diff --git a/nearby/service/java/com/android/server/nearby/common/bluetooth/fastpair/Event.java b/nearby/service/java/com/android/server/nearby/common/bluetooth/fastpair/Event.java
index 0b50dfd..7a0548b 100644
--- a/nearby/service/java/com/android/server/nearby/common/bluetooth/fastpair/Event.java
+++ b/nearby/service/java/com/android/server/nearby/common/bluetooth/fastpair/Event.java
@@ -133,14 +133,11 @@
             Event that = (Event) o;
             return this.mEventCode == that.getEventCode()
                     && this.mTimestamp == that.getTimestamp()
-                    && (this.mProfile == null
-                        ? that.getProfile() == null : this.mProfile.equals(that.getProfile()))
                     && (this.mBluetoothDevice == null
-                        ? that.getBluetoothDevice() == null :
-                            this.mBluetoothDevice.equals(that.getBluetoothDevice()))
-                    && (this.mException == null
-                        ?  that.getException() == null :
-                            this.mException.equals(that.getException()));
+                    ? that.getBluetoothDevice() == null :
+                    this.mBluetoothDevice.equals(that.getBluetoothDevice()))
+                    && (this.mProfile == null
+                    ? that.getProfile() == null : this.mProfile.equals(that.getProfile()));
         }
         return false;
     }
@@ -150,7 +147,6 @@
         return Objects.hash(mEventCode, mTimestamp, mProfile, mBluetoothDevice, mException);
     }
 
-
     /**
      * Builder
      */
diff --git a/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/BytesTest.java b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/BytesTest.java
new file mode 100644
index 0000000..2e46ef9
--- /dev/null
+++ b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/BytesTest.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.nearby.common.bluetooth.fastpair;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import androidx.test.filters.SdkSuppress;
+
+import junit.framework.TestCase;
+
+import java.nio.ByteOrder;
+import java.util.Arrays;
+
+/**
+ * Unit tests for {@link Bytes}.
+ */
+public class BytesTest extends TestCase {
+
+    private static final Bytes.Value VALUE1 =
+            new Bytes.Value(new byte[]{1, 2}, ByteOrder.BIG_ENDIAN);
+    private static final Bytes.Value VALUE2 =
+            new Bytes.Value(new byte[]{1, 2}, ByteOrder.BIG_ENDIAN);
+    private static final Bytes.Value VALUE3 =
+            new Bytes.Value(new byte[]{1, 3}, ByteOrder.BIG_ENDIAN);
+
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void testEquals_asExpected()  {
+        assertThat(VALUE1.equals(VALUE2)).isTrue();
+    }
+
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void testNotEquals_asExpected()  {
+        assertThat(VALUE1.equals(VALUE3)).isFalse();
+    }
+
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void testGetBytes_asExpected()  {
+        assertThat(Arrays.equals(VALUE1.getBytes(ByteOrder.BIG_ENDIAN), new byte[]{1, 2})).isTrue();
+    }
+
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void testToString()  {
+        assertThat(VALUE1.toString()).isEqualTo("0102");
+    }
+}
diff --git a/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/ConstantsTest.java b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/ConstantsTest.java
index f7ffa24..6684fbc 100644
--- a/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/ConstantsTest.java
+++ b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/ConstantsTest.java
@@ -33,6 +33,8 @@
 import com.android.server.nearby.common.bluetooth.fastpair.Constants.FastPairService.KeyBasedPairingCharacteristic;
 import com.android.server.nearby.common.bluetooth.gatt.BluetoothGattConnection;
 
+import com.google.common.collect.ImmutableList;
+
 import junit.framework.TestCase;
 
 import org.mockito.Mock;
@@ -44,6 +46,8 @@
  */
 public class ConstantsTest extends TestCase {
 
+    private static final int PASSKEY = 32689;
+
     @Mock
     private BluetoothGattConnection mMockGattConnection;
 
@@ -78,4 +82,62 @@
         assertThat(KeyBasedPairingCharacteristic.getId(mMockGattConnection))
                 .isEqualTo(OLD_KEY_BASE_PAIRING_CHARACTERISTICS);
     }
+
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void test_accountKeyCharacteristic_notCrash() throws BluetoothException {
+        Constants.FastPairService.AccountKeyCharacteristic.getId(mMockGattConnection);
+    }
+
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void test_additionalDataCharacteristic_notCrash() throws BluetoothException {
+        Constants.FastPairService.AdditionalDataCharacteristic.getId(mMockGattConnection);
+    }
+
