/signal/core/util/ThreadUtil.java
+++ b/core-util/src/main/java/org/signal/core/util/ThreadUtil.java
@@ -87,4 +87,10 @@ public final class ThreadUtil {
       throw new AssertionError(e);
     }
   }
+
+  public static void interruptableSleep(long millis) {
+    try {
+      Thread.sleep(millis);
+    } catch (InterruptedException ignored) { }
+  }
 }
diff --git a/device-transfer/app/build.gradle b/device-transfer/app/build.gradle
new file mode 100644
index 0000000000..6bbc6ff010
--- /dev/null
+++ b/device-transfer/app/build.gradle
@@ -0,0 +1,30 @@
+apply plugin: 'com.android.application'
+
+android {
+    buildToolsVersion BUILD_TOOL_VERSION
+    compileSdkVersion COMPILE_SDK
+
+    defaultConfig {
+        applicationId "org.signal.devicetransfer.app"
+        versionCode 1
+        versionName "1.0"
+
+        minSdkVersion MINIMUM_SDK
+        targetSdkVersion TARGET_SDK
+    }
+
+    compileOptions {
+        sourceCompatibility JAVA_VERSION
+        targetCompatibility JAVA_VERSION
+    }
+}
+
+dependencies {
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'com.google.android.material:material:1.2.1'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+
+    testImplementation 'junit:junit:4.12'
+
+    implementation project(':device-transfer')
+}
diff --git a/device-transfer/app/src/main/AndroidManifest.xml b/device-transfer/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000000..f52af0ad3d
--- /dev/null
+++ b/device-transfer/app/src/main/AndroidManifest.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.signal.devicetransfer.app">
+
+  <application
+      android:allowBackup="true"
+      android:icon="@mipmap/ic_launcher"
+      android:label="@string/app_name"
+      android:roundIcon="@mipmap/ic_launcher_round"
+      android:supportsRtl="true"
+      android:theme="@style/Theme.DeviceTransferTest">
+    <activity android:name=".MainActivity">
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+
+        <category android:name="android.intent.category.LAUNCHER" />
+      </intent-filter>
+    </activity>
+  </application>
+
+</manifest>
diff --git a/device-transfer/app/src/main/java/org/signal/devicetransfer/app/MainActivity.java b/device-transfer/app/src/main/java/org/signal/devicetransfer/app/MainActivity.java
new file mode 100644
index 0000000000..2f19ea0c3e
--- /dev/null
+++ b/device-transfer/app/src/main/java/org/signal/devicetransfer/app/MainActivity.java
@@ -0,0 +1,152 @@
+package org.signal.devicetransfer.app;
+
+import android.Manifest;
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.os.Build;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.ViewGroup;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.NotificationManagerCompat;
+
+import org.greenrobot.eventbus.EventBus;
+import org.greenrobot.eventbus.Subscribe;
+import org.greenrobot.eventbus.ThreadMode;
+import org.signal.devicetransfer.ClientTask;
+import org.signal.devicetransfer.DeviceToDeviceTransferService;
+import org.signal.devicetransfer.DeviceToDeviceTransferService.TransferNotificationData;
+import org.signal.devicetransfer.ServerTask;
+import org.signal.devicetransfer.TransferMode;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.Random;
+
+public class MainActivity extends AppCompatActivity {
+
+  private static final String TRANSFER_NOTIFICATION_CHANNEL = "DEVICE_TO_DEVICE_TRANSFER";
+
+  private LinearLayout list;
+
+  @Override
+  protected void onCreate(@Nullable Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    setContentView(R.layout.activity_main);
+
+    if (Build.VERSION.SDK_INT > 26) {
+      NotificationChannel deviceTransfer = new NotificationChannel(TRANSFER_NOTIFICATION_CHANNEL, "Device Transfer", NotificationManager.IMPORTANCE_DEFAULT);
+      NotificationManagerCompat.from(this).createNotificationChannel(deviceTransfer);
+    }
+
+    list = findViewById(R.id.list);
+
+    final TransferNotificationData data = new TransferNotificationData(1337,
+                                                                       TRANSFER_NOTIFICATION_CHANNEL,
+                                                                       R.drawable.ic_refresh_20);
+
+    findViewById(R.id.start_server).setOnClickListener(v -> {
+      DeviceToDeviceTransferService.startServer(this,
+                                                8888,
+                                                new ServerReceiveRandomBytes(),
+                                                data,
+                                                PendingIntent.getActivity(this,
+                                                                          0,
+                                                                          new Intent(this, MainActivity.class),
+                                                                          0));
+
+      list.removeAllViews();
+    });
+
+    findViewById(R.id.start_client).setOnClickListener(v -> {
+      DeviceToDeviceTransferService.startClient(this,
+                                                8888,
+                                                new ClientSendRandomBytes(),
+                                                data,
+                                                PendingIntent.getActivity(this,
+                                                                          0,
+                                                                          new Intent(this, MainActivity.class),
+                                                                          0));
+
+      list.removeAllViews();
+    });
+
+    findViewById(R.id.stop).setOnClickListener(v -> {
+      DeviceToDeviceTransferService.stop(this);
+    });
+
+    findViewById(R.id.enable_permission).setOnClickListener(v -> {
+      if (Build.VERSION.SDK_INT >= 23 && checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
+        requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 420);
+      }
+    });
+
+    EventBus.getDefault().register(this);
+  }
+
+  @Subscribe(sticky = true, threadMode = ThreadMode.MAIN)
+  public void onEventMainThread(@NonNull TransferMode event) {
+    TextView text = new TextView(this);
+    text.setText(event.toString());
+    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
+    text.setLayoutParams(params);
+    list.addView(text);
+  }
+
+  private static class ClientSendRandomBytes implements ClientTask {
+
+    private static final String TAG = "ClientSend";
+
+    private final int rounds = 1000;
+
+    @Override
+    public void run(@NonNull Context context, @NonNull OutputStream outputStream) throws IOException {
+      Random r    = new Random(System.currentTimeMillis());
+      byte[] data = new byte[8192];
+      r.nextBytes(data);
+
+      long start = System.currentTimeMillis();
+      Log.i(TAG, "Sending " + ((data.length * rounds) / 1024 / 1024) + "MB of random data!!!");
+      for (int i = 0; i < rounds; i++) {
+        outputStream.write(data);
+        outputStream.flush();
+      }
+      long end = System.currentTimeMillis();
+      Log.i(TAG, "Sending took: " + (end - start));
+    }
+  }
+
+  private static class ServerReceiveRandomBytes implements ServerTask {
+
+    private static final String TAG = "ServerReceive";
+
+    @Override
+    public void run(@NonNull Context context, @NonNull InputStream inputStream) throws IOException {
+      long   start  = System.currentTimeMillis();
+      byte[] data   = new byte[8192];
+      int    result = 0;
+
+      int i = 0;
+      Log.i(TAG, "Start drinking from the fire hose!");
+      while (result >= 0) {
+        result = inputStream.read(data, 0, 8192);
+        i++;
+        if (i % 10000 == 0) {
+          Log.i(TAG, "Round: " + i);
+        }
+      }
+      long end = System.currentTimeMillis();
+      Log.i(TAG, "Receive took: " + (end - start));
+    }
+  }
+}
diff --git a/device-transfer/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/device-transfer/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
new file mode 100644
index 0000000000..18c0565852
--- /dev/null
+++ b/device-transfer/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -0,0 +1,31 @@
+<vector
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+  <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+    <aapt:attr name="android:fillColor">
+      <gradient
+          android:endX="85.84757"
+          android:endY="92.4963"
+          android:startX="42.9492"
+          android:startY="49.59793"
+          android:type="linear">
+        <item
+            android:color="#44000000"
+            android:offset="0.0" />
+        <item
+            android:color="#00000000"
+            android:offset="1.0" />
+      </gradient>
+    </aapt:attr>
+  </path>
+  <path
+      android:fillColor="#FFFFFF"
+      android:fillType="nonZero"
+      android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+      android:strokeWidth="1"
+      android:strokeColor="#00000000" />
+</vector>
\ No newline at end of file
diff --git a/device-transfer/app/src/main/res/drawable/ic_launcher_background.xml b/device-transfer/app/src/main/res/drawable/ic_launcher_background.xml
new file mode 100644
index 0000000000..c71b77f4d2
--- /dev/null
+++ b/device-transfer/app/src/main/res/drawable/ic_launcher_background.xml
@@ -0,0 +1,171 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+  <path
+      android:fillColor="#3DDC84"
+      android:pathData="M0,0h108v108h-108z" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M9,0L9,108"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M19,0L19,108"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M29,0L29,108"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M39,0L39,108"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M49,0L49,108"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M59,0L59,108"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M69,0L69,108"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M79,0L79,108"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M89,0L89,108"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M99,0L99,108"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,9L108,9"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,19L108,19"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,29L108,29"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,39L108,39"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,49L108,49"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,59L108,59"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,69L108,69"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,79L108,79"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,89L108,89"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,99L108,99"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M19,29L89,29"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M19,39L89,39"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M19,49L89,49"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M19,59L89,59"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M19,69L89,69"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M19,79L89,79"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M29,19L29,89"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M39,19L39,89"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M49,19L49,89"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M59,19L59,89"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M69,19L69,89"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M79,19L79,89"
