diff --git a/audio/README.md b/audio/README.md
index 1938ad4..3f40d72 100644
--- a/audio/README.md
+++ b/audio/README.md
@@ -2,10 +2,29 @@
 
 Directory structure of the audio HAL related code.
 
-Run `common/all-versions/copyHAL.sh` to create a new version of the audio HAL
-based on an existing one.
+## Directory Structure for AIDL audio HAL
 
-## Directory Structure
+The AIDL version is located inside `aidl` directory. The tree below explains
+the role of each subdirectory:
+
+* `aidl_api` — snapshots of the API created each Android release. Every
+  release, the current version of the API becomes "frozen" and gets assigned
+  the next version number. If the API needs further modifications, they are
+  made on the "current" version. After making modifications, run
+  `m <package name>-update-api` to update the snapshot of the "current"
+  version.
+* `android/hardware/audio/common` — data structures and interfaces shared
+  between various HALs: BT HAL, core and effects audio HALs.
+* `android/hardware/audio/core` — data structures and interfaces of the
+  core audio HAL.
+* `default` — the default, reference implementation of the audio HAL service.
+* `vts` — VTS tests for the AIDL HAL.
+
+## Directory Structure for HIDL audio HAL
+
+Run `common/all-versions/copyHAL.sh` to create a new version of the HIDL audio
+HAL based on an existing one. Note that this isn't possible since Android T
+release. Android U and above uses AIDL audio HAL.
 
 * `2.0` — version 2.0 of the core HIDL API. Note that `.hal` files
   can not be moved into the `core` directory because that would change
diff --git a/audio/aidl/aidl_api/android.hardware.audio.effect/current/android/hardware/audio/effect/NoiseSuppression.aidl b/audio/aidl/aidl_api/android.hardware.audio.effect/current/android/hardware/audio/effect/NoiseSuppression.aidl
index 397f897..1cf92ef 100644
--- a/audio/aidl/aidl_api/android.hardware.audio.effect/current/android/hardware/audio/effect/NoiseSuppression.aidl
+++ b/audio/aidl/aidl_api/android.hardware.audio.effect/current/android/hardware/audio/effect/NoiseSuppression.aidl
@@ -50,5 +50,6 @@
     LOW,
     MEDIUM,
     HIGH,
+    VERY_HIGH,
   }
 }
diff --git a/audio/aidl/android/hardware/audio/effect/NoiseSuppression.aidl b/audio/aidl/android/hardware/audio/effect/NoiseSuppression.aidl
index 946fa87..9969a0b 100644
--- a/audio/aidl/android/hardware/audio/effect/NoiseSuppression.aidl
+++ b/audio/aidl/android/hardware/audio/effect/NoiseSuppression.aidl
@@ -62,7 +62,7 @@
      * suppression, NsConfig::SuppressionLevel::k12dB for MEDIUM, and
      * NsConfig::SuppressionLevel::k18dB for HIGH.
      */
-    @VintfStability @Backing(type="int") enum Level { LOW, MEDIUM, HIGH }
+    @VintfStability @Backing(type="int") enum Level { LOW, MEDIUM, HIGH, VERY_HIGH }
 
     /**
      * The NS level.
diff --git a/bluetooth/aidl/vts/VtsHalBluetoothTargetTest.cpp b/bluetooth/aidl/vts/VtsHalBluetoothTargetTest.cpp
index 27e6ebf..57a3361 100644
--- a/bluetooth/aidl/vts/VtsHalBluetoothTargetTest.cpp
+++ b/bluetooth/aidl/vts/VtsHalBluetoothTargetTest.cpp
@@ -46,8 +46,13 @@
 // Bluetooth Core Specification 3.0 + HS
 static constexpr uint8_t kHciMinimumLmpVersion = 5;
 