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void test_nameCharacteristic_notCrash() throws BluetoothException {
+        Constants.FastPairService.NameCharacteristic.getId(mMockGattConnection);
+    }
+
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void test_passKeyCharacteristic_encryptDecryptSuccessfully()
+            throws java.security.GeneralSecurityException {
+        byte[] secret = AesEcbSingleBlockEncryption.generateKey();
+
+        Constants.FastPairService.PasskeyCharacteristic.getId(mMockGattConnection);
+        assertThat(
+                Constants.FastPairService.PasskeyCharacteristic.decrypt(
+                        Constants.FastPairService.PasskeyCharacteristic.Type.SEEKER,
+                        secret,
+                        Constants.FastPairService.PasskeyCharacteristic.encrypt(
+                                Constants.FastPairService.PasskeyCharacteristic.Type.SEEKER,
+                                secret,
+                                PASSKEY))
+        ).isEqualTo(PASSKEY);
+    }
+
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void test_beaconActionsCharacteristic_notCrash() throws BluetoothException {
+        Constants.FastPairService.BeaconActionsCharacteristic.getId(mMockGattConnection);
+        for (byte b : ImmutableList.of(
+                (byte) Constants.FastPairService.BeaconActionsCharacteristic.BeaconActionType
+                        .READ_BEACON_PARAMETERS,
+                (byte) Constants.FastPairService.BeaconActionsCharacteristic.BeaconActionType
+                        .READ_PROVISIONING_STATE,
+                (byte) Constants.FastPairService.BeaconActionsCharacteristic.BeaconActionType
+                        .SET_EPHEMERAL_IDENTITY_KEY,
+                (byte) Constants.FastPairService.BeaconActionsCharacteristic.BeaconActionType
+                        .CLEAR_EPHEMERAL_IDENTITY_KEY,
+                (byte) Constants.FastPairService.BeaconActionsCharacteristic.BeaconActionType
+                        .READ_EPHEMERAL_IDENTITY_KEY,
+                (byte) Constants.FastPairService.BeaconActionsCharacteristic.BeaconActionType
+                        .RING,
+                (byte) Constants.FastPairService.BeaconActionsCharacteristic.BeaconActionType
+                        .READ_RINGING_STATE,
+                (byte) Constants.FastPairService.BeaconActionsCharacteristic.BeaconActionType
+                        .UNKNOWN
+        )) {
+            assertThat(Constants.FastPairService.BeaconActionsCharacteristic
+                    .valueOf(b)).isEqualTo(b);
+        }
+    }
 }
diff --git a/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/CreateBondExceptionTest.java b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/CreateBondExceptionTest.java
new file mode 100644
index 0000000..052e696
--- /dev/null
+++ b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/CreateBondExceptionTest.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.nearby.common.bluetooth.fastpair;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import androidx.test.filters.SdkSuppress;
+
+import com.android.server.nearby.common.bluetooth.BluetoothException;
+import com.android.server.nearby.intdefs.FastPairEventIntDefs;
+
+import junit.framework.TestCase;
+
+/**
+ * Unit tests for {@link CreateBondException}.
+ */
+public class CreateBondExceptionTest extends TestCase {
+
+    private static final String FORMAT = "FORMAT";
+    private static final int REASON = 0;
+    private static final CreateBondException EXCEPTION = new CreateBondException(
+            FastPairEventIntDefs.CreateBondErrorCode.INCORRECT_VARIANT, REASON, FORMAT);
+
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void test_getter_asExpected() throws BluetoothException {
+        assertThat(EXCEPTION.getErrorCode()).isEqualTo(
+                FastPairEventIntDefs.CreateBondErrorCode.INCORRECT_VARIANT);
+        assertThat(EXCEPTION.getReason()).isSameInstanceAs(REASON);
+    }
+}
diff --git a/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/DeviceIntentReceiverTest.java b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/DeviceIntentReceiverTest.java
new file mode 100644
index 0000000..94bf111
--- /dev/null
+++ b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/DeviceIntentReceiverTest.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.nearby.common.bluetooth.fastpair;
+
+import static org.mockito.MockitoAnnotations.initMocks;
+
+import android.bluetooth.BluetoothDevice;
+import android.content.Context;
+import android.content.Intent;
+
+import androidx.test.filters.SdkSuppress;
+import androidx.test.platform.app.InstrumentationRegistry;
+
+import junit.framework.TestCase;
+
+import org.mockito.Mock;
+
+/**
+ * Unit tests for {@link DeviceIntentReceiver}.
