diff --git a/contexthub/aidl/Android.bp b/contexthub/aidl/Android.bp
new file mode 100644
index 0000000..2086508
--- /dev/null
+++ b/contexthub/aidl/Android.bp
@@ -0,0 +1,28 @@
+// Copyright 2021 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.
+
+aidl_interface {
+    name: "android.hardware.contexthub",
+    vendor_available: true,
+    srcs: ["android/hardware/contexthub/*.aidl"],
+    stability: "vintf",
+    backend: {
+        java: {
+            sdk_version: "module_current",
+        },
+        ndk: {
+            apps_enabled: false,
+        },
+    },
+}
diff --git a/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/AsyncEventType.aidl b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/AsyncEventType.aidl
new file mode 100644
index 0000000..8e0ff89
--- /dev/null
+++ b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/AsyncEventType.aidl
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.contexthub;
+@Backing(type="int") @VintfStability
+enum AsyncEventType {
+  RESTARTED = 1,
+}
diff --git a/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/ContextHubInfo.aidl b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/ContextHubInfo.aidl
new file mode 100644
index 0000000..e573556
--- /dev/null
+++ b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/ContextHubInfo.aidl
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.contexthub;
+@VintfStability
+parcelable ContextHubInfo {
+  String name;
+  String vendor;
+  String toolchain;
+  int id;
+  float peakMips;
+  int maxSupportedMessageLengthBytes;
+  long chrePlatformId;
+  byte chreApiMajorVersion;
+  byte chreApiMinorVersion;
+  char chrePatchVersion;
+  String[] supportedPermissions;
+}
diff --git a/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/ContextHubMessage.aidl b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/ContextHubMessage.aidl
new file mode 100644
index 0000000..e38c251
--- /dev/null
+++ b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/ContextHubMessage.aidl
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.contexthub;
+@VintfStability
+parcelable ContextHubMessage {
+  long nanoappId;
+  char hostEndPoint;
+  int messageType;
+  byte[] messageBody;
+  String[] permissions;
+}
diff --git a/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/IContextHub.aidl b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/IContextHub.aidl
new file mode 100644
index 0000000..cb31c84
--- /dev/null
+++ b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/IContextHub.aidl
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.contexthub;
+@VintfStability
+interface IContextHub {
+  List<android.hardware.contexthub.ContextHubInfo> getContextHubs();
+  boolean loadNanoapp(in int contextHubId, in android.hardware.contexthub.NanoappBinary appBinary, in int transactionId);
+  boolean unloadNanoapp(in int contextHubId, in long appId, in int transactionId);
+  boolean disableNanoapp(in int contextHubId, in long appId, in int transactionId);
+  boolean enableNanoapp(in int contextHubId, in long appId, in int transactionId);
+  void onSettingChanged(in android.hardware.contexthub.Setting setting, in boolean enabled);
+  boolean queryNanoapps(in int contextHubId);
+  boolean registerCallback(in int contextHubId, in android.hardware.contexthub.IContextHubCallback cb);
+  boolean sendMessageToHub(in int contextHubId, in android.hardware.contexthub.ContextHubMessage message);
+}
diff --git a/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/IContextHubCallback.aidl b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/IContextHubCallback.aidl
new file mode 100644
index 0000000..f81f7cf
--- /dev/null
+++ b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/IContextHubCallback.aidl
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.contexthub;
+@VintfStability
+interface IContextHubCallback {
+  void handleNanoappInfo(in android.hardware.contexthub.NanoappInfo[] appInfo);
+  void handleContextHubMessage(in android.hardware.contexthub.ContextHubMessage msg, in String[] msgContentPerms);
+  void handleContextHubAsyncEvent(in android.hardware.contexthub.AsyncEventType evt);
+  void handleTransactionResult(in int transactionId, in boolean success);
+}
diff --git a/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/NanoappBinary.aidl b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/NanoappBinary.aidl
new file mode 100644
index 0000000..d53b28f
--- /dev/null
+++ b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/NanoappBinary.aidl
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.contexthub;
