add intent parameters

Fix Rust lints

.github/workflows/code-check.yml

@@ -14,6 +14,10 @@ jobs:
   check:
     name: Check Code
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
+      fail-fast: false
 
     steps:
     - name: Check out from Git

.github/workflows/python-build-test.yml

@@ -12,10 +12,10 @@ permissions:
 
 jobs:
   build:
-
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
+        os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
         python-version: ["3.8", "3.9", "3.10", "3.11"]
       fail-fast: false
 
@@ -41,11 +41,13 @@ jobs:
       run: |
         inv build
         inv build.mkdocs
+
   build-rust:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ "3.8", "3.9", "3.10" ]
+        python-version: [ "3.8", "3.9", "3.10", "3.11" ]
+        rust-version: [ "1.70.0", "stable" ]
       fail-fast: false
     steps:
       - name: Check out from Git
@@ -62,9 +64,17 @@ jobs:
         uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           components: clippy,rustfmt
-      - name: Rust Lints
-        run: cd rust && cargo fmt --check && cargo clippy --all-targets -- --deny warnings
+          toolchain: ${{ matrix.rust-version }}
+      - name: Check License Headers
+        run: cd rust && cargo run --features dev-tools --bin file-header check-all
       - name: Rust Build
-        run: cd rust && cargo build --all-targets
+        run: cd rust && cargo build --all-targets && cargo build --all-features --all-targets
+      # Lints after build so what clippy needs is already built
+      - name: Rust Lints
+        run: cd rust && cargo fmt --check && cargo clippy --all-targets -- --deny warnings && cargo clippy --all-features --all-targets -- --deny warnings
       - name: Rust Tests
-        run: cd rust && cargo test
+        run: cd rust && cargo test
+      # At some point, hook up publishing the binary. For now, just make sure it builds.
+      # Once we're ready to publish binaries, this should be built with `--release`.
+      - name: Build Bumble CLI
+        run: cd rust && cargo build --features bumble-tools --bin bumble

.vscode/settings.json

@@ -39,10 +39,12 @@
         "libusb",
         "MITM",
         "NDIS",
+        "netsim",
         "NONBLOCK",
         "NONCONN",
         "OXIMETER",
         "popleft",
+        "protobuf",
         "psms",
         "pyee",
         "pyusb",

apps/console.py

@@ -1172,7 +1172,7 @@ class ScanResult:
             name = ''
 
         # Remove any '/P' qualifier suffix from the address string
-        address_str = str(self.address).replace('/P', '')
+        address_str = self.address.to_string(with_type_qualifier=False)
 
         # RSSI bar
         bar_string = rssi_bar(self.rssi)

apps/controller_info.py

@@ -63,7 +63,8 @@ async def get_classic_info(host):
         if command_succeeded(response):
             print()
             print(
-                color('Classic Address:', 'yellow'), response.return_parameters.bd_addr
+                color('Classic Address:', 'yellow'),
+                response.return_parameters.bd_addr.to_string(False),
             )
 
     if host.supports_command(HCI_READ_LOCAL_NAME_COMMAND):

apps/l2cap_bridge.py

@@ -105,7 +105,7 @@ class ServerBridge:
                             asyncio.create_task(self.pipe.l2cap_channel.disconnect())
 
                     def data_received(self, data):
-                        print(f'<<< Received on TCP: {len(data)}')
+                        print(color(f'<<< [TCP DATA]: {len(data)} bytes', 'blue'))
                         self.pipe.l2cap_channel.write(data)
 
                 try:
@@ -123,6 +123,7 @@ class ServerBridge:
                     await self.l2cap_channel.disconnect()
 
             def on_l2cap_close(self):
+                print(color('*** L2CAP channel closed', 'red'))
                 self.l2cap_channel = None
                 if self.tcp_transport is not None:
                     self.tcp_transport.close()

apps/pandora_server.py

@@ -3,7 +3,7 @@ import click
 import logging
 import json
 
-from bumble.pandora import PandoraDevice, serve
+from bumble.pandora import PandoraDevice, Config, serve
 from typing import Dict, Any
 
 BUMBLE_SERVER_GRPC_PORT = 7999
@@ -29,12 +29,14 @@ def main(grpc_port: int, rootcanal_port: int, transport: str, config: str) -> No
         transport = transport.replace('<rootcanal-port>', str(rootcanal_port))
 
     bumble_config = retrieve_config(config)
-    if 'transport' not in bumble_config.keys():
-        bumble_config.update({'transport': transport})
+    bumble_config.setdefault('transport', transport)
     device = PandoraDevice(bumble_config)
 
+    server_config = Config()
+    server_config.load_from_dict(bumble_config.get('server', {}))
+
     logging.basicConfig(level=logging.DEBUG)
-    asyncio.run(serve(device, port=grpc_port))
+    asyncio.run(serve(device, config=server_config, port=grpc_port))
 
 
 def retrieve_config(config: str) -> Dict[str, Any]:

apps/show.py

@@ -102,9 +102,21 @@ class SnoopPacketReader:
     default='h4',
     help='Format of the input file',
 )
+@click.option(
+    '--vendors',
+    type=click.Choice(['android', 'zephyr']),
+    multiple=True,
+    help='Support vendor-specific commands (list one or more)',
+)
 @click.argument('filename')
 # pylint: disable=redefined-builtin
-def main(format, filename):
+def main(format, vendors, filename):
+    for vendor in vendors:
+        if vendor == 'android':
+            import bumble.vendor.android.hci
+        elif vendor == 'zephyr':
+            import bumble.vendor.zephyr.hci
+
     input = open(filename, 'rb')
     if format == 'h4':
         packet_reader = PacketReader(input)
@@ -124,7 +136,6 @@ def main(format, filename):
             if packet is None:
                 break
             tracer.trace(hci.HCI_Packet.from_bytes(packet), direction)
-
         except Exception as error:
             print(color(f'!!! {error}', 'red'))
 

apps/speaker/speaker.css

@@ -56,7 +56,7 @@ body, h1, h2, h3, h4, h5, h6 {
     border-radius: 4px;
     padding: 4px;
     margin: 6px;
-    margin-left: 0px;
+    margin-left: 0;
 }
 
 th, td {
@@ -65,7 +65,7 @@ th, td {
 }
 
 .properties td:nth-child(even) {
-    background-color: #D6EEEE;
+    background-color: #d6eeee;
     font-family: monospace;
 }
 

apps/speaker/speaker.html

@@ -2,7 +2,7 @@
 <html>
 <head>
   <title>Bumble Speaker</title>
-  <script type="text/javascript" src="speaker.js"></script>
+  <script src="speaker.js"></script>
   <link rel="stylesheet" href="speaker.css">
 </head>
 <body>

apps/speaker/speaker.py

@@ -195,7 +195,7 @@ class WebSocketOutput(QueuedOutput):
         except HCI_StatusError:
             pass
         peer_name = '' if connection.peer_name is None else connection.peer_name
-        peer_address = str(connection.peer_address).replace('/P', '')
+        peer_address = connection.peer_address.to_string(False)
         await self.send_message(
             'connection',
             peer_address=peer_address,
@@ -376,7 +376,7 @@ class UiServer:
         if connection := self.speaker().connection:
             await self.send_message(
                 'connection',
-                peer_address=str(connection.peer_address).replace('/P', ''),
+                peer_address=connection.peer_address.to_string(False),
                 peer_name=connection.peer_name,
             )
 

bumble/att.py

@@ -23,13 +23,14 @@
 # Imports
 # -----------------------------------------------------------------------------
 from __future__ import annotations
+import enum
 import functools
 import struct
 from pyee import EventEmitter
-from typing import Dict, Type, TYPE_CHECKING
+from typing import Dict, Type, List, Protocol, Union, Optional, Any, TYPE_CHECKING
 
-from bumble.core import UUID, name_or_number, get_dict_key_by_value, ProtocolError
-from bumble.hci import HCI_Object, key_with_value, HCI_Constant
+from bumble.core import UUID, name_or_number, ProtocolError
+from bumble.hci import HCI_Object, key_with_value
 from bumble.colors import color
 
 if TYPE_CHECKING:
@@ -182,6 +183,7 @@ UUID_2_FIELD_SPEC    = lambda x, y: UUID.parse_uuid_2(x, y)  # noqa: E731
 # pylint: enable=line-too-long
 # pylint: disable=invalid-name
 
+
 # -----------------------------------------------------------------------------
 # Exceptions
 # -----------------------------------------------------------------------------
@@ -209,7 +211,7 @@ class ATT_PDU:
 
     pdu_classes: Dict[int, Type[ATT_PDU]] = {}
     op_code = 0
-    name = None
+    name: str
 
     @staticmethod
     def from_bytes(pdu):
@@ -719,48 +721,68 @@ class ATT_Handle_Value_Confirmation(ATT_PDU):
     '''
 
 
+# -----------------------------------------------------------------------------
+class ConnectionValue(Protocol):
+    def read(self, connection) -> bytes:
+        ...
+
+    def write(self, connection, value: bytes) -> None:
+        ...
+
+
 # -----------------------------------------------------------------------------
 class Attribute(EventEmitter):
-    # Permission flags
-    READABLE = 0x01
-    WRITEABLE = 0x02
-    READ_REQUIRES_ENCRYPTION = 0x04
-    WRITE_REQUIRES_ENCRYPTION = 0x08
-    READ_REQUIRES_AUTHENTICATION = 0x10
-    WRITE_REQUIRES_AUTHENTICATION = 0x20
-    READ_REQUIRES_AUTHORIZATION = 0x40
-    WRITE_REQUIRES_AUTHORIZATION = 0x80
+    class Permissions(enum.IntFlag):
+        READABLE = 0x01
+        WRITEABLE = 0x02
+        READ_REQUIRES_ENCRYPTION = 0x04
+        WRITE_REQUIRES_ENCRYPTION = 0x08
+        READ_REQUIRES_AUTHENTICATION = 0x10
+        WRITE_REQUIRES_AUTHENTICATION = 0x20
+        READ_REQUIRES_AUTHORIZATION = 0x40
+        WRITE_REQUIRES_AUTHORIZATION = 0x80
 
-    PERMISSION_NAMES = {
-        READABLE: 'READABLE',
-        WRITEABLE: 'WRITEABLE',
-        READ_REQUIRES_ENCRYPTION: 'READ_REQUIRES_ENCRYPTION',
-        WRITE_REQUIRES_ENCRYPTION: 'WRITE_REQUIRES_ENCRYPTION',
-        READ_REQUIRES_AUTHENTICATION: 'READ_REQUIRES_AUTHENTICATION',
-        WRITE_REQUIRES_AUTHENTICATION: 'WRITE_REQUIRES_AUTHENTICATION',
-        READ_REQUIRES_AUTHORIZATION: 'READ_REQUIRES_AUTHORIZATION',
-        WRITE_REQUIRES_AUTHORIZATION: 'WRITE_REQUIRES_AUTHORIZATION',
-    }
+        @classmethod
+        def from_string(cls, permissions_str: str) -> Attribute.Permissions:
+            try:
+                return functools.reduce(
+                    lambda x, y: x | Attribute.Permissions[y],
+                    permissions_str.replace('|', ',').split(","),
+                    Attribute.Permissions(0),
+                )
+            except TypeError as exc:
+                # The check for `p.name is not None` here is needed because for InFlag
+                # enums, the .name property can be None, when the enum value is 0,
+                # so the type hint for .name is Optional[str].
+                enum_list: List[str] = [p.name for p in cls if p.name is not None]
+                enum_list_str = ",".join(enum_list)
+                raise TypeError(
+                    f"Attribute::permissions error:\nExpected a string containing any of the keys, separated by commas: {enum_list_str  }\nGot: {permissions_str}"
+                ) from exc
 
-    @staticmethod
-    def string_to_permissions(permissions_str: str):
-        try:
-            return functools.reduce(
-                lambda x, y: x | get_dict_key_by_value(Attribute.PERMISSION_NAMES, y),
-                permissions_str.split(","),
-                0,
-            )
-        except TypeError as exc:
-            raise TypeError(
-                f"Attribute::permissions error:\nExpected a string containing any of the keys, separated by commas: {','.join(Attribute.PERMISSION_NAMES.values())}\nGot: {permissions_str}"
-            ) from exc
+    # Permission flags(legacy-use only)
+    READABLE = Permissions.READABLE
+    WRITEABLE = Permissions.WRITEABLE
+    READ_REQUIRES_ENCRYPTION = Permissions.READ_REQUIRES_ENCRYPTION
+    WRITE_REQUIRES_ENCRYPTION = Permissions.WRITE_REQUIRES_ENCRYPTION
+    READ_REQUIRES_AUTHENTICATION = Permissions.READ_REQUIRES_AUTHENTICATION
+    WRITE_REQUIRES_AUTHENTICATION = Permissions.WRITE_REQUIRES_AUTHENTICATION
+    READ_REQUIRES_AUTHORIZATION = Permissions.READ_REQUIRES_AUTHORIZATION
+    WRITE_REQUIRES_AUTHORIZATION = Permissions.WRITE_REQUIRES_AUTHORIZATION
 
-    def __init__(self, attribute_type, permissions, value=b''):
+    value: Union[str, bytes, ConnectionValue]
+
+    def __init__(
+        self,
+        attribute_type: Union[str, bytes, UUID],
+        permissions: Union[str, Attribute.Permissions],
+        value: Union[str, bytes, ConnectionValue] = b'',
+    ) -> None:
         EventEmitter.__init__(self)
         self.handle = 0
         self.end_group_handle = 0
         if isinstance(permissions, str):
-            self.permissions = self.string_to_permissions(permissions)
+            self.permissions = Attribute.Permissions.from_string(permissions)
         else:
             self.permissions = permissions
 
@@ -778,22 +800,26 @@ class Attribute(EventEmitter):
         else:
             self.value = value
 
-    def encode_value(self, value):
+    def encode_value(self, value: Any) -> bytes:
         return value
 
-    def decode_value(self, value_bytes):
+    def decode_value(self, value_bytes: bytes) -> Any:
         return value_bytes
 
-    def read_value(self, connection: Connection):
+    def read_value(self, connection: Optional[Connection]) -> bytes:
         if (
-            self.permissions & self.READ_REQUIRES_ENCRYPTION
-        ) and not connection.encryption:
+            (self.permissions & self.READ_REQUIRES_ENCRYPTION)
+            and connection is not None
+            and not connection.encryption
+        ):
             raise ATT_Error(
                 error_code=ATT_INSUFFICIENT_ENCRYPTION_ERROR, att_handle=self.handle
             )
         if (
-            self.permissions & self.READ_REQUIRES_AUTHENTICATION
-        ) and not connection.authenticated:
+            (self.permissions & self.READ_REQUIRES_AUTHENTICATION)
+            and connection is not None
+            and not connection.authenticated
+        ):
             raise ATT_Error(
                 error_code=ATT_INSUFFICIENT_AUTHENTICATION_ERROR, att_handle=self.handle
             )
@@ -803,9 +829,9 @@ class Attribute(EventEmitter):
                 error_code=ATT_INSUFFICIENT_AUTHORIZATION_ERROR, att_handle=self.handle
             )
 
-        if read := getattr(self.value, 'read', None):
+        if hasattr(self.value, 'read'):
             try:
-                value = read(connection)  # pylint: disable=not-callable
+                value = self.value.read(connection)
             except ATT_Error as error:
                 raise ATT_Error(
                     error_code=error.error_code, att_handle=self.handle
@@ -815,7 +841,7 @@ class Attribute(EventEmitter):
 
         return self.encode_value(value)
 
-    def write_value(self, connection: Connection, value_bytes):
+    def write_value(self, connection: Connection, value_bytes: bytes) -> None:
         if (
             self.permissions & self.WRITE_REQUIRES_ENCRYPTION
         ) and not connection.encryption:
@@ -836,9 +862,9 @@ class Attribute(EventEmitter):
 
         value = self.decode_value(value_bytes)
 
-        if write := getattr(self.value, 'write', None):
+        if hasattr(self.value, 'write'):
             try:
-                write(connection, value)  # pylint: disable=not-callable
+                self.value.write(connection, value)  # pylint: disable=not-callable
             except ATT_Error as error:
                 raise ATT_Error(
                     error_code=error.error_code, att_handle=self.handle

bumble/controller.py

@@ -15,6 +15,8 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+from __future__ import annotations
+
 import logging
 import asyncio
 import itertools
@@ -58,8 +60,10 @@ from bumble.hci import (
     HCI_Packet,
     HCI_Role_Change_Event,
 )
-from typing import Optional, Union, Dict
+from typing import Optional, Union, Dict, TYPE_CHECKING
 
+if TYPE_CHECKING:
+    from bumble.transport.common import TransportSink, TransportSource
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -104,7 +108,7 @@ class Controller:
         self,
         name,
         host_source=None,
-        host_sink=None,
+        host_sink: Optional[TransportSink] = None,
         link=None,
         public_address: Optional[Union[bytes, str, Address]] = None,
     ):

bumble/core.py

@@ -78,7 +78,13 @@ def get_dict_key_by_value(dictionary, value):
 class BaseError(Exception):
     """Base class for errors with an error code, error name and namespace"""
 
-    def __init__(self, error_code, error_namespace='', error_name='', details=''):
+    def __init__(
+        self,
+        error_code: Optional[int],
+        error_namespace: str = '',
+        error_name: str = '',
+        details: str = '',
+    ):
         super().__init__()
         self.error_code = error_code
         self.error_namespace = error_namespace
@@ -90,12 +96,14 @@ class BaseError(Exception):
             namespace = f'{self.error_namespace}/'
         else:
             namespace = ''
-        if self.error_name:
-            name = f'{self.error_name} [0x{self.error_code:X}]'
-        else:
-            name = f'0x{self.error_code:X}'
+        error_text = {
+            (True, True): f'{self.error_name} [0x{self.error_code:X}]',
+            (True, False): self.error_name,
+            (False, True): f'0x{self.error_code:X}',
+            (False, False): '',
+        }[(self.error_name != '', self.error_code is not None)]
 
-        return f'{type(self).__name__}({namespace}{name})'
+        return f'{type(self).__name__}({namespace}{error_text})'
 
 
 class ProtocolError(BaseError):
@@ -134,6 +142,10 @@ class ConnectionError(BaseError):  # pylint: disable=redefined-builtin
         self.peer_address = peer_address
 
 
+class ConnectionParameterUpdateError(BaseError):
+    """Connection Parameter Update Error"""
+
+
 # -----------------------------------------------------------------------------
 # UUID
 #

bumble/device.py

@@ -23,7 +23,18 @@ import asyncio
 import logging
 from contextlib import asynccontextmanager, AsyncExitStack
 from dataclasses import dataclass
-from typing import Any, Callable, ClassVar, Dict, List, Optional, Tuple, Type, Union
+from typing import (
+    Any,
+    Callable,
+    ClassVar,
+    Dict,
+    List,
+    Optional,
+    Tuple,
+    Type,
+    Union,
+    TYPE_CHECKING,
+)
 
 from .colors import color
 from .att import ATT_CID, ATT_DEFAULT_MTU, ATT_PDU
@@ -130,6 +141,7 @@ from .core import (
     BT_LE_TRANSPORT,
     BT_PERIPHERAL_ROLE,
     AdvertisingData,
+    ConnectionParameterUpdateError,
     CommandTimeoutError,
     ConnectionPHY,
     InvalidStateError,
@@ -152,6 +164,9 @@ from . import sdp
 from . import l2cap
 from . import core
 
+if TYPE_CHECKING:
+    from .transport.common import TransportSource, TransportSink
+
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -709,6 +724,7 @@ class Connection(CompositeEventEmitter):
         connection_interval_max,
         max_latency,
         supervision_timeout,
+        use_l2cap=False,
     ):
         return await self.device.update_connection_parameters(
             self,
@@ -716,6 +732,7 @@ class Connection(CompositeEventEmitter):
             connection_interval_max,
             max_latency,
             supervision_timeout,
+            use_l2cap=use_l2cap,
         )
 
     async def set_phy(self, tx_phys=None, rx_phys=None, phy_options=None):
@@ -942,7 +959,13 @@ class Device(CompositeEventEmitter):
             pass
 
     @classmethod
-    def with_hci(cls, name, address, hci_source, hci_sink):
+    def with_hci(
+        cls,
+        name: str,
+        address: Address,
+        hci_source: TransportSource,
+        hci_sink: TransportSink,
+    ) -> Device:
         '''
         Create a Device instance with a Host configured to communicate with a controller
         through an HCI source/sink
@@ -951,18 +974,25 @@ class Device(CompositeEventEmitter):
         return cls(name=name, address=address, host=host)
 
     @classmethod
-    def from_config_file(cls, filename):
+    def from_config_file(cls, filename: str) -> Device:
         config = DeviceConfiguration()
         config.load_from_file(filename)
         return cls(config=config)
 
     @classmethod
-    def from_config_with_hci(cls, config, hci_source, hci_sink):
+    def from_config_with_hci(
+        cls,
+        config: DeviceConfiguration,
+        hci_source: TransportSource,
+        hci_sink: TransportSink,
+    ) -> Device:
         host = Host(controller_source=hci_source, controller_sink=hci_sink)
         return cls(config=config, host=host)
 
     @classmethod
-    def from_config_file_with_hci(cls, filename, hci_source, hci_sink):
+    def from_config_file_with_hci(
+        cls, filename: str, hci_source: TransportSource, hci_sink: TransportSink
+    ) -> Device:
         config = DeviceConfiguration()
         config.load_from_file(filename)
         return cls.from_config_with_hci(config, hci_source, hci_sink)
@@ -1156,8 +1186,8 @@ class Device(CompositeEventEmitter):
     def create_l2cap_registrar(self, psm):
         return lambda handler: self.register_l2cap_server(psm, handler)
 
-    def register_l2cap_server(self, psm, server):
-        self.l2cap_channel_manager.register_server(psm, server)
+    def register_l2cap_server(self, psm, server) -> int:
+        return self.l2cap_channel_manager.register_server(psm, server)
 
     def register_l2cap_channel_server(
         self,
@@ -1395,10 +1425,10 @@ class Device(CompositeEventEmitter):
             check_result=True,
         )
 
-        self.advertising_own_address_type = own_address_type
-        self.auto_restart_advertising = auto_restart
         self.advertising_type = advertising_type
+        self.advertising_own_address_type = own_address_type
         self.advertising = True
+        self.auto_restart_advertising = auto_restart
 
     async def stop_advertising(self) -> None:
         # Disable advertising
@@ -1408,9 +1438,9 @@ class Device(CompositeEventEmitter):
                 check_result=True,
             )
 
+            self.advertising_type = None
             self.advertising_own_address_type = None
             self.advertising = False
-            self.advertising_type = None
             self.auto_restart_advertising = False
 
     @property
@@ -2083,11 +2113,30 @@ class Device(CompositeEventEmitter):
         supervision_timeout,
         min_ce_length=0,
         max_ce_length=0,
-    ):
+        use_l2cap=False,
+    ) -> None:
         '''
         NOTE: the name of the parameters may look odd, but it just follows the names
         used in the Bluetooth spec.
         '''
+
+        if use_l2cap:
+            if connection.role != BT_PERIPHERAL_ROLE:
+                raise InvalidStateError(
+                    'only peripheral can update connection parameters with l2cap'
+                )
+            l2cap_result = (
+                await self.l2cap_channel_manager.update_connection_parameters(
+                    connection,
+                    connection_interval_min,
+                    connection_interval_max,
+                    max_latency,
+                    supervision_timeout,
+                )
+            )
+            if l2cap_result != l2cap.L2CAP_CONNECTION_PARAMETERS_ACCEPTED_RESULT:
+                raise ConnectionParameterUpdateError(l2cap_result)
+
         result = await self.send_command(
             HCI_LE_Connection_Update_Command(
                 connection_handle=connection.handle,
@@ -2097,7 +2146,7 @@ class Device(CompositeEventEmitter):
                 supervision_timeout=supervision_timeout,
                 min_ce_length=min_ce_length,
                 max_ce_length=max_ce_length,
-            )
+            )  # type: ignore[call-arg]
         )
         if result.status != HCI_Command_Status_Event.PENDING:
             raise HCI_StatusError(result)
@@ -2238,9 +2287,11 @@ class Device(CompositeEventEmitter):
     def request_pairing(self, connection):
         return self.smp_manager.request_pairing(connection)
 
-    async def get_long_term_key(self, connection_handle, rand, ediv):
+    async def get_long_term_key(
+        self, connection_handle: int, rand: bytes, ediv: int
+    ) -> Optional[bytes]:
         if (connection := self.lookup_connection(connection_handle)) is None:
-            return
+            return None
 
         # Start by looking for the key in an SMP session
         ltk = self.smp_manager.get_long_term_key(connection, rand, ediv)
@@ -2260,6 +2311,7 @@ class Device(CompositeEventEmitter):
 
                 if connection.role == BT_PERIPHERAL_ROLE and keys.ltk_peripheral:
                     return keys.ltk_peripheral.value
+        return None
 
     async def get_link_key(self, address: Address) -> Optional[bytes]:
         if self.keystore is None:
@@ -2578,7 +2630,6 @@ class Device(CompositeEventEmitter):
                 own_address_type = self.advertising_own_address_type
 
             # We are no longer advertising
-            self.advertising_own_address_type = None
             self.advertising = False
 
             if own_address_type in (
@@ -2635,7 +2686,6 @@ class Device(CompositeEventEmitter):
             and self.advertising
             and self.advertising_type.is_directed
         ):
-            self.advertising_own_address_type = None
             self.advertising = False
 
         # Notify listeners
@@ -2706,7 +2756,9 @@ class Device(CompositeEventEmitter):
             self.abort_on(
                 'flush',
                 self.start_advertising(
-                    advertising_type=self.advertising_type, auto_restart=True
+                    advertising_type=self.advertising_type,
+                    own_address_type=self.advertising_own_address_type,
+                    auto_restart=True,
                 ),
             )
 

bumble/drivers/__init__.py

@@ -21,6 +21,8 @@ like loading firmware after a cold start.
 # -----------------------------------------------------------------------------
 import abc
 import logging
+import pathlib
+import platform
 from . import rtk
 
 
@@ -66,3 +68,24 @@ async def get_driver_for_host(host):
         return driver
 
     return None
+
+
+def project_data_dir() -> pathlib.Path:
+    """
+    Returns:
+        A path to an OS-specific directory for bumble data. The directory is created if
+         it doesn't exist.
+    """
+    import platformdirs
+
+    if platform.system() == 'Darwin':
+        # platformdirs doesn't handle macOS right: it doesn't assemble a bundle id
+        # out of author & project
+        return platformdirs.user_data_path(
+            appname='com.google.bumble', ensure_exists=True
+        )
+    else:
+        # windows and linux don't use the com qualifier
+        return platformdirs.user_data_path(
+            appname='bumble', appauthor='google', ensure_exists=True
+        )

bumble/drivers/rtk.py

@@ -34,10 +34,9 @@ import weakref
 
 
 from bumble.hci import (
-    hci_command_op_code,
+    hci_vendor_command_op_code,
     STATUS_SPEC,
     HCI_SUCCESS,
-    HCI_COMMAND_NAMES,
     HCI_Command,
     HCI_Reset_Command,
     HCI_Read_Local_Version_Information_Command,
@@ -179,8 +178,10 @@ RTK_USB_PRODUCTS = {
 # -----------------------------------------------------------------------------
 # HCI Commands
 # -----------------------------------------------------------------------------
-HCI_RTK_READ_ROM_VERSION_COMMAND = hci_command_op_code(0x3F, 0x6D)
-HCI_COMMAND_NAMES[HCI_RTK_READ_ROM_VERSION_COMMAND] = "HCI_RTK_READ_ROM_VERSION_COMMAND"
+HCI_RTK_READ_ROM_VERSION_COMMAND = hci_vendor_command_op_code(0x6D)
+HCI_RTK_DOWNLOAD_COMMAND = hci_vendor_command_op_code(0x20)
+HCI_RTK_DROP_FIRMWARE_COMMAND = hci_vendor_command_op_code(0x66)
+HCI_Command.register_commands(globals())
 
 
 @HCI_Command.command(return_parameters_fields=[("status", STATUS_SPEC), ("version", 1)])
@@ -188,10 +189,6 @@ class HCI_RTK_Read_ROM_Version_Command(HCI_Command):
     pass
 
 
-HCI_RTK_DOWNLOAD_COMMAND = hci_command_op_code(0x3F, 0x20)
-HCI_COMMAND_NAMES[HCI_RTK_DOWNLOAD_COMMAND] = "HCI_RTK_DOWNLOAD_COMMAND"
-
-
 @HCI_Command.command(
     fields=[("index", 1), ("payload", RTK_FRAGMENT_LENGTH)],
     return_parameters_fields=[("status", STATUS_SPEC), ("index", 1)],
@@ -200,10 +197,6 @@ class HCI_RTK_Download_Command(HCI_Command):
     pass
 
 
-HCI_RTK_DROP_FIRMWARE_COMMAND = hci_command_op_code(0x3F, 0x66)
-HCI_COMMAND_NAMES[HCI_RTK_DROP_FIRMWARE_COMMAND] = "HCI_RTK_DROP_FIRMWARE_COMMAND"
-
-
 @HCI_Command.command()
 class HCI_RTK_Drop_Firmware_Command(HCI_Command):
     pass
@@ -446,6 +439,11 @@ class Driver:
             # When the environment variable is set, don't look elsewhere
             return None
 
+        # Then, look where the firmware download tool writes by default
+        if (path := rtk_firmware_dir() / file_name).is_file():
+            logger.debug(f"{file_name} found in project data dir")
+            return path
+
         # Then, look in the package's driver directory
         if (path := pathlib.Path(__file__).parent / "rtk_fw" / file_name).is_file():
             logger.debug(f"{file_name} found in package dir")
@@ -646,3 +644,16 @@ class Driver:
         await self.download_firmware()
         await self.host.send_command(HCI_Reset_Command(), check_result=True)
         logger.info(f"loaded FW image {self.driver_info.fw_name}")
+
+
+def rtk_firmware_dir() -> pathlib.Path:
+    """
+    Returns:
+        A path to a subdir of the project data dir for Realtek firmware.
+         The directory is created if it doesn't exist.
+    """
+    from bumble.drivers import project_data_dir
+
+    p = project_data_dir() / "firmware" / "realtek"
+    p.mkdir(parents=True, exist_ok=True)
+    return p

bumble/gatt.py

@@ -28,7 +28,7 @@ import enum
 import functools
 import logging
 import struct
-from typing import Optional, Sequence, List
+from typing import Optional, Sequence, Iterable, List, Union
 
 from .colors import color
 from .core import UUID, get_dict_key_by_value
@@ -187,7 +187,7 @@ GATT_CENTRAL_ADDRESS_RESOLUTION__CHARACTERISTIC                = UUID.from_16_bi
 # -----------------------------------------------------------------------------
 
 
-def show_services(services):
+def show_services(services: Iterable[Service]) -> None:
     for service in services:
         print(color(str(service), 'cyan'))
 
@@ -210,11 +210,11 @@ class Service(Attribute):
 
     def __init__(
         self,
-        uuid,
+        uuid: Union[str, UUID],
         characteristics: List[Characteristic],
         primary=True,
         included_services: List[Service] = [],
-    ):
+    ) -> None:
         # Convert the uuid to a UUID object if it isn't already
         if isinstance(uuid, str):
             uuid = UUID(uuid)
@@ -239,7 +239,7 @@ class Service(Attribute):
         """
         return None
 
-    def __str__(self):
+    def __str__(self) -> str:
         return (
             f'Service(handle=0x{self.handle:04X}, '
             f'end=0x{self.end_group_handle:04X}, '
@@ -255,9 +255,11 @@ class TemplateService(Service):
     to expose their UUID as a class property
     '''
 
-    UUID: Optional[UUID] = None
+    UUID: UUID
 
-    def __init__(self, characteristics, primary=True):
+    def __init__(
+        self, characteristics: List[Characteristic], primary: bool = True
+    ) -> None:
         super().__init__(self.UUID, characteristics, primary)
 
 
@@ -269,7 +271,7 @@ class IncludedServiceDeclaration(Attribute):
 
     service: Service
 
-    def __init__(self, service):
+    def __init__(self, service: Service) -> None:
         declaration_bytes = struct.pack(
             '<HH2s', service.handle, service.end_group_handle, service.uuid.to_bytes()
         )
@@ -278,7 +280,7 @@ class IncludedServiceDeclaration(Attribute):
         )
         self.service = service
 
-    def __str__(self):
+    def __str__(self) -> str:
         return (
             f'IncludedServiceDefinition(handle=0x{self.handle:04X}, '
             f'group_starting_handle=0x{self.service.handle:04X}, '
@@ -326,7 +328,7 @@ class Characteristic(Attribute):
                     f"Characteristic.Properties::from_string() error:\nExpected a string containing any of the keys, separated by , or |: {enum_list_str}\nGot: {properties_str}"
                 )
 
-        def __str__(self):
+        def __str__(self) -> str:
             # NOTE: we override this method to offer a consistent result between python
             # versions: the value returned by IntFlag.__str__() changed in version 11.
             return '|'.join(
@@ -348,10 +350,10 @@ class Characteristic(Attribute):
 
     def __init__(
         self,
-        uuid,
+        uuid: Union[str, bytes, UUID],
         properties: Characteristic.Properties,
-        permissions,
-        value=b'',
+        permissions: Union[str, Attribute.Permissions],
+        value: Union[str, bytes, CharacteristicValue] = b'',
         descriptors: Sequence[Descriptor] = (),
     ):
         super().__init__(uuid, permissions, value)
@@ -369,7 +371,7 @@ class Characteristic(Attribute):
     def has_properties(self, properties: Characteristic.Properties) -> bool:
         return self.properties & properties == properties
 
-    def __str__(self):
+    def __str__(self) -> str:
         return (
             f'Characteristic(handle=0x{self.handle:04X}, '
             f'end=0x{self.end_group_handle:04X}, '
@@ -386,7 +388,7 @@ class CharacteristicDeclaration(Attribute):
 
     characteristic: Characteristic
 
-    def __init__(self, characteristic, value_handle):
+    def __init__(self, characteristic: Characteristic, value_handle: int) -> None:
         declaration_bytes = (
             struct.pack('<BH', characteristic.properties, value_handle)
             + characteristic.uuid.to_pdu_bytes()
@@ -397,7 +399,7 @@ class CharacteristicDeclaration(Attribute):
         self.value_handle = value_handle
         self.characteristic = characteristic
 
-    def __str__(self):
+    def __str__(self) -> str:
         return (
             f'CharacteristicDeclaration(handle=0x{self.handle:04X}, '
             f'value_handle=0x{self.value_handle:04X}, '
@@ -520,7 +522,7 @@ class CharacteristicAdapter:
 
         return self.wrapped_characteristic.unsubscribe(subscriber)
 
-    def __str__(self):
+    def __str__(self) -> str:
         wrapped = str(self.wrapped_characteristic)
         return f'{self.__class__.__name__}({wrapped})'
 
@@ -600,10 +602,10 @@ class UTF8CharacteristicAdapter(CharacteristicAdapter):
     Adapter that converts strings to/from bytes using UTF-8 encoding
     '''
 
-    def encode_value(self, value):
+    def encode_value(self, value: str) -> bytes:
         return value.encode('utf-8')
 
-    def decode_value(self, value):
+    def decode_value(self, value: bytes) -> str:
         return value.decode('utf-8')
 
 
@@ -613,7 +615,7 @@ class Descriptor(Attribute):
     See Vol 3, Part G - 3.3.3 Characteristic Descriptor Declarations
     '''
 
-    def __str__(self):
+    def __str__(self) -> str:
         return (
             f'Descriptor(handle=0x{self.handle:04X}, '
             f'type={self.type}, '

bumble/gatt_client.py

@@ -28,7 +28,18 @@ import asyncio
 import logging
 import struct
 from datetime import datetime
-from typing import List, Optional, Dict, Tuple, Callable, Union, Any
+from typing import (
+    List,
+    Optional,
+    Dict,
+    Tuple,
+    Callable,
+    Union,
+    Any,
+    Iterable,
+    Type,
+    TYPE_CHECKING,
+)
 
 from pyee import EventEmitter
 
@@ -66,8 +77,12 @@ from .gatt import (
     GATT_INCLUDE_ATTRIBUTE_TYPE,
     Characteristic,
     ClientCharacteristicConfigurationBits,
+    TemplateService,
 )
 
+if TYPE_CHECKING:
+    from bumble.device import Connection
+
 # -----------------------------------------------------------------------------
 # Logging
 # -----------------------------------------------------------------------------
@@ -78,16 +93,16 @@ logger = logging.getLogger(__name__)
 # Proxies
 # -----------------------------------------------------------------------------
 class AttributeProxy(EventEmitter):
-    client: Client
-
-    def __init__(self, client, handle, end_group_handle, attribute_type):
+    def __init__(
+        self, client: Client, handle: int, end_group_handle: int, attribute_type: UUID
+    ) -> None:
         EventEmitter.__init__(self)
         self.client = client
         self.handle = handle
         self.end_group_handle = end_group_handle
         self.type = attribute_type
 
-    async def read_value(self, no_long_read=False):
+    async def read_value(self, no_long_read: bool = False) -> bytes:
         return self.decode_value(
             await self.client.read_value(self.handle, no_long_read)
         )
@@ -97,13 +112,13 @@ class AttributeProxy(EventEmitter):
             self.handle, self.encode_value(value), with_response
         )
 
-    def encode_value(self, value):
+    def encode_value(self, value: Any) -> bytes:
         return value
 
-    def decode_value(self, value_bytes):
+    def decode_value(self, value_bytes: bytes) -> Any:
         return value_bytes
 
-    def __str__(self):
+    def __str__(self) -> str:
         return f'Attribute(handle=0x{self.handle:04X}, type={self.type})'
 
 
@@ -136,14 +151,14 @@ class ServiceProxy(AttributeProxy):
     def get_characteristics_by_uuid(self, uuid):
         return self.client.get_characteristics_by_uuid(uuid, self)
 