+ */
+public class DeviceIntentReceiverTest extends TestCase {
+    @Mock Preferences mPreferences;
+    @Mock BluetoothDevice mBluetoothDevice;
+
+    private DeviceIntentReceiver mDeviceIntentReceiver;
+    private Intent mIntent;
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        initMocks(this);
+
+        Context context = InstrumentationRegistry.getInstrumentation().getContext();
+        mDeviceIntentReceiver = DeviceIntentReceiver.oneShotReceiver(
+                context, mPreferences, mBluetoothDevice);
+
+        mIntent = new Intent().putExtra(BluetoothDevice.EXTRA_DEVICE, mBluetoothDevice);
+    }
+
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void test_onReceive_notCrash() throws Exception {
+        mDeviceIntentReceiver.onReceive(mIntent);
+    }
+}
diff --git a/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/EventTest.java b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/EventTest.java
index 28e925f..1b63ad0 100644
--- a/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/EventTest.java
+++ b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/EventTest.java
@@ -58,6 +58,13 @@
                         .setBluetoothDevice(BLUETOOTH_DEVICE)
                         .setProfile(PROFILE)
                         .build();
+        assertThat(event.hasBluetoothDevice()).isTrue();
+        assertThat(event.hasProfile()).isTrue();
+        assertThat(event.isFailure()).isTrue();
+        assertThat(event.toString()).isEqualTo(
+                "Event{eventCode=1120, timestamp=1234, profile=1, "
+                        + "bluetoothDevice=11:22:33:44:55:66, "
+                        + "exception=java.lang.Exception: Test exception}");
 
         Parcel parcel = Parcel.obtain();
         event.writeToParcel(parcel, event.describeContents());
@@ -70,5 +77,8 @@
         assertThat(result.getEventCode()).isEqualTo(event.getEventCode());
         assertThat(result.getBluetoothDevice()).isEqualTo(event.getBluetoothDevice());
         assertThat(result.getProfile()).isEqualTo(event.getProfile());
+        assertThat(result.equals(event)).isTrue();
+
+        assertThat(Event.CREATOR.newArray(10)).isNotEmpty();
     }
 }
diff --git a/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/HandshakeHandlerTest.java b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/HandshakeHandlerTest.java
new file mode 100644
index 0000000..5763d69
--- /dev/null
+++ b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/HandshakeHandlerTest.java
@@ -0,0 +1,493 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.nearby.common.bluetooth.fastpair;
+
+import static com.android.server.nearby.common.bluetooth.fastpair.Constants.BLUETOOTH_ADDRESS_LENGTH;
+import static com.android.server.nearby.common.bluetooth.fastpair.Constants.FastPairService.KeyBasedPairingCharacteristic.ActionOverBleFlag.ADDITIONAL_DATA_CHARACTERISTIC;
+import static com.android.server.nearby.common.bluetooth.fastpair.Constants.FastPairService.KeyBasedPairingCharacteristic.ActionOverBleFlag.DEVICE_ACTION;
+import static com.android.server.nearby.common.bluetooth.fastpair.Constants.FastPairService.KeyBasedPairingCharacteristic.KeyBasedPairingRequestFlag.PROVIDER_INITIATES_BONDING;
+import static com.android.server.nearby.common.bluetooth.fastpair.Constants.FastPairService.KeyBasedPairingCharacteristic.KeyBasedPairingRequestFlag.REQUEST_DEVICE_NAME;
+import static com.android.server.nearby.common.bluetooth.fastpair.Constants.FastPairService.KeyBasedPairingCharacteristic.KeyBasedPairingRequestFlag.REQUEST_DISCOVERABLE;
+import static com.android.server.nearby.common.bluetooth.fastpair.Constants.FastPairService.KeyBasedPairingCharacteristic.KeyBasedPairingRequestFlag.REQUEST_RETROACTIVE_PAIR;
+import static com.android.server.nearby.common.bluetooth.fastpair.Constants.FastPairService.KeyBasedPairingCharacteristic.Request.ADDITIONAL_DATA_TYPE_INDEX;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.junit.Assert.assertThrows;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyLong;
+import static org.mockito.Mockito.inOrder;
+import static org.mockito.Mockito.when;
+
+import android.platform.test.annotations.Presubmit;
+
+import androidx.annotation.Nullable;
+import androidx.core.util.Consumer;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.filters.SdkSuppress;
+import androidx.test.filters.SmallTest;
+
+import com.android.server.nearby.common.bluetooth.BluetoothException;
+import com.android.server.nearby.common.bluetooth.BluetoothGattException;
+import com.android.server.nearby.common.bluetooth.fastpair.Constants.FastPairService.AdditionalDataCharacteristic.AdditionalDataType;
+import com.android.server.nearby.common.bluetooth.fastpair.Constants.FastPairService.KeyBasedPairingCharacteristic.Request;
+import com.android.server.nearby.common.bluetooth.gatt.BluetoothGattConnection;
+import com.android.server.nearby.common.bluetooth.testability.android.bluetooth.BluetoothAdapter;
+import com.android.server.nearby.common.bluetooth.util.BluetoothOperationExecutor;
+import com.android.server.nearby.intdefs.NearbyEventIntDefs;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.io.BaseEncoding;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.InOrder;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import java.security.GeneralSecurityException;
+import java.time.Duration;
+import java.util.Arrays;
+
+/**
+ * Unit tests for {@link HandshakeHandler}.