+@VintfStability
+parcelable NanoappBinary {
+  long nanoappId;
+  int nanoappVersion;
+  int flags;
+  byte targetChreApiMajorVersion;
+  byte targetChreApiMinorVersion;
+  byte[] customBinary;
+  const int FLAG_SIGNED = 1;
+  const int FLAG_ENCRYPTED = 2;
+  const int FLAG_TCM_CAPABLE = 4;
+}
diff --git a/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/NanoappInfo.aidl b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/NanoappInfo.aidl
new file mode 100644
index 0000000..ea7825a
--- /dev/null
+++ b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/NanoappInfo.aidl
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.contexthub;
+@VintfStability
+parcelable NanoappInfo {
+  long nanoappId;
+  int nanoappVersion;
+  boolean enabled;
+  String[] permissions;
+}
diff --git a/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/Setting.aidl b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/Setting.aidl
new file mode 100644
index 0000000..41bc9ae
--- /dev/null
+++ b/contexthub/aidl/aidl_api/android.hardware.contexthub/current/android/hardware/contexthub/Setting.aidl
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.contexthub;
+@Backing(type="byte") @VintfStability
+enum Setting {
+  LOCATION = 1,
+  WIFI_MAIN = 2,
+  WIFI_SCANNING = 3,
+  AIRPLANE_MODE = 4,
+  MICROPHONE = 5,
+}
diff --git a/contexthub/aidl/android/hardware/contexthub/AsyncEventType.aidl b/contexthub/aidl/android/hardware/contexthub/AsyncEventType.aidl
new file mode 100644
index 0000000..d884c9c
--- /dev/null
+++ b/contexthub/aidl/android/hardware/contexthub/AsyncEventType.aidl
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2021 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 android.hardware.contexthub;
+
+@VintfStability
+@Backing(type="int")
+enum AsyncEventType {
+    /** An event where the Context Hub has restarted (e.g. due to a crash). */
+    RESTARTED = 1,
+}
diff --git a/contexthub/aidl/android/hardware/contexthub/ContextHubInfo.aidl b/contexthub/aidl/android/hardware/contexthub/ContextHubInfo.aidl
new file mode 100644
index 0000000..c0fa702
--- /dev/null
+++ b/contexthub/aidl/android/hardware/contexthub/ContextHubInfo.aidl
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2021 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 android.hardware.contexthub;
+
+@VintfStability
+parcelable ContextHubInfo {
+    /** Descriptive name of the Context Hub */
+    String name;
+
+    /** The vendor e.g. "Google" */
+    String vendor;
+
+    /** Toolchain that describes the binary architecture eg: "gcc ARM" */
+    String toolchain;
+
+    /** A unique ID for this Context Hub */
+    int id;
+
+    /** Peak MIPs this platform can deliver */
+    float peakMips;
+
+    /** The maximum length in bytes of the message that can be sent to the Context Hub. */
+    int maxSupportedMessageLengthBytes;
+
+    /**
+     * Machine-readable CHRE platform ID, returned to nanoapps in the CHRE API
+     * function call chreGetPlatformId(). This field pairs with
+     * chreApiMajorVersion, chreApiMinorVersion, and chrePatchVersion to fully
+     * specify the CHRE implementation version. See also the CHRE API header
+     * file chre/version.h.
+     */
+    long chrePlatformId;
+
+    /**
+     * The version of the CHRE implementation returned to nanoApps in the CHRE
+     *  API function call chreGetVersion(). The major and minor version specify
+     * the implemented version of the CHRE API, while the patch version
+     * describes the implementation version within the scope of the platform
+     * ID. See also the CHRE API header file chre/version.h.
+     */
+    byte chreApiMajorVersion;
+    byte chreApiMinorVersion;
+    char chrePatchVersion;
+
+    /**
+     * A list of Android permissions this Context Hub support for nanoapps to enforce host endpoints
+     * are granted in order to communicate with them.
+     */
+    String[] supportedPermissions;
+}
diff --git a/contexthub/aidl/android/hardware/contexthub/ContextHubMessage.aidl b/contexthub/aidl/android/hardware/contexthub/ContextHubMessage.aidl
new file mode 100644
index 0000000..867da2f
--- /dev/null
+++ b/contexthub/aidl/android/hardware/contexthub/ContextHubMessage.aidl
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2021 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 android.hardware.contexthub;
+
+@VintfStability
+parcelable ContextHubMessage {
+    /** The unique identifier of the nanoapp. */
+    long nanoappId;
+
+    /**
+     * The identifier of the host client that is sending/receiving this message.