+      android:strokeWidth="0.8"
+      android:strokeColor="#33FFFFFF" />
+</vector>
diff --git a/device-transfer/app/src/main/res/drawable/ic_refresh_20.xml b/device-transfer/app/src/main/res/drawable/ic_refresh_20.xml
new file mode 100644
index 0000000000..915e0bbbca
--- /dev/null
+++ b/device-transfer/app/src/main/res/drawable/ic_refresh_20.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="20dp"
+    android:height="20dp"
+    android:viewportWidth="20"
+    android:viewportHeight="20">
+  <path
+      android:fillColor="#FF000000"
+      android:pathData="M14.7,5.3A6.7,6.7 0,1 0,10 16.7a6.7,6.7 0,0 0,6.4 -5H14.7A5,5 0,1 1,10 5a4.9,4.9 0,0 1,3.5 1.5L10.8,9.2h5.9V3.3Z"/>
+</vector>
diff --git a/device-transfer/app/src/main/res/layout/activity_main.xml b/device-transfer/app/src/main/res/layout/activity_main.xml
new file mode 100644
index 0000000000..3a767e8ba7
--- /dev/null
+++ b/device-transfer/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity">
+
+
+    <Button
+        android:id="@+id/start_server"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Start Server"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/stop"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Stop"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/start_client" />
+
+    <Button
+        android:id="@+id/enable_permission"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Permission"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/stop" />
+
+    <LinearLayout
+        android:id="@+id/list"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:layout_marginStart="16dp"
+        android:layout_marginEnd="16dp"
+        android:orientation="vertical"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/enable_permission" />
+
+    <Button
+        android:id="@+id/start_client"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Start Client"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/start_server" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/device-transfer/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/device-transfer/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
new file mode 100644
index 0000000000..9244248264
--- /dev/null
+++ b/device-transfer/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon
+    xmlns:android="http://schemas.android.com/apk/res/android">
+  <background android:drawable="@drawable/ic_launcher_background" />
+  <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
\ No newline at end of file
diff --git a/device-transfer/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/device-transfer/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
new file mode 100644
index 0000000000..9244248264
--- /dev/null
+++ b/device-transfer/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon
+    xmlns:android="http://schemas.android.com/apk/res/android">
+  <background android:drawable="@drawable/ic_launcher_background" />
+  <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
\ No newline at end of file
diff --git a/device-transfer/app/src/main/res/mipmap-hdpi/ic_launcher.png b/device-transfer/app/src/main/res/mipmap-hdpi/ic_launcher.png
new file mode 100644
index 0000000000000000000000000000000000000000..a571e60098c92c2baca8a5df62f2929cbff01b52
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diff --git a/device-transfer/app/src/main/res/mipmap-hdpi/ic_launcher_round.png b/device-transfer/app/src/main/res/mipmap-hdpi/ic_launcher_round.png
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diff --git a/device-transfer/app/src/main/res/mipmap-xxhdpi/ic_launcher.png b/device-transfer/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
new file mode 100644
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diff --git a/device-transfer/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png b/device-transfer/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
new file mode 100644
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diff --git a/device-transfer/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png b/device-transfer/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
new file mode 100644
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diff --git a/device-transfer/app/src/main/res/values-night/themes.xml b/device-transfer/app/src/main/res/values-night/themes.xml
new file mode 100644
index 0000000000..469981c422
--- /dev/null
+++ b/device-transfer/app/src/main/res/values-night/themes.xml
@@ -0,0 +1,16 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+  <!-- Base application theme. -->
+  <style name="Theme.DeviceTransferTest" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+    <!-- Primary brand color. -->
+    <item name="colorPrimary">@color/purple_200</item>
+    <item name="colorPrimaryVariant">@color/purple_700</item>
+    <item name="colorOnPrimary">@color/black</item>
+    <!-- Secondary brand color. -->
+    <item name="colorSecondary">@color/teal_200</item>
+    <item name="colorSecondaryVariant">@color/teal_200</item>
+    <item name="colorOnSecondary">@color/black</item>
+    <!-- Status bar color. -->
+    <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
+    <!-- Customize your theme here. -->
+  </style>
+</resources>
\ No newline at end of file
diff --git a/device-transfer/app/src/main/res/values/colors.xml b/device-transfer/app/src/main/res/values/colors.xml
new file mode 100644
index 0000000000..09837df62f
--- /dev/null
+++ b/device-transfer/app/src/main/res/values/colors.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+  <color name="purple_200">#FFBB86FC</color>
+  <color name="purple_500">#FF6200EE</color>
+  <color name="purple_700">#FF3700B3</color>
+  <color name="teal_200">#FF03DAC5</color>
+  <color name="teal_700">#FF018786</color>
+  <color name="black">#FF000000</color>
+  <color name="white">#FFFFFFFF</color>
+</resources>
\ No newline at end of file
diff --git a/device-transfer/app/src/main/res/values/strings.xml b/device-transfer/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000000..3c533adc08
--- /dev/null
+++ b/device-transfer/app/src/main/res/values/strings.xml
@@ -0,0 +1,3 @@
+<resources>
+  <string name="app_name">DeviceTransferTest</string>
+</resources>
\ No newline at end of file
diff --git a/device-transfer/app/src/main/res/values/themes.xml b/device-transfer/app/src/main/res/values/themes.xml
new file mode 100644
index 0000000000..00c51022b9
--- /dev/null
+++ b/device-transfer/app/src/main/res/values/themes.xml
@@ -0,0 +1,16 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+  <!-- Base application theme. -->
+  <style name="Theme.DeviceTransferTest" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+    <!-- Primary brand color. -->
+    <item name="colorPrimary">@color/purple_500</item>
+    <item name="colorPrimaryVariant">@color/purple_700</item>
+    <item name="colorOnPrimary">@color/white</item>
+    <!-- Secondary brand color. -->
+    <item name="colorSecondary">@color/teal_200</item>
+    <item name="colorSecondaryVariant">@color/teal_700</item>
+    <item name="colorOnSecondary">@color/black</item>
+    <!-- Status bar color. -->
+    <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
+    <!-- Customize your theme here. -->
+  </style>
+</resources>
\ No newline at end of file
diff --git a/device-transfer/lib/build.gradle b/device-transfer/lib/build.gradle
new file mode 100644
index 0000000000..c4352837dc
--- /dev/null
+++ b/device-transfer/lib/build.gradle
@@ -0,0 +1,30 @@
+apply plugin: 'com.android.library'
+apply plugin: 'witness'
+apply from: 'witness-verifications.gradle'
+
+android {
+    buildToolsVersion BUILD_TOOL_VERSION
+    compileSdkVersion COMPILE_SDK
+
+    defaultConfig {
+        minSdkVersion MINIMUM_SDK
+        targetSdkVersion TARGET_SDK
+    }
+
+    compileOptions {
+        sourceCompatibility JAVA_VERSION
+        targetCompatibility JAVA_VERSION
+    }
+}
+
+dependencyVerification {
+    configuration = '(debug|release)RuntimeClasspath'
+}
+
+dependencies {
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'com.google.android.material:material:1.2.1'
+    implementation project(':core-util')
+    api 'org.greenrobot:eventbus:3.0.0'
+    testImplementation 'junit:junit:4.12'
+}
diff --git a/device-transfer/lib/src/main/AndroidManifest.xml b/device-transfer/lib/src/main/AndroidManifest.xml
new file mode 100644
index 0000000000..d2aa7e0a6a
--- /dev/null
+++ b/device-transfer/lib/src/main/AndroidManifest.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.signal.devicetransfer">
+
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+
+    <application>
+        <service
+            android:name=".DeviceToDeviceTransferService"
+            android:enabled="true"
+            android:exported="false" />
+    </application>
+
+</manifest>
diff --git a/device-transfer/lib/src/main/java/org/signal/devicetransfer/ClientTask.java b/device-transfer/lib/src/main/java/org/signal/devicetransfer/ClientTask.java
new file mode 100644
index 0000000000..b506e84068
--- /dev/null
+++ b/device-transfer/lib/src/main/java/org/signal/devicetransfer/ClientTask.java
@@ -0,0 +1,22 @@
+package org.signal.devicetransfer;
+
+import android.content.Context;
+
+import androidx.annotation.NonNull;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.Serializable;
+
+/**
+ * Self-contained chunk of code to run once the {@link DeviceTransferClient} connects to a
+ * {@link DeviceTransferServer}.
+ */
+public interface ClientTask extends Serializable {
+
+  /**
+   * @param context      Android context, mostly like the foreground transfer service
+   * @param outputStream Output stream associated with socket connected to remote server.
+   */
+  void run(@NonNull Context context, @NonNull OutputStream outputStream) throws IOException;
+}
diff --git a/device-transfer/lib/src/main/java/org/signal/devicetransfer/DeviceToDeviceTransferService.java b/device-transfer/lib/src/main/java/org/signal/devicetransfer/DeviceToDeviceTransferService.java
new file mode 100644
index 0000000000..f7486a889c
--- /dev/null
+++ b/device-transfer/lib/src/main/java/org/signal/devicetransfer/DeviceToDeviceTransferService.java
@@ -0,0 +1,248 @@
+package org.signal.devicetransfer;
+
+import android.app.Notification;
+import android.app.PendingIntent;
+import android.app.Service;
+import android.content.Context;
+import android.content.Intent;
+import android.os.IBinder;
+import android.os.Parcel;
+import android.os.Parcelable;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.core.app.NotificationCompat;
+
+import org.greenrobot.eventbus.EventBus;
+import org.greenrobot.eventbus.Subscribe;
+import org.greenrobot.eventbus.ThreadMode;
+import org.signal.core.util.ThreadUtil;
+import org.signal.core.util.logging.Log;
+
+import java.util.Objects;
+
+/**
+ * Foreground service to help manage interactions with the {@link DeviceTransferClient} and
+ * {@link DeviceTransferServer}.