+ */
+@Presubmit
+@SmallTest
+@RunWith(AndroidJUnit4.class)
+public class HandshakeHandlerTest {
+
+    public static final byte[] PUBLIC_KEY =
+            BaseEncoding.base64().decode(
+                    "d2JTfvfdS6u7LmGfMOmco3C7ra3lW1k17AOly0LrBydDZURacfTY"
+                            + "IMmo5K1ejfD9e8b6qHsDTNzselhifi10kQ==");
+    private static final String SEEKER_ADDRESS = "A1:A2:A3:A4:A5:A6";
+    private static final String PROVIDER_BLE_ADDRESS = "11:22:33:44:55:66";
+    private static final byte[] SHARED_SECRET =
+            BaseEncoding.base16().decode("0123456789ABCDEF0123456789ABCDEF");
+
+    @Mock EventLoggerWrapper mEventLoggerWrapper;
+    @Mock BluetoothGattConnection mBluetoothGattConnection;
+    @Mock BluetoothGattConnection.ChangeObserver mChangeObserver;
+    @Mock private Consumer<Integer> mRescueFromError;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+    }
+
+    @Test
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void handshakeGattError_noRetryError_failed() throws BluetoothException {
+        HandshakeHandler.KeyBasedPairingRequest keyBasedPairingRequest =
+                new HandshakeHandler.KeyBasedPairingRequest.Builder()
+                        .setVerificationData(BluetoothAddress.decode(PROVIDER_BLE_ADDRESS))
+                        .build();
+        BluetoothGattException exception =
+                new BluetoothGattException("Exception for no retry", 257);
+        when(mChangeObserver.waitForUpdate(anyLong())).thenThrow(exception);
+        GattConnectionManager gattConnectionManager =
+                createGattConnectionManager(Preferences.builder(), () -> {});
+        gattConnectionManager.setGattConnection(mBluetoothGattConnection);
+        when(mBluetoothGattConnection.enableNotification(any(), any()))
+                .thenReturn(mChangeObserver);
+        InOrder inOrder = inOrder(mEventLoggerWrapper);
+
+        assertThrows(
+                BluetoothGattException.class,
+                () ->
+                        getHandshakeHandler(gattConnectionManager, address -> address)
+                                .doHandshakeWithRetryAndSignalLostCheck(
+                                        PUBLIC_KEY,
+                                        keyBasedPairingRequest,
+                                        mRescueFromError));
+
+        inOrder.verify(mEventLoggerWrapper).setCurrentEvent(
+                NearbyEventIntDefs.EventCode.SECRET_HANDSHAKE_GATT_COMMUNICATION);
+        inOrder.verify(mEventLoggerWrapper).logCurrentEventFailed(exception);
+        inOrder.verifyNoMoreInteractions();
+    }
+
+    @Test
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void handshakeGattError_retryAndNoCount_throwException() throws BluetoothException {
+        HandshakeHandler.KeyBasedPairingRequest keyBasedPairingRequest =
+                new HandshakeHandler.KeyBasedPairingRequest.Builder()
+                        .setVerificationData(BluetoothAddress.decode(PROVIDER_BLE_ADDRESS))
+                        .build();
+        BluetoothGattException exception = new BluetoothGattException("Exception for retry", 133);
+        when(mChangeObserver.waitForUpdate(anyLong())).thenThrow(exception);
+        GattConnectionManager gattConnectionManager =
+                createGattConnectionManager(Preferences.builder(), () -> {});
+        gattConnectionManager.setGattConnection(mBluetoothGattConnection);
+        when(mBluetoothGattConnection.enableNotification(any(), any()))
+                .thenReturn(mChangeObserver);
+        InOrder inOrder = inOrder(mEventLoggerWrapper);
+
+        HandshakeHandler.HandshakeException handshakeException =
+                assertThrows(
+                        HandshakeHandler.HandshakeException.class,
+                        () -> getHandshakeHandler(gattConnectionManager, address -> address)
+                                .doHandshakeWithRetryAndSignalLostCheck(
+                                        PUBLIC_KEY, keyBasedPairingRequest, mRescueFromError));
+
+        inOrder.verify(mEventLoggerWrapper)
+                .setCurrentEvent(NearbyEventIntDefs.EventCode.SECRET_HANDSHAKE_GATT_COMMUNICATION);
+        inOrder.verify(mEventLoggerWrapper).logCurrentEventFailed(exception);
+        inOrder.verify(mEventLoggerWrapper)
+                .setCurrentEvent(NearbyEventIntDefs.EventCode.SECRET_HANDSHAKE_GATT_COMMUNICATION);
+        inOrder.verify(mEventLoggerWrapper).logCurrentEventFailed(exception);