+     *
+     * There are two reserved values of the host endpoint that has a specific meaning:
+     * 1) BROADCAST = 0xFFFF: see CHRE_HOST_ENDPOINT_BROADCAST in
+     *    system/chre/chre_api/include/chre_api/chre/event.h for details.
+     * 2) UNSPECIFIED = 0xFFFE: see CHRE_HOST_ENDPOINT_UNSPECIFIED in
+     *    system/chre/chre_api/include/chre_api/chre/event.h for details.
+     */
+    char hostEndPoint;
+
+    /** The type of this message */
+    int messageType;
+
+    /** The payload containing the message */
+    byte[] messageBody;
+
+    /**
+     * The list of Android permissions held by the sending nanoapp at the time
+     * the message was sent.
+     *
+     * The framework MUST drop messages to host apps that don't have a superset
+     * of the permissions that the sending nanoapp is using.
+     */
+    String[] permissions;
+}
diff --git a/contexthub/aidl/android/hardware/contexthub/IContextHub.aidl b/contexthub/aidl/android/hardware/contexthub/IContextHub.aidl
new file mode 100644
index 0000000..e820cbf
--- /dev/null
+++ b/contexthub/aidl/android/hardware/contexthub/IContextHub.aidl
@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2021 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 android.hardware.contexthub;
+
+import android.hardware.contexthub.ContextHubInfo;
+import android.hardware.contexthub.ContextHubMessage;
+import android.hardware.contexthub.IContextHubCallback;
+import android.hardware.contexthub.NanoappBinary;
+import android.hardware.contexthub.Setting;
+
+@VintfStability
+interface IContextHub {
+    /**
+     * Enumerates all available Context Hubs.
+     *
+     * @return A list of ContextHubInfo describing all Context Hubs.
+     */
+    List<ContextHubInfo> getContextHubs();
+
+    /**
+     * Loads a nanoapp, and invokes the nanoapp's initialization "start()" entrypoint.
+     *
+     * The return value of this method only indicates that the request has been accepted.
+     * If true is returned, the Context Hub must handle an asynchronous result using the
+     * the handleTransactionResult() callback.
+     *
+     * Depending on the implementation, nanoapp loaded via this API may or may
+     * not persist across reboots of the hub. If they do persist, the
+     * implementation must initially place nanoapp in the disabled state upon a
+     * reboot, and not start them until a call is made to enableNanoapp(). In
+     * this case, the app must also be unloaded upon a factory reset of the
+     * device.
+     *
+     * Loading a nanoapp must not take more than 30 seconds.
+     *
+     * @param contextHubId The identifier of the Context Hub
+     * @param appBinary The nanoapp binary with header
+     * @param transactionId The transaction ID associated with this request
+     *
+     * @return The return code
+     */
+    boolean loadNanoapp(in int contextHubId, in NanoappBinary appBinary, in int transactionId);
+
+    /**
+     * Invokes the nanoapp's deinitialization "end()" entrypoint, and unloads the nanoapp.
+     *
+     * The return value of this method only indicates that the request has been accepted.
+     * If true is returned, the Context Hub must handle an asynchronous result using the
+     * the handleTransactionResult() callback.
+     *
+     * Unloading a nanoapp must not take more than 5 seconds.
+     *
+     * @param contextHubId The identifier of the Context Hub
+     * @param appId The unique ID of the nanoapp
+     * @param transactionId The transaction ID associated with this request
+     *
+     * @return The return code
+     */
+    boolean unloadNanoapp(in int contextHubId, in long appId, in int transactionId);
+
+    /**
+     * Disables a nanoapp by invoking the nanoapp's "end()" entrypoint, but does not unload the
+     * nanoapp.
+     *
+     * The return value of this method only indicates that the request has been accepted.
+     * If true is returned, the Context Hub must handle an asynchronous result using the
+     * the handleTransactionResult() callback.
+     *
+     * Disabling a nanoapp must not take more than 5 seconds.
+     *
+     * @param contextHubId The identifier of the Context Hub
+     * @param appId The unique ID of the nanoapp
+     * @param transactionId The transaction ID associated with this request
+     *
+     * @return The return code
+     */
+    boolean disableNanoapp(in int contextHubId, in long appId, in int transactionId);
+
+    /**
+     * Enables a nanoapp by invoking the nanoapp's initialization "start()" entrypoint.