+ */
+public class DeviceToDeviceTransferService extends Service implements ShutdownCallback {
+
+  private static final String TAG = Log.tag(DeviceToDeviceTransferService.class);
+
+  private static final int INVALID_PORT = -1;
+
+  private static final String ACTION_START_SERVER = "start";
+  private static final String ACTION_START_CLIENT = "start_client";
+  private static final String ACTION_STOP         = "stop";
+
+  private static final String EXTRA_PENDING_INTENT = "extra_pending_intent";
+  private static final String EXTRA_TASK           = "extra_task";
+  private static final String EXTRA_NOTIFICATION   = "extra_notification_data";
+  private static final String EXTRA_PORT           = "extra_port";
+
+  private TransferNotificationData notificationData;
+  private PendingIntent            pendingIntent;
+  private DeviceTransferServer     server;
+  private DeviceTransferClient     client;
+
+  public static void startServer(@NonNull Context context,
+                                 int port,
+                                 @NonNull ServerTask serverTask,
+                                 @NonNull TransferNotificationData transferNotificationData,
+                                 @Nullable PendingIntent pendingIntent)
+  {
+    Intent intent = new Intent(context, DeviceToDeviceTransferService.class);
+    intent.setAction(ACTION_START_SERVER)
+          .putExtra(EXTRA_TASK, serverTask)
+          .putExtra(EXTRA_PORT, port)
+          .putExtra(EXTRA_NOTIFICATION, transferNotificationData)
+          .putExtra(EXTRA_PENDING_INTENT, pendingIntent);
+
+    context.startService(intent);
+  }
+
+  public static void startClient(@NonNull Context context,
+                                 int port,
+                                 @NonNull ClientTask clientTask,
+                                 @NonNull TransferNotificationData transferNotificationData,
+                                 @Nullable PendingIntent pendingIntent)
+  {
+    Intent intent = new Intent(context, DeviceToDeviceTransferService.class);
+    intent.setAction(ACTION_START_CLIENT)
+          .putExtra(EXTRA_TASK, clientTask)
+          .putExtra(EXTRA_PORT, port)
+          .putExtra(EXTRA_NOTIFICATION, transferNotificationData)
+          .putExtra(EXTRA_PENDING_INTENT, pendingIntent);
+
+    context.startService(intent);
+  }
+
+  public static void stop(@NonNull Context context) {
+    context.startService(new Intent(context, DeviceToDeviceTransferService.class).setAction(ACTION_STOP));
+  }
+
+  @Override
+  public void onCreate() {
+    super.onCreate();
+    Log.e(TAG, "onCreate");
+
+    EventBus.getDefault().register(this);
+  }
+
+  @Subscribe(sticky = true, threadMode = ThreadMode.MAIN)
+  public void onEventMainThread(@NonNull TransferMode event) {
+    updateNotification(event);
+  }
+
+  private void update(@NonNull TransferMode transferMode) {
+    EventBus.getDefault().postSticky(transferMode);
+  }
+
+  @Override
+  public void onDestroy() {
+    Log.e(TAG, "onDestroy");
+
+    EventBus.getDefault().unregister(this);
+
+    if (client != null) {
+      client.shutdown();
+      client = null;
+    }
+
+    if (server != null) {
+      server.shutdown();
+      server = null;
+    }
+
+    super.onDestroy();
+  }
+
+  @Override
+  public int onStartCommand(@Nullable Intent intent, int flags, int startId) {
+    if (intent == null) {
+      return START_NOT_STICKY;
+    }
+
+    final String action = intent.getAction();
+    if (action == null) {
+      return START_NOT_STICKY;
+    }
+
+    final WifiDirect.AvailableStatus availability = WifiDirect.getAvailability(this);
+    if (availability != WifiDirect.AvailableStatus.AVAILABLE) {
+      update(availability == WifiDirect.AvailableStatus.FINE_LOCATION_PERMISSION_NOT_GRANTED ? TransferMode.PERMISSIONS
+                                                                                             : TransferMode.UNAVAILABLE);
+      shutdown();
+      return START_NOT_STICKY;
+    }
+
+    switch (action) {
+      case ACTION_START_SERVER: {
+        int port = intent.getIntExtra(EXTRA_PORT, INVALID_PORT);
+        if (server == null && port != -1) {
+          notificationData = intent.getParcelableExtra(EXTRA_NOTIFICATION);
+          pendingIntent    = intent.getParcelableExtra(EXTRA_PENDING_INTENT);
+          server           = new DeviceTransferServer(getApplicationContext(),
+                                                      (ServerTask) Objects.requireNonNull(intent.getSerializableExtra(EXTRA_TASK)),
+                                                      port,
+                                                      this);
+          updateNotification(TransferMode.READY);
+          server.start();
+        } else {
+          Log.i(TAG, "Can't start server. already_started: " + (server != null) + " port: " + port);
+        }
+        break;
+      }
+      case ACTION_START_CLIENT: {
+        int port = intent.getIntExtra(EXTRA_PORT, INVALID_PORT);
+        if (client == null && port != -1) {
+          notificationData = intent.getParcelableExtra(EXTRA_NOTIFICATION);
+          pendingIntent    = intent.getParcelableExtra(EXTRA_PENDING_INTENT);
+          client           = new DeviceTransferClient(getApplicationContext(),
+                                                      (ClientTask) Objects.requireNonNull(intent.getSerializableExtra(EXTRA_TASK)),
+                                                      port,
+                                                      this);
+          updateNotification(TransferMode.READY);
+          client.start();
+        } else {
+          Log.i(TAG, "Can't start client. already_started: " + (client != null) + " port: " + port);
+        }
+        break;
+      }
+      case ACTION_STOP:
+        shutdown();
+        break;
+    }
+
+    return START_STICKY;
+  }
+
+  @Override
+  public void shutdown() {
+    Log.i(TAG, "Shutdown");
+    ThreadUtil.runOnMain(() -> {
+      stopForeground(true);
+      stopSelf();
+    });
+  }
+
+  private void updateNotification(@NonNull TransferMode transferMode) {
+    if (notificationData != null && (client != null || server != null)) {
+      startForeground(notificationData.notificationId, createNotification(transferMode, notificationData));
+    }
+  }
+
+  private @NonNull Notification createNotification(@NonNull TransferMode transferMode, @NonNull TransferNotificationData notificationData) {
+    NotificationCompat.Builder builder = new NotificationCompat.Builder(this, notificationData.channelId);
+
+    //TODO [cody] build notification to spec
+    builder.setSmallIcon(notificationData.icon)
+           .setOngoing(true)
+           .setContentTitle("Device Transfer")
+           .setContentText("Status: " + transferMode.name())
+           .setContentIntent(pendingIntent);
+
+    return builder.build();
+  }
+
+  @Override
+  public @Nullable IBinder onBind(@NonNull Intent intent) {
+    throw new UnsupportedOperationException();
+  }
+
+  public static class TransferNotificationData implements Parcelable {
+    private final int    notificationId;
+    private final String channelId;
+    private final int    icon;
+
+    public TransferNotificationData(int notificationId, @NonNull String channelId, int icon) {
+      this.notificationId = notificationId;
+      this.channelId      = channelId;
+      this.icon           = icon;
+    }
+
+    @Override
+    public void writeToParcel(@NonNull Parcel dest, int flags) {
+      dest.writeInt(notificationId);
+      dest.writeString(channelId);
+      dest.writeInt(icon);
+    }
+
+    @Override
+    public int describeContents() {
+      return 0;
+    }
+
+    public static final Creator<TransferNotificationData> CREATOR = new Creator<TransferNotificationData>() {
+      @Override
+      public @NonNull TransferNotificationData createFromParcel(@NonNull Parcel in) {
+        return new TransferNotificationData(in.readInt(), in.readString(), in.readInt());
+      }
+
+      @Override
+      public @NonNull TransferNotificationData[] newArray(int size) {
+        return new TransferNotificationData[size];
+      }
+    };
+  }
+}
diff --git a/device-transfer/lib/src/main/java/org/signal/devicetransfer/DeviceTransferClient.java b/device-transfer/lib/src/main/java/org/signal/devicetransfer/DeviceTransferClient.java
new file mode 100644
index 0000000000..e0b8548ee3
--- /dev/null
+++ b/device-transfer/lib/src/main/java/org/signal/devicetransfer/DeviceTransferClient.java
@@ -0,0 +1,339 @@
+package org.signal.devicetransfer;
+
+import android.content.Context;
+import android.net.wifi.p2p.WifiP2pDevice;
+import android.net.wifi.p2p.WifiP2pInfo;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.os.Message;
+
+import androidx.annotation.AnyThread;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import org.greenrobot.eventbus.EventBus;
+import org.signal.core.util.ThreadUtil;
+import org.signal.core.util.concurrent.SignalExecutors;
+import org.signal.core.util.logging.Log;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Encapsulates the logic to find and establish a WiFi Direct connection with another
+ * device and then perform an arbitrary {@link ClientTask} with the TCP socket.
+ * <p>
+ * The client attempts multiple times to establish the network and deal with connectivity
+ * problems. It will also retry the task if an issue occurs while running it.
+ * <p>
+ * The client is setup to retry indefinitely and will only bail on its own if it's
+ * unable to start {@link WifiDirect}. A call to {@link #shutdown()} is required to
+ * stop client from the "outside."