-    def __str__(self):
+    def __str__(self) -> str:
         return f'Service(handle=0x{self.handle:04X}, uuid={self.uuid})'
 
 
 class CharacteristicProxy(AttributeProxy):
     properties: Characteristic.Properties
     descriptors: List[DescriptorProxy]
-    subscribers: Dict[Any, Callable]
+    subscribers: Dict[Any, Callable[[bytes], Any]]
 
     def __init__(
         self,
@@ -171,7 +186,9 @@ class CharacteristicProxy(AttributeProxy):
         return await self.client.discover_descriptors(self)
 
     async def subscribe(
-        self, subscriber: Optional[Callable] = None, prefer_notify=True
+        self,
+        subscriber: Optional[Callable[[bytes], Any]] = None,
+        prefer_notify: bool = True,
     ):
         if subscriber is not None:
             if subscriber in self.subscribers:
@@ -195,7 +212,7 @@ class CharacteristicProxy(AttributeProxy):
 
         return await self.client.unsubscribe(self, subscriber)
 
-    def __str__(self):
+    def __str__(self) -> str:
         return (
             f'Characteristic(handle=0x{self.handle:04X}, '
             f'uuid={self.uuid}, '
@@ -207,7 +224,7 @@ class DescriptorProxy(AttributeProxy):
     def __init__(self, client, handle, descriptor_type):
         super().__init__(client, handle, 0, descriptor_type)
 
-    def __str__(self):
+    def __str__(self) -> str:
         return f'Descriptor(handle=0x{self.handle:04X}, type={self.type})'
 
 
@@ -216,8 +233,10 @@ class ProfileServiceProxy:
     Base class for profile-specific service proxies
     '''
 
+    SERVICE_CLASS: Type[TemplateService]
+
     @classmethod
-    def from_client(cls, client):
+    def from_client(cls, client: Client) -> ProfileServiceProxy:
         return ServiceProxy.from_client(cls, client, cls.SERVICE_CLASS.UUID)
 
 
@@ -227,8 +246,12 @@ class ProfileServiceProxy:
 class Client:
     services: List[ServiceProxy]
     cached_values: Dict[int, Tuple[datetime, bytes]]
+    notification_subscribers: Dict[int, Callable[[bytes], Any]]
+    indication_subscribers: Dict[int, Callable[[bytes], Any]]
+    pending_response: Optional[asyncio.futures.Future[ATT_PDU]]
+    pending_request: Optional[ATT_PDU]
 
-    def __init__(self, connection):
+    def __init__(self, connection: Connection) -> None:
         self.connection = connection
         self.mtu_exchange_done = False
         self.request_semaphore = asyncio.Semaphore(1)
@@ -241,16 +264,16 @@ class Client:
         self.services = []
         self.cached_values = {}
 
-    def send_gatt_pdu(self, pdu):
+    def send_gatt_pdu(self, pdu: bytes) -> None:
         self.connection.send_l2cap_pdu(ATT_CID, pdu)
 
-    async def send_command(self, command):
+    async def send_command(self, command: ATT_PDU) -> None:
         logger.debug(
             f'GATT Command from client: [0x{self.connection.handle:04X}] {command}'
         )
         self.send_gatt_pdu(command.to_bytes())
 
-    async def send_request(self, request):
+    async def send_request(self, request: ATT_PDU):
         logger.debug(
             f'GATT Request from client: [0x{self.connection.handle:04X}] {request}'
         )
@@ -279,14 +302,14 @@ class Client:
 
         return response
 
-    def send_confirmation(self, confirmation):
+    def send_confirmation(self, confirmation: ATT_Handle_Value_Confirmation) -> None:
         logger.debug(
             f'GATT Confirmation from client: [0x{self.connection.handle:04X}] '
             f'{confirmation}'
         )
         self.send_gatt_pdu(confirmation.to_bytes())
 
-    async def request_mtu(self, mtu):
+    async def request_mtu(self, mtu: int) -> int:
         # Check the range
         if mtu < ATT_DEFAULT_MTU:
             raise ValueError(f'MTU must be >= {ATT_DEFAULT_MTU}')
@@ -313,10 +336,12 @@ class Client:
 
         return self.connection.att_mtu
 
-    def get_services_by_uuid(self, uuid):
+    def get_services_by_uuid(self, uuid: UUID) -> List[ServiceProxy]:
         return [service for service in self.services if service.uuid == uuid]
 
-    def get_characteristics_by_uuid(self, uuid, service=None):
+    def get_characteristics_by_uuid(
+        self, uuid: UUID, service: Optional[ServiceProxy] = None
+    ) -> List[CharacteristicProxy]:
         services = [service] if service else self.services
         return [
             c
@@ -363,7 +388,7 @@ class Client:
         if not already_known:
             self.services.append(service)
 
-    async def discover_services(self, uuids=None) -> List[ServiceProxy]:
+    async def discover_services(self, uuids: Iterable[UUID] = []) -> List[ServiceProxy]:
         '''
         See Vol 3, Part G - 4.4.1 Discover All Primary Services
         '''
@@ -435,7 +460,7 @@ class Client:
 
         return services
 
-    async def discover_service(self, uuid):
+    async def discover_service(self, uuid: Union[str, UUID]) -> List[ServiceProxy]:
         '''
         See Vol 3, Part G - 4.4.2 Discover Primary Service by Service UUID
         '''
@@ -468,7 +493,7 @@ class Client:
                         f'{HCI_Constant.error_name(response.error_code)}'
                     )
                     # TODO raise appropriate exception
-                    return
+                    return []
                 break
 
             for attribute_handle, end_group_handle in response.handles_information:
@@ -480,7 +505,7 @@ class Client:
                     logger.warning(
                         f'bogus handle values: {attribute_handle} {end_group_handle}'
                     )
-                    return
+                    return []
 
                 # Create a service proxy for this service
                 service = ServiceProxy(
@@ -721,7 +746,7 @@ class Client:
 
         return descriptors
 
-    async def discover_attributes(self):
+    async def discover_attributes(self) -> List[AttributeProxy]:
         '''
         Discover all attributes, regardless of type
         '''
@@ -844,7 +869,9 @@ class Client:
             # No more subscribers left
             await self.write_value(cccd, b'\x00\x00', with_response=True)
 
-    async def read_value(self, attribute, no_long_read=False):
+    async def read_value(
+        self, attribute: Union[int, AttributeProxy], no_long_read: bool = False
+    ) -> Any:
         '''
         See Vol 3, Part G - 4.8.1 Read Characteristic Value
 
@@ -905,7 +932,9 @@ class Client:
         # Return the value as bytes
         return attribute_value
 
-    async def read_characteristics_by_uuid(self, uuid, service):
+    async def read_characteristics_by_uuid(
+        self, uuid: UUID, service: Optional[ServiceProxy]
+    ) -> List[bytes]:
         '''
         See Vol 3, Part G - 4.8.2 Read Using Characteristic UUID
         '''
@@ -960,7 +989,12 @@ class Client:
 
         return characteristics_values
 
-    async def write_value(self, attribute, value, with_response=False):
+    async def write_value(
+        self,
+        attribute: Union[int, AttributeProxy],
+        value: bytes,
+        with_response: bool = False,
+    ) -> None:
         '''
         See Vol 3, Part G - 4.9.1 Write Without Response & 4.9.3 Write Characteristic
         Value
@@ -990,7 +1024,7 @@ class Client:
                 )
             )
 
-    def on_gatt_pdu(self, att_pdu):
+    def on_gatt_pdu(self, att_pdu: ATT_PDU) -> None:
         logger.debug(
             f'GATT Response to client: [0x{self.connection.handle:04X}] {att_pdu}'
         )
@@ -1013,6 +1047,7 @@ class Client:
                     return
 
             # Return the response to the coroutine that is waiting for it
+            assert self.pending_response is not None
             self.pending_response.set_result(att_pdu)
         else:
             handler_name = f'on_{att_pdu.name.lower()}'
@@ -1060,7 +1095,7 @@ class Client:
         # Confirm that we received the indication
         self.send_confirmation(ATT_Handle_Value_Confirmation())
 
-    def cache_value(self, attribute_handle: int, value: bytes):
+    def cache_value(self, attribute_handle: int, value: bytes) -> None:
         self.cached_values[attribute_handle] = (
             datetime.now(),
             value,

bumble/gatt_server.py

@@ -23,11 +23,12 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+from __future__ import annotations
 import asyncio
 import logging
 from collections import defaultdict
 import struct
-from typing import List, Tuple, Optional, TypeVar, Type
+from typing import List, Tuple, Optional, TypeVar, Type, Dict, Iterable, TYPE_CHECKING
 from pyee import EventEmitter
 
 from .colors import color
@@ -42,6 +43,7 @@ from .att import (
     ATT_INVALID_OFFSET_ERROR,
     ATT_REQUEST_NOT_SUPPORTED_ERROR,
     ATT_REQUESTS,
+    ATT_PDU,
     ATT_UNLIKELY_ERROR_ERROR,
     ATT_UNSUPPORTED_GROUP_TYPE_ERROR,
     ATT_Error,
@@ -73,6 +75,8 @@ from .gatt import (
     Service,
 )
 
+if TYPE_CHECKING:
+    from bumble.device import Device, Connection
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -91,8 +95,13 @@ GATT_SERVER_DEFAULT_MAX_MTU = 517
 # -----------------------------------------------------------------------------
 class Server(EventEmitter):
     attributes: List[Attribute]
+    services: List[Service]
+    attributes_by_handle: Dict[int, Attribute]
+    subscribers: Dict[int, Dict[int, bytes]]
+    indication_semaphores: defaultdict[int, asyncio.Semaphore]
+    pending_confirmations: defaultdict[int, Optional[asyncio.futures.Future]]
 
-    def __init__(self, device):
+    def __init__(self, device: Device) -> None:
         super().__init__()
         self.device = device
         self.services = []
@@ -107,16 +116,16 @@ class Server(EventEmitter):
         self.indication_semaphores = defaultdict(lambda: asyncio.Semaphore(1))
         self.pending_confirmations = defaultdict(lambda: None)
 
-    def __str__(self):
+    def __str__(self) -> str:
         return "\n".join(map(str, self.attributes))
 
-    def send_gatt_pdu(self, connection_handle, pdu):
+    def send_gatt_pdu(self, connection_handle: int, pdu: bytes) -> None:
         self.device.send_l2cap_pdu(connection_handle, ATT_CID, pdu)
 
-    def next_handle(self):
+    def next_handle(self) -> int:
         return 1 + len(self.attributes)
 
-    def get_advertising_service_data(self):
+    def get_advertising_service_data(self) -> Dict[Attribute, bytes]:
         return {
             attribute: data
             for attribute in self.attributes
@@ -124,7 +133,7 @@ class Server(EventEmitter):
             and (data := attribute.get_advertising_data())
         }
 
-    def get_attribute(self, handle):
+    def get_attribute(self, handle: int) -> Optional[Attribute]:
         attribute = self.attributes_by_handle.get(handle)
         if attribute:
             return attribute
@@ -173,12 +182,17 @@ class Server(EventEmitter):
 
         return next(
             (
-                (attribute, self.get_attribute(attribute.characteristic.handle))
+                (
+                    attribute,
+                    self.get_attribute(attribute.characteristic.handle),
+                )  # type: ignore
                 for attribute in map(
                     self.get_attribute,
                     range(service_handle.handle, service_handle.end_group_handle + 1),
                 )
-                if attribute.type == GATT_CHARACTERISTIC_ATTRIBUTE_TYPE
+                if attribute is not None
+                and attribute.type == GATT_CHARACTERISTIC_ATTRIBUTE_TYPE
+                and isinstance(attribute, CharacteristicDeclaration)
                 and attribute.characteristic.uuid == characteristic_uuid
             ),
             None,
@@ -197,7 +211,7 @@ class Server(EventEmitter):
 
         return next(
             (
-                attribute
+                attribute  # type: ignore
                 for attribute in map(
                     self.get_attribute,
                     range(
@@ -205,12 +219,12 @@ class Server(EventEmitter):
                         characteristic_value.end_group_handle + 1,
                     ),
                 )
-                if attribute.type == descriptor_uuid
+                if attribute is not None and attribute.type == descriptor_uuid
             ),
             None,
         )
 
-    def add_attribute(self, attribute):
+    def add_attribute(self, attribute: Attribute) -> None:
         # Assign a handle to this attribute
         attribute.handle = self.next_handle()
         attribute.end_group_handle = (
@@ -220,7 +234,7 @@ class Server(EventEmitter):
         # Add this attribute to the list
         self.attributes.append(attribute)
 
-    def add_service(self, service: Service):
+    def add_service(self, service: Service) -> None:
         # Add the service attribute to the DB
         self.add_attribute(service)
 
@@ -285,11 +299,13 @@ class Server(EventEmitter):
         service.end_group_handle = self.attributes[-1].handle
         self.services.append(service)
 
-    def add_services(self, services):
+    def add_services(self, services: Iterable[Service]) -> None:
         for service in services:
             self.add_service(service)
 
-    def read_cccd(self, connection, characteristic):
+    def read_cccd(
+        self, connection: Optional[Connection], characteristic: Characteristic
+    ) -> bytes:
         if connection is None:
             return bytes([0, 0])
 
@@ -300,7 +316,12 @@ class Server(EventEmitter):
 
         return cccd or bytes([0, 0])
 
-    def write_cccd(self, connection, characteristic, value):
+    def write_cccd(
+        self,
+        connection: Connection,
+        characteristic: Characteristic,
+        value: bytes,
+    ) -> None:
         logger.debug(
             f'Subscription update for connection=0x{connection.handle:04X}, '
             f'handle=0x{characteristic.handle:04X}: {value.hex()}'
@@ -327,13 +348,19 @@ class Server(EventEmitter):
             indicate_enabled,
         )
 
-    def send_response(self, connection, response):
+    def send_response(self, connection: Connection, response: ATT_PDU) -> None:
         logger.debug(
             f'GATT Response from server: [0x{connection.handle:04X}] {response}'
         )
         self.send_gatt_pdu(connection.handle, response.to_bytes())
 
-    async def notify_subscriber(self, connection, attribute, value=None, force=False):
+    async def notify_subscriber(
+        self,
+        connection: Connection,
+        attribute: Attribute,
+        value: Optional[bytes] = None,
+        force: bool = False,
+    ) -> None:
         # Check if there's a subscriber
         if not force:
             subscribers = self.subscribers.get(connection.handle)
@@ -370,7 +397,13 @@ class Server(EventEmitter):
         )
         self.send_gatt_pdu(connection.handle, bytes(notification))
 
-    async def indicate_subscriber(self, connection, attribute, value=None, force=False):
+    async def indicate_subscriber(
+        self,
+        connection: Connection,
+        attribute: Attribute,
+        value: Optional[bytes] = None,
+        force: bool = False,
+    ) -> None:
         # Check if there's a subscriber
         if not force:
             subscribers = self.subscribers.get(connection.handle)
@@ -411,15 +444,13 @@ class Server(EventEmitter):
             assert self.pending_confirmations[connection.handle] is None
 
             # Create a future value to hold the eventual response
-            self.pending_confirmations[
+            pending_confirmation = self.pending_confirmations[
                 connection.handle
             ] = asyncio.get_running_loop().create_future()
 
             try:
                 self.send_gatt_pdu(connection.handle, indication.to_bytes())
-                await asyncio.wait_for(
-                    self.pending_confirmations[connection.handle], GATT_REQUEST_TIMEOUT
-                )
+                await asyncio.wait_for(pending_confirmation, GATT_REQUEST_TIMEOUT)
             except asyncio.TimeoutError as error:
                 logger.warning(color('!!! GATT Indicate timeout', 'red'))
                 raise TimeoutError(f'GATT timeout for {indication.name}') from error
@@ -427,8 +458,12 @@ class Server(EventEmitter):
                 self.pending_confirmations[connection.handle] = None
 
     async def notify_or_indicate_subscribers(
-        self, indicate, attribute, value=None, force=False
-    ):
+        self,
+        indicate: bool,
+        attribute: Attribute,
+        value: Optional[bytes] = None,
+        force: bool = False,
+    ) -> None:
         # Get all the connections for which there's at least one subscription
         connections = [
             connection
@@ -450,13 +485,23 @@ class Server(EventEmitter):
                 ]
             )
 
-    async def notify_subscribers(self, attribute, value=None, force=False):
+    async def notify_subscribers(
+        self,
+        attribute: Attribute,
+        value: Optional[bytes] = None,
+        force: bool = False,
+    ):
         return await self.notify_or_indicate_subscribers(False, attribute, value, force)
 
-    async def indicate_subscribers(self, attribute, value=None, force=False):
+    async def indicate_subscribers(
+        self,
+        attribute: Attribute,
+        value: Optional[bytes] = None,
+        force: bool = False,
+    ):
         return await self.notify_or_indicate_subscribers(True, attribute, value, force)
 
-    def on_disconnection(self, connection):
+    def on_disconnection(self, connection: Connection) -> None:
         if connection.handle in self.subscribers:
             del self.subscribers[connection.handle]
         if connection.handle in self.indication_semaphores:
@@ -464,7 +509,7 @@ class Server(EventEmitter):
         if connection.handle in self.pending_confirmations:
             del self.pending_confirmations[connection.handle]
 
-    def on_gatt_pdu(self, connection, att_pdu):
+    def on_gatt_pdu(self, connection: Connection, att_pdu: ATT_PDU) -> None:
         logger.debug(f'GATT Request to server: [0x{connection.handle:04X}] {att_pdu}')
         handler_name = f'on_{att_pdu.name.lower()}'
         handler = getattr(self, handler_name, None)
@@ -506,7 +551,7 @@ class Server(EventEmitter):
     #######################################################
     # ATT handlers
     #######################################################
-    def on_att_request(self, connection, pdu):
+    def on_att_request(self, connection: Connection, pdu: ATT_PDU) -> None:
         '''
         Handler for requests without a more specific handler
         '''
@@ -679,7 +724,6 @@ class Server(EventEmitter):
             and attribute.handle <= request.ending_handle
             and pdu_space_available
         ):
-
             try:
                 attribute_value = attribute.read_value(connection)
             except ATT_Error as error:

bumble/hci.py

@@ -16,11 +16,11 @@
 # Imports
 # -----------------------------------------------------------------------------
 from __future__ import annotations
-import struct
 import collections
-import logging
 import functools
-from typing import Dict, Type, Union, Callable, Any, Optional
+import logging
+import struct
+from typing import Any, Dict, Callable, Optional, Type, Union
 
 from .colors import color
 from .core import (
@@ -47,6 +47,10 @@ def hci_command_op_code(ogf, ocf):
     return ogf << 10 | ocf
 
 
+def hci_vendor_command_op_code(ocf):
+    return hci_command_op_code(HCI_VENDOR_OGF, ocf)
+
+
 def key_with_value(dictionary, target_value):
     for key, value in dictionary.items():
         if value == target_value:
@@ -101,6 +105,8 @@ def phy_list_to_bits(phys):
 # fmt: off
 # pylint: disable=line-too-long
 
+HCI_VENDOR_OGF = 0x3F
+
 # HCI Version
 HCI_VERSION_BLUETOOTH_CORE_1_0B    = 0
 HCI_VERSION_BLUETOOTH_CORE_1_1     = 1
@@ -206,10 +212,8 @@ HCI_INQUIRY_RESPONSE_NOTIFICATION_EVENT                          = 0X56
 HCI_AUTHENTICATED_PAYLOAD_TIMEOUT_EXPIRED_EVENT                  = 0X57
 HCI_SAM_STATUS_CHANGE_EVENT                                      = 0X58
 
-HCI_EVENT_NAMES = {
-    event_code: event_name for (event_name, event_code) in globals().items()
-    if event_name.startswith('HCI_') and event_name.endswith('_EVENT')
-}
+HCI_VENDOR_EVENT = 0xFF
+
 
 # HCI Subevent Codes
 HCI_LE_CONNECTION_COMPLETE_EVENT                         = 0x01
@@ -248,10 +252,6 @@ HCI_LE_TRANSMIT_POWER_REPORTING_EVENT                    = 0X21
 HCI_LE_BIGINFO_ADVERTISING_REPORT_EVENT                  = 0X22
 HCI_LE_SUBRATE_CHANGE_EVENT                              = 0X23
 
-HCI_SUBEVENT_NAMES = {
-    event_code: event_name for (event_name, event_code) in globals().items()
-    if event_name.startswith('HCI_LE_') and event_name.endswith('_EVENT') and event_code != HCI_LE_META_EVENT
-}
 
 # HCI Command
 HCI_INQUIRY_COMMAND                                                      = hci_command_op_code(0x01, 0x0001)
@@ -557,10 +557,6 @@ HCI_LE_SET_DATA_RELATED_ADDRESS_CHANGES_COMMAND                          = hci_c
 HCI_LE_SET_DEFAULT_SUBRATE_COMMAND                                       = hci_command_op_code(0x08, 0x007D)
 HCI_LE_SUBRATE_REQUEST_COMMAND                                           = hci_command_op_code(0x08, 0x007E)
 
-HCI_COMMAND_NAMES = {
-    command_code: command_name for (command_name, command_code) in globals().items()
-    if command_name.startswith('HCI_') and command_name.endswith('_COMMAND')
-}
 
 # HCI Error Codes
 # See Bluetooth spec Vol 2, Part D - 1.3 LIST OF ERROR CODES
@@ -1960,6 +1956,7 @@ class HCI_Command(HCI_Packet):
     '''
 
     hci_packet_type = HCI_COMMAND_PACKET
+    command_names: Dict[int, str] = {}
     command_classes: Dict[int, Type[HCI_Command]] = {}
 
     @staticmethod
@@ -1970,9 +1967,9 @@ class HCI_Command(HCI_Packet):
 
         def inner(cls):
             cls.name = cls.__name__.upper()
-            cls.op_code = key_with_value(HCI_COMMAND_NAMES, cls.name)
+            cls.op_code = key_with_value(cls.command_names, cls.name)
             if cls.op_code is None:
-                raise KeyError(f'command {cls.name} not found in HCI_COMMAND_NAMES')
+                raise KeyError(f'command {cls.name} not found in command_names')
             cls.fields = fields
             cls.return_parameters_fields = return_parameters_fields
 
@@ -1991,6 +1988,18 @@ class HCI_Command(HCI_Packet):
 
         return inner
 
+    @staticmethod
+    def command_map(symbols: Dict[str, Any]) -> Dict[int, str]:
+        return {
+            command_code: command_name
+            for (command_name, command_code) in symbols.items()
+            if command_name.startswith('HCI_') and command_name.endswith('_COMMAND')
+        }
+
+    @classmethod
+    def register_commands(cls, symbols: Dict[str, Any]) -> None:
+        cls.command_names.update(cls.command_map(symbols))
+
     @staticmethod
     def from_bytes(packet: bytes) -> HCI_Command:
         op_code, length = struct.unpack_from('<HB', packet, 1)
@@ -2015,7 +2024,7 @@ class HCI_Command(HCI_Packet):
 
     @staticmethod
     def command_name(op_code):
-        name = HCI_COMMAND_NAMES.get(op_code)
+        name = HCI_Command.command_names.get(op_code)
         if name is not None:
             return name
         return f'[OGF=0x{op_code >> 10:02x}, OCF=0x{op_code & 0x3FF:04x}]'
@@ -2024,6 +2033,16 @@ class HCI_Command(HCI_Packet):
     def create_return_parameters(cls, **kwargs):
         return HCI_Object(cls.return_parameters_fields, **kwargs)
 
+    @classmethod
+    def parse_return_parameters(cls, parameters):
+        if not cls.return_parameters_fields:
+            return None
+        return_parameters = HCI_Object.from_bytes(
+            parameters, 0, cls.return_parameters_fields
+        )
+        return_parameters.fields = cls.return_parameters_fields
+        return return_parameters
+
     def __init__(self, op_code, parameters=None, **kwargs):
         super().__init__(HCI_Command.command_name(op_code))
         if (fields := getattr(self, 'fields', None)) and kwargs:
@@ -2053,6 +2072,9 @@ class HCI_Command(HCI_Packet):
         return result
 
 
+HCI_Command.register_commands(globals())
+
+
 # -----------------------------------------------------------------------------
 @HCI_Command.command(
     [
@@ -4308,8 +4330,8 @@ class HCI_Event(HCI_Packet):
     '''
 
     hci_packet_type = HCI_EVENT_PACKET
+    event_names: Dict[int, str] = {}
     event_classes: Dict[int, Type[HCI_Event]] = {}
-    meta_event_classes: Dict[int, Type[HCI_LE_Meta_Event]] = {}
 
     @staticmethod
     def event(fields=()):
@@ -4319,9 +4341,9 @@ class HCI_Event(HCI_Packet):
 
         def inner(cls):
             cls.name = cls.__name__.upper()
-            cls.event_code = key_with_value(HCI_EVENT_NAMES, cls.name)
+            cls.event_code = key_with_value(cls.event_names, cls.name)
             if cls.event_code is None:
-                raise KeyError('event not found in HCI_EVENT_NAMES')
+                raise KeyError(f'event {cls.name} not found in event_names')
             cls.fields = fields
 
             # Patch the __init__ method to fix the event_code
@@ -4337,12 +4359,30 @@ class HCI_Event(HCI_Packet):
 
         return inner
 
+    @staticmethod
+    def event_map(symbols: Dict[str, Any]) -> Dict[int, str]:
+        return {
+            event_code: event_name
+            for (event_name, event_code) in symbols.items()
+            if event_name.startswith('HCI_')
+            and not event_name.startswith('HCI_LE_')
+            and event_name.endswith('_EVENT')
+        }
+
+    @staticmethod
+    def event_name(event_code):
+        return name_or_number(HCI_Event.event_names, event_code)
+
+    @staticmethod
+    def register_events(symbols: Dict[str, Any]) -> None:
+        HCI_Event.event_names.update(HCI_Event.event_map(symbols))
+
     @staticmethod
     def registered(event_class):
         event_class.name = event_class.__name__.upper()
-        event_class.event_code = key_with_value(HCI_EVENT_NAMES, event_class.name)
+        event_class.event_code = key_with_value(HCI_Event.event_names, event_class.name)
         if event_class.event_code is None:
-            raise KeyError('event not found in HCI_EVENT_NAMES')
+            raise KeyError(f'event {event_class.name} not found in event_names')
 
         # Register a factory for this class
         HCI_Event.event_classes[event_class.event_code] = event_class
@@ -4357,16 +4397,21 @@ class HCI_Event(HCI_Packet):
         if len(parameters) != length:
             raise ValueError('invalid packet length')
 
-        cls: Type[HCI_Event | HCI_LE_Meta_Event] | None
+        cls: Any
         if event_code == HCI_LE_META_EVENT:
             # We do this dispatch here and not in the subclass in order to avoid call
             # loops
             subevent_code = parameters[0]
-            cls = HCI_Event.meta_event_classes.get(subevent_code)
+            cls = HCI_LE_Meta_Event.subevent_classes.get(subevent_code)
             if cls is None:
                 # No class registered, just use a generic class instance
                 return HCI_LE_Meta_Event(subevent_code, parameters)
-
+        elif event_code == HCI_VENDOR_EVENT:
+            subevent_code = parameters[0]
+            cls = HCI_Vendor_Event.subevent_classes.get(subevent_code)
+            if cls is None:
+                # No class registered, just use a generic class instance
+                return HCI_Vendor_Event(subevent_code, parameters)
         else:
             cls = HCI_Event.event_classes.get(event_code)
             if cls is None:
@@ -4384,10 +4429,6 @@ class HCI_Event(HCI_Packet):
             HCI_Object.init_from_bytes(self, parameters, 0, fields)
         return self
 
-    @staticmethod
-    def event_name(event_code):
-        return name_or_number(HCI_EVENT_NAMES, event_code)
-
     def __init__(self, event_code, parameters=None, **kwargs):
         super().__init__(HCI_Event.event_name(event_code))
         if (fields := getattr(self, 'fields', None)) and kwargs:
@@ -4414,71 +4455,111 @@ class HCI_Event(HCI_Packet):
         return result
 
 
+HCI_Event.register_events(globals())
+
+
 # -----------------------------------------------------------------------------
-class HCI_LE_Meta_Event(HCI_Event):
+class HCI_Extended_Event(HCI_Event):
     '''
-    See Bluetooth spec @ 7.7.65 LE Meta Event
+    HCI_Event subclass for events that has a subevent code.
     '''
 
-    @staticmethod
-    def event(fields=()):
+    subevent_names: Dict[int, str] = {}
+    subevent_classes: Dict[int, Type[HCI_Extended_Event]]
+
+    @classmethod
+    def event(cls, fields=()):
         '''
         Decorator used to declare and register subclasses
         '''
 
         def inner(cls):
             cls.name = cls.__name__.upper()
-            cls.subevent_code = key_with_value(HCI_SUBEVENT_NAMES, cls.name)
+            cls.subevent_code = key_with_value(cls.subevent_names, cls.name)
             if cls.subevent_code is None:
-                raise KeyError('subevent not found in HCI_SUBEVENT_NAMES')
+                raise KeyError(f'subevent {cls.name} not found in subevent_names')
             cls.fields = fields
 
             # Patch the __init__ method to fix the subevent_code
+            original_init = cls.__init__
+
             def init(self, parameters=None, **kwargs):
-                return HCI_LE_Meta_Event.__init__(
-                    self, cls.subevent_code, parameters, **kwargs
-                )
+                return original_init(self, cls.subevent_code, parameters, **kwargs)
 
             cls.__init__ = init
 
             # Register a factory for this class
-            HCI_Event.meta_event_classes[cls.subevent_code] = cls
+            cls.subevent_classes[cls.subevent_code] = cls
 
             return cls
 
         return inner
 
+    @classmethod
+    def subevent_name(cls, subevent_code):
+        subevent_name = cls.subevent_names.get(subevent_code)
+        if subevent_name is not None:
+            return subevent_name
+
+        return f'{cls.__name__.upper()}[0x{subevent_code:02X}]'
+
+    @staticmethod
+    def subevent_map(symbols: Dict[str, Any]) -> Dict[int, str]:
+        return {
+            subevent_code: subevent_name
+            for (subevent_name, subevent_code) in symbols.items()
+            if subevent_name.startswith('HCI_') and subevent_name.endswith('_EVENT')
+        }
+
+    @classmethod
+    def register_subevents(cls, symbols: Dict[str, Any]) -> None:
+        cls.subevent_names.update(cls.subevent_map(symbols))
+
     @classmethod
     def from_parameters(cls, parameters):
         self = cls.__new__(cls)
-        HCI_LE_Meta_Event.__init__(self, self.subevent_code, parameters)
+        HCI_Extended_Event.__init__(self, self.subevent_code, parameters)
         if fields := getattr(self, 'fields', None):
             HCI_Object.init_from_bytes(self, parameters, 1, fields)
         return self
 
-    @staticmethod
-    def subevent_name(subevent_code):
-        return name_or_number(HCI_SUBEVENT_NAMES, subevent_code)
-
     def __init__(self, subevent_code, parameters, **kwargs):
         self.subevent_code = subevent_code
         if parameters is None and (fields := getattr(self, 'fields', None)) and kwargs:
             parameters = bytes([subevent_code]) + HCI_Object.dict_to_bytes(
                 kwargs, fields
             )
-        super().__init__(HCI_LE_META_EVENT, parameters, **kwargs)
+        super().__init__(self.event_code, parameters, **kwargs)
 
         # Override the name in order to adopt the subevent name instead
         self.name = self.subevent_name(subevent_code)
 
-    def __str__(self):
-        result = color(self.subevent_name(self.subevent_code), 'magenta')
-        if fields := getattr(self, 'fields', None):
-            result += ':\n' + HCI_Object.format_fields(self.__dict__, fields, '  ')
-        else:
-            if self.parameters:
-                result += f': {self.parameters.hex()}'
-        return result
+
+# -----------------------------------------------------------------------------
+class HCI_LE_Meta_Event(HCI_Extended_Event):
+    '''
+    See Bluetooth spec @ 7.7.65 LE Meta Event
+    '''
+
+    event_code: int = HCI_LE_META_EVENT
+    subevent_classes = {}
+
+    @staticmethod
+    def subevent_map(symbols: Dict[str, Any]) -> Dict[int, str]:
+        return {
+            subevent_code: subevent_name
+            for (subevent_name, subevent_code) in symbols.items()
+            if subevent_name.startswith('HCI_LE_') and subevent_name.endswith('_EVENT')
+        }
+
+
+HCI_LE_Meta_Event.register_subevents(globals())
+
+
+# -----------------------------------------------------------------------------
+class HCI_Vendor_Event(HCI_Extended_Event):
+    event_code: int = HCI_VENDOR_EVENT
+    subevent_classes = {}
 
 
 # -----------------------------------------------------------------------------
@@ -4592,7 +4673,7 @@ class HCI_LE_Advertising_Report_Event(HCI_LE_Meta_Event):
         return f'{color(self.subevent_name(self.subevent_code), "magenta")}:\n{reports}'
 
 
-HCI_Event.meta_event_classes[
+HCI_LE_Meta_Event.subevent_classes[
     HCI_LE_ADVERTISING_REPORT_EVENT
 ] = HCI_LE_Advertising_Report_Event
 
@@ -4846,7 +4927,7 @@ class HCI_LE_Extended_Advertising_Report_Event(HCI_LE_Meta_Event):
         return f'{color(self.subevent_name(self.subevent_code), "magenta")}:\n{reports}'
 
 
-HCI_Event.meta_event_classes[
+HCI_LE_Meta_Event.subevent_classes[
     HCI_LE_EXTENDED_ADVERTISING_REPORT_EVENT
 ] = HCI_LE_Extended_Advertising_Report_Event
 
@@ -5120,11 +5201,11 @@ class HCI_Command_Complete_Event(HCI_Event):
             self.return_parameters = self.return_parameters[0]
         else:
             cls = HCI_Command.command_classes.get(self.command_opcode)
-            if cls and cls.return_parameters_fields:
-                self.return_parameters = HCI_Object.from_bytes(
-                    self.return_parameters, 0, cls.return_parameters_fields
-                )
-                self.return_parameters.fields = cls.return_parameters_fields
+            if cls:
+                # Try to parse the return parameters bytes into an object.
+                return_parameters = cls.parse_return_parameters(self.return_parameters)
+                if return_parameters is not None:
+                    self.return_parameters = return_parameters
 
         return self
 

bumble/hfp.py

@@ -15,16 +15,19 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+import collections.abc
 import logging
 import asyncio
 import dataclasses
 import enum
 import traceback
-from typing import Dict, List, Union, Set
+import warnings
+from typing import Dict, List, Union, Set, TYPE_CHECKING
 
 from . import at
 from . import rfcomm
 
+from bumble.colors import color
 from bumble.core import (
     ProtocolError,
     BT_GENERIC_AUDIO_SERVICE,
@@ -48,6 +51,71 @@ from bumble.sdp import (
 # -----------------------------------------------------------------------------
 logger = logging.getLogger(__name__)
 
+# -----------------------------------------------------------------------------
+# Error
+# -----------------------------------------------------------------------------
+
+
+class HfpProtocolError(ProtocolError):
+    def __init__(self, error_name: str = '', details: str = ''):
+        super().__init__(None, 'hfp', error_name, details)
+
+
+# -----------------------------------------------------------------------------
+# Protocol Support
+# -----------------------------------------------------------------------------
+
+# -----------------------------------------------------------------------------
+class HfpProtocol:
+    dlc: rfcomm.DLC
+    buffer: str
+    lines: collections.deque
+    lines_available: asyncio.Event
+
+    def __init__(self, dlc: rfcomm.DLC) -> None:
+        warnings.warn("See HfProtocol", DeprecationWarning)
+        self.dlc = dlc
+        self.buffer = ''
+        self.lines = collections.deque()
+        self.lines_available = asyncio.Event()
+
+        dlc.sink = self.feed
+
+    def feed(self, data: Union[bytes, str]) -> None:
+        # Convert the data to a string if needed
+        if isinstance(data, bytes):
+            data = data.decode('utf-8')
+
+        logger.debug(f'<<< Data received: {data}')
+
+        # Add to the buffer and look for lines
+        self.buffer += data
+        while (separator := self.buffer.find('\r')) >= 0:
+            line = self.buffer[:separator].strip()
+            self.buffer = self.buffer[separator + 1 :]
+            if len(line) > 0:
+                self.on_line(line)
+
+    def on_line(self, line: str) -> None:
+        self.lines.append(line)
+        self.lines_available.set()
+
+    def send_command_line(self, line: str) -> None:
+        logger.debug(color(f'>>> {line}', 'yellow'))
+        self.dlc.write(line + '\r')
+
+    def send_response_line(self, line: str) -> None:
+        logger.debug(color(f'>>> {line}', 'yellow'))
+        self.dlc.write('\r\n' + line + '\r\n')
+
+    async def next_line(self) -> str:
+        await self.lines_available.wait()
+        line = self.lines.popleft()
+        if not self.lines:
+            self.lines_available.clear()
+        logger.debug(color(f'<<< {line}', 'green'))
+        return line
+
 
 # -----------------------------------------------------------------------------
 # Normative protocol definitions
@@ -302,8 +370,12 @@ class HfProtocol:
 
     dlc: rfcomm.DLC
     command_lock: asyncio.Lock
-    response_queue: asyncio.Queue
-    unsolicited_queue: asyncio.Queue
+    if TYPE_CHECKING:
+        response_queue: asyncio.Queue[AtResponse]
+        unsolicited_queue: asyncio.Queue[AtResponse]
+    else:
+        response_queue: asyncio.Queue
+        unsolicited_queue: asyncio.Queue
     read_buffer: bytearray
 
     def __init__(self, dlc: rfcomm.DLC, configuration: Configuration):
@@ -368,7 +440,7 @@ class HfProtocol:
         else:
             logger.warning(f"dropping unexpected response with code '{response.code}'")
 
-    # Send an AT command and wait for the peer resposne.
+    # Send an AT command and wait for the peer response.
     # Wait for the AT responses sent by the peer, to the status code.
     # Raises asyncio.TimeoutError if the status is not received
     # after a timeout (default 1 second).
@@ -390,7 +462,7 @@ class HfProtocol:
                 )
                 if result.code == 'OK':
                     if response_type == AtResponseType.SINGLE and len(responses) != 1:
-                        raise ProtocolError("NO ANSWER")
+                        raise HfpProtocolError("NO ANSWER")
 
                     if response_type == AtResponseType.MULTIPLE:
                         return responses
@@ -398,7 +470,7 @@ class HfProtocol:
                         return responses[0]
                     return None
                 if result.code in STATUS_CODES:
-                    raise ProtocolError(result.code)
+                    raise HfpProtocolError(result.code)
                 responses.append(result)
 
