diff --git a/nfc/aidl/vts/functional/Android.bp b/nfc/aidl/vts/functional/Android.bp
index 0200860..b865255 100644
--- a/nfc/aidl/vts/functional/Android.bp
+++ b/nfc/aidl/vts/functional/Android.bp
@@ -45,3 +45,45 @@
         "vts",
     ],
 }
+
+cc_test {
+    name: "VtsNfcBehaviorChangesTest",
+    defaults: [
+        "VtsHalTargetTestDefaults",
+        "use_libaidlvintf_gtest_helper_static",
+    ],
+    srcs: [
+        "VtsNfcBehaviorChangesTest.cpp",
+        "CondVar.cpp",
+    ],
+    include_dirs: [
+        "system/nfc/src/gki/common",
+        "system/nfc/src/gki/ulinux",
+        "system/nfc/src/include",
+        "system/nfc/src/nfa/include",
+        "system/nfc/src/nfc/include",
+        "system/nfc/utils/include",
+    ],
+    shared_libs: [
+        "libbinder",
+        "libbinder_ndk",
+        "libnativehelper",
+        "libstatssocket",
+    ],
+    static_libs: [
+        "android.hardware.nfc-V2-ndk",
+        "android.hardware.nfc@1.0",
+        "android.hardware.nfc@1.1",
+        "android.hardware.nfc@1.2",
+        "android_nfc_flags_aconfig_c_lib",
+        "libnfc-nci",
+        "libnfc-nci_flags",
+        "libnfcutils",
+        "libstatslog_nfc",
+        "server_configurable_flags",
+    ],
+    require_root: true,
+    test_suites: [
+        "vts",
+    ],
+}
diff --git a/nfc/aidl/vts/functional/CondVar.cpp b/nfc/aidl/vts/functional/CondVar.cpp
new file mode 100644
index 0000000..59e5b51
--- /dev/null
+++ b/nfc/aidl/vts/functional/CondVar.cpp
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2012 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.
+ */
+
+/*
+ *  Encapsulate a condition variable for thread synchronization.
+ */
+
+#include "CondVar.h"
+
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+#include <errno.h>
+#include <string.h>
+
+using android::base::StringPrintf;
+
+/*******************************************************************************
+**
+** Function:        CondVar
+**
+** Description:     Initialize member variables.
+**
+** Returns:         None.
+**
+*******************************************************************************/
+CondVar::CondVar() {
+    pthread_condattr_t attr;
+    pthread_condattr_init(&attr);
+    pthread_condattr_setclock(&attr, CLOCK_MONOTONIC);
+    memset(&mCondition, 0, sizeof(mCondition));
+    int const res = pthread_cond_init(&mCondition, &attr);
+    if (res) {
+        LOG(ERROR) << StringPrintf("CondVar::CondVar: fail init; error=0x%X", res);
+    }
+}
+
+/*******************************************************************************
+**
+** Function:        ~CondVar
+**
+** Description:     Cleanup all resources.
+**
+** Returns:         None.
+**
+*******************************************************************************/
+CondVar::~CondVar() {
+    int const res = pthread_cond_destroy(&mCondition);
+    if (res) {
+        LOG(ERROR) << StringPrintf("CondVar::~CondVar: fail destroy; error=0x%X", res);
+    }
+}
+
+/*******************************************************************************
+**
+** Function:        wait
+**
+** Description:     Block the caller and wait for a condition.
+**
+** Returns:         None.
+**
+*******************************************************************************/
+void CondVar::wait(std::mutex& mutex) {
+    int const res = pthread_cond_wait(&mCondition, mutex.native_handle());
+    if (res) {
+        LOG(ERROR) << StringPrintf("CondVar::wait: fail wait; error=0x%X", res);
+    }
+}
+
+/*******************************************************************************
+**
+** Function:        wait
+**
+** Description:     Block the caller and wait for a condition.
+**                  millisec: Timeout in milliseconds.