+ * <p>
+ * Summary of mitigations:
+ * <ul>
+ *   <li>Completely tear down and restart WiFi direct if no server is found within the timeout.</li>
+ *   <li>Retry connecting to the WiFi Direct network, and after all retries fail it does a complete tear down and restart.</li>
+ *   <li>Retry connecting to the server until successful, disconnected from WiFi Direct network, or told to stop.</li>
+ * </ul>
+ */
+public final class DeviceTransferClient implements Handler.Callback {
+
+  private static final String TAG                  = Log.tag(DeviceTransferClient.class);
+  private static final int    START_CLIENT         = 0;
+  private static final int    START_NETWORK_CLIENT = 1;
+  private static final int    NETWORK_DISCONNECTED = 2;
+  private static final int    CONNECT_TO_SERVICE   = 3;
+  private static final int    RESTART_CLIENT       = 4;
+  private static final int    START_IP_EXCHANGE    = 5;
+  private static final int    IP_EXCHANGE_SUCCESS  = 6;
+
+  private final Context                     context;
+  private final int                         port;
+  private       HandlerThread               commandAndControlThread;
+  private final Handler                     handler;
+  private final ClientTask                  clientTask;
+  private final ShutdownCallback            shutdownCallback;
+  private       WifiDirect                  wifiDirect;
+  private       ClientThread                clientThread;
+  private final Runnable                    autoRestart;
+  private       IpExchange.IpExchangeThread ipExchangeThread;
+
+  private static void update(@NonNull TransferMode transferMode) {
+    EventBus.getDefault().postSticky(transferMode);
+  }
+
+  @AnyThread
+  public DeviceTransferClient(@NonNull Context context, @NonNull ClientTask clientTask, int port, @Nullable ShutdownCallback shutdownCallback) {
+    this.context                 = context;
+    this.clientTask              = clientTask;
+    this.port                    = port;
+    this.shutdownCallback        = shutdownCallback;
+    this.commandAndControlThread = SignalExecutors.getAndStartHandlerThread("client-cnc");
+    this.handler                 = new Handler(commandAndControlThread.getLooper(), this);
+    this.autoRestart             = () -> {
+      Log.i(TAG, "Restarting WiFi Direct since we haven't found anything yet and it could be us.");
+      handler.sendEmptyMessage(RESTART_CLIENT);
+    };
+  }
+
+  @AnyThread
+  public void start() {
+    handler.sendMessage(handler.obtainMessage(START_CLIENT));
+  }
+
+  @AnyThread
+  public synchronized void shutdown() {
+    stopIpExchange();
+    stopClient();
+    stopWifiDirect();
+
+    if (commandAndControlThread != null) {
+      Log.i(TAG, "Shutting down command and control");
+      commandAndControlThread.quit();
+      commandAndControlThread.interrupt();
+      commandAndControlThread = null;
+    }
+  }
+
+  @Override
+  public boolean handleMessage(@NonNull Message message) {
+    switch (message.what) {
+      case START_CLIENT:
+        startWifiDirect();
+        break;
+      case START_NETWORK_CLIENT:
+        startClient((String) message.obj);
+        break;
+      case NETWORK_DISCONNECTED:
+        stopClient();
+        break;
+      case CONNECT_TO_SERVICE:
+        connectToService((String) message.obj);
+        break;
+      case RESTART_CLIENT:
+        stopClient();
+        stopWifiDirect();
+        startWifiDirect();
+        break;
+      case START_IP_EXCHANGE:
+        startIpExchange((String) message.obj);
+        break;
+      case IP_EXCHANGE_SUCCESS:
+        ipExchangeSuccessful((String) message.obj);
+        break;
+      default:
+        shutdown();
+        if (shutdownCallback != null) {
+          shutdownCallback.shutdown();
+        }
+        throw new AssertionError();
+    }
+    return false;
+  }
+
+  private void startWifiDirect() {
+    if (wifiDirect != null) {
+      Log.e(TAG, "Client already started");
+      return;
+    }
+
+    update(TransferMode.STARTING_UP);
+
+    try {
+      wifiDirect = new WifiDirect(context);
+      wifiDirect.initialize(new WifiDirectListener());
+      wifiDirect.discoverService();
+      Log.i(TAG, "Started service discovery, searching for service...");
+      update(TransferMode.DISCOVERY);
+      handler.postDelayed(autoRestart, TimeUnit.SECONDS.toMillis(15));
+    } catch (WifiDirectUnavailableException e) {
+      Log.e(TAG, e);
+      shutdown();
+      update(TransferMode.FAILED);
+      if (shutdownCallback != null) {
+        shutdownCallback.shutdown();
+      }
+    }
+  }
+
+  private void stopWifiDirect() {
+    handler.removeCallbacks(autoRestart);
+
+    if (wifiDirect != null) {
+      Log.i(TAG, "Shutting down WiFi Direct");
+      wifiDirect.shutdown();
+      wifiDirect = null;
+      update(TransferMode.READY);
+    }
+  }
+
+  private void startClient(@NonNull String serverHostAddress) {
+    if (clientThread != null) {
+      Log.i(TAG, "Client already running");
+      return;
+    }
+
+    Log.i(TAG, "Connection established, spinning up network client.");
+    clientThread = new ClientThread(context, clientTask, serverHostAddress, port);
+    clientThread.start();
+  }
+
+  private void stopClient() {
+    if (clientThread != null) {
+      Log.i(TAG, "Shutting down ClientThread");
+      clientThread.shutdown();
+      clientThread = null;
+    }
+  }
+
+  private void connectToService(@NonNull String deviceAddress) {
+    if (wifiDirect == null) {
+      Log.w(TAG, "WifiDirect is not initialized, we shouldn't be here.");
+      return;
+    }
+
+    handler.removeCallbacks(autoRestart);
+
+    int tries = 5;
+    while ((tries--) > 0) {
+      try {
+        wifiDirect.connect(deviceAddress);
+        update(TransferMode.NETWORK_CONNECTED);
+        return;
+      } catch (WifiDirectUnavailableException e) {
+        Log.w(TAG, "Unable to connect, tries: " + tries);
+        ThreadUtil.sleep(TimeUnit.SECONDS.toMillis(2));
+      }
+    }
+
+    handler.sendMessage(handler.obtainMessage(RESTART_CLIENT));
+  }
+
+  private void startIpExchange(@NonNull String groupOwnerHostAddress) {
+    ipExchangeThread = IpExchange.getIp(groupOwnerHostAddress, port, handler, IP_EXCHANGE_SUCCESS);
+  }
+
+  private void stopIpExchange() {
+    if (ipExchangeThread != null) {
+      ipExchangeThread.shutdown();
+      ipExchangeThread = null;
+    }
+  }
+
+  private void ipExchangeSuccessful(@NonNull String host) {
+    stopIpExchange();
+    handler.sendMessage(handler.obtainMessage(START_NETWORK_CLIENT, host));
+  }
+
+  private static class ClientThread extends Thread {
+
+    private volatile Socket  client;
+    private volatile boolean isRunning;
+
+    private final Context    context;
+    private final ClientTask clientTask;
+    private final String     serverHostAddress;
+    private final int        port;
+
+    public ClientThread(@NonNull Context context,
+                        @NonNull ClientTask clientTask,
+                        @NonNull String serverHostAddress,
+                        int port)
+    {
+      this.context           = context;
+      this.clientTask        = clientTask;
+      this.serverHostAddress = serverHostAddress;
+      this.port              = port;
+    }
+
+    @Override
+    public void run() {
+      Log.i(TAG, "Client thread running");
+      isRunning = true;
+
+      while (shouldKeepRunning()) {
+        Log.i(TAG, "Attempting to connect to server...");
+
+        try {
+          client = new Socket();
+          try {
+            client.bind(null);
+            client.connect(new InetSocketAddress(serverHostAddress, port), 10000);
+            DeviceTransferClient.update(TransferMode.SERVICE_CONNECTED);
+
+            clientTask.run(context, client.getOutputStream());
+
+            Log.i(TAG, "Done!!");
+            isRunning = false;
+          } catch (IOException e) {
+            Log.w(TAG, "Error connecting to server", e);
+          }
+        } catch (Exception e) {
+          Log.w(TAG, e);
+        } finally {
+          if (client != null && !client.isClosed()) {
+            try {
+              client.close();
+            } catch (IOException ignored) {}
+          }
+          DeviceTransferClient.update(TransferMode.NETWORK_CONNECTED);
+        }
+
+        if (shouldKeepRunning()) {
+          ThreadUtil.interruptableSleep(TimeUnit.SECONDS.toMillis(3));
+        }
+      }
+
+      Log.i(TAG, "Client exiting");
+    }
+
+    public void shutdown() {
+      isRunning = false;
+      try {
+        if (client != null) {
+          client.close();
+        }
+      } catch (IOException e) {
+        Log.w(TAG, "Error shutting down client socket", e);
+      }
+      interrupt();
+    }
+
+    private boolean shouldKeepRunning() {
+      return !isInterrupted() && isRunning;
+    }
+  }
+
+  public class WifiDirectListener implements WifiDirect.WifiDirectConnectionListener {
+
+    @Override
+    public void onServiceDiscovered(@NonNull WifiP2pDevice serviceDevice) {
+      handler.sendMessage(handler.obtainMessage(CONNECT_TO_SERVICE, serviceDevice.deviceAddress));
+    }
+
+    @Override
+    public void onNetworkConnected(@NonNull WifiP2pInfo info) {
+      if (info.isGroupOwner) {
+        handler.sendEmptyMessage(START_IP_EXCHANGE);
+      } else {
+        handler.sendMessage(handler.obtainMessage(START_NETWORK_CLIENT, info.groupOwnerAddress.getHostAddress()));
+      }
+    }
+
+    @Override
+    public void onNetworkDisconnected() {
+      handler.sendEmptyMessage(NETWORK_DISCONNECTED);
+    }
+
+    @Override
+    public void onNetworkFailure() {
+      handler.sendEmptyMessage(NETWORK_DISCONNECTED);
+    }
+
+    @Override
+    public void onLocalDeviceChanged(@NonNull WifiP2pDevice localDevice) { }
+  }
+}
diff --git a/device-transfer/lib/src/main/java/org/signal/devicetransfer/DeviceTransferServer.java b/device-transfer/lib/src/main/java/org/signal/devicetransfer/DeviceTransferServer.java
new file mode 100644
index 0000000000..5e83fdc071
--- /dev/null
+++ b/device-transfer/lib/src/main/java/org/signal/devicetransfer/DeviceTransferServer.java
@@ -0,0 +1,290 @@
+package org.signal.devicetransfer;
+
+import android.content.Context;
+import android.net.wifi.p2p.WifiP2pDevice;
+import android.net.wifi.p2p.WifiP2pInfo;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.os.Message;
+
+import androidx.annotation.AnyThread;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import org.greenrobot.eventbus.EventBus;
+import org.signal.core.util.ThreadUtil;
+import org.signal.core.util.concurrent.SignalExecutors;
+import org.signal.core.util.logging.Log;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Encapsulates the logic to advertise the availability of a transfer service over a WiFi Direct
+ * network, establish a WiFi Direct network, and then act as a TCP server for a {@link DeviceTransferClient}.