+     *
+     * The return value of this method only indicates that the request has been accepted.
+     * If true is returned, the Context Hub must handle an asynchronous result using the
+     * the handleTransactionResult() callback.
+     *
+     * Enabling a nanoapp must not take more than 5 seconds.
+     *
+     * @param contextHubId The identifier of the Context Hub
+     * @param appId appIdentifier returned by the HAL
+     * @param message   message to be sent
+     *
+     * @return true on success
+     */
+    boolean enableNanoapp(in int contextHubId, in long appId, in int transactionId);
+
+    /**
+     * Notification sent by the framework to indicate that the user has changed a setting.
+     *
+     * @param setting User setting that has been modified
+     * @param enabled true if the setting has been enabled, false otherwise
+     */
+    void onSettingChanged(in Setting setting, in boolean enabled);
+
+    /**
+     * Queries for a list of loaded nanoapps on a Context Hub.
+     *
+     * If this method succeeds, the result of the query must be delivered through the
+     * handleNanoappInfo() callback.
+     *
+     * @param contextHubId The identifier of the Context Hub
+     *
+     * @return true on success
+     */
+    boolean queryNanoapps(in int contextHubId);
+
+    /**
+     * Register a callback for the HAL implementation to send asynchronous messages to the service
+     * from a Context hub. There can only be one callback registered for a single Context Hub ID.
+     *
+     * A call to this function when a callback has already been registered must override the
+     * previous registration.
+     *
+     * @param contextHubId The identifier of the Context Hub
+     * @param callback an implementation of the IContextHubCallbacks
+     *
+     * @return true on success
+     *
+     */
+    boolean registerCallback(in int contextHubId, in IContextHubCallback cb);
+
+    /**
+     * Sends a message targeted to a nanoapp to the Context Hub.
+     *
+     * @param contextHubId The identifier of the Context Hub
+     * @param message The message to be sent
+     *
+     * @return true on success
+     */
+    boolean sendMessageToHub(in int contextHubId, in ContextHubMessage message);
+}
diff --git a/contexthub/aidl/android/hardware/contexthub/IContextHubCallback.aidl b/contexthub/aidl/android/hardware/contexthub/IContextHubCallback.aidl
new file mode 100644
index 0000000..e385d48
--- /dev/null
+++ b/contexthub/aidl/android/hardware/contexthub/IContextHubCallback.aidl
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2021 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 android.hardware.contexthub;
+
+import android.hardware.contexthub.AsyncEventType;
+import android.hardware.contexthub.ContextHubMessage;
+import android.hardware.contexthub.NanoappInfo;
+
+@VintfStability
+interface IContextHubCallback {
+    /**
+     * This callback is passed by the Contexthub service to the HAL
+     * implementation to allow the HAL to send information about the
+     * currently loaded and active nanoapps on the hub.
+     *
+     * @param appInfo vector of HubAppinfo structure for each nanoApp
+     *                on the hub that can be enabled, disabled and
+     *                unloaded by the service. Any nanoApps that cannot
+     *                be controlled by the service must not be reported.
+     *                All nanoApps that can be controlled by the service
+     *                must be reported.
+     */
+    void handleNanoappInfo(in NanoappInfo[] appInfo);
+
+    /**
+     * This callback is passed by the Contexthub service to the HAL
+     * implementation to allow the HAL to send asynchronous messages back
+     * to the service and registered clients of the ContextHub service.
+     *
+     * @param msg             message that should be delivered to host app
+     *                        clients
+     * @param msgContentPerms list of Android permissions that cover the
+     *                        contents of the message being sent from the app.
+     *                        This is different from the permissions stored
+     *                        inside of ContextHubMsg in that these must be a
+     *                        subset of those permissions and are meant to
+     *                        assist in properly attributing the message
+     *                        contents when delivering to a ContextHub service
+     *                        client.
+     */
+    void handleContextHubMessage(in ContextHubMessage msg, in String[] msgContentPerms);
+
+    /**
+     * This callback is passed by the Contexthub service to the HAL
+     * implementation to allow the HAL to send an asynchronous event
+     * to the ContextHub service.
+     *
+     * @param evt event being sent from the contexthub
+     *
+     */
+    void handleContextHubAsyncEvent(in AsyncEventType evt);
+
+    /**
+     * This callback is passed by the Contexthub service to the HAL
+     * implementation to allow the HAL to send the response for a
+     * transaction.