     # 4.2.1 Service Level Connection Initialization.

bumble/host.py

@@ -21,7 +21,7 @@ import collections
 import logging
 import struct
 
-from typing import Optional
+from typing import Optional, TYPE_CHECKING, Dict, Callable, Awaitable
 
 from bumble.colors import color
 from bumble.l2cap import L2CAP_PDU
@@ -73,10 +73,14 @@ from .core import (
     BT_LE_TRANSPORT,
     ConnectionPHY,
     ConnectionParameters,
+    InvalidStateError,
 )
 from .utils import AbortableEventEmitter
 from .transport.common import TransportLostError
 
+if TYPE_CHECKING:
+    from .transport.common import TransportSink, TransportSource
+
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -116,10 +120,21 @@ class Connection:
 
 # -----------------------------------------------------------------------------
 class Host(AbortableEventEmitter):
-    def __init__(self, controller_source=None, controller_sink=None):
+    connections: Dict[int, Connection]
+    acl_packet_queue: collections.deque[HCI_AclDataPacket]
+    hci_sink: TransportSink
+    long_term_key_provider: Optional[
+        Callable[[int, bytes, int], Awaitable[Optional[bytes]]]
+    ]
+    link_key_provider: Optional[Callable[[Address], Awaitable[Optional[bytes]]]]
+
+    def __init__(
+        self,
+        controller_source: Optional[TransportSource] = None,
+        controller_sink: Optional[TransportSink] = None,
+    ) -> None:
         super().__init__()
 
-        self.hci_sink = None
         self.hci_metadata = None
         self.ready = False  # True when we can accept incoming packets
         self.reset_done = False
@@ -299,7 +314,7 @@ class Host(AbortableEventEmitter):
         self.reset_done = True
 
     @property
-    def controller(self):
+    def controller(self) -> TransportSink:
         return self.hci_sink
 
     @controller.setter
@@ -308,13 +323,12 @@ class Host(AbortableEventEmitter):
         if controller:
             controller.set_packet_sink(self)
 
-    def set_packet_sink(self, sink):
+    def set_packet_sink(self, sink: TransportSink) -> None:
         self.hci_sink = sink
 
     def send_hci_packet(self, packet: HCI_Packet) -> None:
         if self.snooper:
             self.snooper.snoop(bytes(packet), Snooper.Direction.HOST_TO_CONTROLLER)
-
         self.hci_sink.on_packet(bytes(packet))
 
     async def send_command(self, command, check_result=False):

bumble/l2cap.py

@@ -17,6 +17,7 @@
 # -----------------------------------------------------------------------------
 from __future__ import annotations
 import asyncio
+import enum
 import logging
 import struct
 
@@ -676,56 +677,35 @@ class L2CAP_LE_Flow_Control_Credit(L2CAP_Control_Frame):
 
 # -----------------------------------------------------------------------------
 class Channel(EventEmitter):
-    # States
-    CLOSED = 0x00
-    WAIT_CONNECT = 0x01
-    WAIT_CONNECT_RSP = 0x02
-    OPEN = 0x03
-    WAIT_DISCONNECT = 0x04
-    WAIT_CREATE = 0x05
-    WAIT_CREATE_RSP = 0x06
-    WAIT_MOVE = 0x07
-    WAIT_MOVE_RSP = 0x08
-    WAIT_MOVE_CONFIRM = 0x09
-    WAIT_CONFIRM_RSP = 0x0A
+    class State(enum.IntEnum):
+        # States
+        CLOSED = 0x00
+        WAIT_CONNECT = 0x01
+        WAIT_CONNECT_RSP = 0x02
+        OPEN = 0x03
+        WAIT_DISCONNECT = 0x04
+        WAIT_CREATE = 0x05
+        WAIT_CREATE_RSP = 0x06
+        WAIT_MOVE = 0x07
+        WAIT_MOVE_RSP = 0x08
+        WAIT_MOVE_CONFIRM = 0x09
+        WAIT_CONFIRM_RSP = 0x0A
 
-    # CONFIG substates
-    WAIT_CONFIG = 0x10
-    WAIT_SEND_CONFIG = 0x11
-    WAIT_CONFIG_REQ_RSP = 0x12
-    WAIT_CONFIG_RSP = 0x13
-    WAIT_CONFIG_REQ = 0x14
-    WAIT_IND_FINAL_RSP = 0x15
-    WAIT_FINAL_RSP = 0x16
-    WAIT_CONTROL_IND = 0x17
-
-    STATE_NAMES = {
-        CLOSED: 'CLOSED',
-        WAIT_CONNECT: 'WAIT_CONNECT',
-        WAIT_CONNECT_RSP: 'WAIT_CONNECT_RSP',
-        OPEN: 'OPEN',
-        WAIT_DISCONNECT: 'WAIT_DISCONNECT',
-        WAIT_CREATE: 'WAIT_CREATE',
-        WAIT_CREATE_RSP: 'WAIT_CREATE_RSP',
-        WAIT_MOVE: 'WAIT_MOVE',
-        WAIT_MOVE_RSP: 'WAIT_MOVE_RSP',
-        WAIT_MOVE_CONFIRM: 'WAIT_MOVE_CONFIRM',
-        WAIT_CONFIRM_RSP: 'WAIT_CONFIRM_RSP',
-        WAIT_CONFIG: 'WAIT_CONFIG',
-        WAIT_SEND_CONFIG: 'WAIT_SEND_CONFIG',
-        WAIT_CONFIG_REQ_RSP: 'WAIT_CONFIG_REQ_RSP',
-        WAIT_CONFIG_RSP: 'WAIT_CONFIG_RSP',
-        WAIT_CONFIG_REQ: 'WAIT_CONFIG_REQ',
-        WAIT_IND_FINAL_RSP: 'WAIT_IND_FINAL_RSP',
-        WAIT_FINAL_RSP: 'WAIT_FINAL_RSP',
-        WAIT_CONTROL_IND: 'WAIT_CONTROL_IND',
-    }
+        # CONFIG substates
+        WAIT_CONFIG = 0x10
+        WAIT_SEND_CONFIG = 0x11
+        WAIT_CONFIG_REQ_RSP = 0x12
+        WAIT_CONFIG_RSP = 0x13
+        WAIT_CONFIG_REQ = 0x14
+        WAIT_IND_FINAL_RSP = 0x15
+        WAIT_FINAL_RSP = 0x16
+        WAIT_CONTROL_IND = 0x17
 
     connection_result: Optional[asyncio.Future[None]]
     disconnection_result: Optional[asyncio.Future[None]]
     response: Optional[asyncio.Future[bytes]]
     sink: Optional[Callable[[bytes], Any]]
-    state: int
+    state: State
     connection: Connection
 
     def __init__(
@@ -741,7 +721,7 @@ class Channel(EventEmitter):
         self.manager = manager
         self.connection = connection
         self.signaling_cid = signaling_cid
-        self.state = Channel.CLOSED
+        self.state = self.State.CLOSED
         self.mtu = mtu
         self.psm = psm
         self.source_cid = source_cid
@@ -751,13 +731,11 @@ class Channel(EventEmitter):
         self.disconnection_result = None
         self.sink = None
 
-    def change_state(self, new_state: int) -> None:
-        logger.debug(
-            f'{self} state change -> {color(Channel.STATE_NAMES[new_state], "cyan")}'
-        )
+    def _change_state(self, new_state: State) -> None:
+        logger.debug(f'{self} state change -> {color(new_state.name, "cyan")}')
         self.state = new_state
 
-    def send_pdu(self, pdu: SupportsBytes | bytes) -> None:
+    def send_pdu(self, pdu: Union[SupportsBytes, bytes]) -> None:
         self.manager.send_pdu(self.connection, self.destination_cid, pdu)
 
     def send_control_frame(self, frame: L2CAP_Control_Frame) -> None:
@@ -767,7 +745,7 @@ class Channel(EventEmitter):
         # Check that there isn't already a request pending
         if self.response:
             raise InvalidStateError('request already pending')
-        if self.state != Channel.OPEN:
+        if self.state != self.State.OPEN:
             raise InvalidStateError('channel not open')
 
         self.response = asyncio.get_running_loop().create_future()
@@ -787,14 +765,14 @@ class Channel(EventEmitter):
             )
 
     async def connect(self) -> None:
-        if self.state != Channel.CLOSED:
+        if self.state != self.State.CLOSED:
             raise InvalidStateError('invalid state')
 
         # Check that we can start a new connection
         if self.connection_result:
             raise RuntimeError('connection already pending')
 
-        self.change_state(Channel.WAIT_CONNECT_RSP)
+        self._change_state(self.State.WAIT_CONNECT_RSP)
         self.send_control_frame(
             L2CAP_Connection_Request(
                 identifier=self.manager.next_identifier(self.connection),
@@ -814,10 +792,10 @@ class Channel(EventEmitter):
             self.connection_result = None
 
     async def disconnect(self) -> None:
-        if self.state != Channel.OPEN:
+        if self.state != self.State.OPEN:
             raise InvalidStateError('invalid state')
 
-        self.change_state(Channel.WAIT_DISCONNECT)
+        self._change_state(self.State.WAIT_DISCONNECT)
         self.send_control_frame(
             L2CAP_Disconnection_Request(
                 identifier=self.manager.next_identifier(self.connection),
@@ -832,8 +810,8 @@ class Channel(EventEmitter):
         return await self.disconnection_result
 
     def abort(self) -> None:
-        if self.state == self.OPEN:
-            self.change_state(self.CLOSED)
+        if self.state == self.State.OPEN:
+            self._change_state(self.State.CLOSED)
             self.emit('close')
 
     def send_configure_request(self) -> None:
@@ -856,7 +834,7 @@ class Channel(EventEmitter):
 
     def on_connection_request(self, request) -> None:
         self.destination_cid = request.source_cid
-        self.change_state(Channel.WAIT_CONNECT)
+        self._change_state(self.State.WAIT_CONNECT)
         self.send_control_frame(
             L2CAP_Connection_Response(
                 identifier=request.identifier,
@@ -866,24 +844,24 @@ class Channel(EventEmitter):
                 status=0x0000,
             )
         )
-        self.change_state(Channel.WAIT_CONFIG)
+        self._change_state(self.State.WAIT_CONFIG)
         self.send_configure_request()
-        self.change_state(Channel.WAIT_CONFIG_REQ_RSP)
+        self._change_state(self.State.WAIT_CONFIG_REQ_RSP)
 
     def on_connection_response(self, response):
-        if self.state != Channel.WAIT_CONNECT_RSP:
+        if self.state != self.State.WAIT_CONNECT_RSP:
             logger.warning(color('invalid state', 'red'))
             return
 
         if response.result == L2CAP_Connection_Response.CONNECTION_SUCCESSFUL:
             self.destination_cid = response.destination_cid
-            self.change_state(Channel.WAIT_CONFIG)
+            self._change_state(self.State.WAIT_CONFIG)
             self.send_configure_request()
-            self.change_state(Channel.WAIT_CONFIG_REQ_RSP)
+            self._change_state(self.State.WAIT_CONFIG_REQ_RSP)
         elif response.result == L2CAP_Connection_Response.CONNECTION_PENDING:
             pass
         else:
-            self.change_state(Channel.CLOSED)
+            self._change_state(self.State.CLOSED)
             self.connection_result.set_exception(
                 ProtocolError(
                     response.result,
@@ -895,9 +873,9 @@ class Channel(EventEmitter):
 
     def on_configure_request(self, request) -> None:
         if self.state not in (
-            Channel.WAIT_CONFIG,
-            Channel.WAIT_CONFIG_REQ,
-            Channel.WAIT_CONFIG_REQ_RSP,
+            self.State.WAIT_CONFIG,
+            self.State.WAIT_CONFIG_REQ,
+            self.State.WAIT_CONFIG_REQ_RSP,
         ):
             logger.warning(color('invalid state', 'red'))
             return
@@ -918,25 +896,28 @@ class Channel(EventEmitter):
                 options=request.options,  # TODO: don't accept everything blindly
             )
         )
-        if self.state == Channel.WAIT_CONFIG:
-            self.change_state(Channel.WAIT_SEND_CONFIG)
+        if self.state == self.State.WAIT_CONFIG:
+            self._change_state(self.State.WAIT_SEND_CONFIG)
             self.send_configure_request()
-            self.change_state(Channel.WAIT_CONFIG_RSP)
-        elif self.state == Channel.WAIT_CONFIG_REQ:
-            self.change_state(Channel.OPEN)
+            self._change_state(self.State.WAIT_CONFIG_RSP)
+        elif self.state == self.State.WAIT_CONFIG_REQ:
+            self._change_state(self.State.OPEN)
             if self.connection_result:
                 self.connection_result.set_result(None)
                 self.connection_result = None
             self.emit('open')
-        elif self.state == Channel.WAIT_CONFIG_REQ_RSP:
-            self.change_state(Channel.WAIT_CONFIG_RSP)
+        elif self.state == self.State.WAIT_CONFIG_REQ_RSP:
+            self._change_state(self.State.WAIT_CONFIG_RSP)
 
     def on_configure_response(self, response) -> None:
         if response.result == L2CAP_Configure_Response.SUCCESS:
-            if self.state == Channel.WAIT_CONFIG_REQ_RSP:
-                self.change_state(Channel.WAIT_CONFIG_REQ)
-            elif self.state in (Channel.WAIT_CONFIG_RSP, Channel.WAIT_CONTROL_IND):
-                self.change_state(Channel.OPEN)
+            if self.state == self.State.WAIT_CONFIG_REQ_RSP:
+                self._change_state(self.State.WAIT_CONFIG_REQ)
+            elif self.state in (
+                self.State.WAIT_CONFIG_RSP,
+                self.State.WAIT_CONTROL_IND,
+            ):
+                self._change_state(self.State.OPEN)
                 if self.connection_result:
                     self.connection_result.set_result(None)
                     self.connection_result = None
@@ -966,7 +947,7 @@ class Channel(EventEmitter):
             # TODO: decide how to fail gracefully
 
     def on_disconnection_request(self, request) -> None:
-        if self.state in (Channel.OPEN, Channel.WAIT_DISCONNECT):
+        if self.state in (self.State.OPEN, self.State.WAIT_DISCONNECT):
             self.send_control_frame(
                 L2CAP_Disconnection_Response(
                     identifier=request.identifier,
@@ -974,14 +955,14 @@ class Channel(EventEmitter):
                     source_cid=request.source_cid,
                 )
             )
-            self.change_state(Channel.CLOSED)
+            self._change_state(self.State.CLOSED)
             self.emit('close')
             self.manager.on_channel_closed(self)
         else:
             logger.warning(color('invalid state', 'red'))
 
     def on_disconnection_response(self, response) -> None:
-        if self.state != Channel.WAIT_DISCONNECT:
+        if self.state != self.State.WAIT_DISCONNECT:
             logger.warning(color('invalid state', 'red'))
             return
 
@@ -992,7 +973,7 @@ class Channel(EventEmitter):
             logger.warning('unexpected source or destination CID')
             return
 
-        self.change_state(Channel.CLOSED)
+        self._change_state(self.State.CLOSED)
         if self.disconnection_result:
             self.disconnection_result.set_result(None)
             self.disconnection_result = None
@@ -1004,7 +985,7 @@ class Channel(EventEmitter):
             f'Channel({self.source_cid}->{self.destination_cid}, '
             f'PSM={self.psm}, '
             f'MTU={self.mtu}, '
-            f'state={Channel.STATE_NAMES[self.state]})'
+            f'state={self.state.name})'
         )
 
 
@@ -1014,33 +995,21 @@ class LeConnectionOrientedChannel(EventEmitter):
     LE Credit-based Connection Oriented Channel
     """
 
-    INIT = 0
-    CONNECTED = 1
-    CONNECTING = 2
-    DISCONNECTING = 3
-    DISCONNECTED = 4
-    CONNECTION_ERROR = 5
-
-    STATE_NAMES = {
-        INIT: 'INIT',
-        CONNECTED: 'CONNECTED',
-        CONNECTING: 'CONNECTING',
-        DISCONNECTING: 'DISCONNECTING',
-        DISCONNECTED: 'DISCONNECTED',
-        CONNECTION_ERROR: 'CONNECTION_ERROR',
-    }
+    class State(enum.IntEnum):
+        INIT = 0
+        CONNECTED = 1
+        CONNECTING = 2
+        DISCONNECTING = 3
+        DISCONNECTED = 4
+        CONNECTION_ERROR = 5
 
     out_queue: Deque[bytes]
     connection_result: Optional[asyncio.Future[LeConnectionOrientedChannel]]
     disconnection_result: Optional[asyncio.Future[None]]
     out_sdu: Optional[bytes]
-    state: int
+    state: State
     connection: Connection
 
-    @staticmethod
-    def state_name(state: int) -> str:
-        return name_or_number(LeConnectionOrientedChannel.STATE_NAMES, state)
-
     def __init__(
         self,
         manager: ChannelManager,
@@ -1083,22 +1052,20 @@ class LeConnectionOrientedChannel(EventEmitter):
         self.drained.set()
 
         if connected:
-            self.state = LeConnectionOrientedChannel.CONNECTED
+            self.state = self.State.CONNECTED
         else:
-            self.state = LeConnectionOrientedChannel.INIT
+            self.state = self.State.INIT
 
-    def change_state(self, new_state: int) -> None:
-        logger.debug(
-            f'{self} state change -> {color(self.state_name(new_state), "cyan")}'
-        )
+    def _change_state(self, new_state: State) -> None:
+        logger.debug(f'{self} state change -> {color(new_state.name, "cyan")}')
         self.state = new_state
 
-        if new_state == self.CONNECTED:
+        if new_state == self.State.CONNECTED:
             self.emit('open')
-        elif new_state == self.DISCONNECTED:
+        elif new_state == self.State.DISCONNECTED:
             self.emit('close')
 
-    def send_pdu(self, pdu: SupportsBytes | bytes) -> None:
+    def send_pdu(self, pdu: Union[SupportsBytes, bytes]) -> None:
         self.manager.send_pdu(self.connection, self.destination_cid, pdu)
 
     def send_control_frame(self, frame: L2CAP_Control_Frame) -> None:
@@ -1106,7 +1073,7 @@ class LeConnectionOrientedChannel(EventEmitter):
 
     async def connect(self) -> LeConnectionOrientedChannel:
         # Check that we're in the right state
-        if self.state != self.INIT:
+        if self.state != self.State.INIT:
             raise InvalidStateError('not in a connectable state')
 
         # Check that we can start a new connection
@@ -1114,7 +1081,7 @@ class LeConnectionOrientedChannel(EventEmitter):
         if identifier in self.manager.le_coc_requests:
             raise RuntimeError('too many concurrent connection requests')
 
-        self.change_state(self.CONNECTING)
+        self._change_state(self.State.CONNECTING)
         request = L2CAP_LE_Credit_Based_Connection_Request(
             identifier=identifier,
             le_psm=self.le_psm,
@@ -1134,10 +1101,10 @@ class LeConnectionOrientedChannel(EventEmitter):
 
     async def disconnect(self) -> None:
         # Check that we're connected
-        if self.state != self.CONNECTED:
+        if self.state != self.State.CONNECTED:
             raise InvalidStateError('not connected')
 
-        self.change_state(self.DISCONNECTING)
+        self._change_state(self.State.DISCONNECTING)
         self.flush_output()
         self.send_control_frame(
             L2CAP_Disconnection_Request(
@@ -1153,15 +1120,15 @@ class LeConnectionOrientedChannel(EventEmitter):
         return await self.disconnection_result
 
     def abort(self) -> None:
-        if self.state == self.CONNECTED:
-            self.change_state(self.DISCONNECTED)
+        if self.state == self.State.CONNECTED:
+            self._change_state(self.State.DISCONNECTED)
 
     def on_pdu(self, pdu: bytes) -> None:
         if self.sink is None:
             logger.warning('received pdu without a sink')
             return
 
-        if self.state != self.CONNECTED:
+        if self.state != self.State.CONNECTED:
             logger.warning('received PDU while not connected, dropping')
 
         # Manage the peer credits
@@ -1240,7 +1207,7 @@ class LeConnectionOrientedChannel(EventEmitter):
             self.credits = response.initial_credits
             self.connected = True
             self.connection_result.set_result(self)
-            self.change_state(self.CONNECTED)
+            self._change_state(self.State.CONNECTED)
         else:
             self.connection_result.set_exception(
                 ProtocolError(
@@ -1251,7 +1218,7 @@ class LeConnectionOrientedChannel(EventEmitter):
                     ),
                 )
             )
-            self.change_state(self.CONNECTION_ERROR)
+            self._change_state(self.State.CONNECTION_ERROR)
 
         # Cleanup
         self.connection_result = None
@@ -1271,11 +1238,11 @@ class LeConnectionOrientedChannel(EventEmitter):
                 source_cid=request.source_cid,
             )
         )
-        self.change_state(self.DISCONNECTED)
+        self._change_state(self.State.DISCONNECTED)
         self.flush_output()
 
     def on_disconnection_response(self, response) -> None:
-        if self.state != self.DISCONNECTING:
+        if self.state != self.State.DISCONNECTING:
             logger.warning(color('invalid state', 'red'))
             return
 
@@ -1286,7 +1253,7 @@ class LeConnectionOrientedChannel(EventEmitter):
             logger.warning('unexpected source or destination CID')
             return
 
-        self.change_state(self.DISCONNECTED)
+        self._change_state(self.State.DISCONNECTED)
         if self.disconnection_result:
             self.disconnection_result.set_result(None)
             self.disconnection_result = None
@@ -1339,7 +1306,7 @@ class LeConnectionOrientedChannel(EventEmitter):
                 return
 
     def write(self, data: bytes) -> None:
-        if self.state != self.CONNECTED:
+        if self.state != self.State.CONNECTED:
             logger.warning('not connected, dropping data')
             return
 
@@ -1367,7 +1334,7 @@ class LeConnectionOrientedChannel(EventEmitter):
     def __str__(self) -> str:
         return (
             f'CoC({self.source_cid}->{self.destination_cid}, '
-            f'State={self.state_name(self.state)}, '
+            f'State={self.state.name}, '
             f'PSM={self.le_psm}, '
             f'MTU={self.mtu}/{self.peer_mtu}, '
             f'MPS={self.mps}/{self.peer_mps}, '
@@ -1387,6 +1354,7 @@ class ChannelManager:
     le_coc_requests: Dict[int, L2CAP_LE_Credit_Based_Connection_Request]
     fixed_channels: Dict[int, Optional[Callable[[int, bytes], Any]]]
     _host: Optional[Host]
+    connection_parameters_update_response: Optional[asyncio.Future[int]]
 
     def __init__(
         self,
@@ -1408,6 +1376,7 @@ class ChannelManager:
         self.le_coc_requests = {}  # LE CoC connection requests, by identifier
         self.extended_features = extended_features
         self.connectionless_mtu = connectionless_mtu
+        self.connection_parameters_update_response = None
 
     @property
     def host(self) -> Host:
@@ -1569,7 +1538,7 @@ class ChannelManager:
         if connection_handle in self.identifiers:
             del self.identifiers[connection_handle]
 
-    def send_pdu(self, connection, cid: int, pdu: SupportsBytes | bytes) -> None:
+    def send_pdu(self, connection, cid: int, pdu: Union[SupportsBytes, bytes]) -> None:
         pdu_str = pdu.hex() if isinstance(pdu, bytes) else str(pdu)
         logger.debug(
             f'{color(">>> Sending L2CAP PDU", "blue")} '
@@ -1865,11 +1834,45 @@ class ChannelManager:
                 ),
             )
 
+    async def update_connection_parameters(
+        self,
+        connection: Connection,
+        interval_min: int,
+        interval_max: int,
+        latency: int,
+        timeout: int,
+    ) -> int:
+        # Check that there isn't already a request pending
+        if self.connection_parameters_update_response:
+            raise InvalidStateError('request already pending')
+        self.connection_parameters_update_response = (
+            asyncio.get_running_loop().create_future()
+        )
+        self.send_control_frame(
+            connection,
+            L2CAP_LE_SIGNALING_CID,
+            L2CAP_Connection_Parameter_Update_Request(
+                interval_min=interval_min,
+                interval_max=interval_max,
+                latency=latency,
+                timeout=timeout,
+            ),
+        )
+        return await self.connection_parameters_update_response
+
     def on_l2cap_connection_parameter_update_response(
         self, connection: Connection, cid: int, response
     ) -> None:
-        # TODO: check response
-        pass
+        if self.connection_parameters_update_response:
+            self.connection_parameters_update_response.set_result(response.result)
+            self.connection_parameters_update_response = None
+        else:
+            logger.warning(
+                color(
+                    'received l2cap_connection_parameter_update_response without a pending request',
+                    'red',
+                )
+            )
 
     def on_l2cap_le_credit_based_connection_request(
         self, connection: Connection, cid: int, request
@@ -2078,7 +2081,8 @@ class ChannelManager:
         # Connect
         try:
             await channel.connect()
-        except Exception:
+        except Exception as e:
             del connection_channels[source_cid]
+            raise e
 
         return channel

bumble/pandora/security.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import asyncio
+import contextlib
 import grpc
 import logging
 
@@ -27,8 +28,8 @@ from bumble.core import (
 )
 from bumble.device import Connection as BumbleConnection, Device
 from bumble.hci import HCI_Error
+from bumble.utils import EventWatcher
 from bumble.pairing import PairingConfig, PairingDelegate as BasePairingDelegate
-from contextlib import suppress
 from google.protobuf import any_pb2  # pytype: disable=pyi-error
 from google.protobuf import empty_pb2  # pytype: disable=pyi-error
 from google.protobuf import wrappers_pb2  # pytype: disable=pyi-error
@@ -232,7 +233,11 @@ class SecurityService(SecurityServicer):
                 sc=config.pairing_sc_enable,
                 mitm=config.pairing_mitm_enable,
                 bonding=config.pairing_bonding_enable,
-                identity_address_type=config.identity_address_type,
+                identity_address_type=(
+                    PairingConfig.AddressType.PUBLIC
+                    if connection.self_address.is_public
+                    else config.identity_address_type
+                ),
                 delegate=PairingDelegate(
                     connection,
                     self,
@@ -294,23 +299,35 @@ class SecurityService(SecurityServicer):
             try:
                 self.log.debug('Pair...')
 
-                if (
-                    connection.transport == BT_LE_TRANSPORT
-                    and connection.role == BT_PERIPHERAL_ROLE
-                ):
-                    wait_for_security: asyncio.Future[
-                        bool
-                    ] = asyncio.get_running_loop().create_future()
-                    connection.on("pairing", lambda *_: wait_for_security.set_result(True))  # type: ignore
-                    connection.on("pairing_failure", wait_for_security.set_exception)
+                security_result = asyncio.get_running_loop().create_future()
 
-                    connection.request_pairing()
+                with contextlib.closing(EventWatcher()) as watcher:
 
-                    await wait_for_security
-                else:
-                    await connection.pair()
+                    @watcher.on(connection, 'pairing')
+                    def on_pairing(*_: Any) -> None:
+                        security_result.set_result('success')
 
-                self.log.debug('Paired')
+                    @watcher.on(connection, 'pairing_failure')
+                    def on_pairing_failure(*_: Any) -> None:
+                        security_result.set_result('pairing_failure')
+
+                    @watcher.on(connection, 'disconnection')
+                    def on_disconnection(*_: Any) -> None:
+                        security_result.set_result('connection_died')
+
+                    if (
+                        connection.transport == BT_LE_TRANSPORT
+                        and connection.role == BT_PERIPHERAL_ROLE
+                    ):
+                        connection.request_pairing()
+                    else:
+                        await connection.pair()
+
+                    result = await security_result
+
+                self.log.debug(f'Pairing session complete, status={result}')
+                if result != 'success':
+                    return SecureResponse(**{result: empty_pb2.Empty()})
             except asyncio.CancelledError:
                 self.log.warning("Connection died during encryption")
                 return SecureResponse(connection_died=empty_pb2.Empty())
@@ -369,6 +386,7 @@ class SecurityService(SecurityServicer):
             str
         ] = asyncio.get_running_loop().create_future()
         authenticate_task: Optional[asyncio.Future[None]] = None
+        pair_task: Optional[asyncio.Future[None]] = None
 
         async def authenticate() -> None:
             assert connection
@@ -415,6 +433,10 @@ class SecurityService(SecurityServicer):
                 if authenticate_task is None:
                     authenticate_task = asyncio.create_task(authenticate())
 
+        def pair(*_: Any) -> None:
+            if self.need_pairing(connection, level):
+                pair_task = asyncio.create_task(connection.pair())
+
         listeners: Dict[str, Callable[..., None]] = {
             'disconnection': set_failure('connection_died'),
             'pairing_failure': set_failure('pairing_failure'),
@@ -425,6 +447,7 @@ class SecurityService(SecurityServicer):
             'connection_encryption_change': on_encryption_change,
             'classic_pairing': try_set_success,
             'classic_pairing_failure': set_failure('pairing_failure'),
+            'security_request': pair,
         }
 
         # register event handlers
@@ -452,6 +475,15 @@ class SecurityService(SecurityServicer):
                 pass
             self.log.debug('Authenticated')
 
+        # wait for `pair` to finish if any
+        if pair_task is not None:
+            self.log.debug('Wait for authentication...')
+            try:
+                await pair_task  # type: ignore
+            except:
+                pass
+            self.log.debug('paired')
+
         return WaitSecurityResponse(**kwargs)
 
     def reached_security_level(
@@ -523,7 +555,7 @@ class SecurityStorageService(SecurityStorageServicer):
         self.log.debug(f"DeleteBond: {address}")
 
         if self.device.keystore is not None:
-            with suppress(KeyError):
+            with contextlib.suppress(KeyError):
                 await self.device.keystore.delete(str(address))
 
         return empty_pb2.Empty()

bumble/rfcomm.py

@@ -20,13 +20,29 @@ from __future__ import annotations
 import logging
 import asyncio
 import enum
+from typing import Callable, Dict, List, Optional, Tuple, Union, TYPE_CHECKING
 
 from pyee import EventEmitter
-from typing import Optional, Tuple, Callable, Dict, Union, TYPE_CHECKING
 
 from . import core, l2cap
 from .colors import color
-from .core import BT_BR_EDR_TRANSPORT, InvalidStateError, ProtocolError
+from .core import (
+    UUID,
+    BT_RFCOMM_PROTOCOL_ID,
+    BT_BR_EDR_TRANSPORT,
+    BT_L2CAP_PROTOCOL_ID,
+    InvalidStateError,
+    ProtocolError,
+)
+from .sdp import (
+    SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
+    SDP_BROWSE_GROUP_LIST_ATTRIBUTE_ID,
+    SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID,
+    SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+    SDP_PUBLIC_BROWSE_ROOT,
+    DataElement,
+    ServiceAttribute,
+)
 
 if TYPE_CHECKING:
     from bumble.device import Device, Connection
@@ -111,6 +127,50 @@ RFCOMM_DYNAMIC_CHANNEL_NUMBER_END   = 30
 # fmt: on
 
 
+# -----------------------------------------------------------------------------
+def make_service_sdp_records(
+    service_record_handle: int, channel: int, uuid: Optional[UUID] = None
+) -> List[ServiceAttribute]:
+    """
+    Create SDP records for an RFComm service given a channel number and an
+    optional UUID. A Service Class Attribute is included only if the UUID is not None.
+    """
+    records = [
+        ServiceAttribute(
+            SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
+            DataElement.unsigned_integer_32(service_record_handle),
+        ),
+        ServiceAttribute(
+            SDP_BROWSE_GROUP_LIST_ATTRIBUTE_ID,
+            DataElement.sequence([DataElement.uuid(SDP_PUBLIC_BROWSE_ROOT)]),
+        ),
+        ServiceAttribute(
+            SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+            DataElement.sequence(
+                [
+                    DataElement.sequence([DataElement.uuid(BT_L2CAP_PROTOCOL_ID)]),
+                    DataElement.sequence(
+                        [
+                            DataElement.uuid(BT_RFCOMM_PROTOCOL_ID),
+                            DataElement.unsigned_integer_8(channel),
+                        ]
+                    ),
+                ]
+            ),
+        ),
+    ]
+
+    if uuid:
+        records.append(
+            ServiceAttribute(
+                SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID,
+                DataElement.sequence([DataElement.uuid(uuid)]),
+            )
+        )
+
+    return records
+
+
 # -----------------------------------------------------------------------------
 def compute_fcs(buffer: bytes) -> int:
     result = 0xFF

bumble/smp.py

@@ -37,6 +37,7 @@ from typing import (
     Optional,
     Tuple,
     Type,
+    cast,
 )
 
 from pyee import EventEmitter
@@ -1771,7 +1772,26 @@ class Manager(EventEmitter):
         cid = SMP_BR_CID if connection.transport == BT_BR_EDR_TRANSPORT else SMP_CID
         connection.send_l2cap_pdu(cid, command.to_bytes())
 
+    def on_smp_security_request_command(
+        self, connection: Connection, request: SMP_Security_Request_Command
+    ) -> None:
+        connection.emit('security_request', request.auth_req)
+
     def on_smp_pdu(self, connection: Connection, pdu: bytes) -> None:
+        # Parse the L2CAP payload into an SMP Command object
+        command = SMP_Command.from_bytes(pdu)
+        logger.debug(
+            f'<<< Received SMP Command on connection [0x{connection.handle:04X}] '
+            f'{connection.peer_address}: {command}'
+        )
+
+        # Security request is more than just pairing, so let applications handle them
+        if command.code == SMP_SECURITY_REQUEST_COMMAND:
+            self.on_smp_security_request_command(
+                connection, cast(SMP_Security_Request_Command, command)
+            )
+            return
+
         # Look for a session with this connection, and create one if none exists
         if not (session := self.sessions.get(connection.handle)):
             if connection.role == BT_CENTRAL_ROLE:
@@ -1782,13 +1802,6 @@ class Manager(EventEmitter):
             )
             self.sessions[connection.handle] = session
 
-        # Parse the L2CAP payload into an SMP Command object
-        command = SMP_Command.from_bytes(pdu)
-        logger.debug(
-            f'<<< Received SMP Command on connection [0x{connection.handle:04X}] '
-            f'{connection.peer_address}: {command}'
-        )
-
         # Delegate the handling of the command to the session
         session.on_smp_command(command)
 

bumble/transport/__init__.py

@@ -20,7 +20,6 @@ import logging
 import os
 
 from .common import Transport, AsyncPipeSink, SnoopingTransport
-from ..controller import Controller
 from ..snoop import create_snooper
 
 # -----------------------------------------------------------------------------
@@ -119,7 +118,8 @@ async def _open_transport(name: str) -> Transport:
     if scheme == 'file':
         from .file import open_file_transport
 
-        return await open_file_transport(spec[0] if spec else None)
+        assert spec is not None
+        return await open_file_transport(spec[0])
 
     if scheme == 'vhci':
         from .vhci import open_vhci_transport
@@ -134,12 +134,14 @@ async def _open_transport(name: str) -> Transport:
     if scheme == 'usb':
         from .usb import open_usb_transport
 
-        return await open_usb_transport(spec[0] if spec else None)
+        assert spec is not None
+        return await open_usb_transport(spec[0])
 
     if scheme == 'pyusb':
         from .pyusb import open_pyusb_transport
 
-        return await open_pyusb_transport(spec[0] if spec else None)
+        assert spec is not None
+        return await open_pyusb_transport(spec[0])
 
     if scheme == 'android-emulator':
         from .android_emulator import open_android_emulator_transport
@@ -168,6 +170,7 @@ async def open_transport_or_link(name: str) -> Transport:
 
     """
     if name.startswith('link-relay:'):
+        from ..controller import Controller
         from ..link import RemoteLink  # lazy import
 
         link = RemoteLink(name[11:])

bumble/transport/android_emulator.py

@@ -18,7 +18,9 @@
 import logging
 import grpc.aio
 
-from .common import PumpedTransport, PumpedPacketSource, PumpedPacketSink
+from typing import Optional, Union
+
+from .common import PumpedTransport, PumpedPacketSource, PumpedPacketSink, Transport
 
 # pylint: disable=no-name-in-module
 from .grpc_protobuf.emulated_bluetooth_pb2_grpc import EmulatedBluetoothServiceStub
@@ -33,7 +35,7 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
-async def open_android_emulator_transport(spec):
+async def open_android_emulator_transport(spec: Optional[str]) -> Transport:
     '''
     Open a transport connection to an Android emulator via its gRPC interface.
     The parameter string has this syntax:
@@ -66,7 +68,7 @@ async def open_android_emulator_transport(spec):
     # Parse the parameters
     mode = 'host'
     server_host = 'localhost'
-    server_port = 8554
+    server_port = '8554'
     if spec is not None:
         params = spec.split(',')
         for param in params:
@@ -82,6 +84,7 @@ async def open_android_emulator_transport(spec):
     logger.debug(f'connecting to gRPC server at {server_address}')
     channel = grpc.aio.insecure_channel(server_address)
 
+    service: Union[EmulatedBluetoothServiceStub, VhciForwardingServiceStub]
     if mode == 'host':
         # Connect as a host
         service = EmulatedBluetoothServiceStub(channel)
@@ -94,10 +97,13 @@ async def open_android_emulator_transport(spec):
         raise ValueError('invalid mode')
 
     # Create the transport object
-    transport = PumpedTransport(
-        PumpedPacketSource(hci_device.read),
-        PumpedPacketSink(hci_device.write),
-        channel.close,
+    class EmulatorTransport(PumpedTransport):
+        async def close(self):
+            await super().close()
+            await channel.close()
+
+    transport = EmulatorTransport(
+        PumpedPacketSource(hci_device.read), PumpedPacketSink(hci_device.write)
     )
     transport.start()
 

bumble/transport/android_netsim.py

@@ -18,11 +18,12 @@
 import asyncio
 import atexit
 import logging
-import grpc.aio
 import os
 import pathlib
 import sys
-from typing import Optional
+from typing import Dict, Optional
+
+import grpc.aio
 
 from .common import (
     ParserSource,
@@ -33,8 +34,8 @@ from .common import (
 )
 