+static constexpr size_t kNumHciCommandsBandwidth = 100;
+static constexpr size_t kNumScoPacketsBandwidth = 100;
+static constexpr size_t kNumAclPacketsBandwidth = 100;
 static constexpr std::chrono::milliseconds kWaitForInitTimeout(2000);
 static constexpr std::chrono::milliseconds kWaitForHciEventTimeout(2000);
+static constexpr std::chrono::milliseconds kWaitForScoDataTimeout(1000);
+static constexpr std::chrono::milliseconds kWaitForAclDataTimeout(1000);
 static constexpr std::chrono::milliseconds kInterfaceCloseDelayMs(200);
 
 static constexpr uint8_t kCommandHciShouldBeUnknown[] = {
@@ -55,15 +60,24 @@
 static constexpr uint8_t kCommandHciReadLocalVersionInformation[] = {0x01, 0x10,
                                                                      0x00};
 static constexpr uint8_t kCommandHciReadBufferSize[] = {0x05, 0x10, 0x00};
+static constexpr uint8_t kCommandHciWriteLoopbackModeLocal[] = {0x02, 0x18,
+                                                                0x01, 0x01};
 static constexpr uint8_t kCommandHciReset[] = {0x03, 0x0c, 0x00};
+static constexpr uint8_t kCommandHciSynchronousFlowControlEnable[] = {
+    0x2f, 0x0c, 0x01, 0x01};
+static constexpr uint8_t kCommandHciWriteLocalName[] = {0x13, 0x0c, 0xf8};
 static constexpr uint8_t kHciStatusSuccess = 0x00;
 static constexpr uint8_t kHciStatusUnknownHciCommand = 0x01;
 
+static constexpr uint8_t kEventConnectionComplete = 0x03;
 static constexpr uint8_t kEventCommandComplete = 0x0e;
 static constexpr uint8_t kEventCommandStatus = 0x0f;
 static constexpr uint8_t kEventNumberOfCompletedPackets = 0x13;
+static constexpr uint8_t kEventLoopbackCommand = 0x19;
 
 static constexpr size_t kEventCodeByte = 0;
+static constexpr size_t kEventLengthByte = 1;
+static constexpr size_t kEventFirstPayloadByte = 2;
 static constexpr size_t kEventCommandStatusStatusByte = 2;
 static constexpr size_t kEventCommandStatusOpcodeLsByte = 4;    // Bytes 4 and 5
 static constexpr size_t kEventCommandCompleteOpcodeLsByte = 3;  // Bytes 3 and 4
@@ -74,15 +88,33 @@
 static constexpr size_t kEventLocalLmpVersionByte =
     kEventLocalHciVersionByte + 3;
 
+static constexpr size_t kEventConnectionCompleteParamLength = 11;
+static constexpr size_t kEventConnectionCompleteType = 11;
+static constexpr size_t kEventConnectionCompleteTypeSco = 0;
+static constexpr size_t kEventConnectionCompleteTypeAcl = 1;
+static constexpr size_t kEventConnectionCompleteHandleLsByte = 3;
+
 static constexpr size_t kEventNumberOfCompletedPacketsNumHandles = 2;
 
+static constexpr size_t kAclBroadcastFlagOffset = 6;
+static constexpr uint8_t kAclBroadcastFlagPointToPoint = 0x0;
+static constexpr uint8_t kAclBroadcastPointToPoint =
+    (kAclBroadcastFlagPointToPoint << kAclBroadcastFlagOffset);
+
+static constexpr uint8_t kAclPacketBoundaryFlagOffset = 4;
+static constexpr uint8_t kAclPacketBoundaryFlagFirstAutoFlushable = 0x2;
+static constexpr uint8_t kAclPacketBoundaryFirstAutoFlushable =
+    kAclPacketBoundaryFlagFirstAutoFlushable << kAclPacketBoundaryFlagOffset;
+
 // To discard Qualcomm ACL debugging
 static constexpr uint16_t kAclHandleQcaDebugMessage = 0xedc;
 
 class ThroughputLogger {
  public:
   ThroughputLogger(std::string task)
-      : task_(task), start_time_(std::chrono::steady_clock::now()) {}
+      : total_bytes_(0),
+        task_(task),
+        start_time_(std::chrono::steady_clock::now()) {}
 