+     *
+     * @param transactionId The ID of the transaction associated with this callback
+     * @param success true if the transaction succeeded, false otherwise
+     *
+     */
+    void handleTransactionResult(in int transactionId, in boolean success);
+}
diff --git a/contexthub/aidl/android/hardware/contexthub/NanoappBinary.aidl b/contexthub/aidl/android/hardware/contexthub/NanoappBinary.aidl
new file mode 100644
index 0000000..c677ca6
--- /dev/null
+++ b/contexthub/aidl/android/hardware/contexthub/NanoappBinary.aidl
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2021 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 android.hardware.contexthub;
+
+@VintfStability
+parcelable NanoappBinary {
+    /** Indicates that the nanoapp is securely signed (e.g. for production) */
+    const int FLAG_SIGNED = 1 << 0;
+    const int FLAG_ENCRYPTED = 1 << 1;
+    /** Indicates that the nanoapp can run on a Context Hub's TCM memory region */
+    const int FLAG_TCM_CAPABLE = 1 << 2;
+
+    /**
+     * The unique identifier of the nanoapp for the entire system. See chreNanoappInfo in
+     * system/chre/chre_api/include/chre_api/chre/event.h for the convention for choosing
+     * this ID.
+     */
+    long nanoappId;
+
+    /** The version of the nanoapp. */
+    int nanoappVersion;
+
+    /** The nanoapp flags, comprised of the bitmasks defined in FLAG_* constants above. */
+    int flags;
+
+    /**
+     * The version of the CHRE API that this nanoapp was compiled against. See
+     * the CHRE API header file chre/version.h for more information. The hub
+     * implementation must use this to confirm compatibility before loading
+     * this nanoapp.
+     */
+    byte targetChreApiMajorVersion;
+    byte targetChreApiMinorVersion;
+
+    /**
+     * Implementation-specific binary nanoapp data. This does not include the
+     * common nanoapp header that contains the app ID, etc., as this data is
+     * explicitly passed through the other fields in this struct.
+     */
+    byte[] customBinary;
+}
diff --git a/contexthub/aidl/android/hardware/contexthub/NanoappInfo.aidl b/contexthub/aidl/android/hardware/contexthub/NanoappInfo.aidl
new file mode 100644
index 0000000..9991dc8
--- /dev/null
+++ b/contexthub/aidl/android/hardware/contexthub/NanoappInfo.aidl
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2021 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 android.hardware.contexthub;
+
+@VintfStability
+parcelable NanoappInfo {
+    /** The unique identifier of the nanoapp. */
+    long nanoappId;
+
+    /** The version of the nanoapp */
+    int nanoappVersion;
+
+    /** True if this nanoapp is in a running state, false otherwise */
+    boolean enabled;
+
+    /**
+     * The list of Android permissions used by this nanoapp. This list MUST
+     * correspond to the permissions required for an equivalent Android app to
+     * sample similar signals through the Android framework.
+     *
+     * For example, if a nanoapp used location-based signals, the permissions
+     * list MUST contains android.permission.ACCESS_FINE_LOCATION and
+     * android.permission.ACCESS_BACKGROUND_LOCATION. If it were to also use
+     * audio data, it would require adding android.permission.RECORD_AUDIO to
+     * this list.
+     */
+    String[] permissions;
+}
diff --git a/contexthub/aidl/android/hardware/contexthub/Setting.aidl b/contexthub/aidl/android/hardware/contexthub/Setting.aidl
new file mode 100644
index 0000000..f2e55db
--- /dev/null
+++ b/contexthub/aidl/android/hardware/contexthub/Setting.aidl
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2021 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 android.hardware.contexthub;
+
+/**
+ * Used to indicate the type of user setting that has changed.
+ */
+@VintfStability
+@Backing(type="byte")
+enum Setting {
+    LOCATION = 1,
+    /**
+     * The main WiFi toggle in the Android settings for WiFi connectivity.
+     */
+    WIFI_MAIN,
+    /**
+     * The "Wi-Fi scanning" setting for location scans.