 # pylint: disable=no-name-in-module
-from .grpc_protobuf.packet_streamer_pb2_grpc import PacketStreamerStub
 from .grpc_protobuf.packet_streamer_pb2_grpc import (
+    PacketStreamerStub,
     PacketStreamerServicer,
     add_PacketStreamerServicer_to_server,
 )
@@ -43,6 +44,7 @@ from .grpc_protobuf.hci_packet_pb2 import HCIPacket
 from .grpc_protobuf.startup_pb2 import Chip, ChipInfo
 from .grpc_protobuf.common_pb2 import ChipKind
 
+
 # -----------------------------------------------------------------------------
 # Logging
 # -----------------------------------------------------------------------------
@@ -74,14 +76,20 @@ def get_ini_dir() -> Optional[pathlib.Path]:
 
 
 # -----------------------------------------------------------------------------
-def find_grpc_port() -> int:
+def ini_file_name(instance_number: int) -> str:
+    suffix = f'_{instance_number}' if instance_number > 0 else ''
+    return f'netsim{suffix}.ini'
+
+
+# -----------------------------------------------------------------------------
+def find_grpc_port(instance_number: int) -> int:
     if not (ini_dir := get_ini_dir()):
         logger.debug('no known directory for .ini file')
         return 0
 
-    ini_file = ini_dir / 'netsim.ini'
+    ini_file = ini_dir / ini_file_name(instance_number)
+    logger.debug(f'Looking for .ini file at {ini_file}')
     if ini_file.is_file():
-        logger.debug(f'Found .ini file at {ini_file}')
         with open(ini_file, 'r') as ini_file_data:
             for line in ini_file_data.readlines():
                 if '=' in line:
@@ -90,12 +98,14 @@ def find_grpc_port() -> int:
                         logger.debug(f'gRPC port = {value}')
                         return int(value)
 
+        logger.debug('no grpc.port property found in .ini file')
+
     # Not found
     return 0
 
 
 # -----------------------------------------------------------------------------
-def publish_grpc_port(grpc_port) -> bool:
+def publish_grpc_port(grpc_port: int, instance_number: int) -> bool:
     if not (ini_dir := get_ini_dir()):
         logger.debug('no known directory for .ini file')
         return False
@@ -104,7 +114,7 @@ def publish_grpc_port(grpc_port) -> bool:
         logger.debug('ini directory does not exist')
         return False
 
-    ini_file = ini_dir / 'netsim.ini'
+    ini_file = ini_dir / ini_file_name(instance_number)
     try:
         ini_file.write_text(f'grpc.port={grpc_port}\n')
         logger.debug(f"published gRPC port at {ini_file}")
@@ -121,13 +131,16 @@ def publish_grpc_port(grpc_port) -> bool:
 
 
 # -----------------------------------------------------------------------------
-async def open_android_netsim_controller_transport(server_host, server_port):
+async def open_android_netsim_controller_transport(
+    server_host: Optional[str], server_port: int, options: Dict[str, str]
+) -> Transport:
     if not server_port:
         raise ValueError('invalid port')
     if server_host == '_' or not server_host:
         server_host = 'localhost'
 
-    if not publish_grpc_port(server_port):
+    instance_number = int(options.get('instance', "0"))
+    if not publish_grpc_port(server_port, instance_number):
         logger.warning("unable to publish gRPC port")
 
     class HciDevice:
@@ -184,15 +197,12 @@ async def open_android_netsim_controller_transport(server_host, server_port):
                 logger.debug(f'<<< PACKET: {data.hex()}')
                 self.on_data_received(data)
 
-        def send_packet(self, data):
-            async def send():
-                await self.context.write(
-                    PacketResponse(
-                        hci_packet=HCIPacket(packet_type=data[0], packet=data[1:])
-                    )
+        async def send_packet(self, data):
+            return await self.context.write(
+                PacketResponse(
+                    hci_packet=HCIPacket(packet_type=data[0], packet=data[1:])
                 )
-
-            self.loop.create_task(send())
+            )
 
         def terminate(self):
             self.task.cancel()
@@ -226,17 +236,17 @@ async def open_android_netsim_controller_transport(server_host, server_port):
                 logger.debug('gRPC server cancelled')
                 await self.grpc_server.stop(None)
 
-        def on_packet(self, packet):
+        async def send_packet(self, packet):
             if not self.device:
                 logger.debug('no device, dropping packet')
                 return
 
-            self.device.send_packet(packet)
+            return await self.device.send_packet(packet)
 
         async def StreamPackets(self, _request_iterator, context):
             logger.debug('StreamPackets request')
 
-            # Check that we won't already have a device
+            # Check that we don't already have a device
             if self.device:
                 logger.debug('busy, already serving a device')
                 return PacketResponse(error='Busy')
@@ -259,15 +269,42 @@ async def open_android_netsim_controller_transport(server_host, server_port):
     await server.start()
     asyncio.get_running_loop().create_task(server.serve())
 
-    class GrpcServerTransport(Transport):
-        async def close(self):
-            await super().close()
-
-    return GrpcServerTransport(server, server)
+    sink = PumpedPacketSink(server.send_packet)
+    sink.start()
+    return Transport(server, sink)
 
 
 # -----------------------------------------------------------------------------
-async def open_android_netsim_host_transport(server_host, server_port, options):
+async def open_android_netsim_host_transport_with_address(
+    server_host: Optional[str],
+    server_port: int,
+    options: Optional[Dict[str, str]] = None,
+):
+    if server_host == '_' or not server_host:
+        server_host = 'localhost'
+
+    if not server_port:
+        # Look for the gRPC config in a .ini file
+        instance_number = 0 if options is None else int(options.get('instance', '0'))
+        server_port = find_grpc_port(instance_number)
+        if not server_port:
+            raise RuntimeError('gRPC server port not found')
+
+    # Connect to the gRPC server
+    server_address = f'{server_host}:{server_port}'
+    logger.debug(f'Connecting to gRPC server at {server_address}')
+    channel = grpc.aio.insecure_channel(server_address)
+
+    return await open_android_netsim_host_transport_with_channel(
+        channel,
+        options,
+    )
+
+
+# -----------------------------------------------------------------------------
+async def open_android_netsim_host_transport_with_channel(
+    channel, options: Optional[Dict[str, str]] = None
+):
     # Wrapper for I/O operations
     class HciDevice:
         def __init__(self, name, manufacturer, hci_device):
@@ -286,10 +323,12 @@ async def open_android_netsim_host_transport(server_host, server_port, options):
         async def read(self):
             response = await self.hci_device.read()
             response_type = response.WhichOneof('response_type')
+
             if response_type == 'error':
                 logger.warning(f'received error: {response.error}')
                 raise RuntimeError(response.error)
-            elif response_type == 'hci_packet':
+
+            if response_type == 'hci_packet':
                 return (
                     bytes([response.hci_packet.packet_type])
                     + response.hci_packet.packet
@@ -304,24 +343,9 @@ async def open_android_netsim_host_transport(server_host, server_port, options):
                 )
             )
 
-    name = options.get('name', DEFAULT_NAME)
+    name = DEFAULT_NAME if options is None else options.get('name', DEFAULT_NAME)
     manufacturer = DEFAULT_MANUFACTURER
 
-    if server_host == '_' or not server_host:
-        server_host = 'localhost'
-
-    if not server_port:
-        # Look for the gRPC config in a .ini file
-        server_host = 'localhost'
-        server_port = find_grpc_port()
-        if not server_port:
-            raise RuntimeError('gRPC server port not found')
-
-    # Connect to the gRPC server
-    server_address = f'{server_host}:{server_port}'
-    logger.debug(f'Connecting to gRPC server at {server_address}')
-    channel = grpc.aio.insecure_channel(server_address)
-
     # Connect as a host
     service = PacketStreamerStub(channel)
     hci_device = HciDevice(
@@ -332,10 +356,14 @@ async def open_android_netsim_host_transport(server_host, server_port, options):
     await hci_device.start()
 
     # Create the transport object
-    transport = PumpedTransport(
+    class GrpcTransport(PumpedTransport):
+        async def close(self):
+            await super().close()
+            await channel.close()
+
+    transport = GrpcTransport(
         PumpedPacketSource(hci_device.read),
         PumpedPacketSink(hci_device.write),
-        channel.close,
     )
     transport.start()
 
@@ -343,7 +371,7 @@ async def open_android_netsim_host_transport(server_host, server_port, options):
 
 
 # -----------------------------------------------------------------------------
-async def open_android_netsim_transport(spec):
+async def open_android_netsim_transport(spec: Optional[str]) -> Transport:
     '''
     Open a transport connection as a client or server, implementing Android's `netsim`
     simulator protocol over gRPC.
@@ -357,6 +385,11 @@ async def open_android_netsim_transport(spec):
         to connect *to* a netsim server (netsim is the controller), or accept
         connections *as* a netsim-compatible server.
 
+      instance=<n>
+        Specifies an instance number, with <n> > 0. This is used to determine which
+        .init file to use. In `host` mode, it is ignored when the <host>:<port>
+        specifier is present, since in that case no .ini file is used.
+
     In `host` mode:
       The <host>:<port> part is optional. When not specified, the transport
       looks for a netsim .ini file, from which it will read the `grpc.backend.port`
@@ -385,14 +418,15 @@ async def open_android_netsim_transport(spec):
     params = spec.split(',') if spec else []
     if params and ':' in params[0]:
         # Explicit <host>:<port>
-        host, port = params[0].split(':')
+        host, port_str = params[0].split(':')
+        port = int(port_str)
         params_offset = 1
     else:
         host = None
         port = 0
         params_offset = 0
 
-    options = {}
+    options: Dict[str, str] = {}
     for param in params[params_offset:]:
         if '=' not in param:
             raise ValueError('invalid parameter, expected <name>=<value>')
@@ -401,10 +435,12 @@ async def open_android_netsim_transport(spec):
 
     mode = options.get('mode', 'host')
     if mode == 'host':
-        return await open_android_netsim_host_transport(host, port, options)
+        return await open_android_netsim_host_transport_with_address(
+            host, port, options
+        )
     if mode == 'controller':
         if host is None:
             raise ValueError('<host>:<port> missing')
-        return await open_android_netsim_controller_transport(host, port)
+        return await open_android_netsim_controller_transport(host, port, options)
 
     raise ValueError('invalid mode option')

bumble/transport/common.py

@@ -20,11 +20,12 @@ import contextlib
 import struct
 import asyncio
 import logging
-from typing import ContextManager
+import io
+from typing import ContextManager, Tuple, Optional, Protocol, Dict
 
-from .. import hci
-from ..colors import color
-from ..snoop import Snooper
+from bumble import hci
+from bumble.colors import color
+from bumble.snoop import Snooper
 
 
 # -----------------------------------------------------------------------------
@@ -36,7 +37,7 @@ logger = logging.getLogger(__name__)
 # Information needed to parse HCI packets with a generic parser:
 # For each packet type, the info represents:
 # (length-size, length-offset, unpack-type)
-HCI_PACKET_INFO = {
+HCI_PACKET_INFO: Dict[int, Tuple[int, int, str]] = {
     hci.HCI_COMMAND_PACKET: (1, 2, 'B'),
     hci.HCI_ACL_DATA_PACKET: (2, 2, 'H'),
     hci.HCI_SYNCHRONOUS_DATA_PACKET: (1, 2, 'B'),
@@ -44,6 +45,8 @@ HCI_PACKET_INFO = {
 }
 
 
+# -----------------------------------------------------------------------------
+# Errors
 # -----------------------------------------------------------------------------
 class TransportLostError(Exception):
     """
@@ -51,24 +54,36 @@ class TransportLostError(Exception):
     """
 
 
+# -----------------------------------------------------------------------------
+# Typing Protocols
+# -----------------------------------------------------------------------------
+class TransportSink(Protocol):
+    def on_packet(self, packet: bytes) -> None:
+        ...
+
+
+class TransportSource(Protocol):
+    terminated: asyncio.Future[None]
+
+    def set_packet_sink(self, sink: TransportSink) -> None:
+        ...
+
+
 # -----------------------------------------------------------------------------
 class PacketPump:
     """
     Pump HCI packets from a reader to a sink.
     """
 
-    def __init__(self, reader, sink):
+    def __init__(self, reader: AsyncPacketReader, sink: TransportSink) -> None:
         self.reader = reader
         self.sink = sink
 
-    async def run(self):
+    async def run(self) -> None:
         while True:
             try:
-                # Get a packet from the source
-                packet = hci.HCI_Packet.from_bytes(await self.reader.next_packet())
-
                 # Deliver the packet to the sink
-                self.sink.on_packet(packet)
+                self.sink.on_packet(await self.reader.next_packet())
             except Exception as error:
                 logger.warning(f'!!! {error}')
 
@@ -86,18 +101,22 @@ class PacketParser:
     NEED_LENGTH = 1
     NEED_BODY = 2
 
-    def __init__(self, sink=None):
+    sink: Optional[TransportSink]
+    extended_packet_info: Dict[int, Tuple[int, int, str]]
+    packet_info: Optional[Tuple[int, int, str]] = None
+
+    def __init__(self, sink: Optional[TransportSink] = None) -> None:
         self.sink = sink
         self.extended_packet_info = {}
         self.reset()
 
-    def reset(self):
+    def reset(self) -> None:
         self.state = PacketParser.NEED_TYPE
         self.bytes_needed = 1
         self.packet = bytearray()
         self.packet_info = None
 
-    def feed_data(self, data):
+    def feed_data(self, data: bytes) -> None:
         data_offset = 0
         data_left = len(data)
         while data_left and self.bytes_needed:
@@ -118,6 +137,7 @@ class PacketParser:
                     self.state = PacketParser.NEED_LENGTH
                     self.bytes_needed = self.packet_info[0] + self.packet_info[1]
                 elif self.state == PacketParser.NEED_LENGTH:
+                    assert self.packet_info is not None
                     body_length = struct.unpack_from(
                         self.packet_info[2], self.packet, 1 + self.packet_info[1]
                     )[0]
@@ -135,7 +155,7 @@ class PacketParser:
                             )
                     self.reset()
 
-    def set_packet_sink(self, sink):
+    def set_packet_sink(self, sink: TransportSink) -> None:
         self.sink = sink
 
 
@@ -145,10 +165,10 @@ class PacketReader:
     Reader that reads HCI packets from a sync source.
     """
 
-    def __init__(self, source):
+    def __init__(self, source: io.BufferedReader) -> None:
         self.source = source
 
-    def next_packet(self):
+    def next_packet(self) -> Optional[bytes]:
         # Get the packet type
         packet_type = self.source.read(1)
         if len(packet_type) != 1:
@@ -157,7 +177,7 @@ class PacketReader:
         # Get the packet info based on its type
         packet_info = HCI_PACKET_INFO.get(packet_type[0])
         if packet_info is None:
-            raise ValueError(f'invalid packet type {packet_type} found')
+            raise ValueError(f'invalid packet type {packet_type[0]} found')
 
         # Read the header (that includes the length)
         header_size = packet_info[0] + packet_info[1]
@@ -180,17 +200,17 @@ class AsyncPacketReader:
     Reader that reads HCI packets from an async source.
     """
 
-    def __init__(self, source):
+    def __init__(self, source: asyncio.StreamReader) -> None:
         self.source = source
 
-    async def next_packet(self):
+    async def next_packet(self) -> bytes:
         # Get the packet type
         packet_type = await self.source.readexactly(1)
 
         # Get the packet info based on its type
         packet_info = HCI_PACKET_INFO.get(packet_type[0])
         if packet_info is None:
-            raise ValueError(f'invalid packet type {packet_type} found')
+            raise ValueError(f'invalid packet type {packet_type[0]} found')
 
         # Read the header (that includes the length)
         header_size = packet_info[0] + packet_info[1]
@@ -209,11 +229,11 @@ class AsyncPipeSink:
     Sink that forwards packets asynchronously to another sink.
     """
 
-    def __init__(self, sink):
+    def __init__(self, sink: TransportSink) -> None:
         self.sink = sink
         self.loop = asyncio.get_running_loop()
 
-    def on_packet(self, packet):
+    def on_packet(self, packet: bytes) -> None:
         self.loop.call_soon(self.sink.on_packet, packet)
 
 
@@ -223,50 +243,48 @@ class ParserSource:
     Base class designed to be subclassed by transport-specific source classes
     """
 
-    terminated: asyncio.Future
+    terminated: asyncio.Future[None]
     parser: PacketParser
 
-    def __init__(self):
+    def __init__(self) -> None:
         self.parser = PacketParser()
         self.terminated = asyncio.get_running_loop().create_future()
 
-    def set_packet_sink(self, sink):
+    def set_packet_sink(self, sink: TransportSink) -> None:
         self.parser.set_packet_sink(sink)
 
-    def on_transport_lost(self):
+    def on_transport_lost(self) -> None:
         self.terminated.set_result(None)
         if self.parser.sink:
-            try:
+            if hasattr(self.parser.sink, 'on_transport_lost'):
                 self.parser.sink.on_transport_lost()
-            except AttributeError:
-                pass
 
-    async def wait_for_termination(self):
+    async def wait_for_termination(self) -> None:
         """
         Convenience method for backward compatibility. Prefer using the `terminated`
         attribute instead.
         """
         return await self.terminated
 
-    def close(self):
+    def close(self) -> None:
         pass
 
 
 # -----------------------------------------------------------------------------
 class StreamPacketSource(asyncio.Protocol, ParserSource):
-    def data_received(self, data):
+    def data_received(self, data: bytes) -> None:
         self.parser.feed_data(data)
 
 
 # -----------------------------------------------------------------------------
 class StreamPacketSink:
-    def __init__(self, transport):
+    def __init__(self, transport: asyncio.WriteTransport) -> None:
         self.transport = transport
 
-    def on_packet(self, packet):
+    def on_packet(self, packet: bytes) -> None:
         self.transport.write(packet)
 
-    def close(self):
+    def close(self) -> None:
         self.transport.close()
 
 
@@ -286,7 +304,7 @@ class Transport:
         ...
     """
 
-    def __init__(self, source, sink):
+    def __init__(self, source: TransportSource, sink: TransportSink) -> None:
         self.source = source
         self.sink = sink
 
@@ -300,34 +318,39 @@ class Transport:
         return iter((self.source, self.sink))
 
     async def close(self) -> None:
-        self.source.close()
-        self.sink.close()
+        if hasattr(self.source, 'close'):
+            self.source.close()
+        if hasattr(self.sink, 'close'):
+            self.sink.close()
 
 
 # -----------------------------------------------------------------------------
 class PumpedPacketSource(ParserSource):
-    def __init__(self, receive):
+    pump_task: Optional[asyncio.Task[None]]
+
+    def __init__(self, receive) -> None:
         super().__init__()
         self.receive_function = receive
         self.pump_task = None
 
-    def start(self):
-        async def pump_packets():
+    def start(self) -> None:
+        async def pump_packets() -> None:
             while True:
                 try:
                     packet = await self.receive_function()
                     self.parser.feed_data(packet)
-                except asyncio.exceptions.CancelledError:
+                except asyncio.CancelledError:
                     logger.debug('source pump task done')
+                    self.terminated.set_result(None)
                     break
                 except Exception as error:
                     logger.warning(f'exception while waiting for packet: {error}')
-                    self.terminated.set_result(error)
+                    self.terminated.set_exception(error)
                     break
 
         self.pump_task = asyncio.create_task(pump_packets())
 
-    def close(self):
+    def close(self) -> None:
         if self.pump_task:
             self.pump_task.cancel()
 
@@ -339,7 +362,7 @@ class PumpedPacketSink:
         self.packet_queue = asyncio.Queue()
         self.pump_task = None
 
-    def on_packet(self, packet):
+    def on_packet(self, packet: bytes) -> None:
         self.packet_queue.put_nowait(packet)
 
     def start(self):
@@ -348,7 +371,7 @@ class PumpedPacketSink:
                 try:
                     packet = await self.packet_queue.get()
                     await self.send_function(packet)
-                except asyncio.exceptions.CancelledError:
+                except asyncio.CancelledError:
                     logger.debug('sink pump task done')
                     break
                 except Exception as error:
@@ -364,18 +387,20 @@ class PumpedPacketSink:
 
 # -----------------------------------------------------------------------------
 class PumpedTransport(Transport):
-    def __init__(self, source, sink, close_function):
-        super().__init__(source, sink)
-        self.close_function = close_function
+    source: PumpedPacketSource
+    sink: PumpedPacketSink
 
-    def start(self):
+    def __init__(
+        self,
+        source: PumpedPacketSource,
+        sink: PumpedPacketSink,
+    ) -> None:
+        super().__init__(source, sink)
+
+    def start(self) -> None:
         self.source.start()
         self.sink.start()
 
-    async def close(self):
-        await super().close()
-        await self.close_function()
-
 
 # -----------------------------------------------------------------------------
 class SnoopingTransport(Transport):
@@ -397,31 +422,38 @@ class SnoopingTransport(Transport):
         raise RuntimeError('unexpected code path')  # Satisfy the type checker
 
     class Source:
-        def __init__(self, source, snooper):
+        sink: TransportSink
+
+        def __init__(self, source: TransportSource, snooper: Snooper):
             self.source = source
             self.snooper = snooper
-            self.sink = None
+            self.terminated = source.terminated
 
-        def set_packet_sink(self, sink):
+        def set_packet_sink(self, sink: TransportSink) -> None:
             self.sink = sink
             self.source.set_packet_sink(self)
 
-        def on_packet(self, packet):
+        def on_packet(self, packet: bytes) -> None:
             self.snooper.snoop(packet, Snooper.Direction.CONTROLLER_TO_HOST)
             if self.sink:
                 self.sink.on_packet(packet)
 
     class Sink:
-        def __init__(self, sink, snooper):
+        def __init__(self, sink: TransportSink, snooper: Snooper) -> None:
             self.sink = sink
             self.snooper = snooper
 
-        def on_packet(self, packet):
+        def on_packet(self, packet: bytes) -> None:
             self.snooper.snoop(packet, Snooper.Direction.HOST_TO_CONTROLLER)
             if self.sink:
                 self.sink.on_packet(packet)
 
-    def __init__(self, transport, snooper, close_snooper=None):
+    def __init__(
+        self,
+        transport: Transport,
+        snooper: Snooper,
+        close_snooper=None,
+    ) -> None:
         super().__init__(
             self.Source(transport.source, snooper), self.Sink(transport.sink, snooper)
         )

bumble/transport/file.py

@@ -28,7 +28,7 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
-async def open_file_transport(spec):
+async def open_file_transport(spec: str) -> Transport:
     '''
     Open a File transport (typically not for a real file, but for a PTY or other unix
     virtual files).

bumble/transport/hci_socket.py

@@ -23,6 +23,8 @@ import socket
 import ctypes
 import collections
 
+from typing import Optional
+
 from .common import Transport, ParserSource
 
 
@@ -33,7 +35,7 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
-async def open_hci_socket_transport(spec):
+async def open_hci_socket_transport(spec: Optional[str]) -> Transport:
     '''
     Open an HCI Socket (only available on some platforms).
     The parameter string is either empty (to use the first/default Bluetooth adapter)
@@ -45,9 +47,9 @@ async def open_hci_socket_transport(spec):
     # Create a raw HCI socket
     try:
         hci_socket = socket.socket(
-            socket.AF_BLUETOOTH,
-            socket.SOCK_RAW | socket.SOCK_NONBLOCK,
-            socket.BTPROTO_HCI,
+            socket.AF_BLUETOOTH,  # type: ignore[attr-defined]
+            socket.SOCK_RAW | socket.SOCK_NONBLOCK,  # type: ignore[attr-defined]
+            socket.BTPROTO_HCI,  # type: ignore[attr-defined]
         )
     except AttributeError as error:
         # Not supported on this platform
@@ -78,7 +80,7 @@ async def open_hci_socket_transport(spec):
     bind_address = struct.pack(
         # pylint: disable=no-member
         '<HHH',
-        socket.AF_BLUETOOTH,
+        socket.AF_BLUETOOTH,  # type: ignore[attr-defined]
         adapter_index,
         HCI_CHANNEL_USER,
     )

bumble/transport/pty.py

@@ -23,6 +23,8 @@ import atexit
 import os
 import logging
 
+from typing import Optional
+
 from .common import Transport, StreamPacketSource, StreamPacketSink
 
 # -----------------------------------------------------------------------------
@@ -32,7 +34,7 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
-async def open_pty_transport(spec):
+async def open_pty_transport(spec: Optional[str]) -> Transport:
     '''
     Open a PTY transport.
     The parameter string may be empty, or a path name where a symbolic link

bumble/transport/pyusb.py

@@ -35,7 +35,7 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
-async def open_pyusb_transport(spec):
+async def open_pyusb_transport(spec: str) -> Transport:
     '''
     Open a USB transport. [Implementation based on PyUSB]
     The parameter string has this syntax:

bumble/transport/serial.py

@@ -28,7 +28,7 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
-async def open_serial_transport(spec):
+async def open_serial_transport(spec: str) -> Transport:
     '''
     Open a serial port transport.
     The parameter string has this syntax:

bumble/transport/tcp_client.py

@@ -27,7 +27,7 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
-async def open_tcp_client_transport(spec):
+async def open_tcp_client_transport(spec: str) -> Transport:
     '''
     Open a TCP client transport.
     The parameter string has this syntax:

bumble/transport/tcp_server.py

@@ -15,6 +15,7 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+from __future__ import annotations
 import asyncio
 import logging
 
@@ -27,7 +28,7 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
-async def open_tcp_server_transport(spec):
+async def open_tcp_server_transport(spec: str) -> Transport:
     '''
     Open a TCP server transport.
     The parameter string has this syntax:
@@ -42,7 +43,7 @@ async def open_tcp_server_transport(spec):
         async def close(self):
             await super().close()
 
-    class TcpServerProtocol:
+    class TcpServerProtocol(asyncio.BaseProtocol):
         def __init__(self, packet_source, packet_sink):
             self.packet_source = packet_source
             self.packet_sink = packet_sink

bumble/transport/udp.py

@@ -27,7 +27,7 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
-async def open_udp_transport(spec):
+async def open_udp_transport(spec: str) -> Transport:
     '''
     Open a UDP transport.
     The parameter string has this syntax:

bumble/transport/usb.py

@@ -60,7 +60,7 @@ def load_libusb():
             usb1.loadLibrary(libusb_dll)
 
 
-async def open_usb_transport(spec):
+async def open_usb_transport(spec: str) -> Transport:
     '''
     Open a USB transport.
     The moniker string has this syntax:

bumble/transport/vhci.py

@@ -17,6 +17,9 @@
 # -----------------------------------------------------------------------------
 import logging
 
+from typing import Optional
+
+from .common import Transport
 from .file import open_file_transport
 
 # -----------------------------------------------------------------------------
@@ -26,7 +29,7 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
-async def open_vhci_transport(spec):
+async def open_vhci_transport(spec: Optional[str]) -> Transport:
     '''
     Open a VHCI transport (only available on some platforms).
     The parameter string is either empty (to use the default VHCI device
@@ -42,15 +45,15 @@ async def open_vhci_transport(spec):
     # Override the source's `data_received` method so that we can
     # filter out the vendor packet that is received just after the
     # initial open
-    def vhci_data_received(data):
+    def vhci_data_received(data: bytes) -> None:
         if len(data) > 0 and data[0] == HCI_VENDOR_PKT:
             if len(data) == 4:
                 hci_index = data[2] << 8 | data[3]
                 logger.info(f'HCI index {hci_index}')
         else:
-            transport.source.parser.feed_data(data)
+            transport.source.parser.feed_data(data)  # type: ignore
 
-    transport.source.data_received = vhci_data_received
+    transport.source.data_received = vhci_data_received  # type: ignore
 
     # Write the initial config
     transport.sink.on_packet(bytes([HCI_VENDOR_PKT, HCI_BREDR]))

bumble/transport/ws_client.py

@@ -16,9 +16,9 @@
 # Imports
 # -----------------------------------------------------------------------------
 import logging
-import websockets
+import websockets.client
 
-from .common import PumpedPacketSource, PumpedPacketSink, PumpedTransport
+from .common import PumpedPacketSource, PumpedPacketSink, PumpedTransport, Transport
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -27,23 +27,25 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
-async def open_ws_client_transport(spec):
+async def open_ws_client_transport(spec: str) -> Transport:
     '''
     Open a WebSocket client transport.
     The parameter string has this syntax:
-    <remote-host>:<remote-port>
+    <websocket-url>
 
-    Example: 127.0.0.1:9001
+    Example: ws://localhost:7681/v1/websocket/bt
     '''
 
-    remote_host, remote_port = spec.split(':')
-    uri = f'ws://{remote_host}:{remote_port}'
-    websocket = await websockets.connect(uri)
+    websocket = await websockets.client.connect(spec)
 
-    transport = PumpedTransport(
+    class WsTransport(PumpedTransport):
+        async def close(self):
+            await super().close()
+            await websocket.close()
+
+    transport = WsTransport(
         PumpedPacketSource(websocket.recv),
         PumpedPacketSink(websocket.send),
-        websocket.close,
     )
     transport.start()
     return transport

bumble/transport/ws_server.py

@@ -15,7 +15,6 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
-import asyncio
 import logging
 import websockets
 
@@ -28,7 +27,7 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
-async def open_ws_server_transport(spec):
+async def open_ws_server_transport(spec: str) -> Transport:
     '''
     Open a WebSocket server transport.
     The parameter string has this syntax:

bumble/utils.py

@@ -15,13 +15,25 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+from __future__ import annotations
 import asyncio
 import logging
 import traceback
 import collections
 import sys
-from typing import Awaitable, Set, TypeVar
-from functools import wraps
+from typing import (
+    Awaitable,
+    Set,
+    TypeVar,
+    List,
+    Tuple,
+    Callable,
+    Any,
+    Optional,
+    Union,
+    overload,
+)
+from functools import wraps, partial
 from pyee import EventEmitter
 
 from .colors import color
@@ -64,6 +76,102 @@ def composite_listener(cls):
     return cls
 
 
+# -----------------------------------------------------------------------------
+_Handler = TypeVar('_Handler', bound=Callable)
+
+
+class EventWatcher:
+    '''A wrapper class to control the lifecycle of event handlers better.
+
+    Usage:
+    ```
+    watcher = EventWatcher()
+
+    def on_foo():
+        ...
+    watcher.on(emitter, 'foo', on_foo)
+
+    @watcher.on(emitter, 'bar')
+    def on_bar():
+        ...
+
+    # Close all event handlers watching through this watcher
+    watcher.close()
+    ```
+
+    As context:
+    ```
+    with contextlib.closing(EventWatcher()) as context:
+        @context.on(emitter, 'foo')
+        def on_foo():
+            ...
+    # on_foo() has been removed here!
+    ```
+    '''
+
+    handlers: List[Tuple[EventEmitter, str, Callable[..., Any]]]
+
+    def __init__(self) -> None:
+        self.handlers = []
+
+    @overload
+    def on(self, emitter: EventEmitter, event: str) -> Callable[[_Handler], _Handler]:
+        ...
+
+    @overload
+    def on(self, emitter: EventEmitter, event: str, handler: _Handler) -> _Handler:
+        ...
+
+    def on(
+        self, emitter: EventEmitter, event: str, handler: Optional[_Handler] = None
+    ) -> Union[_Handler, Callable[[_Handler], _Handler]]:
+        '''Watch an event until the context is closed.
+
+        Args:
+            emitter: EventEmitter to watch
+            event: Event name
+            handler: (Optional) Event handler. When nothing is passed, this method works as a decorator.
+        '''
+
+        def wrapper(f: _Handler) -> _Handler:
+            self.handlers.append((emitter, event, f))
+            emitter.on(event, f)
+            return f
+
+        return wrapper if handler is None else wrapper(handler)
+
+    @overload
+    def once(self, emitter: EventEmitter, event: str) -> Callable[[_Handler], _Handler]:
+        ...
+
+    @overload
+    def once(self, emitter: EventEmitter, event: str, handler: _Handler) -> _Handler:
+        ...
+
+    def once(
+        self, emitter: EventEmitter, event: str, handler: Optional[_Handler] = None
+    ) -> Union[_Handler, Callable[[_Handler], _Handler]]:
+        '''Watch an event for once.
+
+        Args:
+            emitter: EventEmitter to watch
+            event: Event name
+            handler: (Optional) Event handler. When nothing passed, this method works as a decorator.
+        '''
+
+        def wrapper(f: _Handler) -> _Handler:
+            self.handlers.append((emitter, event, f))
+            emitter.once(event, f)
+            return f
+
+        return wrapper if handler is None else wrapper(handler)
+
+    def close(self) -> None:
+        for emitter, event, handler in self.handlers:
+            if handler in emitter.listeners(event):
+                emitter.remove_listener(event, handler)
+
+
 # -----------------------------------------------------------------------------
 _T = TypeVar('_T')
 