   ~ThroughputLogger() {
     if (total_bytes_ == 0) {
@@ -153,6 +185,7 @@
     ASSERT_TRUE(hci->close().isOk());
     std::this_thread::sleep_for(kInterfaceCloseDelayMs);
     handle_no_ops();
+    discard_qca_debugging();
     EXPECT_EQ(static_cast<size_t>(0), event_queue.size());
     EXPECT_EQ(static_cast<size_t>(0), sco_queue.size());
     EXPECT_EQ(static_cast<size_t>(0), acl_queue.size());
@@ -160,9 +193,18 @@
   }
 
   void setBufferSizes();
+  void setSynchronousFlowControlEnable();
+
+  // Functions called from within tests in loopback mode
+  void sendAndCheckHci(int num_packets);
+  void sendAndCheckSco(int num_packets, size_t size, uint16_t handle);
+  void sendAndCheckAcl(int num_packets, size_t size, uint16_t handle);
 
   // Helper functions to try to get a handle on verbosity
+  void reset();
+  void enterLoopbackMode();
   void handle_no_ops();
+  void discard_qca_debugging();
   void wait_for_event(bool timeout_is_error);
   void wait_for_command_complete_event(std::vector<uint8_t> cmd);
   int wait_for_completed_packets_event(uint16_t handle);
@@ -304,6 +346,9 @@
   int max_sco_data_packet_length;
   int max_acl_data_packets;
   int max_sco_data_packets;
+
+  std::vector<uint16_t> sco_connection_handles;
+  std::vector<uint16_t> acl_connection_handles;
 };
 
 // Discard NO-OPs from the event queue.
@@ -326,7 +371,10 @@
       break;
     }
   }
-  // Discard Qualcomm ACL debugging
+}
+
+// Discard Qualcomm ACL debugging
+void BluetoothAidlTest::discard_qca_debugging() {
   while (!acl_queue.empty()) {
     std::vector<uint8_t> acl_packet;
     acl_queue.front(acl_packet);
@@ -344,24 +392,28 @@
 
 // Receive an event, discarding NO-OPs.
 void BluetoothAidlTest::wait_for_event(bool timeout_is_error = true) {
-  if (timeout_is_error) {
-    ASSERT_TRUE(event_queue.waitWithTimeout(kWaitForHciEventTimeout));
-  } else {
-    event_queue.wait();
+  // Wait until we get something that's not a no-op.
+  while (true) {
+    bool event_ready = event_queue.waitWithTimeout(kWaitForHciEventTimeout);
+    ASSERT_TRUE(event_ready || !timeout_is_error);
+    if (event_queue.empty()) {
+      // waitWithTimeout timed out
+      return;
+    }
+    handle_no_ops();
+    if (!event_queue.empty()) {
+      // There's an event in the queue that's not a no-op.
+      return;
+    }
   }
-  ASSERT_LT(static_cast<size_t>(0), event_queue.size());
-  if (event_queue.empty()) {
-    // waitWithTimeout timed out
-    return;
-  }
-  handle_no_ops();
 }
 
 // Wait until a command complete is received.
 void BluetoothAidlTest::wait_for_command_complete_event(
     std::vector<uint8_t> cmd) {
-  wait_for_event();
+  ASSERT_NO_FATAL_FAILURE(wait_for_event());
   std::vector<uint8_t> event;
+  ASSERT_FALSE(event_queue.empty());
   ASSERT_TRUE(event_queue.pop(event));
 
   ASSERT_GT(event.size(), static_cast<size_t>(kEventCommandCompleteStatusByte));
@@ -378,7 +430,7 @@
       kCommandHciReadBufferSize + sizeof(kCommandHciReadBufferSize)};
   hci->sendHciCommand(cmd);
 
-  wait_for_event();
+  ASSERT_NO_FATAL_FAILURE(wait_for_event());
   if (event_queue.empty()) {
     return;
   }
@@ -406,6 +458,155 @@
         static_cast<int>(max_sco_data_packets));
 }
 