+     */
+    WIFI_SCANNING,
+    AIRPLANE_MODE,
+    /**
+     * Indicates if the microphone access is available for CHRE. Microphone
+     * access is disabled if the user has turned off the microphone as a
+     * privacy setting, in which case audio data cannot be used and propagated
+     * by CHRE.
+     */
+    MICROPHONE,
+}
diff --git a/contexthub/aidl/default/Android.bp b/contexthub/aidl/default/Android.bp
new file mode 100644
index 0000000..269057a
--- /dev/null
+++ b/contexthub/aidl/default/Android.bp
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2021 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 {
+    // See: http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // all of the 'license_kinds' from "hardware_interfaces_license"
+    // to get the below license kinds:
+    //   SPDX-license-identifier-Apache-2.0
+    default_applicable_licenses: ["hardware_interfaces_license"],
+}
+
+cc_library_static {
+    name: "libcontexthubexampleimpl",
+    vendor: true,
+    shared_libs: [
+        "libbase",
+        "libbinder_ndk",
+        "android.hardware.contexthub-V1-ndk",
+    ],
+    export_include_dirs: ["include"],
+    srcs: [
+        "ContextHub.cpp",
+    ],
+    visibility: [
+        ":__subpackages__",
+        "//hardware/interfaces/tests/extension/contexthub:__subpackages__",
+    ],
+}
+
+cc_binary {
+    name: "android.hardware.contexthub-service.example",
+    relative_install_path: "hw",
+    init_rc: ["contexthub-default.rc"],
+    vintf_fragments: ["contexthub-default.xml"],
+    vendor: true,
+    shared_libs: [
+        "libbase",
+        "libbinder_ndk",
+        "android.hardware.contexthub-V1-ndk",
+    ],
+    static_libs: [
+        "libcontexthubexampleimpl",
+    ],
+    srcs: ["main.cpp"],
+}
diff --git a/contexthub/aidl/default/ContextHub.cpp b/contexthub/aidl/default/ContextHub.cpp
new file mode 100644
index 0000000..1b56608
--- /dev/null
+++ b/contexthub/aidl/default/ContextHub.cpp
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+
+#include "contexthub-impl/ContextHub.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace contexthub {
+
+// TODO(b/194285834): Implement AIDL HAL
+
+::ndk::ScopedAStatus ContextHub::getContextHubs(
+        std::vector<ContextHubInfo>* /* out_contextHubInfos */) {
+    return ndk::ScopedAStatus::ok();
+}
+
+::ndk::ScopedAStatus ContextHub::loadNanoapp(int32_t /* in_contextHubId */,
+                                             const NanoappBinary& /* in_appBinary */,
+                                             int32_t /* in_transactionId */,
+                                             bool* /* _aidl_return */) {
+    return ndk::ScopedAStatus::ok();
+}
+
+::ndk::ScopedAStatus ContextHub::unloadNanoapp(int32_t /* in_contextHubId */,
+                                               int64_t /* in_appId */,
+                                               int32_t /* in_transactionId */,
+                                               bool* /* _aidl_return */) {
+    return ndk::ScopedAStatus::ok();
+}
+
+::ndk::ScopedAStatus ContextHub::disableNanoapp(int32_t /* in_contextHubId */,
+                                                int64_t /* in_appId */,
+                                                int32_t /* in_transactionId */,
+                                                bool* /* _aidl_return */) {
+    return ndk::ScopedAStatus::ok();
+}
+
+::ndk::ScopedAStatus ContextHub::enableNanoapp(int32_t /* in_contextHubId */,
+                                               int64_t /* in_appId */,
+                                               int32_t /* in_transactionId */,
+                                               bool* /* _aidl_return */) {
+    return ndk::ScopedAStatus::ok();
+}
+
+::ndk::ScopedAStatus ContextHub::onSettingChanged(Setting /* in_setting */, bool /*in_enabled */) {
+    return ndk::ScopedAStatus::ok();
+}
+
+::ndk::ScopedAStatus ContextHub::queryNanoapps(int32_t /* in_contextHubId */,
+                                               bool* /* _aidl_return */) {
+    return ndk::ScopedAStatus::ok();
+}
+
+::ndk::ScopedAStatus ContextHub::registerCallback(
+        int32_t /* in_contextHubId */, const std::shared_ptr<IContextHubCallback>& /* in_cb */,