+ * <p>
+ * Once up an running, the server will continue to run until told to stop. Unlike the client the
+ * server has a harder time knowing there are problems and thus doesn't have mitigations to help
+ * with connectivity issues. Once connected to a client, the TCP server will run until told to stop.
+ * This means that multiple serial connections to it could be made if needed.
+ * <p>
+ * Testing found that restarting the client worked better than restarting the server when having WiFi
+ * Direct setup issues.
+ */
+public final class DeviceTransferServer implements Handler.Callback {
+
+  private static final String TAG                  = Log.tag(DeviceTransferServer.class);
+  private static final int    START_SERVER         = 0;
+  private static final int    START_NETWORK_SERVER = 1;
+  private static final int    NETWORK_DISCONNECTED = 2;
+  private static final int    START_IP_EXCHANGE    = 3;
+  private static final int    IP_EXCHANGE_SUCCESS  = 4;
+
+  private       ServerThread                serverThread;
+  private       HandlerThread               commandAndControlThread;
+  private final Handler                     handler;
+  private       WifiDirect                  wifiDirect;
+  private final Context                     context;
+  private final ServerTask                  serverTask;
+  private final int                         port;
+  private final ShutdownCallback            shutdownCallback;
+  private       IpExchange.IpExchangeThread ipExchangeThread;
+
+  private static void update(@NonNull TransferMode transferMode) {
+    EventBus.getDefault().postSticky(transferMode);
+  }
+
+  @AnyThread
+  public DeviceTransferServer(@NonNull Context context, @NonNull ServerTask serverTask, int port, @Nullable ShutdownCallback shutdownCallback) {
+    this.context                 = context;
+    this.serverTask              = serverTask;
+    this.port                    = port;
+    this.shutdownCallback        = shutdownCallback;
+    this.commandAndControlThread = SignalExecutors.getAndStartHandlerThread("server-cnc");
+    this.handler                 = new Handler(commandAndControlThread.getLooper(), this);
+  }
+
+  @AnyThread
+  public void start() {
+    handler.sendMessage(handler.obtainMessage(START_SERVER));
+  }
+
+  @AnyThread
+  public synchronized void shutdown() {
+    stopIpExchange();
+    stopServer();
+    stopWifiDirect();
+
+    if (commandAndControlThread != null) {
+      Log.i(TAG, "Shutting down command and control");
+      commandAndControlThread.quit();
+      commandAndControlThread.interrupt();
+      commandAndControlThread = null;
+    }
+  }
+
+  @Override
+  public boolean handleMessage(@NonNull Message message) {
+    switch (message.what) {
+      case START_SERVER:
+        startWifiDirect();
+        break;
+      case START_NETWORK_SERVER:
+        startServer();
+        break;
+      case NETWORK_DISCONNECTED:
+        stopServer();
+        break;
+      case START_IP_EXCHANGE:
+        startIpExchange((String) message.obj);
+        break;
+      case IP_EXCHANGE_SUCCESS:
+        ipExchangeSuccessful();
+        break;
+      default:
+        shutdown();
+        if (shutdownCallback != null) {
+          shutdownCallback.shutdown();
+        }
+        throw new AssertionError();
+    }
+    return false;
+  }
+
+  private void startWifiDirect() {
+    if (wifiDirect != null) {
+      Log.e(TAG, "Server already started");
+      return;
+    }
+
+    update(TransferMode.STARTING_UP);
+
+    try {
+      wifiDirect = new WifiDirect(context);
+      wifiDirect.initialize(new WifiDirectListener());
+      wifiDirect.startDiscoveryService();
+      Log.i(TAG, "Started discovery service, waiting for connections...");
+      update(TransferMode.DISCOVERY);
+    } catch (WifiDirectUnavailableException e) {
+      Log.e(TAG, e);
+      shutdown();
+      update(TransferMode.FAILED);
+      if (shutdownCallback != null) {
+        shutdownCallback.shutdown();
+      }
+    }
+  }
+
+  private void stopWifiDirect() {
+    if (wifiDirect != null) {
+      Log.i(TAG, "Shutting down WiFi Direct");
+      wifiDirect.shutdown();
+      wifiDirect = null;
+      update(TransferMode.READY);
+    }
+  }
+
+  private void startServer() {
+    if (serverThread != null) {
+      Log.i(TAG, "Server already running");
+      return;
+    }
+
+    Log.i(TAG, "Connection established, spinning up network server.");
+    serverThread = new ServerThread(context, serverTask, port);
+    serverThread.start();
+
+    update(TransferMode.NETWORK_CONNECTED);
+  }
+
+  private void stopServer() {
+    if (serverThread != null) {
+      Log.i(TAG, "Shutting down ServerThread");
+      serverThread.shutdown();
+      serverThread = null;
+    }
+  }
+
+  private void startIpExchange(@NonNull String groupOwnerHostAddress) {
+    ipExchangeThread = IpExchange.giveIp(groupOwnerHostAddress, port, handler, IP_EXCHANGE_SUCCESS);
+  }
+
+  private void stopIpExchange() {
+    if (ipExchangeThread != null) {
+      ipExchangeThread.shutdown();
+      ipExchangeThread = null;
+    }
+  }
+
+  private void ipExchangeSuccessful() {
+    stopIpExchange();
+    handler.sendEmptyMessage(START_NETWORK_SERVER);
+  }
+
+  public static class ServerThread extends Thread {
+
+    private final    Context      context;
+    private final    ServerTask   serverTask;
+    private final    int          port;
+    private volatile ServerSocket serverSocket;
+    private volatile boolean      isRunning;
+
+    public ServerThread(@NonNull Context context, @NonNull ServerTask serverTask, int port) {
+      this.context    = context;
+      this.serverTask = serverTask;
+      this.port       = port;
+    }
+
+    @Override
+    public void run() {
+      Log.i(TAG, "Server thread running");
+      isRunning = true;
+
+      while (shouldKeepRunning()) {
+        Log.i(TAG, "Starting up server socket...");
+        try {
+          serverSocket = new ServerSocket(port);
+          while (shouldKeepRunning() && !serverSocket.isClosed()) {
+            Log.i(TAG, "Waiting for client socket accept...");
+            try {
+              handleClient(serverSocket.accept());
+            } catch (IOException e) {
+              if (isRunning) {
+                Log.i(TAG, "Error connecting with client or server socket closed.", e);
+              } else {
+                Log.i(TAG, "Server shutting down...");
+              }
+            } finally {
+              update(TransferMode.NETWORK_CONNECTED);
+            }
+          }
+        } catch (Exception e) {
+          Log.w(TAG, e);
+        } finally {
+          if (serverSocket != null && !serverSocket.isClosed()) {
+            try {
+              serverSocket.close();
+            } catch (IOException ignored) {}
+          }
+          update(TransferMode.NETWORK_CONNECTED);
+        }
+
+        if (shouldKeepRunning()) {
+          ThreadUtil.interruptableSleep(TimeUnit.SECONDS.toMillis(3));
+        }
+      }
+
+      Log.i(TAG, "Server exiting");
+    }
+
+    public void shutdown() {
+      isRunning = false;
+      try {
+        serverSocket.close();
+      } catch (IOException e) {
+        Log.w(TAG, "Error shutting down server socket", e);
+      }
+      interrupt();
+    }
+
+    private void handleClient(@NonNull Socket clientSocket) throws IOException {
+      update(TransferMode.SERVICE_CONNECTED);
+      serverTask.run(context, clientSocket.getInputStream());
+      clientSocket.close();
+    }
+
+    private boolean shouldKeepRunning() {
+      return !isInterrupted() && isRunning;
+    }
+  }
+
+  public class WifiDirectListener implements WifiDirect.WifiDirectConnectionListener {
+
+    @Override
+    public void onNetworkConnected(@NonNull WifiP2pInfo info) {
+      if (info.isGroupOwner) {
+        handler.sendEmptyMessage(START_NETWORK_SERVER);
+      } else {
+        handler.sendMessage(handler.obtainMessage(START_IP_EXCHANGE, info.groupOwnerAddress.getHostAddress()));
+      }
+    }
+
+    @Override
+    public void onNetworkDisconnected() {
+      handler.sendEmptyMessage(NETWORK_DISCONNECTED);
+    }
+
+    @Override
+    public void onNetworkFailure() {
+      handler.sendEmptyMessage(NETWORK_DISCONNECTED);
+    }
+
+    @Override
+    public void onLocalDeviceChanged(@NonNull WifiP2pDevice localDevice) { }
+
+    @Override
+    public void onServiceDiscovered(@NonNull WifiP2pDevice serviceDevice) { }
+  }
+}
diff --git a/device-transfer/lib/src/main/java/org/signal/devicetransfer/IpExchange.java b/device-transfer/lib/src/main/java/org/signal/devicetransfer/IpExchange.java
new file mode 100644
index 0000000000..0cf16f5cb6
--- /dev/null
+++ b/device-transfer/lib/src/main/java/org/signal/devicetransfer/IpExchange.java
@@ -0,0 +1,148 @@
+package org.signal.devicetransfer;
+
+import android.os.Handler;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import org.signal.core.util.ThreadUtil;
+import org.signal.core.util.logging.Log;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * A WiFi Direct group is created auto-magically when connecting and randomly determines the group owner.
+ * Only the group owner's host address is exposed via the WiFi Direct APIs and thus sometimes the client
+ * is selected as the group owner and is unable to know the host address of the server.
+ *
+ * When this occurs, {@link #giveIp(String, int, Handler, int)} and {@link #getIp(String, int, Handler, int)} allow
+ * the two to connect briefly and use the connected socket to determine the host address of the other.