+// Enable flow control packets for SCO
+void BluetoothAidlTest::setSynchronousFlowControlEnable() {
+  std::vector<uint8_t> cmd{kCommandHciSynchronousFlowControlEnable,
+                           kCommandHciSynchronousFlowControlEnable +
+                               sizeof(kCommandHciSynchronousFlowControlEnable)};
+  hci->sendHciCommand(cmd);
+
+  wait_for_command_complete_event(cmd);
+}
+
+// Send an HCI command (in Loopback mode) and check the response.
+void BluetoothAidlTest::sendAndCheckHci(int num_packets) {
+  ThroughputLogger logger = {__func__};
+  int command_size = 0;
+  for (int n = 0; n < num_packets; n++) {
+    // Send an HCI packet
+    std::vector<uint8_t> write_name{
+        kCommandHciWriteLocalName,
+        kCommandHciWriteLocalName + sizeof(kCommandHciWriteLocalName)};
+    // With a name
+    char new_name[] = "John Jacob Jingleheimer Schmidt ___________________0";
+    size_t new_name_length = strlen(new_name);
+    for (size_t i = 0; i < new_name_length; i++) {
+      write_name.push_back(static_cast<uint8_t>(new_name[i]));
+    }
+    // And the packet number
+    size_t i = new_name_length - 1;
+    for (int digits = n; digits > 0; digits = digits / 10, i--) {
+      write_name[i] = static_cast<uint8_t>('0' + digits % 10);
+    }
+    // And padding
+    for (size_t i = 0; i < 248 - new_name_length; i++) {
+      write_name.push_back(static_cast<uint8_t>(0));
+    }
+
+    hci->sendHciCommand(write_name);
+
+    // Check the loopback of the HCI packet
+    ASSERT_NO_FATAL_FAILURE(wait_for_event());
+
+    std::vector<uint8_t> event;
+    ASSERT_TRUE(event_queue.pop(event));
+
+    size_t compare_length = (write_name.size() > static_cast<size_t>(0xff)
+                                 ? static_cast<size_t>(0xff)
+                                 : write_name.size());
+    ASSERT_GT(event.size(), compare_length + kEventFirstPayloadByte - 1);
+
+    ASSERT_EQ(kEventLoopbackCommand, event[kEventCodeByte]);
+    ASSERT_EQ(compare_length, event[kEventLengthByte]);
+
+    // Don't compare past the end of the event.
+    if (compare_length + kEventFirstPayloadByte > event.size()) {
+      compare_length = event.size() - kEventFirstPayloadByte;
+      ALOGE("Only comparing %d bytes", static_cast<int>(compare_length));
+    }
+
+    if (n == num_packets - 1) {
+      command_size = write_name.size();
+    }
+
+    for (size_t i = 0; i < compare_length; i++) {
+      ASSERT_EQ(write_name[i], event[kEventFirstPayloadByte + i]);
+    }
+  }
+  logger.setTotalBytes(command_size * num_packets * 2);
+}
+
+// Send a SCO data packet (in Loopback mode) and check the response.
+void BluetoothAidlTest::sendAndCheckSco(int num_packets, size_t size,
+                                        uint16_t handle) {
+  ThroughputLogger logger = {__func__};
+  for (int n = 0; n < num_packets; n++) {
+    // Send a SCO packet
+    std::vector<uint8_t> sco_packet;
+    sco_packet.push_back(static_cast<uint8_t>(handle & 0xff));