@@ -302,3 +410,20 @@ class FlowControlAsyncPipe:
                     self.resume_source()
 
             self.check_pump()
+
+
+async def async_call(function, *args, **kwargs):
+    """
+    Immediately calls the function with provided args and kwargs, wrapping it in an async function.
+    Rust's `pyo3_asyncio` library needs functions to be marked async to properly inject a running loop.
+
+    result = await async_call(some_function, ...)
+    """
+    return function(*args, **kwargs)
+
+
+def wrap_async(function):
+    """
+    Wraps the provided function in an async function.
+    """
+    return partial(async_call, function)

bumble/vendor/android/hci.py

@@ -0,0 +1,318 @@
+# Copyright 2021-2023 Google LLC
+#
+# 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
+#
+#      https://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.
+
+# -----------------------------------------------------------------------------
+# Imports
+# -----------------------------------------------------------------------------
+import struct
+
+from bumble.hci import (
+    name_or_number,
+    hci_vendor_command_op_code,
+    Address,
+    HCI_Constant,
+    HCI_Object,
+    HCI_Command,
+    HCI_Vendor_Event,
+    STATUS_SPEC,
+)
+
+
+# -----------------------------------------------------------------------------
+# Constants
+# -----------------------------------------------------------------------------
+
+# Android Vendor Specific Commands and Events.
+# Only a subset of the commands are implemented here currently.
+#
+# pylint: disable-next=line-too-long
+# See https://source.android.com/docs/core/connect/bluetooth/hci_requirements#chip-capabilities-and-configuration
+HCI_LE_GET_VENDOR_CAPABILITIES_COMMAND = hci_vendor_command_op_code(0x153)
+HCI_LE_APCF_COMMAND = hci_vendor_command_op_code(0x157)
+HCI_GET_CONTROLLER_ACTIVITY_ENERGY_INFO_COMMAND = hci_vendor_command_op_code(0x159)
+HCI_A2DP_HARDWARE_OFFLOAD_COMMAND = hci_vendor_command_op_code(0x15D)
+HCI_BLUETOOTH_QUALITY_REPORT_COMMAND = hci_vendor_command_op_code(0x15E)
+HCI_DYNAMIC_AUDIO_BUFFER_COMMAND = hci_vendor_command_op_code(0x15F)
+
+HCI_BLUETOOTH_QUALITY_REPORT_EVENT = 0x58
+
+HCI_Command.register_commands(globals())
+HCI_Vendor_Event.register_subevents(globals())
+
+
+# -----------------------------------------------------------------------------
+@HCI_Command.command(
+    return_parameters_fields=[
+        ('status', STATUS_SPEC),
+        ('max_advt_instances', 1),
+        ('offloaded_resolution_of_private_address', 1),
+        ('total_scan_results_storage', 2),
+        ('max_irk_list_sz', 1),
+        ('filtering_support', 1),
+        ('max_filter', 1),
+        ('activity_energy_info_support', 1),
+        ('version_supported', 2),
+        ('total_num_of_advt_tracked', 2),
+        ('extended_scan_support', 1),
+        ('debug_logging_supported', 1),
+        ('le_address_generation_offloading_support', 1),
+        ('a2dp_source_offload_capability_mask', 4),
+        ('bluetooth_quality_report_support', 1),
+        ('dynamic_audio_buffer_support', 4),
+    ]
+)
+class HCI_LE_Get_Vendor_Capabilities_Command(HCI_Command):
+    # pylint: disable=line-too-long
+    '''
+    See https://source.android.com/docs/core/connect/bluetooth/hci_requirements#vendor-specific-capabilities
+    '''
+
+    @classmethod
+    def parse_return_parameters(cls, parameters):
+        # There are many versions of this data structure, so we need to parse until
+        # there are no more bytes to parse, and leave un-signal parameters set to
+        # None (older versions)
+        nones = {field: None for field, _ in cls.return_parameters_fields}
+        return_parameters = HCI_Object(cls.return_parameters_fields, **nones)
+
+        try:
+            offset = 0
+            for field in cls.return_parameters_fields:
+                field_name, field_type = field
+                field_value, field_size = HCI_Object.parse_field(
+                    parameters, offset, field_type
+                )
+                setattr(return_parameters, field_name, field_value)
+                offset += field_size
+        except struct.error:
+            pass
+
+        return return_parameters
+
+
+# -----------------------------------------------------------------------------
+@HCI_Command.command(
+    fields=[
+        (
+            'opcode',
+            {
+                'size': 1,
+                'mapper': lambda x: HCI_LE_APCF_Command.opcode_name(x),
+            },
+        ),
+        ('payload', '*'),
+    ],
+    return_parameters_fields=[
+        ('status', STATUS_SPEC),
+        (
+            'opcode',
+            {
+                'size': 1,
+                'mapper': lambda x: HCI_LE_APCF_Command.opcode_name(x),
+            },
+        ),
+        ('payload', '*'),
+    ],
+)
+class HCI_LE_APCF_Command(HCI_Command):
+    # pylint: disable=line-too-long
+    '''
+    See https://source.android.com/docs/core/connect/bluetooth/hci_requirements#le_apcf_command
+
+    NOTE: the subcommand-specific payloads are left as opaque byte arrays in this
+    implementation. A future enhancement may define subcommand-specific data structures.
+    '''
+
+    # APCF Subcommands
+    # TODO: use the OpenIntEnum class (when upcoming PR is merged)
+    APCF_ENABLE = 0x00
+    APCF_SET_FILTERING_PARAMETERS = 0x01
+    APCF_BROADCASTER_ADDRESS = 0x02
+    APCF_SERVICE_UUID = 0x03
+    APCF_SERVICE_SOLICITATION_UUID = 0x04
+    APCF_LOCAL_NAME = 0x05
+    APCF_MANUFACTURER_DATA = 0x06
+    APCF_SERVICE_DATA = 0x07
+    APCF_TRANSPORT_DISCOVERY_SERVICE = 0x08
+    APCF_AD_TYPE_FILTER = 0x09
+    APCF_READ_EXTENDED_FEATURES = 0xFF
+
+    OPCODE_NAMES = {
+        APCF_ENABLE: 'APCF_ENABLE',
+        APCF_SET_FILTERING_PARAMETERS: 'APCF_SET_FILTERING_PARAMETERS',
+        APCF_BROADCASTER_ADDRESS: 'APCF_BROADCASTER_ADDRESS',
+        APCF_SERVICE_UUID: 'APCF_SERVICE_UUID',
+        APCF_SERVICE_SOLICITATION_UUID: 'APCF_SERVICE_SOLICITATION_UUID',
+        APCF_LOCAL_NAME: 'APCF_LOCAL_NAME',
+        APCF_MANUFACTURER_DATA: 'APCF_MANUFACTURER_DATA',
+        APCF_SERVICE_DATA: 'APCF_SERVICE_DATA',
+        APCF_TRANSPORT_DISCOVERY_SERVICE: 'APCF_TRANSPORT_DISCOVERY_SERVICE',
+        APCF_AD_TYPE_FILTER: 'APCF_AD_TYPE_FILTER',
+        APCF_READ_EXTENDED_FEATURES: 'APCF_READ_EXTENDED_FEATURES',
+    }
+
+    @classmethod
+    def opcode_name(cls, opcode):
+        return name_or_number(cls.OPCODE_NAMES, opcode)
+
+
+# -----------------------------------------------------------------------------
+@HCI_Command.command(
+    return_parameters_fields=[
+        ('status', STATUS_SPEC),
+        ('total_tx_time_ms', 4),
+        ('total_rx_time_ms', 4),
+        ('total_idle_time_ms', 4),
+        ('total_energy_used', 4),
+    ],
+)
+class HCI_Get_Controller_Activity_Energy_Info_Command(HCI_Command):
+    # pylint: disable=line-too-long
+    '''
+    See https://source.android.com/docs/core/connect/bluetooth/hci_requirements#le_get_controller_activity_energy_info
+    '''
+
+
+# -----------------------------------------------------------------------------
+@HCI_Command.command(
+    fields=[
+        (
+            'opcode',
+            {
+                'size': 1,
+                'mapper': lambda x: HCI_A2DP_Hardware_Offload_Command.opcode_name(x),
+            },
+        ),
+        ('payload', '*'),
+    ],
+    return_parameters_fields=[
+        ('status', STATUS_SPEC),
+        (
+            'opcode',
+            {
+                'size': 1,
+                'mapper': lambda x: HCI_A2DP_Hardware_Offload_Command.opcode_name(x),
+            },
+        ),
+        ('payload', '*'),
+    ],
+)
+class HCI_A2DP_Hardware_Offload_Command(HCI_Command):
+    # pylint: disable=line-too-long
+    '''
+    See https://source.android.com/docs/core/connect/bluetooth/hci_requirements#a2dp-hardware-offload-support
+
+    NOTE: the subcommand-specific payloads are left as opaque byte arrays in this
+    implementation. A future enhancement may define subcommand-specific data structures.
+    '''
+
+    # A2DP Hardware Offload Subcommands
+    # TODO: use the OpenIntEnum class (when upcoming PR is merged)
+    START_A2DP_OFFLOAD = 0x01
+    STOP_A2DP_OFFLOAD = 0x02
+
+    OPCODE_NAMES = {
+        START_A2DP_OFFLOAD: 'START_A2DP_OFFLOAD',
+        STOP_A2DP_OFFLOAD: 'STOP_A2DP_OFFLOAD',
+    }
+
+    @classmethod
+    def opcode_name(cls, opcode):
+        return name_or_number(cls.OPCODE_NAMES, opcode)
+
+
+# -----------------------------------------------------------------------------
+@HCI_Command.command(
+    fields=[
+        (
+            'opcode',
+            {
+                'size': 1,
+                'mapper': lambda x: HCI_Dynamic_Audio_Buffer_Command.opcode_name(x),
+            },
+        ),
+        ('payload', '*'),
+    ],
+    return_parameters_fields=[
+        ('status', STATUS_SPEC),
+        (
+            'opcode',
+            {
+                'size': 1,
+                'mapper': lambda x: HCI_Dynamic_Audio_Buffer_Command.opcode_name(x),
+            },
+        ),
+        ('payload', '*'),
+    ],
+)
+class HCI_Dynamic_Audio_Buffer_Command(HCI_Command):
+    # pylint: disable=line-too-long
+    '''
+    See https://source.android.com/docs/core/connect/bluetooth/hci_requirements#dynamic-audio-buffer-command
+
+    NOTE: the subcommand-specific payloads are left as opaque byte arrays in this
+    implementation. A future enhancement may define subcommand-specific data structures.
+    '''
+
+    # Dynamic Audio Buffer Subcommands
+    # TODO: use the OpenIntEnum class (when upcoming PR is merged)
+    GET_AUDIO_BUFFER_TIME_CAPABILITY = 0x01
+
+    OPCODE_NAMES = {
+        GET_AUDIO_BUFFER_TIME_CAPABILITY: 'GET_AUDIO_BUFFER_TIME_CAPABILITY',
+    }
+
+    @classmethod
+    def opcode_name(cls, opcode):
+        return name_or_number(cls.OPCODE_NAMES, opcode)
+
+
+# -----------------------------------------------------------------------------
+@HCI_Vendor_Event.event(
+    fields=[
+        ('quality_report_id', 1),
+        ('packet_types', 1),
+        ('connection_handle', 2),
+        ('connection_role', {'size': 1, 'mapper': HCI_Constant.role_name}),
+        ('tx_power_level', -1),
+        ('rssi', -1),
+        ('snr', 1),
+        ('unused_afh_channel_count', 1),
+        ('afh_select_unideal_channel_count', 1),
+        ('lsto', 2),
+        ('connection_piconet_clock', 4),
+        ('retransmission_count', 4),
+        ('no_rx_count', 4),
+        ('nak_count', 4),
+        ('last_tx_ack_timestamp', 4),
+        ('flow_off_count', 4),
+        ('last_flow_on_timestamp', 4),
+        ('buffer_overflow_bytes', 4),
+        ('buffer_underflow_bytes', 4),
+        ('bdaddr', Address.parse_address),
+        ('cal_failed_item_count', 1),
+        ('tx_total_packets', 4),
+        ('tx_unacked_packets', 4),
+        ('tx_flushed_packets', 4),
+        ('tx_last_subevent_packets', 4),
+        ('crc_error_packets', 4),
+        ('rx_duplicate_packets', 4),
+        ('vendor_specific_parameters', '*'),
+    ]
+)
+class HCI_Bluetooth_Quality_Report_Event(HCI_Vendor_Event):
+    # pylint: disable=line-too-long
+    '''
+    See https://source.android.com/docs/core/connect/bluetooth/hci_requirements#bluetooth-quality-report-sub-event
+    '''

bumble/vendor/zephyr/hci.py

@@ -0,0 +1,88 @@
+# Copyright 2021-2023 Google LLC
+#
+# 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
+#
+#      https://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.
+
+# -----------------------------------------------------------------------------
+# Imports
+# -----------------------------------------------------------------------------
+from bumble.hci import (
+    hci_vendor_command_op_code,
+    HCI_Command,
+    STATUS_SPEC,
+)
+
+
+# -----------------------------------------------------------------------------
+# Constants
+# -----------------------------------------------------------------------------
+
+# Zephyr RTOS Vendor Specific Commands and Events.
+# Only a subset of the commands are implemented here currently.
+#
+# pylint: disable-next=line-too-long
+# See https://github.com/zephyrproject-rtos/zephyr/blob/main/include/zephyr/bluetooth/hci_vs.h
+HCI_WRITE_TX_POWER_LEVEL_COMMAND = hci_vendor_command_op_code(0x000E)
+HCI_READ_TX_POWER_LEVEL_COMMAND = hci_vendor_command_op_code(0x000F)
+
+HCI_Command.register_commands(globals())
+
+
+# -----------------------------------------------------------------------------
+class TX_Power_Level_Command:
+    '''
+    Base class for read and write TX power level HCI commands
+    '''
+
+    TX_POWER_HANDLE_TYPE_ADV = 0x00
+    TX_POWER_HANDLE_TYPE_SCAN = 0x01
+    TX_POWER_HANDLE_TYPE_CONN = 0x02
+
+
+# -----------------------------------------------------------------------------
+@HCI_Command.command(
+    fields=[('handle_type', 1), ('connection_handle', 2), ('tx_power_level', -1)],
+    return_parameters_fields=[
+        ('status', STATUS_SPEC),
+        ('handle_type', 1),
+        ('connection_handle', 2),
+        ('selected_tx_power_level', -1),
+    ],
+)
+class HCI_Write_Tx_Power_Level_Command(HCI_Command, TX_Power_Level_Command):
+    '''
+    Write TX power level. See BT_HCI_OP_VS_WRITE_TX_POWER_LEVEL in
+    https://github.com/zephyrproject-rtos/zephyr/blob/main/include/zephyr/bluetooth/hci_vs.h
+
+    Power level is in dB. Connection handle for TX_POWER_HANDLE_TYPE_ADV and
+    TX_POWER_HANDLE_TYPE_SCAN should be zero.
+    '''
+
+
+# -----------------------------------------------------------------------------
+@HCI_Command.command(
+    fields=[('handle_type', 1), ('connection_handle', 2)],
+    return_parameters_fields=[
+        ('status', STATUS_SPEC),
+        ('handle_type', 1),
+        ('connection_handle', 2),
+        ('tx_power_level', -1),
+    ],
+)
+class HCI_Read_Tx_Power_Level_Command(HCI_Command, TX_Power_Level_Command):
+    '''
+    Read TX power level. See BT_HCI_OP_VS_READ_TX_POWER_LEVEL in
+    https://github.com/zephyrproject-rtos/zephyr/blob/main/include/zephyr/bluetooth/hci_vs.h
+
+    Power level is in dB. Connection handle for TX_POWER_HANDLE_TYPE_ADV and
+    TX_POWER_HANDLE_TYPE_SCAN should be zero.
+    '''

docs/mkdocs/mkdocs.yml

@@ -64,8 +64,12 @@ nav:
     - Linux: platforms/linux.md
     - Windows: platforms/windows.md
     - Android: platforms/android.md
+    - Zephyr: platforms/zephyr.md
   - Examples:
     - Overview: examples/index.md
+  - Extras:
+    - Overview: extras/index.md
+    - Android Remote HCI: extras/android_remote_hci.md
 
 copyright: Copyright 2021-2023 Google LLC
 

docs/mkdocs/src/extras/android_remote_hci.md

@@ -0,0 +1,141 @@
+ANDROID REMOTE HCI APP
+======================
+
+This application allows using an android phone's built-in Bluetooth controller with 
+a Bumble host stack running outside the phone (typically a development laptop or desktop).
+The app runs an HCI proxy between a TCP socket on the "outside" and the Bluetooth HCI HAL
+on the "inside". (See [this page](https://source.android.com/docs/core/connect/bluetooth) for a high level 
+description of the Android Bluetooth HCI HAL).
+The HCI packets received on the TCP socket are forwarded to the phone's controller, and the 
+packets coming from the controller are forwarded to the TCP socket.
+
+
+Building
+--------
+
+You can build the app by running `./gradlew build` (use `gradlew.bat` on Windows) from the `RemoteHCI` top level directory.
+You can also build with Android Studio: open the `RemoteHCI` project. You can build and/or debug from there.
+
+If the build succeeds, you can find the app APKs (debug and release) at:
+
+  * [Release] ``app/build/outputs/apk/release/app-release-unsigned.apk``
+  * [Debug] ``app/build/outputs/apk/debug/app-debug.apk``
+
+
+Running
+-------
+
+### Preconditions
+When the proxy starts (tapping the "Start" button in the app's main activity), it will try to 
+bind to the Bluetooth HAL. This requires disabling SELinux temporarily, and being the only HAL client.
+
+#### Disabling SELinux
+Binding to the Bluetooth HCI HAL requires certain SELinux permissions that can't simply be changed
+on a device without rebuilding its system image. To bypass these restrictions, you will need
+to disable SELinux on your phone (please be aware that this is global, not just for the proxy app,
+so proceed with caution).
+In order to disable SELinux, you need to root the phone (it may be advisable to do this on a
+development phone).
+
+!!! tip "Disabling SELinux Temporarily"
+    Restart `adb` as root:
+    ```bash
+    $ adb root
+    ```
+
+    Then disable SELinux
+    ```bash
+    $ adb shell setenforce 0
+    ```
+
+    Once you're done using the proxy, you can restore SELinux, if you need to, with
+    ```bash
+    $ adb shell setenforce 1
+    ```
+
+    This state will also reset to the normal SELinux enforcement when you reboot.
+
+#### Stopping the bluetooth process
+Since the Bluetooth HAL service can only accept one client, and that in normal conditions 
+that client is the Android's bluetooth stack, it is required to first shut down the 
+Android bluetooth stack process.
+
+!!! tip "Checking if the Bluetooth process is running"
+    ```bash
+    $ adb shell "ps -A | grep com.google.android.bluetooth"
+    ```
+    If the process is running, you will get a line like:
+    ```
+    bluetooth 10759 876 17455796 136620 do_epoll_wait 0 S com.google.android.bluetooth
+    ```
+    If you don't, it means that the process is not running and you are clear to proceed.
+
+Simply turning Bluetooth off from the phone's settings does not ensure that the bluetooth process will exit.
+If the bluetooth process is still running after toggling Bluetooth off from the settings, you may try enabling
+Airplane Mode, then rebooting. The bluetooth process should, in theory, not restart after the reboot.
+
+!!! tip "Stopping the bluetooth process with adb"
+    ```bash
+    $ adb shell cmd bluetooth_manager disable
+    ```
+
+### Starting the app
+You can start the app from the Android launcher, from Android Studio, or with `adb`
+
+#### Launching from the launcher
+Just tap the app icon on the launcher, check the TCP port that is configured, and tap
+the "Start" button.
+
+#### Launching with `adb`
+Using the `am` command, you can start the activity, and pass it arguments so that you can
+automatically start the proxy, and/or set the port number.
+
+!!! tip "Launching from adb with auto-start"
+    ```bash
+    $ adb shell am start -n com.github.google.bumble.remotehci/.MainActivity --ez autostart true
+    ```
+
+!!! tip "Launching from adb with auto-start and a port"
+    In this example, we auto-start the proxy upon launch, with the port set to 9995
+    ```bash
+    $ adb shell am start -n com.github.google.bumble.remotehci/.MainActivity --ez autostart true --ei port 9995
+    ```
+
+#### Selecting a TCP port
+The RemoteHCI app's main activity has a "TCP Port" setting where you can change the port on
+which the proxy is accepting connections. If the default value isn't suitable, you can 
+change it there (you can also use the special value 0 to let the OS assign a port number for you).
+
+### Connecting to the proxy
+To connect the Bumble stack to the proxy, you need to be able to reach the phone's network 
+stack. This can be done over the phone's WiFi connection, or, alternatively, using an `adb`
+TCP forward (which should be faster than over WiFi).
+
+!!! tip "Forwarding TCP with `adb`"
+    To connect to the proxy via an `adb` TCP forward, use:
+    ```bash
+    $ adb forward tcp:<outside-port> tcp:<inside-port>
+    ```
+    Where ``<outside-port>`` is the port number for a listening socket on your laptop or 
+    desktop machine, and <inside-port> is the TCP port selected in the app's user interface.
+    Those two ports may be the same, of course.
+    For example, with the default TCP port 9993:
+    ```bash
+    $ adb forward tcp:9993 tcp:9993
+    ```
+
+Once you've ensured that you can reach the proxy's TCP port on the phone, either directly or
+via an `adb` forward, you can then use it as a Bumble transport, using the transport name: 
+``tcp-client:<host>:<port>`` syntax.
+
+!!! example "Connecting a Bumble client"
+    Connecting the `bumble-controller-info` app to the phone's controller.
+    Assuming you have set up an `adb` forward on port 9993:
+    ```bash
+    $ bumble-controller-info tcp-client:localhost:9993
+    ```
+
+    Or over WiFi with, in this example, the IP address of the phone being ```192.168.86.27```
+    ```bash
+    $ bumble-controller-info tcp-client:192.168.86.27:9993
+    ```

docs/mkdocs/src/extras/index.md

@@ -0,0 +1,11 @@
+EXTRAS
+======
+
+A collection of add-ons, apps and tools, to the Bumble project.
+
+Android Remote HCI
+------------------
+
+Allows using an Android phone's built-in Bluetooth controller with a Bumble
+stack running on a development machine.
+See [Android Remote HCI](android_remote_hci.md) for details.

docs/mkdocs/src/hardware/index.md

@@ -3,7 +3,7 @@ HARDWARE
 
 The Bumble Host connects to a controller over an [HCI Transport](../transports/index.md).
 To use a hardware controller attached to the host on which the host application is running, the transport is typically either [HCI over UART](../transports/serial.md) or [HCI over USB](../transports/usb.md).
-On Linux, the [VHCI Transport](../transports/vhci.md) can be used to communicate with any controller hardware managed by the operating system. Alternatively, a remote controller (a phyiscal controller attached to a remote host) can be used by connecting one of the networked transports (such as the [TCP Client transport](../transports/tcp_client.md), the [TCP Server transport](../transports/tcp_server.md) or the [UDP Transport](../transports/udp.md)) to an [HCI Bridge](../apps_and_tools/hci_bridge) bridging the network transport to a physical controller on a remote host.
+On Linux, the [VHCI Transport](../transports/vhci.md) can be used to communicate with any controller hardware managed by the operating system. Alternatively, a remote controller (a phyiscal controller attached to a remote host) can be used by connecting one of the networked transports (such as the [TCP Client transport](../transports/tcp_client.md), the [TCP Server transport](../transports/tcp_server.md) or the [UDP Transport](../transports/udp.md)) to an [HCI Bridge](../apps_and_tools/hci_bridge.md) bridging the network transport to a physical controller on a remote host.
 
 In theory, any controller that is compliant with the HCI over UART or HCI over USB protocols can be used.
 

docs/mkdocs/src/platforms/index.md

@@ -9,3 +9,4 @@ For platform-specific information, see the following pages:
   * :material-linux: Linux - see the [Linux platform page](linux.md)
   * :material-microsoft-windows: Windows - see the [Windows platform page](windows.md)
   * :material-android: Android - see the [Android platform page](android.md)
+  * :material-memory: Zephyr - see the [Zephyr platform page](zephyr.md)

docs/mkdocs/src/platforms/zephyr.md

@@ -0,0 +1,51 @@
+:material-memory: ZEPHYR PLATFORM
+=================================
+
+Set TX Power on nRF52840
+------------------------
+
+The Nordic nRF52840 supports Zephyr's vendor specific HCI command for setting TX
+power during advertising, connection, or scanning. With the example [HCI
+USB](https://docs.zephyrproject.org/latest/samples/bluetooth/hci_usb/README.html)
+application, an [nRF52840
+dongle](https://www.nordicsemi.com/Products/Development-
+hardware/nRF52840-Dongle) can be used as a Bumble controller.
+
+To add dynamic TX power support to the HCI USB application, add the following to
+`zephyr/samples/bluetooth/hci_usb/prj.conf` and build.
+
+```
+CONFIG_BT_CTLR_ADVANCED_FEATURES=y
+CONFIG_BT_CTLR_CONN_RSSI=y
+CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y
+```
+
+Alternatively, a prebuilt firmware application can be downloaded here:
+[hci_usb.zip](../downloads/zephyr/hci_usb.zip).
+
+Put the nRF52840 dongle into bootloader mode by pressing the RESET button. The
+LED should pulse red. Load the firmware application with the `nrfutil` tool:
+
+```
+nrfutil dfu usb-serial -pkg hci_usb.zip -p /dev/ttyACM0
+```
+
+The vendor specific HCI commands to read and write TX power are defined in
+`bumble/vendor/zephyr/hci.py` and may be used as such:
+
+```python
+from bumble.vendor.zephyr.hci import HCI_Write_Tx_Power_Level_Command
+
+# set advertising power to -4 dB
+response = await host.send_command(
+    HCI_Write_Tx_Power_Level_Command(
+        handle_type=HCI_Write_Tx_Power_Level_Command.TX_POWER_HANDLE_TYPE_ADV,
+        connection_handle=0,
+        tx_power_level=-4,
+    )
+)
+
+if response.return_parameters.status == HCI_SUCCESS:
+    print(f"TX power set to {response.return_parameters.selected_tx_power_level}")
+
+```

examples/run_hfp_gateway.py

@@ -16,11 +16,9 @@
 # Imports
 # -----------------------------------------------------------------------------
 import asyncio
-import collections
 import sys
 import os
 import logging
-from typing import Union
 
 from bumble.colors import color
 
@@ -32,8 +30,7 @@ from bumble.core import (
     BT_RFCOMM_PROTOCOL_ID,
     BT_BR_EDR_TRANSPORT,
 )
-from bumble import rfcomm
-from bumble.rfcomm import Client
+from bumble import rfcomm, hfp
 from bumble.sdp import (
     Client as SDP_Client,
     DataElement,
@@ -47,61 +44,6 @@ from bumble.sdp import (
 logger = logging.getLogger(__name__)
 
 
-# -----------------------------------------------------------------------------
-# Protocol Support
-# -----------------------------------------------------------------------------
-
-# -----------------------------------------------------------------------------
-class HfpProtocol:
-    dlc: rfcomm.DLC
-    buffer: str
-    lines: collections.deque
-    lines_available: asyncio.Event
-
-    def __init__(self, dlc: rfcomm.DLC) -> None:
-        self.dlc = dlc
-        self.buffer = ''
-        self.lines = collections.deque()
-        self.lines_available = asyncio.Event()
-
-        dlc.sink = self.feed
-
-    def feed(self, data: Union[bytes, str]) -> None:
-        # Convert the data to a string if needed
-        if isinstance(data, bytes):
-            data = data.decode('utf-8')
-
-        logger.debug(f'<<< Data received: {data}')
-
-        # Add to the buffer and look for lines
-        self.buffer += data
-        while (separator := self.buffer.find('\r')) >= 0:
-            line = self.buffer[:separator].strip()
-            self.buffer = self.buffer[separator + 1 :]
-            if len(line) > 0:
-                self.on_line(line)
-
-    def on_line(self, line: str) -> None:
-        self.lines.append(line)
-        self.lines_available.set()
-
-    def send_command_line(self, line: str) -> None:
-        logger.debug(color(f'>>> {line}', 'yellow'))
-        self.dlc.write(line + '\r')
-
-    def send_response_line(self, line: str) -> None:
-        logger.debug(color(f'>>> {line}', 'yellow'))
-        self.dlc.write('\r\n' + line + '\r\n')
-
-    async def next_line(self) -> str:
-        await self.lines_available.wait()
-        line = self.lines.popleft()
-        if not self.lines:
-            self.lines_available.clear()
-        logger.debug(color(f'<<< {line}', 'green'))
-        return line
-
-
 # -----------------------------------------------------------------------------
 # pylint: disable-next=too-many-nested-blocks
 async def list_rfcomm_channels(device, connection):
@@ -241,7 +183,7 @@ async def main():
 
         # Create a client and start it
         print('@@@ Starting to RFCOMM client...')
-        rfcomm_client = Client(device, connection)
+        rfcomm_client = rfcomm.Client(device, connection)
         rfcomm_mux = await rfcomm_client.start()
         print('@@@ Started')
 
@@ -256,7 +198,7 @@ async def main():
             return
 
         # Protocol loop (just for testing at this point)
-        protocol = HfpProtocol(session)
+        protocol = hfp.HfpProtocol(session)
         while True:
             line = await protocol.next_line()
 

examples/run_rfcomm_server.py

@@ -20,83 +20,109 @@ import sys
 import os
 import logging
 
+from bumble.core import UUID
 from bumble.device import Device
 from bumble.transport import open_transport_or_link
-from bumble.core import BT_L2CAP_PROTOCOL_ID, BT_RFCOMM_PROTOCOL_ID, UUID
 from bumble.rfcomm import Server
-from bumble.sdp import (
-    DataElement,
-    ServiceAttribute,
-    SDP_PUBLIC_BROWSE_ROOT,
-    SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
-    SDP_BROWSE_GROUP_LIST_ATTRIBUTE_ID,
-    SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID,
-    SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
-)
+from bumble.utils import AsyncRunner
+from bumble.rfcomm import make_service_sdp_records
 
 
 # -----------------------------------------------------------------------------
-def sdp_records(channel):
+def sdp_records(channel, uuid):
+    service_record_handle = 0x00010001
     return {
-        0x00010001: [
-            ServiceAttribute(
-                SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
-                DataElement.unsigned_integer_32(0x00010001),
-            ),
-            ServiceAttribute(
-                SDP_BROWSE_GROUP_LIST_ATTRIBUTE_ID,
-                DataElement.sequence([DataElement.uuid(SDP_PUBLIC_BROWSE_ROOT)]),
-            ),
-            ServiceAttribute(
-                SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID,
-                DataElement.sequence(
-                    [DataElement.uuid(UUID('E6D55659-C8B4-4B85-96BB-B1143AF6D3AE'))]
-                ),
-            ),
-            ServiceAttribute(
-                SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
-                DataElement.sequence(
-                    [
-                        DataElement.sequence([DataElement.uuid(BT_L2CAP_PROTOCOL_ID)]),
-                        DataElement.sequence(
-                            [
-                                DataElement.uuid(BT_RFCOMM_PROTOCOL_ID),
-                                DataElement.unsigned_integer_8(channel),
-                            ]
-                        ),
-                    ]
-                ),
-            ),
-        ]
+        service_record_handle: make_service_sdp_records(
+            service_record_handle, channel, UUID(uuid)
+        )
     }
 
 
 # -----------------------------------------------------------------------------
-def on_dlc(dlc):
-    print('*** DLC connected', dlc)
-    dlc.sink = lambda data: on_rfcomm_data_received(dlc, data)
+def on_rfcomm_session(rfcomm_session, tcp_server):
+    print('*** RFComm session connected', rfcomm_session)
+    tcp_server.attach_session(rfcomm_session)
 
 
 # -----------------------------------------------------------------------------
-def on_rfcomm_data_received(dlc, data):
-    print(f'<<< Data received: {data.hex()}')
-    try:
-        message = data.decode('utf-8')
-        print(f'<<< Message = {message}')
-    except Exception:
-        pass
+class TcpServerProtocol(asyncio.Protocol):
+    def __init__(self, server):
+        self.server = server
 
-    # Echo everything back
-    dlc.write(data)
+    def connection_made(self, transport):
+        peer_name = transport.get_extra_info('peer_name')
+        print(f'<<< TCP Server: connection from {peer_name}')
+        if self.server:
+            self.server.tcp_transport = transport
+        else:
+            transport.close()
+
+    def connection_lost(self, exc):
+        print('<<< TCP Server: connection lost')
+        if self.server:
+            self.server.tcp_transport = None
+
+    def data_received(self, data):
+        print(f'<<< TCP Server: data received: {len(data)} bytes - {data.hex()}')
+        if self.server:
+            self.server.tcp_data_received(data)
+
+
+# -----------------------------------------------------------------------------
+class TcpServer:
+    def __init__(self, port):
+        self.rfcomm_session = None
+        self.tcp_transport = None
+        AsyncRunner.spawn(self.run(port))
+
+    def attach_session(self, rfcomm_session):
+        if self.rfcomm_session:
+            self.rfcomm_session.sink = None
+
+        self.rfcomm_session = rfcomm_session
+        rfcomm_session.sink = self.rfcomm_data_received
+
+    def rfcomm_data_received(self, data):
+        print(f'<<< RFCOMM Data: {data.hex()}')
+        if self.tcp_transport:
+            self.tcp_transport.write(data)
+        else:
+            print('!!! no TCP connection, dropping data')
+
+    def tcp_data_received(self, data):
+        if self.rfcomm_session:
+            self.rfcomm_session.write(data)
+        else:
+            print('!!! no RFComm session, dropping data')
+
+    async def run(self, port):
+        print(f'$$$ Starting TCP server on port {port}')
+
+        server = await asyncio.get_running_loop().create_server(
+            lambda: TcpServerProtocol(self), '127.0.0.1', port
+        )
+
+        async with server:
+            await server.serve_forever()
 
 
 # -----------------------------------------------------------------------------
 async def main():
-    if len(sys.argv) < 3:
-        print('Usage: run_rfcomm_server.py <device-config> <transport-spec>')
-        print('example: run_rfcomm_server.py classic2.json usb:04b4:f901')
+    if len(sys.argv) < 4:
+        print(
+            'Usage: run_rfcomm_server.py <device-config> <transport-spec> '
+            '<tcp-port> [<uuid>]'
+        )
+        print('example: run_rfcomm_server.py classic2.json usb:0 8888')
         return
 
+    tcp_port = int(sys.argv[3])
+
+    if len(sys.argv) >= 5:
+        uuid = sys.argv[4]
+    else:
+        uuid = 'E6D55659-C8B4-4B85-96BB-B1143AF6D3AE'
+
     print('<<< connecting to HCI...')
     async with await open_transport_or_link(sys.argv[2]) as (hci_source, hci_sink):
         print('<<< connected')
@@ -105,15 +131,20 @@ async def main():
         device = Device.from_config_file_with_hci(sys.argv[1], hci_source, hci_sink)
         device.classic_enabled = True
 
-        # Create and register a server
+        # Create a TCP server
+        tcp_server = TcpServer(tcp_port)
+
+        # Create and register an RFComm server
         rfcomm_server = Server(device)
 
         # Listen for incoming DLC connections
-        channel_number = rfcomm_server.listen(on_dlc)
-        print(f'### Listening for connection on channel {channel_number}')
+        channel_number = rfcomm_server.listen(
+            lambda session: on_rfcomm_session(session, tcp_server)
+        )
+        print(f'### Listening for RFComm connections on channel {channel_number}')
 
         # Setup the SDP to advertise this channel
-        device.sdp_service_records = sdp_records(channel_number)
+        device.sdp_service_records = sdp_records(channel_number, uuid)
 
         # Start the controller
         await device.power_on()

extras/android/RemoteHCI/.gitignore

@@ -0,0 +1,10 @@
+*.iml
+.gradle
+/local.properties
+/.idea
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

extras/android/RemoteHCI/app/.gitignore

@@ -0,0 +1 @@
+/build

extras/android/RemoteHCI/app/build.gradle.kts

@@ -0,0 +1,73 @@
+@Suppress("DSL_SCOPE_VIOLATION") // TODO: Remove once KTIJ-19369 is fixed
+plugins {
+    alias(libs.plugins.androidApplication)
+    alias(libs.plugins.kotlinAndroid)
+}
+
+android {
+    namespace = "com.github.google.bumble.remotehci"
+    compileSdk = 33
+
+    defaultConfig {
+        applicationId = "com.github.google.bumble.remotehci"
+        minSdk = 26
+        targetSdk = 33
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        vectorDrawables {
+            useSupportLibrary = true
+        }
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+    buildFeatures {
+        compose = true
+        aidl = false
+    }
+    composeOptions {
+        kotlinCompilerExtensionVersion = "1.4.3"
+    }
+    packaging {
+        resources {
+            excludes += "/META-INF/{AL2.0,LGPL2.1}"
+        }
+    }
+}
+
+dependencies {
+    implementation(kotlin("reflect"))
+    implementation(libs.core.ktx)
+    implementation(libs.lifecycle.runtime.ktx)
+    implementation(libs.activity.compose)
+    implementation(platform(libs.compose.bom))
+    implementation(libs.ui)
+    implementation(libs.ui.graphics)
+    implementation(libs.ui.tooling.preview)
+    implementation(libs.material3)
+    compileOnly(project(":lib"))
+    testImplementation(libs.junit)
+    androidTestImplementation(libs.androidx.test.ext.junit)
+    androidTestImplementation(libs.espresso.core)
+    androidTestImplementation(platform(libs.compose.bom))
+    androidTestImplementation(libs.ui.test.junit4)
+    debugImplementation(libs.ui.tooling)
+    debugImplementation(libs.ui.test.manifest)
+    //compileOnly(files("${project.rootDir.absolutePath}/sdk/framework.jar"))
+}

extras/android/RemoteHCI/app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

extras/android/RemoteHCI/app/src/main/AndroidManifest.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.RemoteHCI"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:label="@string/app_name"
+            android:theme="@style/Theme.RemoteHCI">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

extras/android/RemoteHCI/app/src/main/aidl/android/hardware/bluetooth/IBluetoothHci.aidl

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// 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.bluetooth;
+@VintfStability
+interface IBluetoothHci {
+  void close();
+  void initialize(in android.hardware.bluetooth.IBluetoothHciCallbacks callback);
+  void sendAclData(in byte[] data);
+  void sendHciCommand(in byte[] command);
+  void sendIsoData(in byte[] data);
+  void sendScoData(in byte[] data);
+}

extras/android/RemoteHCI/app/src/main/aidl/android/hardware/bluetooth/IBluetoothHciCallbacks.aidl

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// 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.bluetooth;
+@VintfStability
+interface IBluetoothHciCallbacks {
+  void aclDataReceived(in byte[] data);
+  void hciEventReceived(in byte[] event);
+  void initializationComplete(in android.hardware.bluetooth.Status status);
+  void isoDataReceived(in byte[] data);
+  void scoDataReceived(in byte[] data);
+}

extras/android/RemoteHCI/app/src/main/aidl/android/hardware/bluetooth/Status.aidl

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// 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.bluetooth;
+@Backing(type="int")
+@VintfStability
+enum Status {
+  SUCCESS = 0,
+  ALREADY_INITIALIZED = 1,
+  UNABLE_TO_OPEN_INTERFACE = 2,
+  HARDWARE_INITIALIZATION_ERROR = 3,
+  UNKNOWN = 4,
+}

extras/android/RemoteHCI/app/src/main/hidl/bluetooth/1.1/IBluetoothHci.hal

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2019 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.bluetooth@1.1;
+
+import @1.0::HciPacket;
+import @1.0::IBluetoothHci;
+import IBluetoothHciCallbacks;
+
+/**
+ * The Host Controller Interface (HCI) is the layer defined by the Bluetooth
+ * specification between the software that runs on the host and the Bluetooth
+ * controller chip. This boundary is the natural choice for a Hardware
+ * Abstraction Layer (HAL). Dealing only in HCI packets and events simplifies
+ * the stack and abstracts away power management, initialization, and other
+ * implementation-specific details related to the hardware.
+ */
+interface IBluetoothHci extends @1.0::IBluetoothHci {
+    /**
+     * Same as @1.0, but uses 1.1 Callbacks version
+     */
+    initialize_1_1(@1.1::IBluetoothHciCallbacks callback);
+
+    /**
+     * Send an ISO data packet (as specified in the Bluetooth Core
+     * Specification v5.2) to the Bluetooth controller.
+     * Packets must be processed in order.
+     * @param data HCI data packet to be sent
+     */
+    sendIsoData(HciPacket data);
+};

extras/android/RemoteHCI/app/src/main/hidl/bluetooth/1.1/IBluetoothHciCallbacks.hal

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2019 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.bluetooth@1.1;
+
+import @1.0::HciPacket;
+import @1.0::IBluetoothHciCallbacks;
+
+/**
+ * The interface from the Bluetooth Controller to the stack.
+ */
+interface IBluetoothHciCallbacks extends @1.0::IBluetoothHciCallbacks {
+    /**
+     * Send a ISO data packet form the controller to the host.
+     * @param data the ISO HCI packet to be passed to the host stack
+     */
+    isoDataReceived(HciPacket data);
+};

extras/android/RemoteHCI/app/src/main/java/android/hardware/bluetooth/IBluetoothHci.java