+**
+** Returns:         True if wait is successful; false if timeout occurs.
+**
+*******************************************************************************/
+bool CondVar::wait(std::mutex& mutex, long millisec) {
+    bool retVal = false;
+    struct timespec absoluteTime;
+
+    if (clock_gettime(CLOCK_MONOTONIC, &absoluteTime) == -1) {
+        LOG(ERROR) << StringPrintf("CondVar::wait: fail get time; errno=0x%X", errno);
+    } else {
+        absoluteTime.tv_sec += millisec / 1000;
+        long ns = absoluteTime.tv_nsec + ((millisec % 1000) * 1000000);
+        if (ns > 1000000000) {
+            absoluteTime.tv_sec++;
+            absoluteTime.tv_nsec = ns - 1000000000;
+        } else
+            absoluteTime.tv_nsec = ns;
+    }
+
+    int waitResult = pthread_cond_timedwait(&mCondition, mutex.native_handle(), &absoluteTime);
+    if ((waitResult != 0) && (waitResult != ETIMEDOUT))
+        LOG(ERROR) << StringPrintf("CondVar::wait: fail timed wait; error=0x%X", waitResult);
+    retVal = (waitResult == 0);  // waited successfully
+    return retVal;
+}
+
+/*******************************************************************************
+**
+** Function:        notifyOne
+**
+** Description:     Unblock the waiting thread.
+**
+** Returns:         None.
+**
+*******************************************************************************/
+void CondVar::notifyOne() {
+    int const res = pthread_cond_signal(&mCondition);
+    if (res) {
+        LOG(ERROR) << StringPrintf("CondVar::notifyOne: fail signal; error=0x%X", res);
+    }
+}
diff --git a/nfc/aidl/vts/functional/CondVar.h b/nfc/aidl/vts/functional/CondVar.h
new file mode 100644
index 0000000..5e0dcf7
--- /dev/null
+++ b/nfc/aidl/vts/functional/CondVar.h
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2012 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.
+ */
+
+/*
+ *  Encapsulate a condition variable for thread synchronization.
+ */
+
+#pragma once
+#include <pthread.h>
+
+#include <mutex>
+
+class CondVar {
+  public:
+    /*******************************************************************************
+    **
+    ** Function:        CondVar
+    **
+    ** Description:     Initialize member variables.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    CondVar();
+
+    /*******************************************************************************
+    **
+    ** Function:        ~CondVar
+    **
+    ** Description:     Cleanup all resources.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    ~CondVar();
+
+    /*******************************************************************************
+    **
+    ** Function:        wait
+    **
+    ** Description:     Block the caller and wait for a condition.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    void wait(std::mutex& mutex);
+
+    /*******************************************************************************
+    **
+    ** Function:        wait
+    **
+    ** Description:     Block the caller and wait for a condition.
+    **                  millisec: Timeout in milliseconds.
+    **
+    ** Returns:         True if wait is successful; false if timeout occurs.
+    **
+    *******************************************************************************/
+    bool wait(std::mutex& mutex, long millisec);
+
+    /*******************************************************************************
+    **
+    ** Function:        notifyOne
+    **
+    ** Description:     Unblock the waiting thread.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    void notifyOne();
+
+  private:
+    pthread_cond_t mCondition;
+};
diff --git a/nfc/aidl/vts/functional/SyncEvent.h b/nfc/aidl/vts/functional/SyncEvent.h
new file mode 100644
index 0000000..352a549
--- /dev/null
+++ b/nfc/aidl/vts/functional/SyncEvent.h
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2012 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.
+ */
+
+/*
+ *  Synchronize two or more threads using a condition variable and a mutex.