+ */
+public final class IpExchange {
+
+  private IpExchange() { }
+
+  public static @NonNull IpExchangeThread giveIp(@NonNull String host, int port, @NonNull Handler handler, int message) {
+    IpExchangeThread thread = new IpExchangeThread(host, port, false, handler, message);
+    thread.start();
+    return thread;
+  }
+
+  public static @NonNull IpExchangeThread getIp(@NonNull String host, int port, @NonNull Handler handler, int message) {
+    IpExchangeThread thread = new IpExchangeThread(host, port, true, handler, message);
+    thread.start();
+    return thread;
+  }
+
+  public static class IpExchangeThread extends Thread {
+
+    private static final String TAG = Log.tag(IpExchangeThread.class);
+
+    private volatile ServerSocket serverSocket;
+    private volatile Socket       client;
+    private volatile boolean      isRunning;
+
+    private final String  serverHostAddress;
+    private final int     port;
+    private final boolean needsIp;
+    private final Handler handler;
+    private final int     message;
+
+    public IpExchangeThread(@NonNull String serverHostAddress, int port, boolean needsIp, @NonNull Handler handler, int message) {
+      this.serverHostAddress = serverHostAddress;
+      this.port              = port;
+      this.needsIp           = needsIp;
+      this.handler           = handler;
+      this.message           = message;
+    }
+
+    @Override
+    public void run() {
+      Log.i(TAG, "Running...");
+      isRunning = true;
+
+      while (shouldKeepRunning()) {
+        Log.i(TAG, "Attempting to connect to server...");
+
+        try {
+          if (needsIp) {
+            getIp();
+          } else {
+            sendIp();
+          }
+        } catch (Exception e) {
+          Log.w(TAG, e);
+        } finally {
+          if (client != null && !client.isClosed()) {
+            try {
+              client.close();
+            } catch (IOException ignored) {}
+          }
+
+          if (serverSocket != null) {
+            try {
+              serverSocket.close();
+            } catch (IOException ignored) {}
+          }
+        }
+
+        if (shouldKeepRunning()) {
+          ThreadUtil.interruptableSleep(TimeUnit.SECONDS.toMillis(3));
+        }
+      }
+
+      Log.i(TAG, "Exiting");
+    }
+
+    private void sendIp() throws IOException {
+      client = new Socket();
+      client.bind(null);
+      client.connect(new InetSocketAddress(serverHostAddress, port), 10000);
+      handler.sendEmptyMessage(message);
+      Log.i(TAG, "Done!!");
+      isRunning = false;
+    }
+
+    private void getIp() throws IOException {
+      serverSocket = new ServerSocket(port);
+      while (shouldKeepRunning() && !serverSocket.isClosed()) {
+        Log.i(TAG, "Waiting for client socket accept...");
+        try (Socket socket = serverSocket.accept()) {
+          Log.i(TAG, "Client connected, obtaining IP address");
+          String peerHostAddress = socket.getInetAddress().getHostAddress();
+          handler.sendMessage(handler.obtainMessage(message, peerHostAddress));
+        } catch (IOException e) {
+          if (isRunning) {
+            Log.i(TAG, "Error connecting with client or server socket closed.", e);
+          } else {
+            Log.i(TAG, "Server shutting down...");
+          }
+        }
+      }
+    }
+
+    public void shutdown() {
+      isRunning = false;
+      try {
+        if (client != null) {
+          client.close();
+        }
+
+        if (serverSocket != null) {
+          serverSocket.close();
+        }
+      } catch (IOException e) {
+        Log.w(TAG, "Error shutting down", e);
+      }
+      interrupt();
+    }
+
+    private boolean shouldKeepRunning() {
+      return !isInterrupted() && isRunning;
+    }
+  }
+}
diff --git a/device-transfer/lib/src/main/java/org/signal/devicetransfer/ServerTask.java b/device-transfer/lib/src/main/java/org/signal/devicetransfer/ServerTask.java
new file mode 100644
index 0000000000..ad3b2dc18e
--- /dev/null
+++ b/device-transfer/lib/src/main/java/org/signal/devicetransfer/ServerTask.java
@@ -0,0 +1,22 @@
+package org.signal.devicetransfer;
+
+import android.content.Context;
+
+import androidx.annotation.NonNull;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Serializable;
+
+/**
+ * Self-contained chunk of code to run once the {@link DeviceTransferServer} has a
+ * connected {@link DeviceTransferClient}.
+ */
+public interface ServerTask extends Serializable {
+
+  /**
+   * @param context     Android context, mostly like the foreground transfer service
+   * @param inputStream Input stream associated with socket connected to remote client.
+   */
+  void run(@NonNull Context context, @NonNull InputStream inputStream) throws IOException;
+}
diff --git a/device-transfer/lib/src/main/java/org/signal/devicetransfer/ShutdownCallback.java b/device-transfer/lib/src/main/java/org/signal/devicetransfer/ShutdownCallback.java
new file mode 100644
index 0000000000..5d27b28c2d
--- /dev/null
+++ b/device-transfer/lib/src/main/java/org/signal/devicetransfer/ShutdownCallback.java
@@ -0,0 +1,10 @@
+package org.signal.devicetransfer;
+
+/**
+ * Allow {@link DeviceTransferClient} or {@link DeviceTransferServer} to indicate to the
+ * {@link DeviceToDeviceTransferService} that an internal issue caused a shutdown and the
+ * service should stop as well.
+ */
+public interface ShutdownCallback {
+  void shutdown();
+}
diff --git a/device-transfer/lib/src/main/java/org/signal/devicetransfer/TransferMode.java b/device-transfer/lib/src/main/java/org/signal/devicetransfer/TransferMode.java
new file mode 100644
index 0000000000..9f2b767ef4
--- /dev/null
+++ b/device-transfer/lib/src/main/java/org/signal/devicetransfer/TransferMode.java
@@ -0,0 +1,12 @@
+package org.signal.devicetransfer;
+
+public enum TransferMode {
+  PERMISSIONS,
+  UNAVAILABLE,
+  FAILED,
+  READY,
+  STARTING_UP,
+  DISCOVERY,
+  NETWORK_CONNECTED,
+  SERVICE_CONNECTED
+}
diff --git a/device-transfer/lib/src/main/java/org/signal/devicetransfer/WifiDirect.java b/device-transfer/lib/src/main/java/org/signal/devicetransfer/WifiDirect.java
new file mode 100644
index 0000000000..05dbb02616
--- /dev/null
+++ b/device-transfer/lib/src/main/java/org/signal/devicetransfer/WifiDirect.java
@@ -0,0 +1,416 @@
+package org.signal.devicetransfer;
+
+import android.Manifest;
+import android.annotation.SuppressLint;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.pm.PackageManager;
+import android.net.NetworkInfo;
+import android.net.wifi.WifiManager;
+import android.net.wifi.WpsInfo;
+import android.net.wifi.p2p.WifiP2pConfig;
+import android.net.wifi.p2p.WifiP2pDevice;
+import android.net.wifi.p2p.WifiP2pInfo;
+import android.net.wifi.p2p.WifiP2pManager;
+import android.net.wifi.p2p.nsd.WifiP2pDnsSdServiceInfo;
+import android.net.wifi.p2p.nsd.WifiP2pDnsSdServiceRequest;
+import android.os.Build;
+import android.os.HandlerThread;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.WorkerThread;
+import androidx.core.content.ContextCompat;
+
+import org.signal.core.util.ThreadUtil;
+import org.signal.core.util.concurrent.SignalExecutors;
+import org.signal.core.util.logging.Log;
+import org.signal.devicetransfer.WifiDirectUnavailableException.Reason;
+
+import java.util.Collections;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Provide the ability to spin up a WiFi Direct network, advertise a network service,
+ * discover a network service, and then connect two devices.
+ */
+@SuppressLint("MissingPermission")
+public final class WifiDirect {
+
+  private static final String TAG = Log.tag(WifiDirect.class);
+
+  private static final IntentFilter intentFilter = new IntentFilter() {{
+    addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION);
+    addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION);
+    addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION);
+    addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION);
+  }};
+
+  public static final String SERVICE_INSTANCE = "_devicetransfer._signal.org";
+  public static final String SERVICE_REG_TYPE = "_presence._tcp";
+
+  private final Context                      context;
+  private       WifiDirectConnectionListener connectionListener;
+  private       WifiDirectCallbacks          wifiDirectCallbacks;
+  private       WifiP2pManager               manager;
+  private       WifiP2pManager.Channel       channel;
+  private       WifiP2pDnsSdServiceRequest   serviceRequest;
+  private final HandlerThread                wifiDirectCallbacksHandler;
+
+  /**
+   * Determine the ability to use WiFi Direct by checking if the device supports WiFi Direct
+   * and the appropriate permissions have been granted.
+   */
+  public static @NonNull AvailableStatus getAvailability(@NonNull Context context) {
+    if (!context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_WIFI_DIRECT)) {
+      Log.i(TAG, "Feature not available");
+      return AvailableStatus.FEATURE_NOT_AVAILABLE;
+    }
+
+    WifiManager wifiManager = ContextCompat.getSystemService(context, WifiManager.class);
+    if (wifiManager == null) {
+      Log.i(TAG, "WifiManager not available");
+      return AvailableStatus.WIFI_MANAGER_NOT_AVAILABLE;
+    }
+
+    if (Build.VERSION.SDK_INT >= 23 && context.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
+      Log.i(TAG, "Fine location permission required");
+      return AvailableStatus.FINE_LOCATION_PERMISSION_NOT_GRANTED;
+    }
+
+    return Build.VERSION.SDK_INT <= 23 || wifiManager.isP2pSupported() ? AvailableStatus.AVAILABLE
+                                                                       : AvailableStatus.WIFI_DIRECT_NOT_AVAILABLE;
+  }
+
+  public WifiDirect(@NonNull Context context) {
+    this.context                    = context.getApplicationContext();
+    this.wifiDirectCallbacksHandler = SignalExecutors.getAndStartHandlerThread("wifi-direct-cb");
+  }
+
+  /**
+   * Initialize {@link WifiP2pManager} and {@link WifiP2pManager.Channel} needed to interact
+   * with the Android WiFi Direct APIs. This should have a matching call to {@link #shutdown()} to
+   * release the various resources used to establish and maintain a WiFi Direct network.