+        inOrder.verify(mEventLoggerWrapper)
+                .setCurrentEvent(NearbyEventIntDefs.EventCode.SECRET_HANDSHAKE_GATT_COMMUNICATION);
+        inOrder.verify(mEventLoggerWrapper).logCurrentEventFailed(exception);
+        inOrder.verify(mEventLoggerWrapper)
+                .setCurrentEvent(NearbyEventIntDefs.EventCode.SECRET_HANDSHAKE_GATT_COMMUNICATION);
+        inOrder.verify(mEventLoggerWrapper).logCurrentEventFailed(exception);
+        inOrder.verifyNoMoreInteractions();
+        assertThat(handshakeException.getOriginalException()).isEqualTo(exception);
+    }
+
+    @Test
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void handshakeGattError_noRetryOnTimeout_throwException() throws BluetoothException {
+        HandshakeHandler.KeyBasedPairingRequest keyBasedPairingRequest =
+                new HandshakeHandler.KeyBasedPairingRequest.Builder()
+                        .setVerificationData(BluetoothAddress.decode(PROVIDER_BLE_ADDRESS))
+                        .build();
+        BluetoothOperationExecutor.BluetoothOperationTimeoutException exception =
+                new BluetoothOperationExecutor.BluetoothOperationTimeoutException("Test timeout");
+        when(mChangeObserver.waitForUpdate(anyLong())).thenThrow(exception);
+        GattConnectionManager gattConnectionManager =
+                createGattConnectionManager(Preferences.builder(), () -> {});
+        gattConnectionManager.setGattConnection(mBluetoothGattConnection);
+        when(mBluetoothGattConnection.enableNotification(any(), any()))
+                .thenReturn(mChangeObserver);
+        InOrder inOrder = inOrder(mEventLoggerWrapper);
+
+        assertThrows(
+                HandshakeHandler.HandshakeException.class,
+                () ->
+                        new HandshakeHandler(
+                                gattConnectionManager,
+                                PROVIDER_BLE_ADDRESS,
+                                Preferences.builder().setRetrySecretHandshakeTimeout(false).build(),
+                                mEventLoggerWrapper,
+                                address -> address)
+                                .doHandshakeWithRetryAndSignalLostCheck(
+                                        PUBLIC_KEY, keyBasedPairingRequest, mRescueFromError));
+
+        inOrder.verify(mEventLoggerWrapper)
+                .setCurrentEvent(NearbyEventIntDefs.EventCode.SECRET_HANDSHAKE_GATT_COMMUNICATION);
+        inOrder.verify(mEventLoggerWrapper).logCurrentEventFailed(exception);
+        inOrder.verifyNoMoreInteractions();
+    }
+
+    @Test
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void handshakeGattError_signalLost() throws BluetoothException {
+        HandshakeHandler.KeyBasedPairingRequest keyBasedPairingRequest =
+                new HandshakeHandler.KeyBasedPairingRequest.Builder()
+                        .setVerificationData(BluetoothAddress.decode(PROVIDER_BLE_ADDRESS))
+                        .build();
+        BluetoothGattException exception = new BluetoothGattException("Exception for retry", 133);
+        when(mChangeObserver.waitForUpdate(anyLong())).thenThrow(exception);
+        GattConnectionManager gattConnectionManager =
+                createGattConnectionManager(Preferences.builder(), () -> {});
+        gattConnectionManager.setGattConnection(mBluetoothGattConnection);
+        when(mBluetoothGattConnection.enableNotification(any(), any()))
+                .thenReturn(mChangeObserver);
+        InOrder inOrder = inOrder(mEventLoggerWrapper);
+
+        SignalLostException signalLostException =
+                assertThrows(
+                        SignalLostException.class,
+                        () -> getHandshakeHandler(gattConnectionManager, address -> null)
+                                .doHandshakeWithRetryAndSignalLostCheck(
+                                        PUBLIC_KEY, keyBasedPairingRequest, mRescueFromError));
+
+        inOrder.verify(mEventLoggerWrapper)
+                .setCurrentEvent(NearbyEventIntDefs.EventCode.SECRET_HANDSHAKE_GATT_COMMUNICATION);
+        inOrder.verify(mEventLoggerWrapper).logCurrentEventFailed(exception);
+        assertThat(signalLostException).hasCauseThat().isEqualTo(exception);
+    }
+
+    @Test
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void handshakeGattError_addressRotate() throws BluetoothException {
+        HandshakeHandler.KeyBasedPairingRequest keyBasedPairingRequest =