+ */
+#pragma once
+#include <mutex>
+
+#include "CondVar.h"
+
+class SyncEvent {
+  public:
+    /*******************************************************************************
+    **
+    ** Function:        ~SyncEvent
+    **
+    ** Description:     Cleanup all resources.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    ~SyncEvent() {}
+
+    /*******************************************************************************
+    **
+    ** Function:        start
+    **
+    ** Description:     Start a synchronization operation.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    void start() { mMutex.lock(); }
+
+    /*******************************************************************************
+    **
+    ** Function:        wait
+    **
+    ** Description:     Block the thread and wait for the event to occur.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    void wait() { mCondVar.wait(mMutex); }
+
+    /*******************************************************************************
+    **
+    ** Function:        wait
+    **
+    ** Description:     Block the thread and wait for the event to occur.
+    **                  millisec: Timeout in milliseconds.
+    **
+    ** Returns:         True if wait is successful; false if timeout occurs.
+    **
+    *******************************************************************************/
+    bool wait(long millisec) {
+        bool retVal = mCondVar.wait(mMutex, millisec);
+        return retVal;
+    }
+
+    /*******************************************************************************
+    **
+    ** Function:        notifyOne
+    **
+    ** Description:     Notify a blocked thread that the event has occurred.
+    *Unblocks it.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    void notifyOne() { mCondVar.notifyOne(); }
+
+    /*******************************************************************************
+    **
+    ** Function:        end
+    **
+    ** Description:     End a synchronization operation.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    void end() { mMutex.unlock(); }
+
+  private:
+    CondVar mCondVar;
+    std::mutex mMutex;
+};
+
+/*****************************************************************************/
+/*****************************************************************************/
+
+/*****************************************************************************
+**
+**  Name:           SyncEventGuard
+**
+**  Description:    Automatically start and end a synchronization event.
+**
+*****************************************************************************/
+class SyncEventGuard {
+  public:
+    /*******************************************************************************
+    **
+    ** Function:        SyncEventGuard
+    **
+    ** Description:     Start a synchronization operation.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    SyncEventGuard(SyncEvent& event) : mEvent(event) {
+        event.start();  // automatically start operation
+    };
+
+    /*******************************************************************************
+    **
+    ** Function:        ~SyncEventGuard
+    **
+    ** Description:     End a synchronization operation.
+    **
+    ** Returns:         None.
+    **
+    *******************************************************************************/
+    ~SyncEventGuard() {
+        mEvent.end();  // automatically end operation
+    };
+
+  private:
+    SyncEvent& mEvent;
+};
diff --git a/nfc/aidl/vts/functional/VtsNfcBehaviorChangesTest.cpp b/nfc/aidl/vts/functional/VtsNfcBehaviorChangesTest.cpp
new file mode 100644
index 0000000..0b73cc9
--- /dev/null
+++ b/nfc/aidl/vts/functional/VtsNfcBehaviorChangesTest.cpp
@@ -0,0 +1,223 @@
+/*
+ * Copyright (C) 2024 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.
+ */
+
+#define LOG_TAG "nfc_behavior_changes_test"
+
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+#include <android/binder_process.h>
+#include <gtest/gtest.h>
+
+#include <chrono>
+#include <future>
+
+#include "NfcAdaptation.h"
+#include "SyncEvent.h"
