diff --git a/automotive/audiocontrol/aidl/vts/VtsHalAudioControlTargetTest.cpp b/automotive/audiocontrol/aidl/vts/VtsHalAudioControlTargetTest.cpp
index f4e3b5a..4e7e963 100644
--- a/automotive/audiocontrol/aidl/vts/VtsHalAudioControlTargetTest.cpp
+++ b/automotive/audiocontrol/aidl/vts/VtsHalAudioControlTargetTest.cpp
@@ -53,17 +53,25 @@
 namespace audiohalcommon = android::hardware::audio::common;
 namespace audiomediacommon = android::media::audio::common;
 
+namespace {
+constexpr int32_t kAidlVersionThree = 3;
+}
+
 class AudioControlAidl : public testing::TestWithParam<std::string> {
   public:
     virtual void SetUp() override {
         audioControl = android::waitForDeclaredService<IAudioControl>(String16(GetParam().c_str()));
         ASSERT_NE(audioControl, nullptr);
+        aidlVersion = audioControl->getInterfaceVersion();
     }
 
     void TearDown() override { audioControl = nullptr; }
 
+    bool isAidlVersionAtleast(int version) const { return aidlVersion >= version; }
+
     sp<IAudioControl> audioControl;
     int32_t capabilities;
+    int32_t aidlVersion;
 };
 
 TEST_P(AudioControlAidl, OnSetFadeTowardsFront) {
@@ -250,6 +258,11 @@
 
 TEST_P(AudioControlAidl, RegisterModuleChangeCallbackTwiceThrowsException) {
     ALOGI("Register Module change callback test");
+    if (!isAidlVersionAtleast(kAidlVersionThree)) {
+        GTEST_SKIP() << "Device does not support the new APIs for module change callback";
+        return;
+    }
+
     // make sure no stale callbacks.
     audioControl->clearModuleChangeCallback();
 
@@ -269,6 +282,11 @@
 
 TEST_P(AudioControlAidl, RegisterModuleChangeNullCallbackThrowsException) {
     ALOGI("Register Module change callback with nullptr test");
+    if (!isAidlVersionAtleast(kAidlVersionThree)) {
+        GTEST_SKIP() << "Device does not support the new APIs for module change callback";
+        return;
+    }
+
     auto status = audioControl->setModuleChangeCallback(nullptr);
     EXPECT_THAT(status.exceptionCode(),
                 AnyOf(Eq(Status::EX_ILLEGAL_ARGUMENT), Eq(Status::EX_UNSUPPORTED_OPERATION)));
diff --git a/identity/aidl/vts/VtsIWritableIdentityCredentialTests.cpp b/identity/aidl/vts/VtsIWritableIdentityCredentialTests.cpp
index 94d4c88..eb74fa2 100644
--- a/identity/aidl/vts/VtsIWritableIdentityCredentialTests.cpp
+++ b/identity/aidl/vts/VtsIWritableIdentityCredentialTests.cpp
@@ -125,7 +125,8 @@
 
     MacedPublicKey macedPublicKey;
     std::vector<uint8_t> attestationKey;
-    result = rpc->generateEcdsaP256KeyPair(/*testMode=*/true, &macedPublicKey, &attestationKey);
+    // Start by RPC version 3, we don't support testMode=true. So just verify testMode=false here.
+    result = rpc->generateEcdsaP256KeyPair(/*testMode=*/false, &macedPublicKey, &attestationKey);
     ASSERT_TRUE(result.isOk()) << result.exceptionCode() << "; " << result.exceptionMessage();
 
     optional<vector<vector<uint8_t>>> remotelyProvisionedCertChain =
@@ -176,7 +177,8 @@
 
     MacedPublicKey macedPublicKey;
     std::vector<uint8_t> attestationKey;
-    result = rpc->generateEcdsaP256KeyPair(/*testMode=*/true, &macedPublicKey, &attestationKey);
+    // Start by RPC version 3, we don't support testMode=true. So just verify testMode=false here.
+    result = rpc->generateEcdsaP256KeyPair(/*testMode=*/false, &macedPublicKey, &attestationKey);
     ASSERT_TRUE(result.isOk()) << result.exceptionCode() << "; " << result.exceptionMessage();
 
     optional<vector<vector<uint8_t>>> remotelyProvisionedCertChain =
diff --git a/tv/input/aidl/android/hardware/tv/input/ITvInputCallback.aidl b/tv/input/aidl/android/hardware/tv/input/ITvInputCallback.aidl
index 5d47317..2c7e32f 100644
--- a/tv/input/aidl/android/hardware/tv/input/ITvInputCallback.aidl
+++ b/tv/input/aidl/android/hardware/tv/input/ITvInputCallback.aidl
@@ -30,7 +30,14 @@
     void notify(in TvInputEvent event);
     /**
      * Notifies the client that an TV message event has occurred. For possible event types,
-     * check TvMessageEventType.
+     * check {@link android.hardware.tv.input.TvMessageEventType}.
+     *
+     * The first message in a list of messages contained in a
+     * {@link android.hardware.tv.input.TvMessageEvent} should always have a
+     * {@link android.hardware.tv.input.TvMessage#subType} of "device_id",
+     * otherwise the event is discarded. When the subType of a message is "device_id", the ID of
+     * the device that sent the message should be contained in
+     * {@link android.hardware.tv.input.TvMessage#groupId}
      *
      * @param event Event passed to the client.
      */
diff --git a/tv/input/aidl/android/hardware/tv/input/TvMessage.aidl b/tv/input/aidl/android/hardware/tv/input/TvMessage.aidl
index 88da538..afa48a9 100644
--- a/tv/input/aidl/android/hardware/tv/input/TvMessage.aidl
+++ b/tv/input/aidl/android/hardware/tv/input/TvMessage.aidl
@@ -23,8 +23,13 @@
      */
     const long NO_GROUP_ID = -1;
     /**
-     * Extended data type, like “ATSC A/336 Watermark”, “ATSC_CC”, etc. This is opaque
-     * to the framework.
+     * Extended data type, like “ATSC A/336 Watermark”, “ATSC_CC”, etc. This type is opaque to the
+     * framework except when the subtype is "device_id". If the subtype is "device_id", the ID of
+     * device that sent the message should be contained in {@link #groupId}.
+     *
+     * The first message in a list of messages contained in
+     * {@link android.hardware.tv.input.TvMessageEvent} should always have the subtype "device_id",
+     * otherwise the event is discarded.
      */
     String subType;
     /**
@@ -32,6 +37,9 @@
      * headers and bodies of the same event. For messages that do not have a group, this value
      * should be -1.
      *
+     * If {@link #subType} is "device_id", this value should contain the ID of the device that sent
+     * this message.
+     *
      * As -1 is a reserved value, -1 should not be used as a valid groupId.
      */
     long groupId;