+   */
+  public synchronized void initialize(@NonNull WifiDirectConnectionListener connectionListener) throws WifiDirectUnavailableException {
+    if (isInitialized()) {
+      Log.w(TAG, "Already initialized, do not need to initialize twice");
+      return;
+    }
+
+    this.connectionListener = connectionListener;
+
+    manager = ContextCompat.getSystemService(context, WifiP2pManager.class);
+    if (manager == null) {
+      Log.i(TAG, "Unable to get WifiP2pManager");
+      shutdown();
+      throw new WifiDirectUnavailableException(Reason.WIFI_P2P_MANAGER);
+    }
+
+    wifiDirectCallbacks = new WifiDirectCallbacks();
+    channel             = manager.initialize(context, wifiDirectCallbacksHandler.getLooper(), wifiDirectCallbacks);
+    if (channel == null) {
+      Log.i(TAG, "Unable to initialize channel");
+      shutdown();
+      throw new WifiDirectUnavailableException(Reason.CHANNEL_INITIALIZATION);
+    }
+
+    context.registerReceiver(wifiDirectCallbacks, intentFilter);
+  }
+
+  /**
+   * Clears and releases WiFi Direct resources that may have been created or in use. Also
+   * shuts down the WiFi Direct related {@link HandlerThread}.
+   * <p>
+   * <i>Note: After this call, the instance is no longer usable and an entirely new one will need to
+   * be created.</i>
+   */
+  public synchronized void shutdown() {
+    Log.d(TAG, "Shutting down");
+
+    connectionListener = null;
+
+    if (manager != null) {
+      retry(manager::clearServiceRequests, "clear service requests");
+      retry(manager::stopPeerDiscovery, "stop peer discovery");
+      retry(manager::clearLocalServices, "clear local services");
+      manager = null;
+    }
+
+    if (channel != null) {
+      channel.close();
+      channel = null;
+    }
+
+    if (wifiDirectCallbacks != null) {
+      context.unregisterReceiver(wifiDirectCallbacks);
+      wifiDirectCallbacks = null;
+    }
+
+    wifiDirectCallbacksHandler.quit();
+    wifiDirectCallbacksHandler.interrupt();
+  }
+
+  /**
+   * Start advertising a transfer service that other devices can search for and decide
+   * to connect to. Call on an appropriate thread as this method synchronously calls WiFi Direct
+   * methods.
+   */
+  @WorkerThread
+  public synchronized void startDiscoveryService() throws WifiDirectUnavailableException {
+    ensureInitialized();
+
+    WifiP2pDnsSdServiceInfo serviceInfo = WifiP2pDnsSdServiceInfo.newInstance(SERVICE_INSTANCE, SERVICE_REG_TYPE, Collections.emptyMap());
+
+    SyncActionListener addLocalServiceListener = new SyncActionListener("add local service");
+    manager.addLocalService(channel, serviceInfo, addLocalServiceListener);
+
+    SyncActionListener discoverPeersListener = new SyncActionListener("discover peers");
+    manager.discoverPeers(channel, discoverPeersListener);
+
+    if (!addLocalServiceListener.successful() || !discoverPeersListener.successful()) {
+      throw new WifiDirectUnavailableException(Reason.SERVICE_START);
+    }
+  }
+
+  /**
+   * Start searching for a transfer service being advertised by another device. Call on an
+   * appropriate thread as this method synchronously calls WiFi Direct methods.
+   */
+  @WorkerThread
+  public synchronized void discoverService() throws WifiDirectUnavailableException {
+    ensureInitialized();
+
+    if (serviceRequest != null) {
+      Log.w(TAG, "Discover service already called and active.");
+      return;
+    }
+
+    WifiP2pManager.DnsSdTxtRecordListener txtListener = (fullDomain, record, device) -> {};
+
+    WifiP2pManager.DnsSdServiceResponseListener serviceListener = (instanceName, registrationType, sourceDevice) -> {
+      if (SERVICE_INSTANCE.equals(instanceName)) {
+        Log.d(TAG, "Service found!");
+        if (connectionListener != null) {
+          connectionListener.onServiceDiscovered(sourceDevice);
+        }
+      } else {
+        Log.d(TAG, "Found unusable service, ignoring.");
+      }
+    };
+
+    manager.setDnsSdResponseListeners(channel, serviceListener, txtListener);
+
+    serviceRequest = WifiP2pDnsSdServiceRequest.newInstance();
+
+    SyncActionListener addServiceListener = new SyncActionListener("add service request");
+    manager.addServiceRequest(channel, serviceRequest, addServiceListener);
+
+    SyncActionListener startDiscovery = new SyncActionListener("discover services");
+    manager.discoverServices(channel, startDiscovery);
+
+    if (!addServiceListener.successful() || !startDiscovery.successful()) {
+      manager.removeServiceRequest(channel, serviceRequest, null);
+      serviceRequest = null;
+      throw new WifiDirectUnavailableException(Reason.SERVICE_DISCOVERY_START);
+    }
+  }
+
+  /**
+   * Establish a WiFi Direct network by connecting to the given device address (MAC). An
+   * address can be found by using {@link #discoverService()}.
+   *
+   * @param deviceAddress Device MAC address to establish a connection with
+   */
+  public synchronized void connect(@NonNull String deviceAddress) throws WifiDirectUnavailableException {
+    ensureInitialized();
+
+    WifiP2pConfig config = new WifiP2pConfig();
+    config.deviceAddress = deviceAddress;
+    config.wps.setup     = WpsInfo.PBC;
+
+    if (serviceRequest != null) {
+      manager.removeServiceRequest(channel, serviceRequest, LoggingActionListener.message("Remote service request"));
+      serviceRequest = null;
+    }
+
+    SyncActionListener listener = new SyncActionListener("service connect");
+    manager.connect(channel, config, listener);
+
+    if (listener.successful()) {
+      Log.i(TAG, "Successfully connected to service.");
+    } else {
+      throw new WifiDirectUnavailableException(Reason.SERVICE_CONNECT_FAILURE);
+    }
+  }
+
+  private synchronized void retry(@NonNull ManagerRetry retryFunction, @NonNull String message) {
+    int tries = 3;
+
+    while ((tries--) > 0) {
+      SyncActionListener listener = new SyncActionListener(message);
+      retryFunction.call(channel, listener);
+      if (listener.successful()) {
+        return;
+      }
+      ThreadUtil.sleep(TimeUnit.SECONDS.toMillis(1));
+    }
+  }
+
+  private synchronized boolean isInitialized() {
+    return manager != null && channel != null;
+  }
+
+  private synchronized boolean isNotInitialized() {
+    return manager == null || channel == null;
+  }
+
+  private void ensureInitialized() throws WifiDirectUnavailableException {
+    if (isNotInitialized()) {
+      Log.w(TAG, "WiFi Direct has not been initialized.");
+      throw new WifiDirectUnavailableException(Reason.SERVICE_NOT_INITIALIZED);
+    }
+  }
+
+  private interface ManagerRetry {
+    void call(@NonNull WifiP2pManager.Channel a, @NonNull WifiP2pManager.ActionListener b);
+  }
+
+  private class WifiDirectCallbacks extends BroadcastReceiver implements WifiP2pManager.ChannelListener, WifiP2pManager.ConnectionInfoListener {
+    @Override
+    public void onReceive(@NonNull Context context, @NonNull Intent intent) {
+      String action = intent.getAction();
+      if (action != null) {
+        switch (action) {
+          case WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION:
+            WifiP2pDevice localDevice = intent.getParcelableExtra(WifiP2pManager.EXTRA_WIFI_P2P_DEVICE);
+            if (localDevice != null && connectionListener != null) {
+              connectionListener.onLocalDeviceChanged(localDevice);
+            }
+            break;
+          case WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION:
+            if (isNotInitialized()) {
+              Log.w(TAG, "WiFi P2P broadcast connection changed action without being initialized.");
+              return;
+            }
+
+            NetworkInfo networkInfo = intent.getParcelableExtra(WifiP2pManager.EXTRA_NETWORK_INFO);
+
+            if (networkInfo == null) {
+              Log.w(TAG, "WiFi P2P broadcast connection changed action with null network info.");
+              return;
+            }
+
+            if (networkInfo.isConnected()) {
+              Log.i(TAG, "Connected to P2P network, requesting connection information.");
+              manager.requestConnectionInfo(channel, this);
+            } else {
+              Log.i(TAG, "Disconnected from P2P network");
+              if (connectionListener != null) {
+                connectionListener.onNetworkDisconnected();
+              }
+            }
+            break;
+        }
+      }
+    }
+
+    @Override
+    public void onConnectionInfoAvailable(@NonNull WifiP2pInfo info) {
+      Log.i(TAG, "Connection information available. group_formed: " + info.groupFormed + " group_owner: " + info.isGroupOwner);
+      if (connectionListener != null) {
+        connectionListener.onNetworkConnected(info);
+      }
+    }
+
+    @Override
+    public void onChannelDisconnected() {
+      if (connectionListener != null) {
+        connectionListener.onNetworkFailure();
+      }
+    }
+  }
+
+  /**
+   * Provide a synchronous way to talking to Android's WiFi Direct code.