+                new HandshakeHandler.KeyBasedPairingRequest.Builder()
+                        .setVerificationData(BluetoothAddress.decode(PROVIDER_BLE_ADDRESS))
+                        .build();
+        BluetoothGattException exception = new BluetoothGattException("Exception for retry", 133);
+        when(mChangeObserver.waitForUpdate(anyLong())).thenThrow(exception);
+        GattConnectionManager gattConnectionManager =
+                createGattConnectionManager(Preferences.builder(), () -> {});
+        gattConnectionManager.setGattConnection(mBluetoothGattConnection);
+        when(mBluetoothGattConnection.enableNotification(any(), any()))
+                .thenReturn(mChangeObserver);
+        InOrder inOrder = inOrder(mEventLoggerWrapper);
+
+        SignalRotatedException signalRotatedException =
+                assertThrows(
+                        SignalRotatedException.class,
+                        () -> getHandshakeHandler(
+                                gattConnectionManager, address -> "AA:BB:CC:DD:EE:FF")
+                                .doHandshakeWithRetryAndSignalLostCheck(
+                                        PUBLIC_KEY, keyBasedPairingRequest, mRescueFromError));
+
+        inOrder.verify(mEventLoggerWrapper).setCurrentEvent(
+                NearbyEventIntDefs.EventCode.SECRET_HANDSHAKE_GATT_COMMUNICATION);
+        inOrder.verify(mEventLoggerWrapper).logCurrentEventFailed(exception);
+        assertThat(signalRotatedException.getNewAddress()).isEqualTo("AA:BB:CC:DD:EE:FF");
+        assertThat(signalRotatedException).hasCauseThat().isEqualTo(exception);
+    }
+
+    @Test
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void constructBytes_setRetroactiveFlag_decodeCorrectly() throws
+            GeneralSecurityException {
+        HandshakeHandler.KeyBasedPairingRequest keyBasedPairingRequest =
+                new HandshakeHandler.KeyBasedPairingRequest.Builder()
+                        .setVerificationData(BluetoothAddress.decode(PROVIDER_BLE_ADDRESS))
+                        .addFlag(REQUEST_RETROACTIVE_PAIR)
+                        .setSeekerPublicAddress(BluetoothAddress.decode(SEEKER_ADDRESS))
+                        .build();
+
+        byte[] encryptedRawMessage =
+                AesEcbSingleBlockEncryption.encrypt(
+                        SHARED_SECRET, keyBasedPairingRequest.getBytes());
+        HandshakeRequest handshakeRequest =
+                new HandshakeRequest(SHARED_SECRET, encryptedRawMessage);
+
+        assertThat(handshakeRequest.getType())
+                .isEqualTo(HandshakeRequest.Type.KEY_BASED_PAIRING_REQUEST);
+        assertThat(handshakeRequest.requestRetroactivePair()).isTrue();
+        assertThat(handshakeRequest.getVerificationData())
+                .isEqualTo(BluetoothAddress.decode(PROVIDER_BLE_ADDRESS));
+        assertThat(handshakeRequest.getSeekerPublicAddress())
+                .isEqualTo(BluetoothAddress.decode(SEEKER_ADDRESS));
+        assertThat(handshakeRequest.requestDeviceName()).isFalse();
+        assertThat(handshakeRequest.requestDiscoverable()).isFalse();
+        assertThat(handshakeRequest.requestProviderInitialBonding()).isFalse();
+    }
+
+    @Test
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void getTimeout_notOverShortRetryMaxSpentTime_getShort() {
+        Preferences preferences = Preferences.builder().build();
+
+        assertThat(getHandshakeHandler(/* getEnable128BitCustomGattCharacteristicsId= */ true)
+                .getTimeoutMs(
+                        preferences.getSecretHandshakeShortTimeoutRetryMaxSpentTimeMs()
+                                - 1))
+                .isEqualTo(preferences.getSecretHandshakeShortTimeoutMs());
+    }
+
+    @Test
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void getTimeout_overShortRetryMaxSpentTime_getLong() {
+        Preferences preferences = Preferences.builder().build();
+
+        assertThat(getHandshakeHandler(/* getEnable128BitCustomGattCharacteristicsId= */ true)
+                .getTimeoutMs(
+                        preferences.getSecretHandshakeShortTimeoutRetryMaxSpentTimeMs()
+                                + 1))
+                .isEqualTo(preferences.getSecretHandshakeLongTimeoutMs());
+    }
+
+    @Test
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void getTimeout_retryNotEnabled_getOrigin() {
+        Preferences preferences = Preferences.builder().build();
+
+        assertThat(
+                new HandshakeHandler(