+        bool* /* _aidl_return */) {
+    return ndk::ScopedAStatus::ok();
+}
+
+::ndk::ScopedAStatus ContextHub::sendMessageToHub(int32_t /* in_contextHubId */,
+                                                  const ContextHubMessage& /* in_message */,
+                                                  bool* /* _aidl_return */) {
+    return ndk::ScopedAStatus::ok();
+}
+
+}  // namespace contexthub
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
diff --git a/contexthub/aidl/default/contexthub-default.rc b/contexthub/aidl/default/contexthub-default.rc
new file mode 100644
index 0000000..a6a6d2a
--- /dev/null
+++ b/contexthub/aidl/default/contexthub-default.rc
@@ -0,0 +1,4 @@
+service vendor.contexthub-default /vendor/bin/hw/android.hardware.contexthub-service.example
+    class hal
+    user context_hub
+    group context_hub
diff --git a/contexthub/aidl/default/contexthub-default.xml b/contexthub/aidl/default/contexthub-default.xml
new file mode 100644
index 0000000..e383c50
--- /dev/null
+++ b/contexthub/aidl/default/contexthub-default.xml
@@ -0,0 +1,7 @@
+<manifest version="1.0" type="device">
+    <hal format="aidl">
+        <name>android.hardware.contexthub</name>
+        <version>1</version>
+        <fqname>IContextHub/default</fqname>
+    </hal>
+</manifest>
diff --git a/contexthub/aidl/default/include/contexthub-impl/ContextHub.h b/contexthub/aidl/default/include/contexthub-impl/ContextHub.h
new file mode 100644
index 0000000..980cee5
--- /dev/null
+++ b/contexthub/aidl/default/include/contexthub-impl/ContextHub.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+
+#pragma once
+
+#include <aidl/android/hardware/contexthub/BnContextHub.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace contexthub {
+
+class ContextHub : public BnContextHub {
+    ::ndk::ScopedAStatus getContextHubs(std::vector<ContextHubInfo>* out_contextHubInfos) override;
+    ::ndk::ScopedAStatus loadNanoapp(int32_t in_contextHubId, const NanoappBinary& in_appBinary,
+                                     int32_t in_transactionId, bool* _aidl_return) override;
+    ::ndk::ScopedAStatus unloadNanoapp(int32_t in_contextHubId, int64_t in_appId,
+                                       int32_t in_transactionId, bool* _aidl_return) override;
+    ::ndk::ScopedAStatus disableNanoapp(int32_t in_contextHubId, int64_t in_appId,
+                                        int32_t in_transactionId, bool* _aidl_return) override;
+    ::ndk::ScopedAStatus enableNanoapp(int32_t in_contextHubId, int64_t in_appId,
+                                       int32_t in_transactionId, bool* _aidl_return) override;
+    ::ndk::ScopedAStatus onSettingChanged(Setting in_setting, bool in_enabled) override;
+    ::ndk::ScopedAStatus queryNanoapps(int32_t in_contextHubId, bool* _aidl_return) override;
+    ::ndk::ScopedAStatus registerCallback(int32_t in_contextHubId,
+                                          const std::shared_ptr<IContextHubCallback>& in_cb,
+                                          bool* _aidl_return) override;
+    ::ndk::ScopedAStatus sendMessageToHub(int32_t in_contextHubId,
+                                          const ContextHubMessage& in_message,
+                                          bool* _aidl_return) override;
+};
+
+}  // namespace contexthub
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
diff --git a/contexthub/aidl/default/main.cpp b/contexthub/aidl/default/main.cpp
new file mode 100644
index 0000000..dc9035f
--- /dev/null
+++ b/contexthub/aidl/default/main.cpp
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+
+#include "contexthub-impl/ContextHub.h"
+
+#include <android-base/logging.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+using aidl::android::hardware::contexthub::ContextHub;
+
+int main() {
+    ABinderProcess_setThreadPoolMaxThreadCount(0);
+
+    // Make a default contexthub service
+    auto vib = ndk::SharedRefBase::make<ContextHub>();
+    const std::string vibName = std::string() + ContextHub::descriptor + "/default";
+    binder_status_t status = AServiceManager_addService(vib->asBinder().get(), vibName.c_str());
+    CHECK(status == STATUS_OK);
+
+    ABinderProcess_joinThreadPool();
+    return EXIT_FAILURE;  // should not reach
+}