+   */
+  private static class SyncActionListener extends LoggingActionListener {
+
+    private final CountDownLatch sync;
+
+    private volatile int failureReason = -1;
+
+    public SyncActionListener(@NonNull String message) {
+      super(message);
+      this.sync = new CountDownLatch(1);
+    }
+
+    @Override
+    public void onSuccess() {
+      super.onSuccess();
+      sync.countDown();
+    }
+
+    @Override
+    public void onFailure(int reason) {
+      super.onFailure(reason);
+      failureReason = reason;
+      sync.countDown();
+    }
+
+    public boolean successful() {
+      try {
+        sync.await();
+      } catch (InterruptedException ie) {
+        throw new AssertionError(ie);
+      }
+      return failureReason < 0;
+    }
+  }
+
+  private static class LoggingActionListener implements WifiP2pManager.ActionListener {
+
+    private final String message;
+
+    public static @NonNull LoggingActionListener message(@Nullable String message) {
+      return new LoggingActionListener(message);
+    }
+
+    public LoggingActionListener(@Nullable String message) {
+      this.message = message;
+    }
+
+    @Override
+    public void onSuccess() {
+      Log.i(TAG, message + " success");
+    }
+
+    @Override
+    public void onFailure(int reason) {
+      Log.w(TAG, message + " failure_reason: " + reason);
+    }
+  }
+
+  public enum AvailableStatus {
+    FEATURE_NOT_AVAILABLE,
+    WIFI_MANAGER_NOT_AVAILABLE,
+    FINE_LOCATION_PERMISSION_NOT_GRANTED,
+    WIFI_DIRECT_NOT_AVAILABLE,
+    AVAILABLE
+  }
+
+  public interface WifiDirectConnectionListener {
+    void onLocalDeviceChanged(@NonNull WifiP2pDevice localDevice);
+
+    void onServiceDiscovered(@NonNull WifiP2pDevice serviceDevice);
+
+    void onNetworkConnected(@NonNull WifiP2pInfo info);
+
+    void onNetworkDisconnected();
+
+    void onNetworkFailure();
+  }
+}
diff --git a/device-transfer/lib/src/main/java/org/signal/devicetransfer/WifiDirectUnavailableException.java b/device-transfer/lib/src/main/java/org/signal/devicetransfer/WifiDirectUnavailableException.java
new file mode 100644
index 0000000000..e1cdd81f3c
--- /dev/null
+++ b/device-transfer/lib/src/main/java/org/signal/devicetransfer/WifiDirectUnavailableException.java
@@ -0,0 +1,29 @@
+package org.signal.devicetransfer;
+
+import androidx.annotation.NonNull;
+
+/**
+ * Represents the various type of failure with creating a WiFi Direction connection.
+ */
+public final class WifiDirectUnavailableException extends Exception {
+
+  private final Reason reason;
+
+  public WifiDirectUnavailableException(@NonNull Reason reason) {
+    this.reason = reason;
+  }
+
+  public @NonNull Reason getReason() {
+    return reason;
+  }
+
+  public enum Reason {
+    WIFI_P2P_MANAGER,
+    CHANNEL_INITIALIZATION,
+    SERVICE_DISCOVERY_START,
+    SERVICE_START,
+    SERVICE_CONNECT_FAILURE,
+    SERVICE_CREATE_GROUP,
+    SERVICE_NOT_INITIALIZED
+  }
+}
diff --git a/device-transfer/lib/witness-verifications.gradle b/device-transfer/lib/witness-verifications.gradle
new file mode 100644
index 0000000000..cf44f2ad36
--- /dev/null
+++ b/device-transfer/lib/witness-verifications.gradle
@@ -0,0 +1,105 @@
+// Auto-generated, use ./gradlew calculateChecksums to regenerate
+
+dependencyVerification {
+    verify = [
+
+        ['androidx.activity:activity:1.0.0',
+         'd1bc9842455c2e534415d88c44df4d52413b478db9093a1ba36324f705f44c3d'],
+
+        ['androidx.annotation:annotation-experimental:1.0.0',
+         'b219d2b568e7e4ba534e09f8c2fd242343df6ccbdfbbe938846f5d740e6b0b11'],
+
+        ['androidx.annotation:annotation:1.1.0',
+         'd38d63edb30f1467818d50aaf05f8a692dea8b31392a049bfa991b159ad5b692'],
+
+        ['androidx.appcompat:appcompat-resources:1.2.0',
+         'c470297c03ff3de1c3d15dacf0be0cae63abc10b52f021dd07ae28daa3100fe5'],
+
+        ['androidx.appcompat:appcompat:1.2.0',
+         '3d2131a55a61a777322e2126e0018011efa6339e53b44153eb651b16020cca70'],
+
+        ['androidx.arch.core:core-common:2.1.0',
+         'fe1237bf029d063e7f29fe39aeaf73ef74c8b0a3658486fc29d3c54326653889'],
+
+        ['androidx.arch.core:core-runtime:2.0.0',
+         '87e65fc767c712b437649c7cee2431ebb4bed6daef82e501d4125b3ed3f65f8e'],
+
+        ['androidx.cardview:cardview:1.0.0',
+         '1193c04c22a3d6b5946dae9f4e8c59d6adde6a71b6bd5d87fb99d82dda1afec7'],
+
+        ['androidx.collection:collection:1.1.0',
+         '632a0e5407461de774409352940e292a291037724207a787820c77daf7d33b72'],
+
+        ['androidx.coordinatorlayout:coordinatorlayout:1.1.0',
+         '44a9e30abf56af1025c52a0af506fee9c4131aa55efda52f9fd9451211c5e8cb'],
+
+        ['androidx.core:core:1.3.0',
+         '1c6b6626f15185d8f4bc7caac759412a1ab6e851ecf7526387d9b9fadcabdb63'],
+
+        ['androidx.cursoradapter:cursoradapter:1.0.0',
+         'a81c8fe78815fa47df5b749deb52727ad11f9397da58b16017f4eb2c11e28564'],
+
+        ['androidx.customview:customview:1.0.0',
+         '20e5b8f6526a34595a604f56718da81167c0b40a7a94a57daa355663f2594df2'],
+
+        ['androidx.drawerlayout:drawerlayout:1.0.0',
+         '9402442cdc5a43cf62fb14f8cf98c63342d4d9d9b805c8033c6cf7e802749ac1'],
+
+        ['androidx.fragment:fragment:1.1.0',
+         'a14c8b8f2153f128e800fbd266a6beab1c283982a29ec570d2cc05d307d81496'],
+
+        ['androidx.interpolator:interpolator:1.0.0',
+         '33193135a64fe21fa2c35eec6688f1a76e512606c0fc83dc1b689e37add7732a'],
+
+        ['androidx.lifecycle:lifecycle-common:2.1.0',
+         '76db6be533bd730fb361c2feb12a2c26d9952824746847da82601ef81f082643'],
+
+        ['androidx.lifecycle:lifecycle-livedata-core:2.0.0',
+         'fde334ec7e22744c0f5bfe7caf1a84c9d717327044400577bdf9bd921ec4f7bc'],
+
+        ['androidx.lifecycle:lifecycle-livedata:2.0.0',
+         'c82609ced8c498f0a701a30fb6771bb7480860daee84d82e0a81ee86edf7ba39'],
+
+        ['androidx.lifecycle:lifecycle-runtime:2.1.0',
+         'e5173897b965e870651e83d9d5af1742d3f532d58863223a390ce3a194c8312b'],
+
+        ['androidx.lifecycle:lifecycle-viewmodel:2.1.0',
+         'ba55fb7ac1b2828d5327cda8acf7085d990b2b4c43ef336caa67686249b8523d'],
+
+        ['androidx.loader:loader:1.0.0',
+         '11f735cb3b55c458d470bed9e25254375b518b4b1bad6926783a7026db0f5025'],
+
+        ['androidx.recyclerview:recyclerview:1.1.0',
+         'f0d2b5a67d0a91ee1b1c73ef2b636a81f3563925ddd15a1d4e1c41ec28de7a4f'],
+
+        ['androidx.savedstate:savedstate:1.0.0',
+         '2510a5619c37579c9ce1a04574faaf323cd0ffe2fc4e20fa8f8f01e5bb402e83'],
+
+        ['androidx.transition:transition:1.2.0',
+         'a1e059b3bc0b43a58dec0efecdcaa89c82d2bca552ea5bacf6656c46e853157e'],
+
+        ['androidx.vectordrawable:vectordrawable-animated:1.1.0',
+         '76da2c502371d9c38054df5e2b248d00da87809ed058f3363eae87ce5e2403f8'],
+
+        ['androidx.vectordrawable:vectordrawable:1.1.0',
+         '46fd633ac01b49b7fcabc263bf098c5a8b9e9a69774d234edcca04fb02df8e26'],
+
+        ['androidx.versionedparcelable:versionedparcelable:1.1.0',
+         '9a1d77140ac222b7866b5054ee7d159bc1800987ed2d46dd6afdd145abb710c1'],
+
+        ['androidx.viewpager2:viewpager2:1.0.0',
+         'e95c0031d4cc247cd48196c6287e58d2cee54d9c79b85afea7c90920330275af'],
+
+        ['androidx.viewpager:viewpager:1.0.0',
+         '147af4e14a1984010d8f155e5e19d781f03c1d70dfed02a8e0d18428b8fc8682'],
+
+        ['com.google.android.material:material:1.2.1',
+         'd3d0cc776f2341da8e572586c7d390a5b356ce39a0deb2768071dc40b364ac80'],
+
+        ['com.google.protobuf:protobuf-javalite:3.10.0',
+         '215a94dbe100130295906b531bb72a26965c7ac8fcd9a75bf8054a8ac2abf4b4'],
+
+        ['org.greenrobot:eventbus:3.0.0',
+         '180d4212467df06f2fbc9c8d8a2984533ac79c87769ad883bc421612f0b4e17c'],
+    ]
+}
diff --git a/settings.gradle b/settings.gradle
index fe78b99a25..f34675477d 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -5,11 +5,16 @@ include ':paging'
 include ':paging-app'
 include ':core-util'
 include ':video'
+include ':device-transfer'
+include ':device-transfer-app'
 
 project(':app').name = 'Signal-Android'
 project(':paging').projectDir = file('paging/lib')
 project(':paging-app').projectDir = file('paging/app')
 
+project(':device-transfer').projectDir = file('device-transfer/lib')
+project(':device-transfer-app').projectDir = file('device-transfer/app')
+
 project(':libsignal-service').projectDir = file('libsignal/service')
 
 rootProject.name='Signal'