+                        createGattConnectionManager(Preferences.builder(), () -> {}),
+                        PROVIDER_BLE_ADDRESS,
+                        Preferences.builder()
+                                .setRetryGattConnectionAndSecretHandshake(false).build(),
+                        mEventLoggerWrapper,
+                        /* fastPairSignalChecker= */ null)
+                        .getTimeoutMs(0))
+                .isEqualTo(Duration.ofSeconds(
+                        preferences.getGattOperationTimeoutSeconds()).toMillis());
+    }
+
+    private GattConnectionManager createGattConnectionManager(
+            Preferences.Builder prefs, ToggleBluetoothTask toggleBluetooth) {
+        return new GattConnectionManager(
+                ApplicationProvider.getApplicationContext(),
+                prefs.build(),
+                new EventLoggerWrapper(null),
+                BluetoothAdapter.getDefaultAdapter(),
+                toggleBluetooth,
+                PROVIDER_BLE_ADDRESS,
+                new TimingLogger("GattConnectionManager", prefs.build()),
+                /* fastPairSignalChecker= */ null,
+                /* setMtu= */ false);
+    }
+
+    private HandshakeHandler getHandshakeHandler(
+            GattConnectionManager gattConnectionManager,
+            @Nullable FastPairConnection.FastPairSignalChecker fastPairSignalChecker) {
+        return new HandshakeHandler(
+                gattConnectionManager,
+                PROVIDER_BLE_ADDRESS,
+                Preferences.builder()
+                        .setGattConnectionAndSecretHandshakeNoRetryGattError(ImmutableSet.of(257))
+                        .setRetrySecretHandshakeTimeout(true)
+                        .build(),
+                mEventLoggerWrapper,
+                fastPairSignalChecker);
+    }
+
+    private HandshakeHandler getHandshakeHandler(
+            boolean getEnable128BitCustomGattCharacteristicsId) {
+        return new HandshakeHandler(
+                createGattConnectionManager(Preferences.builder(), () -> {}),
+                PROVIDER_BLE_ADDRESS,
+                Preferences.builder()
+                        .setGattOperationTimeoutSeconds(5)
+                        .setEnable128BitCustomGattCharacteristicsId(
+                                getEnable128BitCustomGattCharacteristicsId)
+                        .build(),
+                mEventLoggerWrapper,
+                /* fastPairSignalChecker= */ null);
+    }
+
+    private static class HandshakeRequest {
+
+        /**
+         * 16 bytes data: 1-byte for type, 1-byte for flags, 6-bytes for provider's BLE address, 8
+         * bytes optional data.
+         *
+         * @see {go/fast-pair-spec-handshake-message1}
+         */
+        private final byte[] mDecryptedMessage;
+
+        HandshakeRequest(byte[] key, byte[] encryptedPairingRequest)
+                throws GeneralSecurityException {
+            mDecryptedMessage = AesEcbSingleBlockEncryption.decrypt(key, encryptedPairingRequest);
+        }
+
+        /**
+         * Gets the type of this handshake request. Currently, we have 2 types: 0x00 for Key-based
+         * Pairing Request and 0x10 for Action Request.
+         */
+        public Type getType() {
+            return Type.valueOf(mDecryptedMessage[Request.TYPE_INDEX]);
+        }
+
+        /**
+         * Gets verification data of this handshake request.
+         * Currently, we use Provider's BLE address.
+         */
+        public byte[] getVerificationData() {
+            return Arrays.copyOfRange(
+                    mDecryptedMessage,
+                    Request.VERIFICATION_DATA_INDEX,
+                    Request.VERIFICATION_DATA_INDEX + Request.VERIFICATION_DATA_LENGTH);
+        }
+
+        /** Gets Seeker's public address of the handshake request. */
+        public byte[] getSeekerPublicAddress() {
+            return Arrays.copyOfRange(
+                    mDecryptedMessage,
+                    Request.SEEKER_PUBLIC_ADDRESS_INDEX,
+                    Request.SEEKER_PUBLIC_ADDRESS_INDEX + BLUETOOTH_ADDRESS_LENGTH);
+        }
+
+        /** Checks whether the Seeker request discoverability from flags byte. */
+        public boolean requestDiscoverable() {
+            return (getFlags() & REQUEST_DISCOVERABLE) != 0;
+        }
+
+        /**
+         * Checks whether the Seeker requests that the Provider shall initiate bonding from
+         * flags byte.