+#include "nci_defs.h"
+#include "nfa_api.h"
+#include "nfa_ee_api.h"
+
+using android::base::StringPrintf;
+
+static SyncEvent sNfaEnableEvent;  // event for NFA_Enable()
+static SyncEvent sNfaVsCommand;    // event for VS commands
+static SyncEvent sNfaEnableDisablePollingEvent;
+static SyncEvent sNfaPowerChangeEvent;
+static bool sIsNfaEnabled;
+static tNFA_STATUS sVSCmdStatus;
+
+static void nfaDeviceManagementCallback(uint8_t dmEvent, tNFA_DM_CBACK_DATA* eventData) {
+    LOG(DEBUG) << StringPrintf("%s: enter; event=0x%X", __func__, dmEvent);
+
+    switch (dmEvent) {
+        case NFA_DM_ENABLE_EVT: /* Result of NFA_Enable */
+        {
+            SyncEventGuard guard(sNfaEnableEvent);
+            LOG(DEBUG) << StringPrintf("%s: NFA_DM_ENABLE_EVT; status=0x%X", __func__,
+                                       eventData->status);
+            sIsNfaEnabled = eventData->status == NFA_STATUS_OK;
+            sNfaEnableEvent.notifyOne();
+        } break;
+
+        case NFA_DM_DISABLE_EVT: /* Result of NFA_Disable */
+        {
+            SyncEventGuard guard(sNfaEnableEvent);
+            LOG(DEBUG) << StringPrintf("%s: NFA_DM_DISABLE_EVT; status=0x%X", __func__,
+                                       eventData->status);
+            sIsNfaEnabled = eventData->status == NFA_STATUS_OK;
+            sNfaEnableEvent.notifyOne();
+        } break;
+
+        case NFA_DM_PWR_MODE_CHANGE_EVT: {
+            SyncEventGuard guard(sNfaPowerChangeEvent);
+            LOG(DEBUG) << StringPrintf(
+                    "%s: NFA_DM_PWR_MODE_CHANGE_EVT: status=0x%X, power_mode=0x%X", __func__,
+                    eventData->status, eventData->power_mode.power_mode);
+
+            sNfaPowerChangeEvent.notifyOne();
+
+        } break;
+    }
+}
+
+static void nfaConnectionCallback(uint8_t connEvent, tNFA_CONN_EVT_DATA* eventData) {
+    LOG(DEBUG) << StringPrintf("%s: event= %u", __func__, connEvent);
+
+    switch (connEvent) {
+        case NFA_LISTEN_DISABLED_EVT: {
+            SyncEventGuard guard(sNfaEnableDisablePollingEvent);
+            sNfaEnableDisablePollingEvent.notifyOne();
+        } break;
+
+        case NFA_LISTEN_ENABLED_EVT: {
+            SyncEventGuard guard(sNfaEnableDisablePollingEvent);
+            sNfaEnableDisablePollingEvent.notifyOne();
+        } break;
+
+        case NFA_RF_DISCOVERY_STARTED_EVT:  // RF Discovery started
+        {
+            LOG(DEBUG) << StringPrintf("%s: NFA_RF_DISCOVERY_STARTED_EVT: status = %u", __func__,
+                                       eventData->status);
+
+            SyncEventGuard guard(sNfaEnableDisablePollingEvent);
+            sNfaEnableDisablePollingEvent.notifyOne();
+        } break;
+
+        case NFA_RF_DISCOVERY_STOPPED_EVT:  // RF Discovery stopped event
+        {
+            LOG(DEBUG) << StringPrintf("%s: NFA_RF_DISCOVERY_STOPPED_EVT: status = %u", __func__,
+                                       eventData->status);
+
+            SyncEventGuard guard(sNfaEnableDisablePollingEvent);
+            sNfaEnableDisablePollingEvent.notifyOne();
+        } break;
+    }
+}
+
+void static nfaVSCallback(uint8_t event, uint16_t /* param_len */, uint8_t* p_param) {
+    switch (event & NCI_OID_MASK) {
+        case NCI_MSG_PROP_ANDROID: {
+            uint8_t android_sub_opcode = p_param[3];
+            switch (android_sub_opcode) {
+                case NCI_ANDROID_PASSIVE_OBSERVE: {
+                    sVSCmdStatus = p_param[4];
+                    LOG(INFO) << StringPrintf("Observe mode RSP: status: %x", sVSCmdStatus);
+                    SyncEventGuard guard(sNfaVsCommand);
+                    sNfaVsCommand.notifyOne();
+                } break;
+                case NCI_ANDROID_POLLING_FRAME_NTF: {
+                    // TODO
+                } break;
+                default:
+                    LOG(WARNING) << StringPrintf("Unknown Android sub opcode %x",
+                                                 android_sub_opcode);
+            }
+        } break;
+        default:
+            break;
+    }
+}
+
+/*
+ * Enable passive observe mode.