+    sco_packet.push_back(static_cast<uint8_t>((handle & 0x0f00) >> 8));
+    sco_packet.push_back(static_cast<uint8_t>(size & 0xff));
+    for (size_t i = 0; i < size; i++) {
+      sco_packet.push_back(static_cast<uint8_t>(i + n));
+    }
+    hci->sendScoData(sco_packet);
+
+    // Check the loopback of the SCO packet
+    std::vector<uint8_t> sco_loopback;
+    ASSERT_TRUE(
+        sco_queue.tryPopWithTimeout(sco_loopback, kWaitForScoDataTimeout));
+
+    ASSERT_EQ(sco_packet.size(), sco_loopback.size());
+    size_t successful_bytes = 0;
+
+    for (size_t i = 0; i < sco_packet.size(); i++) {
+      if (sco_packet[i] == sco_loopback[i]) {
+        successful_bytes = i;
+      } else {
+        ALOGE("Miscompare at %d (expected %x, got %x)", static_cast<int>(i),
+              sco_packet[i], sco_loopback[i]);
+        ALOGE("At %d (expected %x, got %x)", static_cast<int>(i + 1),
+              sco_packet[i + 1], sco_loopback[i + 1]);
+        break;
+      }
+    }
+    ASSERT_EQ(sco_packet.size(), successful_bytes + 1);
+  }
+  logger.setTotalBytes(num_packets * size * 2);
+}
+
+// Send an ACL data packet (in Loopback mode) and check the response.
+void BluetoothAidlTest::sendAndCheckAcl(int num_packets, size_t size,
+                                        uint16_t handle) {
+  ThroughputLogger logger = {__func__};
+  for (int n = 0; n < num_packets; n++) {
+    // Send an ACL packet
+    std::vector<uint8_t> acl_packet;
+    acl_packet.push_back(static_cast<uint8_t>(handle & 0xff));
+    acl_packet.push_back(static_cast<uint8_t>((handle & 0x0f00) >> 8) |
+                         kAclBroadcastPointToPoint |
+                         kAclPacketBoundaryFirstAutoFlushable);
+    acl_packet.push_back(static_cast<uint8_t>(size & 0xff));
+    acl_packet.push_back(static_cast<uint8_t>((size & 0xff00) >> 8));
+    for (size_t i = 0; i < size; i++) {
+      acl_packet.push_back(static_cast<uint8_t>(i + n));
+    }
+    hci->sendAclData(acl_packet);
+
+    std::vector<uint8_t> acl_loopback;
+    // Check the loopback of the ACL packet
+    ASSERT_TRUE(
+        acl_queue.tryPopWithTimeout(acl_loopback, kWaitForAclDataTimeout));
+
+    ASSERT_EQ(acl_packet.size(), acl_loopback.size());
+    size_t successful_bytes = 0;
+
+    for (size_t i = 0; i < acl_packet.size(); i++) {
+      if (acl_packet[i] == acl_loopback[i]) {
+        successful_bytes = i;
+      } else {
+        ALOGE("Miscompare at %d (expected %x, got %x)", static_cast<int>(i),
+              acl_packet[i], acl_loopback[i]);
+        ALOGE("At %d (expected %x, got %x)", static_cast<int>(i + 1),
+              acl_packet[i + 1], acl_loopback[i + 1]);
+        break;
+      }
+    }
+    ASSERT_EQ(acl_packet.size(), successful_bytes + 1);
+  }
+  logger.setTotalBytes(num_packets * size * 2);
+}
+
 // Return the number of completed packets reported by the controller.
 int BluetoothAidlTest::wait_for_completed_packets_event(uint16_t handle) {
   int packets_processed = 0;
@@ -429,11 +630,8 @@
   return packets_processed;
 }
 