@@ -0,0 +1,259 @@
+/*
+ * This file is auto-generated.  DO NOT MODIFY.
+ */
+package android.hardware.bluetooth;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+public interface IBluetoothHci extends android.os.IInterface
+{
+  /** Default implementation for IBluetoothHci. */
+  public static class Default implements android.hardware.bluetooth.IBluetoothHci
+  {
+    @Override public void close() throws android.os.RemoteException
+    {
+    }
+    @Override public void initialize(android.hardware.bluetooth.IBluetoothHciCallbacks callback) throws android.os.RemoteException
+    {
+    }
+    @Override public void sendAclData(byte[] data) throws android.os.RemoteException
+    {
+    }
+    @Override public void sendHciCommand(byte[] command) throws android.os.RemoteException
+    {
+    }
+    @Override public void sendIsoData(byte[] data) throws android.os.RemoteException
+    {
+    }
+    @Override public void sendScoData(byte[] data) throws android.os.RemoteException
+    {
+    }
+    @Override
+    public android.os.IBinder asBinder() {
+      return null;
+    }
+  }
+  /** Local-side IPC implementation stub class. */
+  public static abstract class Stub extends android.os.Binder implements android.hardware.bluetooth.IBluetoothHci
+  {
+    /** Construct the stub at attach it to the interface. */
+    public Stub()
+    {
+      //this.markVintfStability();
+      try {
+        Method method = this.getClass().getMethod("markVintfStability", (Class<?>[])null);
+        method.invoke(this);
+      } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
+        throw new RuntimeException(e);
+      }
+      this.attachInterface(this, DESCRIPTOR);
+    }
+    /**
+     * Cast an IBinder object into an android.hardware.bluetooth.IBluetoothHci interface,
+     * generating a proxy if needed.
+     */
+    public static android.hardware.bluetooth.IBluetoothHci asInterface(android.os.IBinder obj)
+    {
+      if ((obj==null)) {
+        return null;
+      }
+      android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR);
+      if (((iin!=null)&&(iin instanceof android.hardware.bluetooth.IBluetoothHci))) {
+        return ((android.hardware.bluetooth.IBluetoothHci)iin);
+      }
+      return new android.hardware.bluetooth.IBluetoothHci.Stub.Proxy(obj);
+    }
+    @Override public android.os.IBinder asBinder()
+    {
+      return this;
+    }
+    @Override public boolean onTransact(int code, android.os.Parcel data, android.os.Parcel reply, int flags) throws android.os.RemoteException
+    {
+      java.lang.String descriptor = DESCRIPTOR;
+      if (code >= android.os.IBinder.FIRST_CALL_TRANSACTION && code <= android.os.IBinder.LAST_CALL_TRANSACTION) {
+        data.enforceInterface(descriptor);
+      }
+      switch (code)
+      {
+        case INTERFACE_TRANSACTION:
+        {
+          reply.writeString(descriptor);
+          return true;
+        }
+      }
+      switch (code)
+      {
+        case TRANSACTION_close:
+        {
+          this.close();
+          reply.writeNoException();
+          break;
+        }
+        case TRANSACTION_initialize:
+        {
+          android.hardware.bluetooth.IBluetoothHciCallbacks _arg0;
+          _arg0 = android.hardware.bluetooth.IBluetoothHciCallbacks.Stub.asInterface(data.readStrongBinder());
+          this.initialize(_arg0);
+          reply.writeNoException();
+          break;
+        }
+        case TRANSACTION_sendAclData:
+        {
+          byte[] _arg0;
+          _arg0 = data.createByteArray();
+          this.sendAclData(_arg0);
+          reply.writeNoException();
+          break;
+        }
+        case TRANSACTION_sendHciCommand:
+        {
+          byte[] _arg0;
+          _arg0 = data.createByteArray();
+          this.sendHciCommand(_arg0);
+          reply.writeNoException();
+          break;
+        }
+        case TRANSACTION_sendIsoData:
+        {
+          byte[] _arg0;
+          _arg0 = data.createByteArray();
+          this.sendIsoData(_arg0);
+          reply.writeNoException();
+          break;
+        }
+        case TRANSACTION_sendScoData:
+        {
+          byte[] _arg0;
+          _arg0 = data.createByteArray();
+          this.sendScoData(_arg0);
+          reply.writeNoException();
+          break;
+        }
+        default:
+        {
+          return super.onTransact(code, data, reply, flags);
+        }
+      }
+      return true;
+    }
+    private static class Proxy implements android.hardware.bluetooth.IBluetoothHci
+    {
+      private android.os.IBinder mRemote;
+      Proxy(android.os.IBinder remote)
+      {
+        mRemote = remote;
+      }
+      @Override public android.os.IBinder asBinder()
+      {
+        return mRemote;
+      }
+      public java.lang.String getInterfaceDescriptor()
+      {
+        return DESCRIPTOR;
+      }
+      @Override public void close() throws android.os.RemoteException
+      {
+        android.os.Parcel _data = android.os.Parcel.obtain();
+        android.os.Parcel _reply = android.os.Parcel.obtain();
+        try {
+          _data.writeInterfaceToken(DESCRIPTOR);
+          boolean _status = mRemote.transact(Stub.TRANSACTION_close, _data, _reply, 0);
+          _reply.readException();
+        }
+        finally {
+          _reply.recycle();
+          _data.recycle();
+        }
+      }
+      @Override public void initialize(android.hardware.bluetooth.IBluetoothHciCallbacks callback) throws android.os.RemoteException
+      {
+        android.os.Parcel _data = android.os.Parcel.obtain();
+        android.os.Parcel _reply = android.os.Parcel.obtain();
+        try {
+          _data.writeInterfaceToken(DESCRIPTOR);
+          _data.writeStrongInterface(callback);
+          boolean _status = mRemote.transact(Stub.TRANSACTION_initialize, _data, _reply, 0);
+          _reply.readException();
+        }
+        finally {
+          _reply.recycle();
+          _data.recycle();
+        }
+      }
+      @Override public void sendAclData(byte[] data) throws android.os.RemoteException
+      {
+        android.os.Parcel _data = android.os.Parcel.obtain();
+        android.os.Parcel _reply = android.os.Parcel.obtain();
+        try {
+          _data.writeInterfaceToken(DESCRIPTOR);
+          _data.writeByteArray(data);
+          boolean _status = mRemote.transact(Stub.TRANSACTION_sendAclData, _data, _reply, 0);
+          _reply.readException();
+        }
+        finally {
+          _reply.recycle();
+          _data.recycle();
+        }
+      }
+      @Override public void sendHciCommand(byte[] command) throws android.os.RemoteException
+      {
+        android.os.Parcel _data = android.os.Parcel.obtain();
+        android.os.Parcel _reply = android.os.Parcel.obtain();
+        try {
+          _data.writeInterfaceToken(DESCRIPTOR);
+          _data.writeByteArray(command);
+          boolean _status = mRemote.transact(Stub.TRANSACTION_sendHciCommand, _data, _reply, 0);
+          _reply.readException();
+        }
+        finally {
+          _reply.recycle();
+          _data.recycle();
+        }
+      }
+      @Override public void sendIsoData(byte[] data) throws android.os.RemoteException
+      {
+        android.os.Parcel _data = android.os.Parcel.obtain();
+        android.os.Parcel _reply = android.os.Parcel.obtain();
+        try {
+          _data.writeInterfaceToken(DESCRIPTOR);
+          _data.writeByteArray(data);
+          boolean _status = mRemote.transact(Stub.TRANSACTION_sendIsoData, _data, _reply, 0);
+          _reply.readException();
+        }
+        finally {
+          _reply.recycle();
+          _data.recycle();
+        }
+      }
+      @Override public void sendScoData(byte[] data) throws android.os.RemoteException
+      {
+        android.os.Parcel _data = android.os.Parcel.obtain();
+        android.os.Parcel _reply = android.os.Parcel.obtain();
+        try {
+          _data.writeInterfaceToken(DESCRIPTOR);
+          _data.writeByteArray(data);
+          boolean _status = mRemote.transact(Stub.TRANSACTION_sendScoData, _data, _reply, 0);
+          _reply.readException();
+        }
+        finally {
+          _reply.recycle();
+          _data.recycle();
+        }
+      }
+    }
+    static final int TRANSACTION_close = (android.os.IBinder.FIRST_CALL_TRANSACTION + 0);
+    static final int TRANSACTION_initialize = (android.os.IBinder.FIRST_CALL_TRANSACTION + 1);
+    static final int TRANSACTION_sendAclData = (android.os.IBinder.FIRST_CALL_TRANSACTION + 2);
+    static final int TRANSACTION_sendHciCommand = (android.os.IBinder.FIRST_CALL_TRANSACTION + 3);
+    static final int TRANSACTION_sendIsoData = (android.os.IBinder.FIRST_CALL_TRANSACTION + 4);
+    static final int TRANSACTION_sendScoData = (android.os.IBinder.FIRST_CALL_TRANSACTION + 5);
+  }
+  public static final java.lang.String DESCRIPTOR = "android$hardware$bluetooth$IBluetoothHci".replace('$', '.');
+  public void close() throws android.os.RemoteException;
+  public void initialize(android.hardware.bluetooth.IBluetoothHciCallbacks callback) throws android.os.RemoteException;
+  public void sendAclData(byte[] data) throws android.os.RemoteException;
+  public void sendHciCommand(byte[] command) throws android.os.RemoteException;
+  public void sendIsoData(byte[] data) throws android.os.RemoteException;
+  public void sendScoData(byte[] data) throws android.os.RemoteException;
+}

extras/android/RemoteHCI/app/src/main/java/android/hardware/bluetooth/IBluetoothHciCallbacks.java

@@ -0,0 +1,234 @@
+/*
+ * This file is auto-generated.  DO NOT MODIFY.
+ */
+package android.hardware.bluetooth;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+public interface IBluetoothHciCallbacks extends android.os.IInterface
+{
+  /** Default implementation for IBluetoothHciCallbacks. */
+  public static class Default implements android.hardware.bluetooth.IBluetoothHciCallbacks
+  {
+    @Override public void aclDataReceived(byte[] data) throws android.os.RemoteException
+    {
+    }
+    @Override public void hciEventReceived(byte[] event) throws android.os.RemoteException
+    {
+    }
+    @Override public void initializationComplete(int status) throws android.os.RemoteException
+    {
+    }
+    @Override public void isoDataReceived(byte[] data) throws android.os.RemoteException
+    {
+    }
+    @Override public void scoDataReceived(byte[] data) throws android.os.RemoteException
+    {
+    }
+    @Override
+    public android.os.IBinder asBinder() {
+      return null;
+    }
+  }
+  /** Local-side IPC implementation stub class. */
+  public static abstract class Stub extends android.os.Binder implements android.hardware.bluetooth.IBluetoothHciCallbacks
+  {
+    /** Construct the stub at attach it to the interface. */
+    public Stub()
+    {
+      //this.markVintfStability();
+      try {
+        Method method = this.getClass().getMethod("markVintfStability", (Class<?>[])null);
+        method.invoke(this);
+      } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
+        throw new RuntimeException(e);
+      }
+      this.attachInterface(this, DESCRIPTOR);
+    }
+    /**
+     * Cast an IBinder object into an android.hardware.bluetooth.IBluetoothHciCallbacks interface,
+     * generating a proxy if needed.
+     */
+    public static android.hardware.bluetooth.IBluetoothHciCallbacks asInterface(android.os.IBinder obj)
+    {
+      if ((obj==null)) {
+        return null;
+      }
+      android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR);
+      if (((iin!=null)&&(iin instanceof android.hardware.bluetooth.IBluetoothHciCallbacks))) {
+        return ((android.hardware.bluetooth.IBluetoothHciCallbacks)iin);
+      }
+      return new android.hardware.bluetooth.IBluetoothHciCallbacks.Stub.Proxy(obj);
+    }
+    @Override public android.os.IBinder asBinder()
+    {
+      return this;
+    }
+    @Override public boolean onTransact(int code, android.os.Parcel data, android.os.Parcel reply, int flags) throws android.os.RemoteException
+    {
+      java.lang.String descriptor = DESCRIPTOR;
+      if (code >= android.os.IBinder.FIRST_CALL_TRANSACTION && code <= android.os.IBinder.LAST_CALL_TRANSACTION) {
+        data.enforceInterface(descriptor);
+      }
+      switch (code)
+      {
+        case INTERFACE_TRANSACTION:
+        {
+          reply.writeString(descriptor);
+          return true;
+        }
+      }
+      switch (code)
+      {
+        case TRANSACTION_aclDataReceived:
+        {
+          byte[] _arg0;
+          _arg0 = data.createByteArray();
+          this.aclDataReceived(_arg0);
+          reply.writeNoException();
+          break;
+        }
+        case TRANSACTION_hciEventReceived:
+        {
+          byte[] _arg0;
+          _arg0 = data.createByteArray();
+          this.hciEventReceived(_arg0);
+          reply.writeNoException();
+          break;
+        }
+        case TRANSACTION_initializationComplete:
+        {
+          int _arg0;
+          _arg0 = data.readInt();
+          this.initializationComplete(_arg0);
+          reply.writeNoException();
+          break;
+        }
+        case TRANSACTION_isoDataReceived:
+        {
+          byte[] _arg0;
+          _arg0 = data.createByteArray();
+          this.isoDataReceived(_arg0);
+          reply.writeNoException();
+          break;
+        }
+        case TRANSACTION_scoDataReceived:
+        {
+          byte[] _arg0;
+          _arg0 = data.createByteArray();
+          this.scoDataReceived(_arg0);
+          reply.writeNoException();
+          break;
+        }
+        default:
+        {
+          return super.onTransact(code, data, reply, flags);
+        }
+      }
+      return true;
+    }
+    private static class Proxy implements android.hardware.bluetooth.IBluetoothHciCallbacks
+    {
+      private android.os.IBinder mRemote;
+      Proxy(android.os.IBinder remote)
+      {
+        mRemote = remote;
+      }
+      @Override public android.os.IBinder asBinder()
+      {
+        return mRemote;
+      }
+      public java.lang.String getInterfaceDescriptor()
+      {
+        return DESCRIPTOR;
+      }
+      @Override public void aclDataReceived(byte[] data) throws android.os.RemoteException
+      {
+        android.os.Parcel _data = android.os.Parcel.obtain();
+        android.os.Parcel _reply = android.os.Parcel.obtain();
+        try {
+          _data.writeInterfaceToken(DESCRIPTOR);
+          _data.writeByteArray(data);
+          boolean _status = mRemote.transact(Stub.TRANSACTION_aclDataReceived, _data, _reply, 0);
+          _reply.readException();
+        }
+        finally {
+          _reply.recycle();
+          _data.recycle();
+        }
+      }
+      @Override public void hciEventReceived(byte[] event) throws android.os.RemoteException
+      {
+        android.os.Parcel _data = android.os.Parcel.obtain();
+        android.os.Parcel _reply = android.os.Parcel.obtain();
+        try {
+          _data.writeInterfaceToken(DESCRIPTOR);
+          _data.writeByteArray(event);
+          boolean _status = mRemote.transact(Stub.TRANSACTION_hciEventReceived, _data, _reply, 0);
+          _reply.readException();
+        }
+        finally {
+          _reply.recycle();
+          _data.recycle();
+        }
+      }
+      @Override public void initializationComplete(int status) throws android.os.RemoteException
+      {
+        android.os.Parcel _data = android.os.Parcel.obtain();
+        android.os.Parcel _reply = android.os.Parcel.obtain();
+        try {
+          _data.writeInterfaceToken(DESCRIPTOR);
+          _data.writeInt(status);
+          boolean _status = mRemote.transact(Stub.TRANSACTION_initializationComplete, _data, _reply, 0);
+          _reply.readException();
+        }
+        finally {
+          _reply.recycle();
+          _data.recycle();
+        }
+      }
+      @Override public void isoDataReceived(byte[] data) throws android.os.RemoteException
+      {
+        android.os.Parcel _data = android.os.Parcel.obtain();
+        android.os.Parcel _reply = android.os.Parcel.obtain();
+        try {
+          _data.writeInterfaceToken(DESCRIPTOR);
+          _data.writeByteArray(data);
+          boolean _status = mRemote.transact(Stub.TRANSACTION_isoDataReceived, _data, _reply, 0);
+          _reply.readException();
+        }
+        finally {
+          _reply.recycle();
+          _data.recycle();
+        }
+      }
+      @Override public void scoDataReceived(byte[] data) throws android.os.RemoteException
+      {
+        android.os.Parcel _data = android.os.Parcel.obtain();
+        android.os.Parcel _reply = android.os.Parcel.obtain();
+        try {
+          _data.writeInterfaceToken(DESCRIPTOR);
+          _data.writeByteArray(data);
+          boolean _status = mRemote.transact(Stub.TRANSACTION_scoDataReceived, _data, _reply, 0);
+          _reply.readException();
+        }
+        finally {
+          _reply.recycle();
+          _data.recycle();
+        }
+      }
+    }
+    static final int TRANSACTION_aclDataReceived = (android.os.IBinder.FIRST_CALL_TRANSACTION + 0);
+    static final int TRANSACTION_hciEventReceived = (android.os.IBinder.FIRST_CALL_TRANSACTION + 1);
+    static final int TRANSACTION_initializationComplete = (android.os.IBinder.FIRST_CALL_TRANSACTION + 2);
+    static final int TRANSACTION_isoDataReceived = (android.os.IBinder.FIRST_CALL_TRANSACTION + 3);
+    static final int TRANSACTION_scoDataReceived = (android.os.IBinder.FIRST_CALL_TRANSACTION + 4);
+  }
+  public static final java.lang.String DESCRIPTOR = "android$hardware$bluetooth$IBluetoothHciCallbacks".replace('$', '.');
+  public void aclDataReceived(byte[] data) throws android.os.RemoteException;
+  public void hciEventReceived(byte[] event) throws android.os.RemoteException;
+  public void initializationComplete(int status) throws android.os.RemoteException;
+  public void isoDataReceived(byte[] data) throws android.os.RemoteException;
+  public void scoDataReceived(byte[] data) throws android.os.RemoteException;
+}

extras/android/RemoteHCI/app/src/main/java/android/hardware/bluetooth/Status.java

@@ -0,0 +1,11 @@
+/*
+ * This file is auto-generated.  DO NOT MODIFY.
+ */
+package android.hardware.bluetooth;
+public @interface Status {
+  public static final int SUCCESS = 0;
+  public static final int ALREADY_INITIALIZED = 1;
+  public static final int UNABLE_TO_OPEN_INTERFACE = 2;
+  public static final int HARDWARE_INITIALIZATION_ERROR = 3;
+  public static final int UNKNOWN = 4;
+}

extras/android/RemoteHCI/app/src/main/java/android/hardware/bluetooth/V1_0/IBluetoothHci.java

@@ -0,0 +1,816 @@
+package android.hardware.bluetooth.V1_0;
+
+import android.os.HidlSupport;
+import android.os.HwBinder;
+import android.os.IHwBinder;
+import android.os.HwBlob;
+import android.os.HwParcel;
+import android.os.IHwInterface;
+import android.os.NativeHandle;
+
+/**
+ * The Host Controller Interface (HCI) is the layer defined by the Bluetooth
+ * specification between the software that runs on the host and the Bluetooth
+ * controller chip. This boundary is the natural choice for a Hardware
+ * Abstraction Layer (HAL). Dealing only in HCI packets and events simplifies
+ * the stack and abstracts away power management, initialization, and other
+ * implementation-specific details related to the hardware.
+ */
+public interface IBluetoothHci extends android.internal.hidl.base.V1_0.IBase {
+    /**
+     * Fully-qualified interface name for this interface.
+     */
+    public static final String kInterfaceName = "android.hardware.bluetooth@1.0::IBluetoothHci";
+
+    /**
+     * Does a checked conversion from a binder to this class.
+     */
+    /* package private */ static IBluetoothHci asInterface(IHwBinder binder) {
+        if (binder == null) {
+            return null;
+        }
+
+        IHwInterface iface =
+                binder.queryLocalInterface(kInterfaceName);
+
+        if ((iface != null) && (iface instanceof IBluetoothHci)) {
+            return (IBluetoothHci)iface;
+        }
+
+        IBluetoothHci proxy = new IBluetoothHci.Proxy(binder);
+
+        try {
+            for (String descriptor : proxy.interfaceChain()) {
+                if (descriptor.equals(kInterfaceName)) {
+                    return proxy;
+                }
+            }
+        } catch (android.os.RemoteException e) {
+        }
+
+        return null;
+    }
+
+    /**
+     * Does a checked conversion from any interface to this class.
+     */
+    public static IBluetoothHci castFrom(IHwInterface iface) {
+        return (iface == null) ? null : IBluetoothHci.asInterface(iface.asBinder());
+    }
+
+    @Override
+    public IHwBinder asBinder();
+
+    /**
+     * This will invoke the equivalent of the C++ getService(std::string) if retry is
+     * true or tryGetService(std::string) if retry is false. If the service is
+     * available on the device and retry is true, this will wait for the service to
+     * start.
+     *
+     */
+    public static IBluetoothHci getService(String serviceName, boolean retry) throws android.os.RemoteException {
+        return IBluetoothHci.asInterface(HwBinder.getService("android.hardware.bluetooth@1.0::IBluetoothHci", serviceName, retry));
+    }
+
+    /**
+     * Calls getService("default",retry).
+     */
+    public static IBluetoothHci getService(boolean retry) throws android.os.RemoteException {
+        return getService("default", retry);
+    }
+
+    /**
+     * @deprecated this will not wait for the interface to come up if it hasn't yet
+     * started. See getService(String,boolean) instead.
+     */
+    @Deprecated
+    public static IBluetoothHci getService(String serviceName) throws android.os.RemoteException {
+        return IBluetoothHci.asInterface(HwBinder.getService("android.hardware.bluetooth@1.0::IBluetoothHci", serviceName));
+    }
+
+    /**
+     * @deprecated this will not wait for the interface to come up if it hasn't yet
+     * started. See getService(boolean) instead.
+     */
+    @Deprecated
+    public static IBluetoothHci getService() throws android.os.RemoteException {
+        return getService("default");
+    }
+
+    /**
+     * Initialize the underlying HCI interface.
+     *
+     * This method should be used to initialize any hardware interfaces
+     * required to communicate with the Bluetooth hardware in the
+     * device.
+     *
+     * The |oninitializationComplete| callback must be invoked in response
+     * to this function to indicate success before any other function
+     * (sendHciCommand, sendAclData, * sendScoData) is invoked on this
+     * interface.
+     *
+     * @param callback implements IBluetoothHciCallbacks which will
+     *    receive callbacks when incoming HCI packets are received
+     *    from the controller to be sent to the host.
+     */
+    void initialize(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks callback)
+        throws android.os.RemoteException;
+    /**
+     * Send an HCI command (as specified in the Bluetooth Specification
+     * V4.2, Vol 2, Part 5, Section 5.4.1) to the Bluetooth controller.
+     * Commands must be executed in order.
+     *
+     * @param command is the HCI command to be sent
+     */
+    void sendHciCommand(java.util.ArrayList<Byte> command)
+        throws android.os.RemoteException;
+    /**
+     * Send an HCI ACL data packet (as specified in the Bluetooth Specification
+     * V4.2, Vol 2, Part 5, Section 5.4.2) to the Bluetooth controller.
+     * Packets must be processed in order.
+     * @param data HCI data packet to be sent
+     */
+    void sendAclData(java.util.ArrayList<Byte> data)
+        throws android.os.RemoteException;
+    /**
+     * Send an SCO data packet (as specified in the Bluetooth Specification
+     * V4.2, Vol 2, Part 5, Section 5.4.3) to the Bluetooth controller.
+     * Packets must be processed in order.
+     * @param data HCI data packet to be sent
+     */
+    void sendScoData(java.util.ArrayList<Byte> data)
+        throws android.os.RemoteException;
+    /**
+     * Close the HCI interface
+     */
+    void close()
+        throws android.os.RemoteException;
+    /*
+     * Provides run-time type information for this object.
+     * For example, for the following interface definition:
+     *     package android.hardware.foo@1.0;
+     *     interface IParent {};
+     *     interface IChild extends IParent {};
+     * Calling interfaceChain on an IChild object must yield the following:
+     *     ["android.hardware.foo@1.0::IChild",
+     *      "android.hardware.foo@1.0::IParent"
+     *      "android.internal.hidl.base@1.0::IBase"]
+     *
+     * @return descriptors a vector of descriptors of the run-time type of the
+     *         object.
+     */
+    java.util.ArrayList<String> interfaceChain()
+        throws android.os.RemoteException;
+    /*
+     * Emit diagnostic information to the given file.
+     *
+     * Optionally overriden.
+     *
+     * @param fd      File descriptor to dump data to.
+     *                Must only be used for the duration of this call.
+     * @param options Arguments for debugging.
+     *                Must support empty for default debug information.
+     */
+    void debug(NativeHandle fd, java.util.ArrayList<String> options)
+        throws android.os.RemoteException;
+    /*
+     * Provides run-time type information for this object.
+     * For example, for the following interface definition:
+     *     package android.hardware.foo@1.0;
+     *     interface IParent {};
+     *     interface IChild extends IParent {};
+     * Calling interfaceDescriptor on an IChild object must yield
+     *     "android.hardware.foo@1.0::IChild"
+     *
+     * @return descriptor a descriptor of the run-time type of the
+     *         object (the first element of the vector returned by
+     *         interfaceChain())
+     */
+    String interfaceDescriptor()
+        throws android.os.RemoteException;
+    /*
+     * Returns hashes of the source HAL files that define the interfaces of the
+     * runtime type information on the object.
+     * For example, for the following interface definition:
+     *     package android.hardware.foo@1.0;
+     *     interface IParent {};
+     *     interface IChild extends IParent {};
+     * Calling interfaceChain on an IChild object must yield the following:
+     *     [(hash of IChild.hal),
+     *      (hash of IParent.hal)
+     *      (hash of IBase.hal)].
+     *
+     * SHA-256 is used as the hashing algorithm. Each hash has 32 bytes
+     * according to SHA-256 standard.
+     *
+     * @return hashchain a vector of SHA-1 digests
+     */
+    java.util.ArrayList<byte[/* 32 */]> getHashChain()
+        throws android.os.RemoteException;
+    /*
+     * This method trigger the interface to enable/disable instrumentation based
+     * on system property hal.instrumentation.enable.
+     */
+    void setHALInstrumentation()
+        throws android.os.RemoteException;
+    /*
+     * Registers a death recipient, to be called when the process hosting this
+     * interface dies.
+     *
+     * @param recipient a hidl_death_recipient callback object
+     * @param cookie a cookie that must be returned with the callback
+     * @return success whether the death recipient was registered successfully.
+     */
+    boolean linkToDeath(IHwBinder.DeathRecipient recipient, long cookie)
+        throws android.os.RemoteException;
+    /*
+     * Provides way to determine if interface is running without requesting
+     * any functionality.
+     */
+    void ping()
+        throws android.os.RemoteException;
+    /*
+     * Get debug information on references on this interface.
+     * @return info debugging information. See comments of DebugInfo.
+     */
+    android.internal.hidl.base.V1_0.DebugInfo getDebugInfo()
+        throws android.os.RemoteException;
+    /*
+     * This method notifies the interface that one or more system properties
+     * have changed. The default implementation calls
+     * (C++)  report_sysprop_change() in libcutils or
+     * (Java) android.os.SystemProperties.reportSyspropChanged,
+     * which in turn calls a set of registered callbacks (eg to update trace
+     * tags).
+     */
+    void notifySyspropsChanged()
+        throws android.os.RemoteException;
+    /*
+     * Unregisters the registered death recipient. If this service was registered
+     * multiple times with the same exact death recipient, this unlinks the most
+     * recently registered one.
+     *
+     * @param recipient a previously registered hidl_death_recipient callback
+     * @return success whether the death recipient was unregistered successfully.
+     */
+    boolean unlinkToDeath(IHwBinder.DeathRecipient recipient)
+        throws android.os.RemoteException;
+
+    public static final class Proxy implements IBluetoothHci {
+        private IHwBinder mRemote;
+
+        public Proxy(IHwBinder remote) {
+            mRemote = java.util.Objects.requireNonNull(remote);
+        }
+
+        @Override
+        public IHwBinder asBinder() {
+            return mRemote;
+        }
+
+        @Override
+        public String toString() {
+            try {
+                return this.interfaceDescriptor() + "@Proxy";
+            } catch (android.os.RemoteException ex) {
+                /* ignored; handled below. */
+            }
+            return "[class or subclass of " + IBluetoothHci.kInterfaceName + "]@Proxy";
+        }
+
+        @Override
+        public final boolean equals(java.lang.Object other) {
+            return HidlSupport.interfacesEqual(this, other);
+        }
+
+        @Override
+        public final int hashCode() {
+            return this.asBinder().hashCode();
+        }
+
+        // Methods from ::android::hardware::bluetooth::V1_0::IBluetoothHci follow.
+        @Override
+        public void initialize(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks callback)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+            _hidl_request.writeStrongBinder(callback == null ? null : callback.asBinder());
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(1 /* initialize */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void sendHciCommand(java.util.ArrayList<Byte> command)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+            _hidl_request.writeInt8Vector(command);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(2 /* sendHciCommand */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void sendAclData(java.util.ArrayList<Byte> data)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+            _hidl_request.writeInt8Vector(data);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(3 /* sendAclData */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void sendScoData(java.util.ArrayList<Byte> data)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+            _hidl_request.writeInt8Vector(data);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(4 /* sendScoData */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void close()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(5 /* close */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        // Methods from ::android::hidl::base::V1_0::IBase follow.
+        @Override
+        public java.util.ArrayList<String> interfaceChain()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256067662 /* interfaceChain */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                java.util.ArrayList<String> _hidl_out_descriptors = _hidl_reply.readStringVector();
+                return _hidl_out_descriptors;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void debug(NativeHandle fd, java.util.ArrayList<String> options)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+            _hidl_request.writeNativeHandle(fd);
+            _hidl_request.writeStringVector(options);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256131655 /* debug */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public String interfaceDescriptor()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256136003 /* interfaceDescriptor */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                String _hidl_out_descriptor = _hidl_reply.readString();
+                return _hidl_out_descriptor;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public java.util.ArrayList<byte[/* 32 */]> getHashChain()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256398152 /* getHashChain */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                java.util.ArrayList<byte[/* 32 */]> _hidl_out_hashchain =  new java.util.ArrayList<byte[/* 32 */]>();
+                {
+                    HwBlob _hidl_blob = _hidl_reply.readBuffer(16 /* size */);
+                    {
+                        int _hidl_vec_size = _hidl_blob.getInt32(0 /* offset */ + 8 /* offsetof(hidl_vec<T>, mSize) */);
+                        HwBlob childBlob = _hidl_reply.readEmbeddedBuffer(
+                                _hidl_vec_size * 32,_hidl_blob.handle(),
+                                0 /* offset */ + 0 /* offsetof(hidl_vec<T>, mBuffer) */,true /* nullable */);
+
+                        ((java.util.ArrayList<byte[/* 32 */]>) _hidl_out_hashchain).clear();
+                        for (int _hidl_index_0 = 0; _hidl_index_0 < _hidl_vec_size; ++_hidl_index_0) {
+                            byte[/* 32 */] _hidl_vec_element = new byte[32];
+                            {
+                                long _hidl_array_offset_1 = _hidl_index_0 * 32;
+                                childBlob.copyToInt8Array(_hidl_array_offset_1, (byte[/* 32 */]) _hidl_vec_element, 32 /* size */);
+                                _hidl_array_offset_1 += 32 * 1;
+                            }
+                            ((java.util.ArrayList<byte[/* 32 */]>) _hidl_out_hashchain).add(_hidl_vec_element);
+                        }
+                    }
+                }
+                return _hidl_out_hashchain;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void setHALInstrumentation()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256462420 /* setHALInstrumentation */, _hidl_request, _hidl_reply, 1 /* oneway */);
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public boolean linkToDeath(IHwBinder.DeathRecipient recipient, long cookie)
+                throws android.os.RemoteException {
+            return mRemote.linkToDeath(recipient, cookie);
+        }
+        @Override
+        public void ping()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256921159 /* ping */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public android.internal.hidl.base.V1_0.DebugInfo getDebugInfo()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(257049926 /* getDebugInfo */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                android.internal.hidl.base.V1_0.DebugInfo _hidl_out_info = new android.internal.hidl.base.V1_0.DebugInfo();
+                ((android.internal.hidl.base.V1_0.DebugInfo) _hidl_out_info).readFromParcel(_hidl_reply);
+                return _hidl_out_info;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void notifySyspropsChanged()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(257120595 /* notifySyspropsChanged */, _hidl_request, _hidl_reply, 1 /* oneway */);
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public boolean unlinkToDeath(IHwBinder.DeathRecipient recipient)
+                throws android.os.RemoteException {
+            return mRemote.unlinkToDeath(recipient);
+        }
+    }
+
+    public static abstract class Stub extends HwBinder implements IBluetoothHci {
+        @Override
+        public IHwBinder asBinder() {
+            return this;
+        }
+
+        @Override
+        public final java.util.ArrayList<String> interfaceChain() {
+            return new java.util.ArrayList<String>(java.util.Arrays.asList(
+                    android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName,
+                    android.internal.hidl.base.V1_0.IBase.kInterfaceName));
+
+        }
+
+        @Override
+        public void debug(NativeHandle fd, java.util.ArrayList<String> options) {
+            return;
+
+        }
+
+        @Override
+        public final String interfaceDescriptor() {
+            return android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName;
+
+        }
+
+        @Override
+        public final java.util.ArrayList<byte[/* 32 */]> getHashChain() {
+            return new java.util.ArrayList<byte[/* 32 */]>(java.util.Arrays.asList(
+                    new byte[/* 32 */]{52,124,-25,70,-127,86,7,86,127,95,59,83,-28,-128,9,-104,-54,90,-71,53,81,65,-16,-120,15,-64,-49,12,31,-59,-61,85} /* 347ce746815607567f5f3b53e4800998ca5ab9355141f0880fc0cf0c1fc5c355 */,
+                    new byte[/* 32 */]{-20,127,-41,-98,-48,45,-6,-123,-68,73,-108,38,-83,-82,62,-66,35,-17,5,36,-13,-51,105,87,19,-109,36,-72,59,24,-54,76} /* ec7fd79ed02dfa85bc499426adae3ebe23ef0524f3cd6957139324b83b18ca4c */));
+
+        }
+
+        @Override
+        public final void setHALInstrumentation() {
+
+        }
+
+        @Override
+        public final boolean linkToDeath(IHwBinder.DeathRecipient recipient, long cookie) {
+            return true;
+
+        }
+
+        @Override
+        public final void ping() {
+            return;
+
+        }
+
+        @Override
+        public final android.internal.hidl.base.V1_0.DebugInfo getDebugInfo() {
+            android.internal.hidl.base.V1_0.DebugInfo info = new android.internal.hidl.base.V1_0.DebugInfo();
+            info.pid = HidlSupport.getPidIfSharable();
+            info.ptr = 0;
+            info.arch = android.internal.hidl.base.V1_0.DebugInfo.Architecture.UNKNOWN;
+            return info;
+
+        }
+
+        @Override
+        public final void notifySyspropsChanged() {
+            HwBinder.enableInstrumentation();
+
+        }
+
+        @Override
+        public final boolean unlinkToDeath(IHwBinder.DeathRecipient recipient) {
+            return true;
+
+        }
+
+        @Override
+        public IHwInterface queryLocalInterface(String descriptor) {
+            if (kInterfaceName.equals(descriptor)) {
+                return this;
+            }
+            return null;
+        }
+
+        public void registerAsService(String serviceName) throws android.os.RemoteException {
+            registerService(serviceName);
+        }
+
+        @Override
+        public String toString() {
+            return this.interfaceDescriptor() + "@Stub";
+        }
+
+        //@Override
+        public void onTransact(int _hidl_code, HwParcel _hidl_request, final HwParcel _hidl_reply, int _hidl_flags)
+                throws android.os.RemoteException {
+            switch (_hidl_code) {
+                case 1 /* initialize */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+
+                    android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks callback = android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.asInterface(_hidl_request.readStrongBinder());
+                    initialize(callback);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 2 /* sendHciCommand */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+
+                    java.util.ArrayList<Byte> command = _hidl_request.readInt8Vector();
+                    sendHciCommand(command);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 3 /* sendAclData */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+
+                    java.util.ArrayList<Byte> data = _hidl_request.readInt8Vector();
+                    sendAclData(data);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 4 /* sendScoData */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+
+                    java.util.ArrayList<Byte> data = _hidl_request.readInt8Vector();
+                    sendScoData(data);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 5 /* close */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+
+                    close();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256067662 /* interfaceChain */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    java.util.ArrayList<String> _hidl_out_descriptors = interfaceChain();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.writeStringVector(_hidl_out_descriptors);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256131655 /* debug */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    NativeHandle fd = _hidl_request.readNativeHandle();
+                    java.util.ArrayList<String> options = _hidl_request.readStringVector();
+                    debug(fd, options);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256136003 /* interfaceDescriptor */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    String _hidl_out_descriptor = interfaceDescriptor();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.writeString(_hidl_out_descriptor);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256398152 /* getHashChain */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    java.util.ArrayList<byte[/* 32 */]> _hidl_out_hashchain = getHashChain();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    {
+                        HwBlob _hidl_blob = new HwBlob(16 /* size */);
+                        {
+                            int _hidl_vec_size = _hidl_out_hashchain.size();
+                            _hidl_blob.putInt32(0 /* offset */ + 8 /* offsetof(hidl_vec<T>, mSize) */, _hidl_vec_size);
+                            _hidl_blob.putBool(0 /* offset */ + 12 /* offsetof(hidl_vec<T>, mOwnsBuffer) */, false);
+                            HwBlob childBlob = new HwBlob((int)(_hidl_vec_size * 32));
+                            for (int _hidl_index_0 = 0; _hidl_index_0 < _hidl_vec_size; ++_hidl_index_0) {
+                                {
+                                    long _hidl_array_offset_1 = _hidl_index_0 * 32;
+                                    byte[] _hidl_array_item_1 = (byte[/* 32 */]) _hidl_out_hashchain.get(_hidl_index_0);
+
+                                    if (_hidl_array_item_1 == null || _hidl_array_item_1.length != 32) {
+                                        throw new IllegalArgumentException("Array element is not of the expected length");
+                                    }
+
+                                    childBlob.putInt8Array(_hidl_array_offset_1, _hidl_array_item_1);
+                                    _hidl_array_offset_1 += 32 * 1;
+                                }
+                            }
+                            _hidl_blob.putBlob(0 /* offset */ + 0 /* offsetof(hidl_vec<T>, mBuffer) */, childBlob);
+                        }
+                        _hidl_reply.writeBuffer(_hidl_blob);
+                    }
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256462420 /* setHALInstrumentation */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    setHALInstrumentation();
+                    break;
+                }
+
+                case 256660548 /* linkToDeath */:
+                {
+                break;
+                }
+
+                case 256921159 /* ping */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    ping();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 257049926 /* getDebugInfo */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    android.internal.hidl.base.V1_0.DebugInfo _hidl_out_info = getDebugInfo();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    ((android.internal.hidl.base.V1_0.DebugInfo) _hidl_out_info).writeToParcel(_hidl_reply);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 257120595 /* notifySyspropsChanged */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    notifySyspropsChanged();
+                    break;
+                }
+
+                case 257250372 /* unlinkToDeath */:
+                {
+                break;
+                }
+
+            }
+        }
+    }
+}

extras/android/RemoteHCI/app/src/main/java/android/hardware/bluetooth/V1_0/IBluetoothHciCallbacks.java