+ */
+tNFA_STATUS static nfaObserveModeEnable(bool enable) {
+    tNFA_STATUS status = NFA_STATUS_FAILED;
+
+    status = NFA_StopRfDiscovery();
+    if (status == NFA_STATUS_OK) {
+        if (!sNfaEnableDisablePollingEvent.wait(1000)) {
+            LOG(WARNING) << "Timeout waiting to disable NFC RF discovery";
+            return NFA_STATUS_TIMEOUT;
+        }
+    }
+
+    uint8_t cmd[] = {(NCI_MT_CMD << NCI_MT_SHIFT) | NCI_GID_PROP, NCI_MSG_PROP_ANDROID,
+                     NCI_ANDROID_PASSIVE_OBSERVE_PARAM_SIZE, NCI_ANDROID_PASSIVE_OBSERVE,
+                     static_cast<uint8_t>(enable ? NCI_ANDROID_PASSIVE_OBSERVE_PARAM_ENABLE
+                                                 : NCI_ANDROID_PASSIVE_OBSERVE_PARAM_DISABLE)};
+
+    status = NFA_SendRawVsCommand(sizeof(cmd), cmd, nfaVSCallback);
+
+    if (status == NFA_STATUS_OK) {
+        if (!sNfaVsCommand.wait(1000)) {
+            LOG(WARNING) << "Timeout waiting for NFA VS command response";
+            return NFA_STATUS_TIMEOUT;
+        }
+    }
+
+    return status;
+}
+
+class NfcBehaviorChanges : public testing::Test {
+  protected:
+    void SetUp() override {
+        tNFA_STATUS status = NFA_STATUS_OK;
+
+        sIsNfaEnabled = false;
+        sVSCmdStatus = NFA_STATUS_OK;
+
+        NfcAdaptation& theInstance = NfcAdaptation::GetInstance();
+        theInstance.Initialize();  // start GKI, NCI task, NFC task
+
+        {
+            SyncEventGuard guard(sNfaEnableEvent);
+            tHAL_NFC_ENTRY* halFuncEntries = theInstance.GetHalEntryFuncs();
+
+            NFA_Init(halFuncEntries);
+
+            status = NFA_Enable(nfaDeviceManagementCallback, nfaConnectionCallback);
+            ASSERT_EQ(status, NFA_STATUS_OK);
+
+            // wait for NFA command to finish
+            ASSERT_TRUE(sNfaEnableEvent.wait(1000))
+                    << "Timeout waiting for NFA command on NFA_Enable";
+        }
+
+        ASSERT_TRUE(sIsNfaEnabled) << "Could not initialize NFC controller";
+
+        status = NFA_StartRfDiscovery();
+        ASSERT_EQ(status, NFA_STATUS_OK);
+        ASSERT_TRUE(sNfaEnableDisablePollingEvent.wait(1000)) << "Timeout starting RF discovery";
+    }
+};
+
+/*
+ * ObserveModeEnable:
+ * Attempts to enable observe mode. Does not test Observe Mode functionality,
+ * but simply verifies that the enable command responds successfully.
+ *
+ * @VsrTest = GMS-VSR-3.2.8-001
+ */
+TEST_F(NfcBehaviorChanges, ObserveModeEnableDisable) {
+    tNFA_STATUS status = nfaObserveModeEnable(true);
+    ASSERT_EQ(status, NFA_STATUS_OK);
+
+    status = nfaObserveModeEnable(false);
+    ASSERT_EQ(status, NFA_STATUS_OK);
+}
+
+int main(int argc, char** argv) {
+    testing::InitGoogleTest(&argc, argv);
+    ABinderProcess_startThreadPool();
+    std::system("/system/bin/svc nfc disable"); /* Turn off NFC service */
+    sleep(5);
+    int status = RUN_ALL_TESTS();
+    LOG(INFO) << "Test result = " << status;
+    std::system("/system/bin/svc nfc enable"); /* Turn on NFC service */
+    sleep(5);
+    return status;
+}