-// Empty test: Initialize()/Close() are called in SetUp()/TearDown().
-TEST_P(BluetoothAidlTest, InitializeAndClose) {}
-
-// Send an HCI Reset with sendHciCommand and wait for a command complete event.
-TEST_P(BluetoothAidlTest, HciReset) {
+// Send the reset command and wait for a response.
+void BluetoothAidlTest::reset() {
   std::vector<uint8_t> reset{kCommandHciReset,
                              kCommandHciReset + sizeof(kCommandHciReset)};
   hci->sendHciCommand(reset);
@@ -441,17 +639,74 @@
   wait_for_command_complete_event(reset);
 }
 
+// Send local loopback command and initialize SCO and ACL handles.
+void BluetoothAidlTest::enterLoopbackMode() {
+  std::vector<uint8_t> cmd{kCommandHciWriteLoopbackModeLocal,
+                           kCommandHciWriteLoopbackModeLocal +
+                               sizeof(kCommandHciWriteLoopbackModeLocal)};
+  hci->sendHciCommand(cmd);
+
+  // Receive connection complete events with data channels
+  int connection_event_count = 0;
+  bool command_complete_received = false;
+  while (true) {
+    wait_for_event(false);
+    if (event_queue.empty()) {
+      // Fail if there was no event received or no connections completed.
+      ASSERT_TRUE(command_complete_received);
+      ASSERT_LT(0, connection_event_count);
+      return;
+    }
+    std::vector<uint8_t> event;
+    ASSERT_TRUE(event_queue.pop(event));
+    ASSERT_GT(event.size(),
+              static_cast<size_t>(kEventCommandCompleteStatusByte));
+    if (event[kEventCodeByte] == kEventConnectionComplete) {
+      ASSERT_GT(event.size(),
+                static_cast<size_t>(kEventConnectionCompleteType));
+      ASSERT_EQ(event[kEventLengthByte], kEventConnectionCompleteParamLength);
+      uint8_t connection_type = event[kEventConnectionCompleteType];
+
+      ASSERT_TRUE(connection_type == kEventConnectionCompleteTypeSco ||
+                  connection_type == kEventConnectionCompleteTypeAcl);
+
+      // Save handles
+      uint16_t handle = event[kEventConnectionCompleteHandleLsByte] |
+                        event[kEventConnectionCompleteHandleLsByte + 1] << 8;
+      if (connection_type == kEventConnectionCompleteTypeSco) {
+        sco_connection_handles.push_back(handle);
+      } else {
+        acl_connection_handles.push_back(handle);
+      }
+
+      ALOGD("Connect complete type = %d handle = %d",
+            event[kEventConnectionCompleteType], handle);
+      connection_event_count++;
+    } else {
+      ASSERT_EQ(kEventCommandComplete, event[kEventCodeByte]);
+      ASSERT_EQ(cmd[0], event[kEventCommandCompleteOpcodeLsByte]);
+      ASSERT_EQ(cmd[1], event[kEventCommandCompleteOpcodeLsByte + 1]);
+      ASSERT_EQ(kHciStatusSuccess, event[kEventCommandCompleteStatusByte]);
+      command_complete_received = true;
+    }
+  }
+}
+
+// Empty test: Initialize()/Close() are called in SetUp()/TearDown().
+TEST_P(BluetoothAidlTest, InitializeAndClose) {}
+
+// Send an HCI Reset with sendHciCommand and wait for a command complete event.
+TEST_P(BluetoothAidlTest, HciReset) { reset(); }
+
 // Read and check the HCI version of the controller.
 TEST_P(BluetoothAidlTest, HciVersionTest) {
+  reset();
   std::vector<uint8_t> cmd{kCommandHciReadLocalVersionInformation,
                            kCommandHciReadLocalVersionInformation +
                                sizeof(kCommandHciReadLocalVersionInformation)};
   hci->sendHciCommand(cmd);
 
-  wait_for_event();
-  if (event_queue.empty()) {
-    return;
-  }
+  ASSERT_NO_FATAL_FAILURE(wait_for_event());
 
   std::vector<uint8_t> event;
   ASSERT_TRUE(event_queue.pop(event));
@@ -468,15 +723,13 @@
 
 // Send an unknown HCI command and wait for the error message.
 TEST_P(BluetoothAidlTest, HciUnknownCommand) {
+  reset();
   std::vector<uint8_t> cmd{
       kCommandHciShouldBeUnknown,
       kCommandHciShouldBeUnknown + sizeof(kCommandHciShouldBeUnknown)};
   hci->sendHciCommand(cmd);
 
-  wait_for_event();
-  if (event_queue.empty()) {
-    return;
-  }
+  ASSERT_NO_FATAL_FAILURE(wait_for_event());
 
   std::vector<uint8_t> event;
   ASSERT_TRUE(event_queue.pop(event));
@@ -496,8 +749,121 @@
   }
 }
 