@@ -0,0 +1,762 @@
+package android.hardware.bluetooth.V1_0;
+
+import android.os.HidlSupport;
+import android.os.HwBinder;
+import android.os.IHwBinder;
+import android.os.HwBlob;
+import android.os.HwParcel;
+import android.os.IHwInterface;
+import android.os.NativeHandle;
+
+/**
+ * The interface from the Bluetooth Controller to the stack.
+ */
+public interface IBluetoothHciCallbacks extends android.internal.hidl.base.V1_0.IBase {
+    /**
+     * Fully-qualified interface name for this interface.
+     */
+    public static final String kInterfaceName = "android.hardware.bluetooth@1.0::IBluetoothHciCallbacks";
+
+    /**
+     * Does a checked conversion from a binder to this class.
+     */
+    /* package private */ static IBluetoothHciCallbacks asInterface(IHwBinder binder) {
+        if (binder == null) {
+            return null;
+        }
+
+        IHwInterface iface =
+                binder.queryLocalInterface(kInterfaceName);
+
+        if ((iface != null) && (iface instanceof IBluetoothHciCallbacks)) {
+            return (IBluetoothHciCallbacks)iface;
+        }
+
+        IBluetoothHciCallbacks proxy = new IBluetoothHciCallbacks.Proxy(binder);
+
+        try {
+            for (String descriptor : proxy.interfaceChain()) {
+                if (descriptor.equals(kInterfaceName)) {
+                    return proxy;
+                }
+            }
+        } catch (android.os.RemoteException e) {
+        }
+
+        return null;
+    }
+
+    /**
+     * Does a checked conversion from any interface to this class.
+     */
+    public static IBluetoothHciCallbacks castFrom(IHwInterface iface) {
+        return (iface == null) ? null : IBluetoothHciCallbacks.asInterface(iface.asBinder());
+    }
+
+    @Override
+    public IHwBinder asBinder();
+
+    /**
+     * This will invoke the equivalent of the C++ getService(std::string) if retry is
+     * true or tryGetService(std::string) if retry is false. If the service is
+     * available on the device and retry is true, this will wait for the service to
+     * start.
+     *
+     */
+    public static IBluetoothHciCallbacks getService(String serviceName, boolean retry) throws android.os.RemoteException {
+        return IBluetoothHciCallbacks.asInterface(HwBinder.getService("android.hardware.bluetooth@1.0::IBluetoothHciCallbacks", serviceName, retry));
+    }
+
+    /**
+     * Calls getService("default",retry).
+     */
+    public static IBluetoothHciCallbacks getService(boolean retry) throws android.os.RemoteException {
+        return getService("default", retry);
+    }
+
+    /**
+     * @deprecated this will not wait for the interface to come up if it hasn't yet
+     * started. See getService(String,boolean) instead.
+     */
+    @Deprecated
+    public static IBluetoothHciCallbacks getService(String serviceName) throws android.os.RemoteException {
+        return IBluetoothHciCallbacks.asInterface(HwBinder.getService("android.hardware.bluetooth@1.0::IBluetoothHciCallbacks", serviceName));
+    }
+
+    /**
+     * @deprecated this will not wait for the interface to come up if it hasn't yet
+     * started. See getService(boolean) instead.
+     */
+    @Deprecated
+    public static IBluetoothHciCallbacks getService() throws android.os.RemoteException {
+        return getService("default");
+    }
+
+    /**
+     * Invoked when the Bluetooth controller initialization has been
+     * completed.
+     */
+    void initializationComplete(int status)
+        throws android.os.RemoteException;
+    /**
+     * This function is invoked when an HCI event is received from the
+     * Bluetooth controller to be forwarded to the Bluetooth stack.
+     * @param event is the HCI event to be sent to the Bluetooth stack.
+     */
+    void hciEventReceived(java.util.ArrayList<Byte> event)
+        throws android.os.RemoteException;
+    /**
+     * Send an ACL data packet form the controller to the host.
+     * @param data the ACL HCI packet to be passed to the host stack
+     */
+    void aclDataReceived(java.util.ArrayList<Byte> data)
+        throws android.os.RemoteException;
+    /**
+     * Send a SCO data packet form the controller to the host.
+     * @param data the SCO HCI packet to be passed to the host stack
+     */
+    void scoDataReceived(java.util.ArrayList<Byte> data)
+        throws android.os.RemoteException;
+    /*
+     * Provides run-time type information for this object.
+     * For example, for the following interface definition:
+     *     package android.hardware.foo@1.0;
+     *     interface IParent {};
+     *     interface IChild extends IParent {};
+     * Calling interfaceChain on an IChild object must yield the following:
+     *     ["android.hardware.foo@1.0::IChild",
+     *      "android.hardware.foo@1.0::IParent"
+     *      "android.internal.hidl.base@1.0::IBase"]
+     *
+     * @return descriptors a vector of descriptors of the run-time type of the
+     *         object.
+     */
+    java.util.ArrayList<String> interfaceChain()
+        throws android.os.RemoteException;
+    /*
+     * Emit diagnostic information to the given file.
+     *
+     * Optionally overriden.
+     *
+     * @param fd      File descriptor to dump data to.
+     *                Must only be used for the duration of this call.
+     * @param options Arguments for debugging.
+     *                Must support empty for default debug information.
+     */
+    void debug(NativeHandle fd, java.util.ArrayList<String> options)
+        throws android.os.RemoteException;
+    /*
+     * Provides run-time type information for this object.
+     * For example, for the following interface definition:
+     *     package android.hardware.foo@1.0;
+     *     interface IParent {};
+     *     interface IChild extends IParent {};
+     * Calling interfaceDescriptor on an IChild object must yield
+     *     "android.hardware.foo@1.0::IChild"
+     *
+     * @return descriptor a descriptor of the run-time type of the
+     *         object (the first element of the vector returned by
+     *         interfaceChain())
+     */
+    String interfaceDescriptor()
+        throws android.os.RemoteException;
+    /*
+     * Returns hashes of the source HAL files that define the interfaces of the
+     * runtime type information on the object.
+     * For example, for the following interface definition:
+     *     package android.hardware.foo@1.0;
+     *     interface IParent {};
+     *     interface IChild extends IParent {};
+     * Calling interfaceChain on an IChild object must yield the following:
+     *     [(hash of IChild.hal),
+     *      (hash of IParent.hal)
+     *      (hash of IBase.hal)].
+     *
+     * SHA-256 is used as the hashing algorithm. Each hash has 32 bytes
+     * according to SHA-256 standard.
+     *
+     * @return hashchain a vector of SHA-1 digests
+     */
+    java.util.ArrayList<byte[/* 32 */]> getHashChain()
+        throws android.os.RemoteException;
+    /*
+     * This method trigger the interface to enable/disable instrumentation based
+     * on system property hal.instrumentation.enable.
+     */
+    void setHALInstrumentation()
+        throws android.os.RemoteException;
+    /*
+     * Registers a death recipient, to be called when the process hosting this
+     * interface dies.
+     *
+     * @param recipient a hidl_death_recipient callback object
+     * @param cookie a cookie that must be returned with the callback
+     * @return success whether the death recipient was registered successfully.
+     */
+    boolean linkToDeath(IHwBinder.DeathRecipient recipient, long cookie)
+        throws android.os.RemoteException;
+    /*
+     * Provides way to determine if interface is running without requesting
+     * any functionality.
+     */
+    void ping()
+        throws android.os.RemoteException;
+    /*
+     * Get debug information on references on this interface.
+     * @return info debugging information. See comments of DebugInfo.
+     */
+    android.internal.hidl.base.V1_0.DebugInfo getDebugInfo()
+        throws android.os.RemoteException;
+    /*
+     * This method notifies the interface that one or more system properties
+     * have changed. The default implementation calls
+     * (C++)  report_sysprop_change() in libcutils or
+     * (Java) android.os.SystemProperties.reportSyspropChanged,
+     * which in turn calls a set of registered callbacks (eg to update trace
+     * tags).
+     */
+    void notifySyspropsChanged()
+        throws android.os.RemoteException;
+    /*
+     * Unregisters the registered death recipient. If this service was registered
+     * multiple times with the same exact death recipient, this unlinks the most
+     * recently registered one.
+     *
+     * @param recipient a previously registered hidl_death_recipient callback
+     * @return success whether the death recipient was unregistered successfully.
+     */
+    boolean unlinkToDeath(IHwBinder.DeathRecipient recipient)
+        throws android.os.RemoteException;
+
+    public static final class Proxy implements IBluetoothHciCallbacks {
+        private IHwBinder mRemote;
+
+        public Proxy(IHwBinder remote) {
+            mRemote = java.util.Objects.requireNonNull(remote);
+        }
+
+        @Override
+        public IHwBinder asBinder() {
+            return mRemote;
+        }
+
+        @Override
+        public String toString() {
+            try {
+                return this.interfaceDescriptor() + "@Proxy";
+            } catch (android.os.RemoteException ex) {
+                /* ignored; handled below. */
+            }
+            return "[class or subclass of " + IBluetoothHciCallbacks.kInterfaceName + "]@Proxy";
+        }
+
+        @Override
+        public final boolean equals(java.lang.Object other) {
+            return HidlSupport.interfacesEqual(this, other);
+        }
+
+        @Override
+        public final int hashCode() {
+            return this.asBinder().hashCode();
+        }
+
+        // Methods from ::android::hardware::bluetooth::V1_0::IBluetoothHciCallbacks follow.
+        @Override
+        public void initializationComplete(int status)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+            _hidl_request.writeInt32(status);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(1 /* initializationComplete */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void hciEventReceived(java.util.ArrayList<Byte> event)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+            _hidl_request.writeInt8Vector(event);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(2 /* hciEventReceived */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void aclDataReceived(java.util.ArrayList<Byte> data)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+            _hidl_request.writeInt8Vector(data);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(3 /* aclDataReceived */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void scoDataReceived(java.util.ArrayList<Byte> data)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+            _hidl_request.writeInt8Vector(data);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(4 /* scoDataReceived */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        // Methods from ::android::hidl::base::V1_0::IBase follow.
+        @Override
+        public java.util.ArrayList<String> interfaceChain()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256067662 /* interfaceChain */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                java.util.ArrayList<String> _hidl_out_descriptors = _hidl_reply.readStringVector();
+                return _hidl_out_descriptors;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void debug(NativeHandle fd, java.util.ArrayList<String> options)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+            _hidl_request.writeNativeHandle(fd);
+            _hidl_request.writeStringVector(options);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256131655 /* debug */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public String interfaceDescriptor()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256136003 /* interfaceDescriptor */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                String _hidl_out_descriptor = _hidl_reply.readString();
+                return _hidl_out_descriptor;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public java.util.ArrayList<byte[/* 32 */]> getHashChain()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256398152 /* getHashChain */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                java.util.ArrayList<byte[/* 32 */]> _hidl_out_hashchain =  new java.util.ArrayList<byte[/* 32 */]>();
+                {
+                    HwBlob _hidl_blob = _hidl_reply.readBuffer(16 /* size */);
+                    {
+                        int _hidl_vec_size = _hidl_blob.getInt32(0 /* offset */ + 8 /* offsetof(hidl_vec<T>, mSize) */);
+                        HwBlob childBlob = _hidl_reply.readEmbeddedBuffer(
+                                _hidl_vec_size * 32,_hidl_blob.handle(),
+                                0 /* offset */ + 0 /* offsetof(hidl_vec<T>, mBuffer) */,true /* nullable */);
+
+                        ((java.util.ArrayList<byte[/* 32 */]>) _hidl_out_hashchain).clear();
+                        for (int _hidl_index_0 = 0; _hidl_index_0 < _hidl_vec_size; ++_hidl_index_0) {
+                            byte[/* 32 */] _hidl_vec_element = new byte[32];
+                            {
+                                long _hidl_array_offset_1 = _hidl_index_0 * 32;
+                                childBlob.copyToInt8Array(_hidl_array_offset_1, (byte[/* 32 */]) _hidl_vec_element, 32 /* size */);
+                                _hidl_array_offset_1 += 32 * 1;
+                            }
+                            ((java.util.ArrayList<byte[/* 32 */]>) _hidl_out_hashchain).add(_hidl_vec_element);
+                        }
+                    }
+                }
+                return _hidl_out_hashchain;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void setHALInstrumentation()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256462420 /* setHALInstrumentation */, _hidl_request, _hidl_reply, 1 /* oneway */);
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public boolean linkToDeath(IHwBinder.DeathRecipient recipient, long cookie)
+                throws android.os.RemoteException {
+            return mRemote.linkToDeath(recipient, cookie);
+        }
+        @Override
+        public void ping()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256921159 /* ping */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public android.internal.hidl.base.V1_0.DebugInfo getDebugInfo()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(257049926 /* getDebugInfo */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                android.internal.hidl.base.V1_0.DebugInfo _hidl_out_info = new android.internal.hidl.base.V1_0.DebugInfo();
+                ((android.internal.hidl.base.V1_0.DebugInfo) _hidl_out_info).readFromParcel(_hidl_reply);
+                return _hidl_out_info;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void notifySyspropsChanged()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(257120595 /* notifySyspropsChanged */, _hidl_request, _hidl_reply, 1 /* oneway */);
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public boolean unlinkToDeath(IHwBinder.DeathRecipient recipient)
+                throws android.os.RemoteException {
+            return mRemote.unlinkToDeath(recipient);
+        }
+    }
+
+    public static abstract class Stub extends HwBinder implements IBluetoothHciCallbacks {
+        @Override
+        public IHwBinder asBinder() {
+            return this;
+        }
+
+        @Override
+        public final java.util.ArrayList<String> interfaceChain() {
+            return new java.util.ArrayList<String>(java.util.Arrays.asList(
+                    android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName,
+                    android.internal.hidl.base.V1_0.IBase.kInterfaceName));
+
+        }
+
+        @Override
+        public void debug(NativeHandle fd, java.util.ArrayList<String> options) {
+            return;
+
+        }
+
+        @Override
+        public final String interfaceDescriptor() {
+            return android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName;
+
+        }
+
+        @Override
+        public final java.util.ArrayList<byte[/* 32 */]> getHashChain() {
+            return new java.util.ArrayList<byte[/* 32 */]>(java.util.Arrays.asList(
+                    new byte[/* 32 */]{-125,95,65,-66,34,-127,-65,-78,47,62,51,-58,-6,-121,11,-34,123,-62,30,55,-27,-49,-70,-7,-93,111,-1,23,6,50,-9,84} /* 835f41be2281bfb22f3e33c6fa870bde7bc21e37e5cfbaf9a36fff170632f754 */,
+                    new byte[/* 32 */]{-20,127,-41,-98,-48,45,-6,-123,-68,73,-108,38,-83,-82,62,-66,35,-17,5,36,-13,-51,105,87,19,-109,36,-72,59,24,-54,76} /* ec7fd79ed02dfa85bc499426adae3ebe23ef0524f3cd6957139324b83b18ca4c */));
+
+        }
+
+        @Override
+        public final void setHALInstrumentation() {
+
+        }
+
+        @Override
+        public final boolean linkToDeath(IHwBinder.DeathRecipient recipient, long cookie) {
+            return true;
+
+        }
+
+        @Override
+        public final void ping() {
+            return;
+
+        }
+
+        @Override
+        public final android.internal.hidl.base.V1_0.DebugInfo getDebugInfo() {
+            android.internal.hidl.base.V1_0.DebugInfo info = new android.internal.hidl.base.V1_0.DebugInfo();
+            info.pid = HidlSupport.getPidIfSharable();
+            info.ptr = 0;
+            info.arch = android.internal.hidl.base.V1_0.DebugInfo.Architecture.UNKNOWN;
+            return info;
+
+        }
+
+        @Override
+        public final void notifySyspropsChanged() {
+            HwBinder.enableInstrumentation();
+
+        }
+
+        @Override
+        public final boolean unlinkToDeath(IHwBinder.DeathRecipient recipient) {
+            return true;
+
+        }
+
+        @Override
+        public IHwInterface queryLocalInterface(String descriptor) {
+            if (kInterfaceName.equals(descriptor)) {
+                return this;
+            }
+            return null;
+        }
+
+        public void registerAsService(String serviceName) throws android.os.RemoteException {
+            registerService(serviceName);
+        }
+
+        @Override
+        public String toString() {
+            return this.interfaceDescriptor() + "@Stub";
+        }
+
+        //@Override
+        public void onTransact(int _hidl_code, HwParcel _hidl_request, final HwParcel _hidl_reply, int _hidl_flags)
+                throws android.os.RemoteException {
+            switch (_hidl_code) {
+                case 1 /* initializationComplete */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+
+                    int status = _hidl_request.readInt32();
+                    initializationComplete(status);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 2 /* hciEventReceived */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+
+                    java.util.ArrayList<Byte> event = _hidl_request.readInt8Vector();
+                    hciEventReceived(event);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 3 /* aclDataReceived */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+
+                    java.util.ArrayList<Byte> data = _hidl_request.readInt8Vector();
+                    aclDataReceived(data);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 4 /* scoDataReceived */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+
+                    java.util.ArrayList<Byte> data = _hidl_request.readInt8Vector();
+                    scoDataReceived(data);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256067662 /* interfaceChain */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    java.util.ArrayList<String> _hidl_out_descriptors = interfaceChain();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.writeStringVector(_hidl_out_descriptors);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256131655 /* debug */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    NativeHandle fd = _hidl_request.readNativeHandle();
+                    java.util.ArrayList<String> options = _hidl_request.readStringVector();
+                    debug(fd, options);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256136003 /* interfaceDescriptor */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    String _hidl_out_descriptor = interfaceDescriptor();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.writeString(_hidl_out_descriptor);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256398152 /* getHashChain */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    java.util.ArrayList<byte[/* 32 */]> _hidl_out_hashchain = getHashChain();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    {
+                        HwBlob _hidl_blob = new HwBlob(16 /* size */);
+                        {
+                            int _hidl_vec_size = _hidl_out_hashchain.size();
+                            _hidl_blob.putInt32(0 /* offset */ + 8 /* offsetof(hidl_vec<T>, mSize) */, _hidl_vec_size);
+                            _hidl_blob.putBool(0 /* offset */ + 12 /* offsetof(hidl_vec<T>, mOwnsBuffer) */, false);
+                            HwBlob childBlob = new HwBlob((int)(_hidl_vec_size * 32));
+                            for (int _hidl_index_0 = 0; _hidl_index_0 < _hidl_vec_size; ++_hidl_index_0) {
+                                {
+                                    long _hidl_array_offset_1 = _hidl_index_0 * 32;
+                                    byte[] _hidl_array_item_1 = (byte[/* 32 */]) _hidl_out_hashchain.get(_hidl_index_0);
+
+                                    if (_hidl_array_item_1 == null || _hidl_array_item_1.length != 32) {
+                                        throw new IllegalArgumentException("Array element is not of the expected length");
+                                    }
+
+                                    childBlob.putInt8Array(_hidl_array_offset_1, _hidl_array_item_1);
+                                    _hidl_array_offset_1 += 32 * 1;
+                                }
+                            }
+                            _hidl_blob.putBlob(0 /* offset */ + 0 /* offsetof(hidl_vec<T>, mBuffer) */, childBlob);
+                        }
+                        _hidl_reply.writeBuffer(_hidl_blob);
+                    }
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256462420 /* setHALInstrumentation */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    setHALInstrumentation();
+                    break;
+                }
+
+                case 256660548 /* linkToDeath */:
+                {
+                break;
+                }
+
+                case 256921159 /* ping */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    ping();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 257049926 /* getDebugInfo */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    android.internal.hidl.base.V1_0.DebugInfo _hidl_out_info = getDebugInfo();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    ((android.internal.hidl.base.V1_0.DebugInfo) _hidl_out_info).writeToParcel(_hidl_reply);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 257120595 /* notifySyspropsChanged */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    notifySyspropsChanged();
+                    break;
+                }
+
+                case 257250372 /* unlinkToDeath */:
+                {
+                break;
+                }
+
+            }
+        }
+    }
+}

extras/android/RemoteHCI/app/src/main/java/android/hardware/bluetooth/V1_0/Status.java

@@ -0,0 +1,48 @@
+package android.hardware.bluetooth.V1_0;
+
+
+public final class Status {
+    public static final int SUCCESS = 0;
+    public static final int TRANSPORT_ERROR = 1 /* ::android::hardware::bluetooth::V1_0::Status.SUCCESS implicitly + 1 */;
+    public static final int INITIALIZATION_ERROR = 2 /* ::android::hardware::bluetooth::V1_0::Status.TRANSPORT_ERROR implicitly + 1 */;
+    public static final int UNKNOWN = 3 /* ::android::hardware::bluetooth::V1_0::Status.INITIALIZATION_ERROR implicitly + 1 */;
+    public static final String toString(int o) {
+        if (o == SUCCESS) {
+            return "SUCCESS";
+        }
+        if (o == TRANSPORT_ERROR) {
+            return "TRANSPORT_ERROR";
+        }
+        if (o == INITIALIZATION_ERROR) {
+            return "INITIALIZATION_ERROR";
+        }
+        if (o == UNKNOWN) {
+            return "UNKNOWN";
+        }
+        return "0x" + Integer.toHexString(o);
+    }
+
+    public static final String dumpBitfield(int o) {
+        java.util.ArrayList<String> list = new java.util.ArrayList<>();
+        int flipped = 0;
+        list.add("SUCCESS"); // SUCCESS == 0
+        if ((o & TRANSPORT_ERROR) == TRANSPORT_ERROR) {
+            list.add("TRANSPORT_ERROR");
+            flipped |= TRANSPORT_ERROR;
+        }
+        if ((o & INITIALIZATION_ERROR) == INITIALIZATION_ERROR) {
+            list.add("INITIALIZATION_ERROR");
+            flipped |= INITIALIZATION_ERROR;
+        }
+        if ((o & UNKNOWN) == UNKNOWN) {
+            list.add("UNKNOWN");
+            flipped |= UNKNOWN;
+        }
+        if (o != flipped) {
+            list.add("0x" + Integer.toHexString(o & (~flipped)));
+        }
+        return String.join(" | ", list);
+    }
+
+};
+

extras/android/RemoteHCI/app/src/main/java/android/hardware/bluetooth/V1_1/IBluetoothHci.java

@@ -0,0 +1,840 @@
+package android.hardware.bluetooth.V1_1;
+
+import android.os.HidlSupport;
+import android.os.HwBinder;
+import android.os.IHwBinder;
+import android.os.HwBlob;
+import android.os.HwParcel;
+import android.os.IHwInterface;
+import android.os.NativeHandle;
+
+/**
+ * The Host Controller Interface (HCI) is the layer defined by the Bluetooth
+ * specification between the software that runs on the host and the Bluetooth
+ * controller chip. This boundary is the natural choice for a Hardware
+ * Abstraction Layer (HAL). Dealing only in HCI packets and events simplifies
+ * the stack and abstracts away power management, initialization, and other
+ * implementation-specific details related to the hardware.
+ */
+public interface IBluetoothHci extends android.hardware.bluetooth.V1_0.IBluetoothHci {
+    /**
+     * Fully-qualified interface name for this interface.
+     */
+    public static final String kInterfaceName = "android.hardware.bluetooth@1.1::IBluetoothHci";
+
+    /**
+     * Does a checked conversion from a binder to this class.
+     */
+    /* package private */ static IBluetoothHci asInterface(IHwBinder binder) {
+        if (binder == null) {
+            return null;
+        }
+
+        IHwInterface iface =
+                binder.queryLocalInterface(kInterfaceName);
+
+        if ((iface != null) && (iface instanceof IBluetoothHci)) {
+            return (IBluetoothHci)iface;
+        }
+
+        IBluetoothHci proxy = new IBluetoothHci.Proxy(binder);
+
+        try {
+            for (String descriptor : proxy.interfaceChain()) {
+                if (descriptor.equals(kInterfaceName)) {
+                    return proxy;
+                }
+            }
+        } catch (android.os.RemoteException e) {
+        }
+
+        return null;
+    }
+
+    /**
+     * Does a checked conversion from any interface to this class.
+     */
+    public static IBluetoothHci castFrom(IHwInterface iface) {
+        return (iface == null) ? null : IBluetoothHci.asInterface(iface.asBinder());
+    }
+
+    @Override
+    public IHwBinder asBinder();
+
+    /**
+     * This will invoke the equivalent of the C++ getService(std::string) if retry is
+     * true or tryGetService(std::string) if retry is false. If the service is
+     * available on the device and retry is true, this will wait for the service to
+     * start.
+     *
+     */
+    public static IBluetoothHci getService(String serviceName, boolean retry) throws android.os.RemoteException {
+        return IBluetoothHci.asInterface(HwBinder.getService("android.hardware.bluetooth@1.1::IBluetoothHci", serviceName, retry));
+    }
+
+    /**
+     * Calls getService("default",retry).
+     */
+    public static IBluetoothHci getService(boolean retry) throws android.os.RemoteException {
+        return getService("default", retry);
+    }
+
+    /**
+     * @deprecated this will not wait for the interface to come up if it hasn't yet
+     * started. See getService(String,boolean) instead.
+     */
+    @Deprecated
+    public static IBluetoothHci getService(String serviceName) throws android.os.RemoteException {
+        return IBluetoothHci.asInterface(HwBinder.getService("android.hardware.bluetooth@1.1::IBluetoothHci", serviceName));
+    }
+
+    /**
+     * @deprecated this will not wait for the interface to come up if it hasn't yet
+     * started. See getService(boolean) instead.
+     */
+    @Deprecated
+    public static IBluetoothHci getService() throws android.os.RemoteException {
+        return getService("default");
+    }
+
+    /**
+     * Same as @1.0, but uses 1.1 Callbacks version
+     */
+    void initialize_1_1(android.hardware.bluetooth.V1_1.IBluetoothHciCallbacks callback)
+        throws android.os.RemoteException;
+    /**
+     * Send an ISO data packet (as specified in the Bluetooth Core
+     * Specification v5.2) to the Bluetooth controller.
+     * Packets must be processed in order.
+     * @param data HCI data packet to be sent
+     */
+    void sendIsoData(java.util.ArrayList<Byte> data)
+        throws android.os.RemoteException;
+    /*
+     * Provides run-time type information for this object.
+     * For example, for the following interface definition:
+     *     package android.hardware.foo@1.0;
+     *     interface IParent {};
+     *     interface IChild extends IParent {};
+     * Calling interfaceChain on an IChild object must yield the following:
+     *     ["android.hardware.foo@1.0::IChild",
+     *      "android.hardware.foo@1.0::IParent"
+     *      "android.internal.hidl.base@1.0::IBase"]
+     *
+     * @return descriptors a vector of descriptors of the run-time type of the
+     *         object.
+     */
+    java.util.ArrayList<String> interfaceChain()
+        throws android.os.RemoteException;
+    /*
+     * Emit diagnostic information to the given file.
+     *
+     * Optionally overriden.
+     *
+     * @param fd      File descriptor to dump data to.
+     *                Must only be used for the duration of this call.
+     * @param options Arguments for debugging.
+     *                Must support empty for default debug information.
+     */
+    void debug(NativeHandle fd, java.util.ArrayList<String> options)
+        throws android.os.RemoteException;
+    /*
+     * Provides run-time type information for this object.
+     * For example, for the following interface definition:
+     *     package android.hardware.foo@1.0;
+     *     interface IParent {};
+     *     interface IChild extends IParent {};
+     * Calling interfaceDescriptor on an IChild object must yield
+     *     "android.hardware.foo@1.0::IChild"
+     *
+     * @return descriptor a descriptor of the run-time type of the
+     *         object (the first element of the vector returned by
+     *         interfaceChain())
+     */
+    String interfaceDescriptor()
+        throws android.os.RemoteException;
+    /*
+     * Returns hashes of the source HAL files that define the interfaces of the
+     * runtime type information on the object.
+     * For example, for the following interface definition:
+     *     package android.hardware.foo@1.0;
+     *     interface IParent {};
+     *     interface IChild extends IParent {};
+     * Calling interfaceChain on an IChild object must yield the following:
+     *     [(hash of IChild.hal),
+     *      (hash of IParent.hal)
+     *      (hash of IBase.hal)].
+     *
+     * SHA-256 is used as the hashing algorithm. Each hash has 32 bytes
+     * according to SHA-256 standard.
+     *
+     * @return hashchain a vector of SHA-1 digests
+     */
+    java.util.ArrayList<byte[/* 32 */]> getHashChain()
+        throws android.os.RemoteException;
+    /*
+     * This method trigger the interface to enable/disable instrumentation based
+     * on system property hal.instrumentation.enable.
+     */
+    void setHALInstrumentation()
+        throws android.os.RemoteException;
+    /*
+     * Registers a death recipient, to be called when the process hosting this
+     * interface dies.
+     *
+     * @param recipient a hidl_death_recipient callback object
+     * @param cookie a cookie that must be returned with the callback
+     * @return success whether the death recipient was registered successfully.
+     */
+    boolean linkToDeath(IHwBinder.DeathRecipient recipient, long cookie)
+        throws android.os.RemoteException;
+    /*
+     * Provides way to determine if interface is running without requesting
+     * any functionality.
+     */
+    void ping()
+        throws android.os.RemoteException;
+    /*
+     * Get debug information on references on this interface.
+     * @return info debugging information. See comments of DebugInfo.
+     */
+    android.internal.hidl.base.V1_0.DebugInfo getDebugInfo()
+        throws android.os.RemoteException;
+    /*
+     * This method notifies the interface that one or more system properties
+     * have changed. The default implementation calls
+     * (C++)  report_sysprop_change() in libcutils or
+     * (Java) android.os.SystemProperties.reportSyspropChanged,
+     * which in turn calls a set of registered callbacks (eg to update trace
+     * tags).
+     */
+    void notifySyspropsChanged()
+        throws android.os.RemoteException;
+    /*
+     * Unregisters the registered death recipient. If this service was registered
+     * multiple times with the same exact death recipient, this unlinks the most
+     * recently registered one.
+     *
+     * @param recipient a previously registered hidl_death_recipient callback
+     * @return success whether the death recipient was unregistered successfully.
+     */
+    boolean unlinkToDeath(IHwBinder.DeathRecipient recipient)
+        throws android.os.RemoteException;
+
+    public static final class Proxy implements IBluetoothHci {
+        private IHwBinder mRemote;
+
+        public Proxy(IHwBinder remote) {
+            mRemote = java.util.Objects.requireNonNull(remote);
+        }
+
+        @Override
+        public IHwBinder asBinder() {
+            return mRemote;
+        }
+
+        @Override
+        public String toString() {
+            try {
+                return this.interfaceDescriptor() + "@Proxy";
+            } catch (android.os.RemoteException ex) {
+                /* ignored; handled below. */
+            }
+            return "[class or subclass of " + IBluetoothHci.kInterfaceName + "]@Proxy";
+        }
+
+        @Override
+        public final boolean equals(java.lang.Object other) {
+            return HidlSupport.interfacesEqual(this, other);
+        }
+
+        @Override
+        public final int hashCode() {
+            return this.asBinder().hashCode();
+        }
+
+        // Methods from ::android::hardware::bluetooth::V1_0::IBluetoothHci follow.
+        @Override
+        public void initialize(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks callback)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+            _hidl_request.writeStrongBinder(callback == null ? null : callback.asBinder());
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(1 /* initialize */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void sendHciCommand(java.util.ArrayList<Byte> command)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+            _hidl_request.writeInt8Vector(command);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(2 /* sendHciCommand */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void sendAclData(java.util.ArrayList<Byte> data)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+            _hidl_request.writeInt8Vector(data);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(3 /* sendAclData */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void sendScoData(java.util.ArrayList<Byte> data)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+            _hidl_request.writeInt8Vector(data);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(4 /* sendScoData */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void close()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(5 /* close */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        // Methods from ::android::hardware::bluetooth::V1_1::IBluetoothHci follow.
+        @Override
+        public void initialize_1_1(android.hardware.bluetooth.V1_1.IBluetoothHciCallbacks callback)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_1.IBluetoothHci.kInterfaceName);
+            _hidl_request.writeStrongBinder(callback == null ? null : callback.asBinder());
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(6 /* initialize_1_1 */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void sendIsoData(java.util.ArrayList<Byte> data)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_1.IBluetoothHci.kInterfaceName);
+            _hidl_request.writeInt8Vector(data);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(7 /* sendIsoData */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        // Methods from ::android::hidl::base::V1_0::IBase follow.
+        @Override
+        public java.util.ArrayList<String> interfaceChain()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256067662 /* interfaceChain */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                java.util.ArrayList<String> _hidl_out_descriptors = _hidl_reply.readStringVector();
+                return _hidl_out_descriptors;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void debug(NativeHandle fd, java.util.ArrayList<String> options)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+            _hidl_request.writeNativeHandle(fd);
+            _hidl_request.writeStringVector(options);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256131655 /* debug */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public String interfaceDescriptor()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256136003 /* interfaceDescriptor */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                String _hidl_out_descriptor = _hidl_reply.readString();
+                return _hidl_out_descriptor;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public java.util.ArrayList<byte[/* 32 */]> getHashChain()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256398152 /* getHashChain */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                java.util.ArrayList<byte[/* 32 */]> _hidl_out_hashchain =  new java.util.ArrayList<byte[/* 32 */]>();
+                {
+                    HwBlob _hidl_blob = _hidl_reply.readBuffer(16 /* size */);
+                    {
+                        int _hidl_vec_size = _hidl_blob.getInt32(0 /* offset */ + 8 /* offsetof(hidl_vec<T>, mSize) */);
+                        HwBlob childBlob = _hidl_reply.readEmbeddedBuffer(
+                                _hidl_vec_size * 32,_hidl_blob.handle(),
+                                0 /* offset */ + 0 /* offsetof(hidl_vec<T>, mBuffer) */,true /* nullable */);
+
+                        ((java.util.ArrayList<byte[/* 32 */]>) _hidl_out_hashchain).clear();
+                        for (int _hidl_index_0 = 0; _hidl_index_0 < _hidl_vec_size; ++_hidl_index_0) {
+                            byte[/* 32 */] _hidl_vec_element = new byte[32];
+                            {
+                                long _hidl_array_offset_1 = _hidl_index_0 * 32;
+                                childBlob.copyToInt8Array(_hidl_array_offset_1, (byte[/* 32 */]) _hidl_vec_element, 32 /* size */);
+                                _hidl_array_offset_1 += 32 * 1;
+                            }
+                            ((java.util.ArrayList<byte[/* 32 */]>) _hidl_out_hashchain).add(_hidl_vec_element);
+                        }
+                    }
+                }
+                return _hidl_out_hashchain;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void setHALInstrumentation()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256462420 /* setHALInstrumentation */, _hidl_request, _hidl_reply, 1 /* oneway */);
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public boolean linkToDeath(IHwBinder.DeathRecipient recipient, long cookie)
+                throws android.os.RemoteException {
+            return mRemote.linkToDeath(recipient, cookie);
+        }
+        @Override
+        public void ping()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256921159 /* ping */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public android.internal.hidl.base.V1_0.DebugInfo getDebugInfo()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(257049926 /* getDebugInfo */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                android.internal.hidl.base.V1_0.DebugInfo _hidl_out_info = new android.internal.hidl.base.V1_0.DebugInfo();
+                ((android.internal.hidl.base.V1_0.DebugInfo) _hidl_out_info).readFromParcel(_hidl_reply);
+                return _hidl_out_info;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void notifySyspropsChanged()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(257120595 /* notifySyspropsChanged */, _hidl_request, _hidl_reply, 1 /* oneway */);
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public boolean unlinkToDeath(IHwBinder.DeathRecipient recipient)
+                throws android.os.RemoteException {
+            return mRemote.unlinkToDeath(recipient);
+        }
+    }
+
+    public static abstract class Stub extends HwBinder implements IBluetoothHci {
+        @Override
+        public IHwBinder asBinder() {
+            return this;
+        }
+
+        @Override
+        public final java.util.ArrayList<String> interfaceChain() {
+            return new java.util.ArrayList<String>(java.util.Arrays.asList(
+                    android.hardware.bluetooth.V1_1.IBluetoothHci.kInterfaceName,
+                    android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName,
+                    android.internal.hidl.base.V1_0.IBase.kInterfaceName));
+
+        }
+
+        @Override
+        public void debug(NativeHandle fd, java.util.ArrayList<String> options) {
+            return;
+
+        }
+
+        @Override
+        public final String interfaceDescriptor() {
+            return android.hardware.bluetooth.V1_1.IBluetoothHci.kInterfaceName;
+
+        }
+
+        @Override
+        public final java.util.ArrayList<byte[/* 32 */]> getHashChain() {
+            return new java.util.ArrayList<byte[/* 32 */]>(java.util.Arrays.asList(
+                    new byte[/* 32 */]{54,47,-47,-62,22,65,-62,34,79,59,-128,-61,13,-105,-105,-71,-120,-6,63,52,66,67,-43,49,-70,115,-59,83,119,-102,87,99} /* 362fd1c21641c2224f3b80c30d9797b988fa3f344243d531ba73c553779a5763 */,
+                    new byte[/* 32 */]{52,124,-25,70,-127,86,7,86,127,95,59,83,-28,-128,9,-104,-54,90,-71,53,81,65,-16,-120,15,-64,-49,12,31,-59,-61,85} /* 347ce746815607567f5f3b53e4800998ca5ab9355141f0880fc0cf0c1fc5c355 */,
+                    new byte[/* 32 */]{-20,127,-41,-98,-48,45,-6,-123,-68,73,-108,38,-83,-82,62,-66,35,-17,5,36,-13,-51,105,87,19,-109,36,-72,59,24,-54,76} /* ec7fd79ed02dfa85bc499426adae3ebe23ef0524f3cd6957139324b83b18ca4c */));
+
+        }
+
+        @Override
+        public final void setHALInstrumentation() {
+
+        }
+
+        @Override
+        public final boolean linkToDeath(IHwBinder.DeathRecipient recipient, long cookie) {
+            return true;
+
+        }
+
+        @Override
+        public final void ping() {
+            return;
+
+        }
+
+        @Override
+        public final android.internal.hidl.base.V1_0.DebugInfo getDebugInfo() {
+            android.internal.hidl.base.V1_0.DebugInfo info = new android.internal.hidl.base.V1_0.DebugInfo();
+            info.pid = HidlSupport.getPidIfSharable();
+            info.ptr = 0;
+            info.arch = android.internal.hidl.base.V1_0.DebugInfo.Architecture.UNKNOWN;
+            return info;
+
+        }
+
+        @Override
+        public final void notifySyspropsChanged() {
+            HwBinder.enableInstrumentation();
+
+        }
+
+        @Override
+        public final boolean unlinkToDeath(IHwBinder.DeathRecipient recipient) {
+            return true;
+
+        }
+
+        @Override
+        public IHwInterface queryLocalInterface(String descriptor) {
+            if (kInterfaceName.equals(descriptor)) {
+                return this;
+            }
+            return null;
+        }
+
+        public void registerAsService(String serviceName) throws android.os.RemoteException {
+            registerService(serviceName);
+        }
+
+        @Override
+        public String toString() {
+            return this.interfaceDescriptor() + "@Stub";
+        }
+
+        //@Override
+        public void onTransact(int _hidl_code, HwParcel _hidl_request, final HwParcel _hidl_reply, int _hidl_flags)
+                throws android.os.RemoteException {
+            switch (_hidl_code) {
+                case 1 /* initialize */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+
+                    android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks callback = android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.asInterface(_hidl_request.readStrongBinder());
+                    initialize(callback);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 2 /* sendHciCommand */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+
+                    java.util.ArrayList<Byte> command = _hidl_request.readInt8Vector();
+                    sendHciCommand(command);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 3 /* sendAclData */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+
+                    java.util.ArrayList<Byte> data = _hidl_request.readInt8Vector();
+                    sendAclData(data);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 4 /* sendScoData */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+
+                    java.util.ArrayList<Byte> data = _hidl_request.readInt8Vector();
+                    sendScoData(data);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 5 /* close */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHci.kInterfaceName);
+
+                    close();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 6 /* initialize_1_1 */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_1.IBluetoothHci.kInterfaceName);
+
+                    android.hardware.bluetooth.V1_1.IBluetoothHciCallbacks callback = android.hardware.bluetooth.V1_1.IBluetoothHciCallbacks.asInterface(_hidl_request.readStrongBinder());
+                    initialize_1_1(callback);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 7 /* sendIsoData */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_1.IBluetoothHci.kInterfaceName);
+
+                    java.util.ArrayList<Byte> data = _hidl_request.readInt8Vector();
+                    sendIsoData(data);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256067662 /* interfaceChain */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    java.util.ArrayList<String> _hidl_out_descriptors = interfaceChain();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.writeStringVector(_hidl_out_descriptors);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256131655 /* debug */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    NativeHandle fd = _hidl_request.readNativeHandle();
+                    java.util.ArrayList<String> options = _hidl_request.readStringVector();
+                    debug(fd, options);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256136003 /* interfaceDescriptor */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    String _hidl_out_descriptor = interfaceDescriptor();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.writeString(_hidl_out_descriptor);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256398152 /* getHashChain */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    java.util.ArrayList<byte[/* 32 */]> _hidl_out_hashchain = getHashChain();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    {
+                        HwBlob _hidl_blob = new HwBlob(16 /* size */);
+                        {
+                            int _hidl_vec_size = _hidl_out_hashchain.size();
+                            _hidl_blob.putInt32(0 /* offset */ + 8 /* offsetof(hidl_vec<T>, mSize) */, _hidl_vec_size);
+                            _hidl_blob.putBool(0 /* offset */ + 12 /* offsetof(hidl_vec<T>, mOwnsBuffer) */, false);
+                            HwBlob childBlob = new HwBlob((int)(_hidl_vec_size * 32));
+                            for (int _hidl_index_0 = 0; _hidl_index_0 < _hidl_vec_size; ++_hidl_index_0) {
+                                {
+                                    long _hidl_array_offset_1 = _hidl_index_0 * 32;
+                                    byte[] _hidl_array_item_1 = (byte[/* 32 */]) _hidl_out_hashchain.get(_hidl_index_0);
+
+                                    if (_hidl_array_item_1 == null || _hidl_array_item_1.length != 32) {
+                                        throw new IllegalArgumentException("Array element is not of the expected length");
+                                    }
+
+                                    childBlob.putInt8Array(_hidl_array_offset_1, _hidl_array_item_1);
+                                    _hidl_array_offset_1 += 32 * 1;
+                                }
+                            }
+                            _hidl_blob.putBlob(0 /* offset */ + 0 /* offsetof(hidl_vec<T>, mBuffer) */, childBlob);
+                        }
+                        _hidl_reply.writeBuffer(_hidl_blob);
+                    }
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256462420 /* setHALInstrumentation */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    setHALInstrumentation();
+                    break;
+                }
+
+                case 256660548 /* linkToDeath */:
+                {
+                break;
+                }
+
+                case 256921159 /* ping */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    ping();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 257049926 /* getDebugInfo */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    android.internal.hidl.base.V1_0.DebugInfo _hidl_out_info = getDebugInfo();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    ((android.internal.hidl.base.V1_0.DebugInfo) _hidl_out_info).writeToParcel(_hidl_reply);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 257120595 /* notifySyspropsChanged */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    notifySyspropsChanged();
+                    break;
+                }
+
+                case 257250372 /* unlinkToDeath */:
+                {
+                break;
+                }
+
+            }
+        }
+    }
+}

extras/android/RemoteHCI/app/src/main/java/android/hardware/bluetooth/V1_1/IBluetoothHciCallbacks.java