+         */
+        public boolean requestProviderInitialBonding() {
+            return (getFlags() & PROVIDER_INITIATES_BONDING) != 0;
+        }
+
+        /** Checks whether the Seeker requests that the Provider shall notify the existing name. */
+        public boolean requestDeviceName() {
+            return (getFlags() & REQUEST_DEVICE_NAME) != 0;
+        }
+
+        /** Checks whether this is for retroactively writing account key. */
+        public boolean requestRetroactivePair() {
+            return (getFlags() & REQUEST_RETROACTIVE_PAIR) != 0;
+        }
+
+        /** Gets the flags of this handshake request. */
+        private byte getFlags() {
+            return mDecryptedMessage[Request.FLAGS_INDEX];
+        }
+
+        /** Checks whether the Seeker requests a device action. */
+        public boolean requestDeviceAction() {
+            return (getFlags() & DEVICE_ACTION) != 0;
+        }
+
+        /**
+         * Checks whether the Seeker requests an action which will be followed by an additional
+         * data.
+         */
+        public boolean requestFollowedByAdditionalData() {
+            return (getFlags() & ADDITIONAL_DATA_CHARACTERISTIC) != 0;
+        }
+
+        /** Gets the {@link AdditionalDataType} of this handshake request. */
+        @AdditionalDataType
+        public int getAdditionalDataType() {
+            if (!requestFollowedByAdditionalData()
+                    || mDecryptedMessage.length <= ADDITIONAL_DATA_TYPE_INDEX) {
+                return AdditionalDataType.UNKNOWN;
+            }
+            return mDecryptedMessage[ADDITIONAL_DATA_TYPE_INDEX];
+        }
+
+        /** Enumerates the handshake message types. */
+        public enum Type {
+            KEY_BASED_PAIRING_REQUEST(Request.TYPE_KEY_BASED_PAIRING_REQUEST),
+            ACTION_OVER_BLE(Request.TYPE_ACTION_OVER_BLE),
+            UNKNOWN((byte) 0xFF);
+
+            private final byte mValue;
+
+            Type(byte type) {
+                mValue = type;
+            }
+
+            public static Type valueOf(byte value) {
+                for (Type type : Type.values()) {
+                    if (type.getValue() == value) {
+                        return type;
+                    }
+                }
+                return UNKNOWN;
+            }
+
+            public byte getValue() {
+                return mValue;
+            }
+        }
+    }
+}
diff --git a/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/LtvTest.java b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/LtvTest.java
new file mode 100644
index 0000000..81a5d92
--- /dev/null
+++ b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/fastpair/LtvTest.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.nearby.common.bluetooth.fastpair;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.junit.Assert.assertThrows;
+
+import android.platform.test.annotations.Presubmit;
+
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.filters.SdkSuppress;
+import androidx.test.filters.SmallTest;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * Unit tests for {@link Ltv}.
+ */
+@Presubmit
+@SmallTest
+@RunWith(AndroidJUnit4.class)
+public class LtvTest {
+
+    @Test
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void testParseEmpty_throwsException() throws Ltv.ParseException {
+        assertThrows(Ltv.ParseException.class,
+                () -> Ltv.parse(new byte[]{0}));
+    }
+
+    @Test
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void testParse_finishesSuccessfully() throws Ltv.ParseException {
+        assertThat(Ltv.parse(new byte[]{3, 4, 5, 6})).isNotEmpty();
+    }
+}
diff --git a/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/testability/android/bluetooth/BluetoothGattWrapperTest.java b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/testability/android/bluetooth/BluetoothGattWrapperTest.java
index ef37323..199146d 100644
--- a/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/testability/android/bluetooth/BluetoothGattWrapperTest.java
+++ b/nearby/tests/unit/src/com/android/server/nearby/common/bluetooth/testability/android/bluetooth/BluetoothGattWrapperTest.java
@@ -170,7 +170,7 @@
     @SdkSuppress(minSdkVersion = 32, codeName = "T")
     public void testDisconnect_callsWrapped() {
         doNothing().when(mBluetoothGatt).disconnect();
-        mBluetoothGatt.disconnect();
+        mBluetoothGattWrapper.disconnect();
         verify(mBluetoothGatt).disconnect();
     }
 
@@ -178,7 +178,7 @@
     @SdkSuppress(minSdkVersion = 32, codeName = "T")
     public void testClose_callsWrapped() {
         doNothing().when(mBluetoothGatt).close();
-        mBluetoothGatt.close();
+        mBluetoothGattWrapper.close();
         verify(mBluetoothGatt).close();
     }
 }