+// Enter loopback mode, but don't send any packets.
+TEST_P(BluetoothAidlTest, WriteLoopbackMode) {
+  reset();
+  enterLoopbackMode();
+}
+
+// Enter loopback mode and send a single command.
+TEST_P(BluetoothAidlTest, LoopbackModeSingleCommand) {
+  reset();
+  setBufferSizes();
+
+  enterLoopbackMode();
+
+  sendAndCheckHci(1);
+}
+
+// Enter loopback mode and send a single SCO packet.
+TEST_P(BluetoothAidlTest, LoopbackModeSingleSco) {
+  reset();
+  setBufferSizes();
+  setSynchronousFlowControlEnable();
+
+  enterLoopbackMode();
+
+  if (!sco_connection_handles.empty()) {
+    ASSERT_LT(0, max_sco_data_packet_length);
+    sendAndCheckSco(1, max_sco_data_packet_length, sco_connection_handles[0]);
+    int sco_packets_sent = 1;
+    int completed_packets =
+        wait_for_completed_packets_event(sco_connection_handles[0]);
+    if (sco_packets_sent != completed_packets) {
+      ALOGW("%s: packets_sent (%d) != completed_packets (%d)", __func__,
+            sco_packets_sent, completed_packets);
+    }
+  }
+}
+
+// Enter loopback mode and send a single ACL packet.
+TEST_P(BluetoothAidlTest, LoopbackModeSingleAcl) {
+  reset();
+  setBufferSizes();
+
+  enterLoopbackMode();
+
+  if (!acl_connection_handles.empty()) {
+    ASSERT_LT(0, max_acl_data_packet_length);
+    sendAndCheckAcl(1, max_acl_data_packet_length - 1,
+                    acl_connection_handles[0]);
+    int acl_packets_sent = 1;
+    int completed_packets =
+        wait_for_completed_packets_event(acl_connection_handles[0]);
+    if (acl_packets_sent != completed_packets) {
+      ALOGW("%s: packets_sent (%d) != completed_packets (%d)", __func__,
+            acl_packets_sent, completed_packets);
+    }
+  }
+  ASSERT_GE(acl_cb_count, 1);
+}
+
+// Enter loopback mode and send command packets for bandwidth measurements.
+TEST_P(BluetoothAidlTest, LoopbackModeCommandBandwidth) {
+  reset();
+  setBufferSizes();
+
+  enterLoopbackMode();
+
+  sendAndCheckHci(kNumHciCommandsBandwidth);
+}
+
+// Enter loopback mode and send SCO packets for bandwidth measurements.
+TEST_P(BluetoothAidlTest, LoopbackModeScoBandwidth) {
+  reset();
+  setBufferSizes();
+  setSynchronousFlowControlEnable();
+
+  enterLoopbackMode();
+
+  if (!sco_connection_handles.empty()) {
+    ASSERT_LT(0, max_sco_data_packet_length);
+    sendAndCheckSco(kNumScoPacketsBandwidth, max_sco_data_packet_length,
+                    sco_connection_handles[0]);
+    int sco_packets_sent = kNumScoPacketsBandwidth;
+    int completed_packets =
+        wait_for_completed_packets_event(sco_connection_handles[0]);
+    if (sco_packets_sent != completed_packets) {
+      ALOGW("%s: packets_sent (%d) != completed_packets (%d)", __func__,
+            sco_packets_sent, completed_packets);
+    }
+  }
+}
+
+// Enter loopback mode and send packets for ACL bandwidth measurements.
+TEST_P(BluetoothAidlTest, LoopbackModeAclBandwidth) {
+  reset();
+  setBufferSizes();
+
+  enterLoopbackMode();
+
+  if (!acl_connection_handles.empty()) {
+    ASSERT_LT(0, max_acl_data_packet_length);
+    sendAndCheckAcl(kNumAclPacketsBandwidth, max_acl_data_packet_length - 1,
+                    acl_connection_handles[0]);
+    int acl_packets_sent = kNumAclPacketsBandwidth;
+    int completed_packets =
+        wait_for_completed_packets_event(acl_connection_handles[0]);
+    if (acl_packets_sent != completed_packets) {
+      ALOGW("%s: packets_sent (%d) != completed_packets (%d)", __func__,
+            acl_packets_sent, completed_packets);
+    }
+  }
+}
+
 // Set all bits in the event mask
 TEST_P(BluetoothAidlTest, SetEventMask) {
+  reset();
   std::vector<uint8_t> set_event_mask{
       0x01, 0x0c, 0x08 /*parameter bytes*/, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
       0xff, 0xff};
@@ -507,6 +873,7 @@
 
 // Set all bits in the LE event mask
 TEST_P(BluetoothAidlTest, SetLeEventMask) {
+  reset();
   std::vector<uint8_t> set_event_mask{
       0x20, 0x0c, 0x08 /*parameter bytes*/, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
       0xff, 0xff};