@@ -0,0 +1,774 @@
+package android.hardware.bluetooth.V1_1;
+
+import android.os.HidlSupport;
+import android.os.HwBinder;
+import android.os.IHwBinder;
+import android.os.HwBlob;
+import android.os.HwParcel;
+import android.os.IHwInterface;
+import android.os.NativeHandle;
+
+/**
+ * The interface from the Bluetooth Controller to the stack.
+ */
+public interface IBluetoothHciCallbacks extends android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks {
+    /**
+     * Fully-qualified interface name for this interface.
+     */
+    public static final String kInterfaceName = "android.hardware.bluetooth@1.1::IBluetoothHciCallbacks";
+
+    /**
+     * Does a checked conversion from a binder to this class.
+     */
+    /* package private */ static IBluetoothHciCallbacks asInterface(IHwBinder binder) {
+        if (binder == null) {
+            return null;
+        }
+
+        IHwInterface iface =
+                binder.queryLocalInterface(kInterfaceName);
+
+        if ((iface != null) && (iface instanceof IBluetoothHciCallbacks)) {
+            return (IBluetoothHciCallbacks)iface;
+        }
+
+        IBluetoothHciCallbacks proxy = new IBluetoothHciCallbacks.Proxy(binder);
+
+        try {
+            for (String descriptor : proxy.interfaceChain()) {
+                if (descriptor.equals(kInterfaceName)) {
+                    return proxy;
+                }
+            }
+        } catch (android.os.RemoteException e) {
+        }
+
+        return null;
+    }
+
+    /**
+     * Does a checked conversion from any interface to this class.
+     */
+    public static IBluetoothHciCallbacks castFrom(IHwInterface iface) {
+        return (iface == null) ? null : IBluetoothHciCallbacks.asInterface(iface.asBinder());
+    }
+
+    @Override
+    public IHwBinder asBinder();
+
+    /**
+     * This will invoke the equivalent of the C++ getService(std::string) if retry is
+     * true or tryGetService(std::string) if retry is false. If the service is
+     * available on the device and retry is true, this will wait for the service to
+     * start.
+     *
+     */
+    public static IBluetoothHciCallbacks getService(String serviceName, boolean retry) throws android.os.RemoteException {
+        return IBluetoothHciCallbacks.asInterface(HwBinder.getService("android.hardware.bluetooth@1.1::IBluetoothHciCallbacks", serviceName, retry));
+    }
+
+    /**
+     * Calls getService("default",retry).
+     */
+    public static IBluetoothHciCallbacks getService(boolean retry) throws android.os.RemoteException {
+        return getService("default", retry);
+    }
+
+    /**
+     * @deprecated this will not wait for the interface to come up if it hasn't yet
+     * started. See getService(String,boolean) instead.
+     */
+    @Deprecated
+    public static IBluetoothHciCallbacks getService(String serviceName) throws android.os.RemoteException {
+        return IBluetoothHciCallbacks.asInterface(HwBinder.getService("android.hardware.bluetooth@1.1::IBluetoothHciCallbacks", serviceName));
+    }
+
+    /**
+     * @deprecated this will not wait for the interface to come up if it hasn't yet
+     * started. See getService(boolean) instead.
+     */
+    @Deprecated
+    public static IBluetoothHciCallbacks getService() throws android.os.RemoteException {
+        return getService("default");
+    }
+
+    /**
+     * Send a ISO data packet form the controller to the host.
+     * @param data the ISO HCI packet to be passed to the host stack
+     */
+    void isoDataReceived(java.util.ArrayList<Byte> data)
+        throws android.os.RemoteException;
+    /*
+     * Provides run-time type information for this object.
+     * For example, for the following interface definition:
+     *     package android.hardware.foo@1.0;
+     *     interface IParent {};
+     *     interface IChild extends IParent {};
+     * Calling interfaceChain on an IChild object must yield the following:
+     *     ["android.hardware.foo@1.0::IChild",
+     *      "android.hardware.foo@1.0::IParent"
+     *      "android.internal.hidl.base@1.0::IBase"]
+     *
+     * @return descriptors a vector of descriptors of the run-time type of the
+     *         object.
+     */
+    java.util.ArrayList<String> interfaceChain()
+        throws android.os.RemoteException;
+    /*
+     * Emit diagnostic information to the given file.
+     *
+     * Optionally overriden.
+     *
+     * @param fd      File descriptor to dump data to.
+     *                Must only be used for the duration of this call.
+     * @param options Arguments for debugging.
+     *                Must support empty for default debug information.
+     */
+    void debug(NativeHandle fd, java.util.ArrayList<String> options)
+        throws android.os.RemoteException;
+    /*
+     * Provides run-time type information for this object.
+     * For example, for the following interface definition:
+     *     package android.hardware.foo@1.0;
+     *     interface IParent {};
+     *     interface IChild extends IParent {};
+     * Calling interfaceDescriptor on an IChild object must yield
+     *     "android.hardware.foo@1.0::IChild"
+     *
+     * @return descriptor a descriptor of the run-time type of the
+     *         object (the first element of the vector returned by
+     *         interfaceChain())
+     */
+    String interfaceDescriptor()
+        throws android.os.RemoteException;
+    /*
+     * Returns hashes of the source HAL files that define the interfaces of the
+     * runtime type information on the object.
+     * For example, for the following interface definition:
+     *     package android.hardware.foo@1.0;
+     *     interface IParent {};
+     *     interface IChild extends IParent {};
+     * Calling interfaceChain on an IChild object must yield the following:
+     *     [(hash of IChild.hal),
+     *      (hash of IParent.hal)
+     *      (hash of IBase.hal)].
+     *
+     * SHA-256 is used as the hashing algorithm. Each hash has 32 bytes
+     * according to SHA-256 standard.
+     *
+     * @return hashchain a vector of SHA-1 digests
+     */
+    java.util.ArrayList<byte[/* 32 */]> getHashChain()
+        throws android.os.RemoteException;
+    /*
+     * This method trigger the interface to enable/disable instrumentation based
+     * on system property hal.instrumentation.enable.
+     */
+    void setHALInstrumentation()
+        throws android.os.RemoteException;
+    /*
+     * Registers a death recipient, to be called when the process hosting this
+     * interface dies.
+     *
+     * @param recipient a hidl_death_recipient callback object
+     * @param cookie a cookie that must be returned with the callback
+     * @return success whether the death recipient was registered successfully.
+     */
+    boolean linkToDeath(IHwBinder.DeathRecipient recipient, long cookie)
+        throws android.os.RemoteException;
+    /*
+     * Provides way to determine if interface is running without requesting
+     * any functionality.
+     */
+    void ping()
+        throws android.os.RemoteException;
+    /*
+     * Get debug information on references on this interface.
+     * @return info debugging information. See comments of DebugInfo.
+     */
+    android.internal.hidl.base.V1_0.DebugInfo getDebugInfo()
+        throws android.os.RemoteException;
+    /*
+     * This method notifies the interface that one or more system properties
+     * have changed. The default implementation calls
+     * (C++)  report_sysprop_change() in libcutils or
+     * (Java) android.os.SystemProperties.reportSyspropChanged,
+     * which in turn calls a set of registered callbacks (eg to update trace
+     * tags).
+     */
+    void notifySyspropsChanged()
+        throws android.os.RemoteException;
+    /*
+     * Unregisters the registered death recipient. If this service was registered
+     * multiple times with the same exact death recipient, this unlinks the most
+     * recently registered one.
+     *
+     * @param recipient a previously registered hidl_death_recipient callback
+     * @return success whether the death recipient was unregistered successfully.
+     */
+    boolean unlinkToDeath(IHwBinder.DeathRecipient recipient)
+        throws android.os.RemoteException;
+
+    public static final class Proxy implements IBluetoothHciCallbacks {
+        private IHwBinder mRemote;
+
+        public Proxy(IHwBinder remote) {
+            mRemote = java.util.Objects.requireNonNull(remote);
+        }
+
+        @Override
+        public IHwBinder asBinder() {
+            return mRemote;
+        }
+
+        @Override
+        public String toString() {
+            try {
+                return this.interfaceDescriptor() + "@Proxy";
+            } catch (android.os.RemoteException ex) {
+                /* ignored; handled below. */
+            }
+            return "[class or subclass of " + IBluetoothHciCallbacks.kInterfaceName + "]@Proxy";
+        }
+
+        @Override
+        public final boolean equals(java.lang.Object other) {
+            return HidlSupport.interfacesEqual(this, other);
+        }
+
+        @Override
+        public final int hashCode() {
+            return this.asBinder().hashCode();
+        }
+
+        // Methods from ::android::hardware::bluetooth::V1_0::IBluetoothHciCallbacks follow.
+        @Override
+        public void initializationComplete(int status)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+            _hidl_request.writeInt32(status);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(1 /* initializationComplete */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void hciEventReceived(java.util.ArrayList<Byte> event)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+            _hidl_request.writeInt8Vector(event);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(2 /* hciEventReceived */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void aclDataReceived(java.util.ArrayList<Byte> data)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+            _hidl_request.writeInt8Vector(data);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(3 /* aclDataReceived */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void scoDataReceived(java.util.ArrayList<Byte> data)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+            _hidl_request.writeInt8Vector(data);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(4 /* scoDataReceived */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        // Methods from ::android::hardware::bluetooth::V1_1::IBluetoothHciCallbacks follow.
+        @Override
+        public void isoDataReceived(java.util.ArrayList<Byte> data)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.hardware.bluetooth.V1_1.IBluetoothHciCallbacks.kInterfaceName);
+            _hidl_request.writeInt8Vector(data);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(5 /* isoDataReceived */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        // Methods from ::android::hidl::base::V1_0::IBase follow.
+        @Override
+        public java.util.ArrayList<String> interfaceChain()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256067662 /* interfaceChain */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                java.util.ArrayList<String> _hidl_out_descriptors = _hidl_reply.readStringVector();
+                return _hidl_out_descriptors;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void debug(NativeHandle fd, java.util.ArrayList<String> options)
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+            _hidl_request.writeNativeHandle(fd);
+            _hidl_request.writeStringVector(options);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256131655 /* debug */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public String interfaceDescriptor()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256136003 /* interfaceDescriptor */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                String _hidl_out_descriptor = _hidl_reply.readString();
+                return _hidl_out_descriptor;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public java.util.ArrayList<byte[/* 32 */]> getHashChain()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256398152 /* getHashChain */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                java.util.ArrayList<byte[/* 32 */]> _hidl_out_hashchain =  new java.util.ArrayList<byte[/* 32 */]>();
+                {
+                    HwBlob _hidl_blob = _hidl_reply.readBuffer(16 /* size */);
+                    {
+                        int _hidl_vec_size = _hidl_blob.getInt32(0 /* offset */ + 8 /* offsetof(hidl_vec<T>, mSize) */);
+                        HwBlob childBlob = _hidl_reply.readEmbeddedBuffer(
+                                _hidl_vec_size * 32,_hidl_blob.handle(),
+                                0 /* offset */ + 0 /* offsetof(hidl_vec<T>, mBuffer) */,true /* nullable */);
+
+                        ((java.util.ArrayList<byte[/* 32 */]>) _hidl_out_hashchain).clear();
+                        for (int _hidl_index_0 = 0; _hidl_index_0 < _hidl_vec_size; ++_hidl_index_0) {
+                            byte[/* 32 */] _hidl_vec_element = new byte[32];
+                            {
+                                long _hidl_array_offset_1 = _hidl_index_0 * 32;
+                                childBlob.copyToInt8Array(_hidl_array_offset_1, (byte[/* 32 */]) _hidl_vec_element, 32 /* size */);
+                                _hidl_array_offset_1 += 32 * 1;
+                            }
+                            ((java.util.ArrayList<byte[/* 32 */]>) _hidl_out_hashchain).add(_hidl_vec_element);
+                        }
+                    }
+                }
+                return _hidl_out_hashchain;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void setHALInstrumentation()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256462420 /* setHALInstrumentation */, _hidl_request, _hidl_reply, 1 /* oneway */);
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public boolean linkToDeath(IHwBinder.DeathRecipient recipient, long cookie)
+                throws android.os.RemoteException {
+            return mRemote.linkToDeath(recipient, cookie);
+        }
+        @Override
+        public void ping()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(256921159 /* ping */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public android.internal.hidl.base.V1_0.DebugInfo getDebugInfo()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(257049926 /* getDebugInfo */, _hidl_request, _hidl_reply, 0 /* flags */);
+                _hidl_reply.verifySuccess();
+                _hidl_request.releaseTemporaryStorage();
+
+                android.internal.hidl.base.V1_0.DebugInfo _hidl_out_info = new android.internal.hidl.base.V1_0.DebugInfo();
+                ((android.internal.hidl.base.V1_0.DebugInfo) _hidl_out_info).readFromParcel(_hidl_reply);
+                return _hidl_out_info;
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public void notifySyspropsChanged()
+                throws android.os.RemoteException {
+            HwParcel _hidl_request = new HwParcel();
+            _hidl_request.writeInterfaceToken(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+            HwParcel _hidl_reply = new HwParcel();
+            try {
+                mRemote.transact(257120595 /* notifySyspropsChanged */, _hidl_request, _hidl_reply, 1 /* oneway */);
+                _hidl_request.releaseTemporaryStorage();
+            } finally {
+                _hidl_reply.release();
+            }
+        }
+
+        @Override
+        public boolean unlinkToDeath(IHwBinder.DeathRecipient recipient)
+                throws android.os.RemoteException {
+            return mRemote.unlinkToDeath(recipient);
+        }
+    }
+
+    public static abstract class Stub extends HwBinder implements IBluetoothHciCallbacks {
+        @Override
+        public IHwBinder asBinder() {
+            return this;
+        }
+
+        @Override
+        public final java.util.ArrayList<String> interfaceChain() {
+            return new java.util.ArrayList<String>(java.util.Arrays.asList(
+                    android.hardware.bluetooth.V1_1.IBluetoothHciCallbacks.kInterfaceName,
+                    android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName,
+                    android.internal.hidl.base.V1_0.IBase.kInterfaceName));
+
+        }
+
+        @Override
+        public void debug(NativeHandle fd, java.util.ArrayList<String> options) {
+            return;
+
+        }
+
+        @Override
+        public final String interfaceDescriptor() {
+            return android.hardware.bluetooth.V1_1.IBluetoothHciCallbacks.kInterfaceName;
+
+        }
+
+        @Override
+        public final java.util.ArrayList<byte[/* 32 */]> getHashChain() {
+            return new java.util.ArrayList<byte[/* 32 */]>(java.util.Arrays.asList(
+                    new byte[/* 32 */]{64,-85,44,104,102,-63,-115,50,-70,-10,-28,-98,48,83,-108,-98,121,96,31,86,-106,58,121,30,-109,-26,-117,-98,-31,-113,113,-115} /* 40ab2c6866c18d32baf6e49e3053949e79601f56963a791e93e68b9ee18f718d */,
+                    new byte[/* 32 */]{-125,95,65,-66,34,-127,-65,-78,47,62,51,-58,-6,-121,11,-34,123,-62,30,55,-27,-49,-70,-7,-93,111,-1,23,6,50,-9,84} /* 835f41be2281bfb22f3e33c6fa870bde7bc21e37e5cfbaf9a36fff170632f754 */,
+                    new byte[/* 32 */]{-20,127,-41,-98,-48,45,-6,-123,-68,73,-108,38,-83,-82,62,-66,35,-17,5,36,-13,-51,105,87,19,-109,36,-72,59,24,-54,76} /* ec7fd79ed02dfa85bc499426adae3ebe23ef0524f3cd6957139324b83b18ca4c */));
+
+        }
+
+        @Override
+        public final void setHALInstrumentation() {
+
+        }
+
+        @Override
+        public final boolean linkToDeath(IHwBinder.DeathRecipient recipient, long cookie) {
+            return true;
+
+        }
+
+        @Override
+        public final void ping() {
+            return;
+
+        }
+
+        @Override
+        public final android.internal.hidl.base.V1_0.DebugInfo getDebugInfo() {
+            android.internal.hidl.base.V1_0.DebugInfo info = new android.internal.hidl.base.V1_0.DebugInfo();
+            info.pid = HidlSupport.getPidIfSharable();
+            info.ptr = 0;
+            info.arch = android.internal.hidl.base.V1_0.DebugInfo.Architecture.UNKNOWN;
+            return info;
+
+        }
+
+        @Override
+        public final void notifySyspropsChanged() {
+            HwBinder.enableInstrumentation();
+
+        }
+
+        @Override
+        public final boolean unlinkToDeath(IHwBinder.DeathRecipient recipient) {
+            return true;
+
+        }
+
+        @Override
+        public IHwInterface queryLocalInterface(String descriptor) {
+            if (kInterfaceName.equals(descriptor)) {
+                return this;
+            }
+            return null;
+        }
+
+        public void registerAsService(String serviceName) throws android.os.RemoteException {
+            registerService(serviceName);
+        }
+
+        @Override
+        public String toString() {
+            return this.interfaceDescriptor() + "@Stub";
+        }
+
+        //@Override
+        public void onTransact(int _hidl_code, HwParcel _hidl_request, final HwParcel _hidl_reply, int _hidl_flags)
+                throws android.os.RemoteException {
+            switch (_hidl_code) {
+                case 1 /* initializationComplete */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+
+                    int status = _hidl_request.readInt32();
+                    initializationComplete(status);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 2 /* hciEventReceived */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+
+                    java.util.ArrayList<Byte> event = _hidl_request.readInt8Vector();
+                    hciEventReceived(event);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 3 /* aclDataReceived */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+
+                    java.util.ArrayList<Byte> data = _hidl_request.readInt8Vector();
+                    aclDataReceived(data);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 4 /* scoDataReceived */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.kInterfaceName);
+
+                    java.util.ArrayList<Byte> data = _hidl_request.readInt8Vector();
+                    scoDataReceived(data);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 5 /* isoDataReceived */:
+                {
+                    _hidl_request.enforceInterface(android.hardware.bluetooth.V1_1.IBluetoothHciCallbacks.kInterfaceName);
+
+                    java.util.ArrayList<Byte> data = _hidl_request.readInt8Vector();
+                    isoDataReceived(data);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256067662 /* interfaceChain */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    java.util.ArrayList<String> _hidl_out_descriptors = interfaceChain();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.writeStringVector(_hidl_out_descriptors);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256131655 /* debug */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    NativeHandle fd = _hidl_request.readNativeHandle();
+                    java.util.ArrayList<String> options = _hidl_request.readStringVector();
+                    debug(fd, options);
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256136003 /* interfaceDescriptor */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    String _hidl_out_descriptor = interfaceDescriptor();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.writeString(_hidl_out_descriptor);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256398152 /* getHashChain */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    java.util.ArrayList<byte[/* 32 */]> _hidl_out_hashchain = getHashChain();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    {
+                        HwBlob _hidl_blob = new HwBlob(16 /* size */);
+                        {
+                            int _hidl_vec_size = _hidl_out_hashchain.size();
+                            _hidl_blob.putInt32(0 /* offset */ + 8 /* offsetof(hidl_vec<T>, mSize) */, _hidl_vec_size);
+                            _hidl_blob.putBool(0 /* offset */ + 12 /* offsetof(hidl_vec<T>, mOwnsBuffer) */, false);
+                            HwBlob childBlob = new HwBlob((int)(_hidl_vec_size * 32));
+                            for (int _hidl_index_0 = 0; _hidl_index_0 < _hidl_vec_size; ++_hidl_index_0) {
+                                {
+                                    long _hidl_array_offset_1 = _hidl_index_0 * 32;
+                                    byte[] _hidl_array_item_1 = (byte[/* 32 */]) _hidl_out_hashchain.get(_hidl_index_0);
+
+                                    if (_hidl_array_item_1 == null || _hidl_array_item_1.length != 32) {
+                                        throw new IllegalArgumentException("Array element is not of the expected length");
+                                    }
+
+                                    childBlob.putInt8Array(_hidl_array_offset_1, _hidl_array_item_1);
+                                    _hidl_array_offset_1 += 32 * 1;
+                                }
+                            }
+                            _hidl_blob.putBlob(0 /* offset */ + 0 /* offsetof(hidl_vec<T>, mBuffer) */, childBlob);
+                        }
+                        _hidl_reply.writeBuffer(_hidl_blob);
+                    }
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 256462420 /* setHALInstrumentation */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    setHALInstrumentation();
+                    break;
+                }
+
+                case 256660548 /* linkToDeath */:
+                {
+                break;
+                }
+
+                case 256921159 /* ping */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    ping();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 257049926 /* getDebugInfo */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    android.internal.hidl.base.V1_0.DebugInfo _hidl_out_info = getDebugInfo();
+                    _hidl_reply.writeStatus(HwParcel.STATUS_SUCCESS);
+                    ((android.internal.hidl.base.V1_0.DebugInfo) _hidl_out_info).writeToParcel(_hidl_reply);
+                    _hidl_reply.send();
+                    break;
+                }
+
+                case 257120595 /* notifySyspropsChanged */:
+                {
+                    _hidl_request.enforceInterface(android.internal.hidl.base.V1_0.IBase.kInterfaceName);
+
+                    notifySyspropsChanged();
+                    break;
+                }
+
+                case 257250372 /* unlinkToDeath */:
+                {
+                break;
+                }
+
+            }
+        }
+    }
+}

extras/android/RemoteHCI/app/src/main/java/com/github/google/bumble/remotehci/HciHal.java

@@ -0,0 +1,260 @@
+package com.github.google.bumble.remotehci;
+
+import android.hardware.bluetooth.V1_0.Status;
+import android.os.IBinder;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.util.Log;
+
+import java.util.ArrayList;
+import java.util.NoSuchElementException;
+
+public interface HciHal {
+    public enum Status {
+        SUCCESS("SUCCESS"),
+        ALREADY_INITIALIZED("ALREADY_INITIALIZED"),
+        UNABLE_TO_OPEN_INTERFACE("UNABLE_TO_OPEN_INTERFACE"),
+        INITIALIZATION_ERROR("INITIALIZATION_ERROR"),
+        TRANSPORT_ERROR("TRANSPORT_ERROR"),
+        UNKNOWN("UNKNOWN");
+
+        public final String label;
+
+        private Status(String label) {
+            this.label = label;
+        }
+    }
+    static final String TAG = "HciHal";
+    public static HciHal create(HciHalCallback hciCallbacks) {
+        // First try HIDL
+        HciHal hciHal = HciHidlHal.create(hciCallbacks);
+        if (hciHal != null) {
+            Log.d(TAG, "Found HIDL HAL");
+            return hciHal;
+        }
+
+        // Then try AIDL
+        hciHal = HciAidlHal.create(hciCallbacks);
+        if (hciHal != null) {
+            Log.d(TAG, "Found AIDL HAL");
+            return hciHal;
+        }
+
+        Log.d(TAG, "No HAL found");
+        return null;
+    }
+
+    public Status initialize() throws RemoteException, InterruptedException;
+    public void sendPacket(HciPacket.Type type, byte[] packet);
+}
+
+class HciHidlHal extends android.hardware.bluetooth.V1_0.IBluetoothHciCallbacks.Stub implements HciHal {
+    private static final String TAG = "HciHidlHal";
+    private final android.hardware.bluetooth.V1_0.IBluetoothHci mHciService;
+    private final HciHalCallback mHciCallbacks;
+    private int mInitializationStatus = -1;
+
+
+    public static HciHidlHal create(HciHalCallback hciCallbacks) {
+        // Get the HAL service.
+        android.hardware.bluetooth.V1_0.IBluetoothHci hciService;
+        try {
+            hciService = android.hardware.bluetooth.V1_0.IBluetoothHci.getService(true);
+        } catch (NoSuchElementException e) {
+            Log.d(TAG, "HIDL HAL V1.0 not found");
+            return null;
+        } catch (android.os.RemoteException e) {
+            Log.w(TAG, "Exception from getService: " + e);
+            return null;
+        }
+        Log.d(TAG, "Found HIDL HAL V1.0");
+        return new HciHidlHal(hciService, hciCallbacks);
+    }
+
+    private HciHidlHal(android.hardware.bluetooth.V1_0.IBluetoothHci hciService, HciHalCallback hciCallbacks) {
+        mHciService = hciService;
+        mHciCallbacks = hciCallbacks;
+    }
+
+    public Status initialize() throws RemoteException, InterruptedException {
+        // Trigger the initialization.
+        mHciService.initialize(this);
+
+        // Wait for the initialization to complete.
+        Log.d(TAG, "Waiting for initialization status...");
+        synchronized (this) {
+            while (mInitializationStatus == -1) {
+                wait();
+            }
+        }
+
+        // Map the status code.
+        switch (mInitializationStatus) {
+            case android.hardware.bluetooth.V1_0.Status.SUCCESS:
+                return Status.SUCCESS;
+
+            case android.hardware.bluetooth.V1_0.Status.TRANSPORT_ERROR:
+                return Status.TRANSPORT_ERROR;
+
+            case android.hardware.bluetooth.V1_0.Status.INITIALIZATION_ERROR:
+                return Status.INITIALIZATION_ERROR;
+
+            default:
+                return Status.UNKNOWN;
+        }
+    }
+
+    @Override
+    public void sendPacket(HciPacket.Type type, byte[] packet) {
+        ArrayList<Byte> data = HciPacket.byteArrayToList(packet);
+
+        try {
+            switch (type) {
+                case COMMAND:
+                    mHciService.sendHciCommand(data);
+                    break;
+
+                case ACL_DATA:
+                    mHciService.sendAclData(data);
+                    break;
+
+                case SCO_DATA:
+                    mHciService.sendScoData(data);
+                    break;
+            }
+        } catch (RemoteException error) {
+            Log.w(TAG, "failed to forward packet: " + error);
+        }
+    }
+
+    @Override
+    public synchronized void initializationComplete(int status) throws RemoteException {
+        mInitializationStatus = status;
+        notifyAll();
+    }
+
+    @Override
+    public void hciEventReceived(ArrayList<Byte> event) throws RemoteException {
+        byte[] packet = HciPacket.listToByteArray(event);
+        mHciCallbacks.onPacket(HciPacket.Type.EVENT, packet);
+    }
+
+    @Override
+    public void aclDataReceived(ArrayList<Byte> data) throws RemoteException {
+        byte[] packet = HciPacket.listToByteArray(data);
+        mHciCallbacks.onPacket(HciPacket.Type.ACL_DATA, packet);
+    }
+
+    @Override
+    public void scoDataReceived(ArrayList<Byte> data) throws RemoteException {
+        byte[] packet = HciPacket.listToByteArray(data);
+        mHciCallbacks.onPacket(HciPacket.Type.SCO_DATA, packet);
+    }
+}
+
+class HciAidlHal extends android.hardware.bluetooth.IBluetoothHciCallbacks.Stub implements HciHal {
+    private static final String TAG = "HciAidlHal";
+    private final android.hardware.bluetooth.IBluetoothHci mHciService;
+    private final HciHalCallback mHciCallbacks;
+    private int mInitializationStatus = android.hardware.bluetooth.Status.SUCCESS;
+
+    public static HciAidlHal create(HciHalCallback hciCallbacks) {
+        IBinder binder = ServiceManager.getService("android.hardware.bluetooth.IBluetoothHci/default");
+        if (binder == null) {
+            Log.d(TAG, "AIDL HAL not found");
+            return null;
+        }
+        android.hardware.bluetooth.IBluetoothHci hciService = android.hardware.bluetooth.IBluetoothHci.Stub.asInterface(binder);
+        return new HciAidlHal(hciService, hciCallbacks);
+    }
+
+    private HciAidlHal(android.hardware.bluetooth.IBluetoothHci hciService, HciHalCallback hciCallbacks) {
+        super();
+        mHciService = hciService;
+        mHciCallbacks = hciCallbacks;
+    }
+
+    public Status initialize() throws RemoteException, InterruptedException {
+        // Trigger the initialization.
+        mHciService.initialize(this);
+
+        // Wait for the initialization to complete.
+        Log.d(TAG, "Waiting for initialization status...");
+        synchronized (this) {
+            while (mInitializationStatus == -1) {
+                wait();
+            }
+        }
+
+        // Map the status code.
+        switch (mInitializationStatus) {
+            case android.hardware.bluetooth.Status.SUCCESS:
+                return Status.SUCCESS;
+
+            case android.hardware.bluetooth.Status.ALREADY_INITIALIZED:
+                return Status.ALREADY_INITIALIZED;
+
+            case android.hardware.bluetooth.Status.UNABLE_TO_OPEN_INTERFACE:
+                return Status.UNABLE_TO_OPEN_INTERFACE;
+
+            case android.hardware.bluetooth.Status.HARDWARE_INITIALIZATION_ERROR:
+                return Status.INITIALIZATION_ERROR;
+
+            default:
+                return Status.UNKNOWN;
+        }
+    }
+
+    // HciHal methods.
+    @Override
+    public void sendPacket(HciPacket.Type type, byte[] packet) {
+        try {
+            switch (type) {
+                case COMMAND:
+                    mHciService.sendHciCommand(packet);
+                    break;
+
+                case ACL_DATA:
+                    mHciService.sendAclData(packet);
+                    break;
+
+                case SCO_DATA:
+                    mHciService.sendScoData(packet);
+                    break;
+
+                case ISO_DATA:
+                    mHciService.sendIsoData(packet);
+                    break;
+            }
+        } catch (RemoteException error) {
+            Log.w(TAG, "failed to forward packet: " + error);
+        }
+    }
+
+    // IBluetoothHciCallbacks methods.
+    @Override
+    public synchronized void initializationComplete(int status) throws RemoteException {
+        mInitializationStatus = status;
+        notifyAll();
+    }
+
+    @Override
+    public void hciEventReceived(byte[] event) throws RemoteException {
+        mHciCallbacks.onPacket(HciPacket.Type.EVENT, event);
+    }
+
+    @Override
+    public void aclDataReceived(byte[] data) throws RemoteException {
+        mHciCallbacks.onPacket(HciPacket.Type.ACL_DATA, data);
+    }
+
+    @Override
+    public void scoDataReceived(byte[] data) throws RemoteException {
+        mHciCallbacks.onPacket(HciPacket.Type.SCO_DATA, data);
+    }
+
+    @Override
+    public void isoDataReceived(byte[] data) throws RemoteException {
+        mHciCallbacks.onPacket(HciPacket.Type.ISO_DATA, data);
+    }
+}

extras/android/RemoteHCI/app/src/main/java/com/github/google/bumble/remotehci/HciHalCallback.java

@@ -0,0 +1,5 @@
+package com.github.google.bumble.remotehci;
+
+public interface HciHalCallback {
+    public void onPacket(HciPacket.Type type, byte[] packet);
+}

extras/android/RemoteHCI/app/src/main/java/com/github/google/bumble/remotehci/HciPacket.java

@@ -0,0 +1,69 @@
+package com.github.google.bumble.remotehci;
+
+import java.util.ArrayList;
+
+public class HciPacket {
+    public enum Type {
+        COMMAND((byte) 1),
+        ACL_DATA((byte) 2),
+        SCO_DATA((byte) 3),
+        EVENT((byte) 4),
+        ISO_DATA((byte)5);
+
+        final byte value;
+        final int lengthSize;
+        final int lengthOffset;
+
+        Type(byte value) throws IllegalArgumentException {
+            switch (value) {
+                case 1:
+                case 3:
+                    lengthSize = 1;
+                    lengthOffset = 2;
+                    break;
+
+                case 2:
+                case 5:
+                    lengthSize = 2;
+                    lengthOffset = 2;
+                    break;
+
+                case 4:
+                    lengthSize = 1;
+                    lengthOffset = 1;
+                    break;
+
+                default:
+                    throw new IllegalArgumentException();
+
+            }
+            this.value = value;
+        }
+
+        static Type fromValue(byte value) {
+            for (Type type : values()) {
+                if (type.value == value) {
+                    return type;
+                }
+            }
+            return null;
+        }
+    }
+
+    public static ArrayList<Byte> byteArrayToList(byte[] byteArray) {
+        ArrayList<Byte> list = new ArrayList<>();
+        list.ensureCapacity(byteArray.length);
+        for (byte x : byteArray) {
+            list.add(x);
+        }
+        return list;
+    }
+
+    public static byte[] listToByteArray(ArrayList<Byte> byteList) {
+        byte[] byteArray = new byte[byteList.size()];
+        for (int i = 0; i < byteList.size(); i++) {
+            byteArray[i] = byteList.get(i);
+        }
+        return byteArray;
+    }
+}

extras/android/RemoteHCI/app/src/main/java/com/github/google/bumble/remotehci/HciParser.java

@@ -0,0 +1,83 @@
+package com.github.google.bumble.remotehci;
+
+import static java.lang.Integer.min;
+
+import java.io.ByteArrayOutputStream;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+
+class HciParser {
+    Sink sink;
+    State state;
+    int bytesNeeded;
+    ByteArrayOutputStream packet = new ByteArrayOutputStream();
+    HciPacket.Type packetType;
+
+    HciParser(Sink sink) {
+        this.sink = sink;
+        reset();
+    }
+
+    void feedData(byte[] data, int dataSize) {
+        int dataOffset = 0;
+        int dataLeft = dataSize;
+
+        while (dataLeft > 0 && bytesNeeded > 0) {
+            int consumed = min(dataLeft, bytesNeeded);
+            if (state != State.NEED_TYPE) {
+                packet.write(data, dataOffset, consumed);
+            }
+            bytesNeeded -= consumed;
+
+            if (bytesNeeded == 0) {
+                if (state == State.NEED_TYPE) {
+                    packetType = HciPacket.Type.fromValue(data[dataOffset]);
+                    if (packetType == null) {
+                        throw new InvalidFormatException();
+                    }
+                    bytesNeeded = packetType.lengthOffset + packetType.lengthSize;
+                    state = State.NEED_LENGTH;
+                } else if (state == State.NEED_LENGTH) {
+                    ByteBuffer lengthBuffer =
+                            ByteBuffer.wrap(packet.toByteArray())
+                                    .order(ByteOrder.LITTLE_ENDIAN);
+                    bytesNeeded = packetType.lengthSize == 1 ?
+                            lengthBuffer.get(packetType.lengthOffset) & 0xFF :
+                            lengthBuffer.getShort(packetType.lengthOffset) & 0xFFFF;
+                    state = State.NEED_BODY;
+                }
+
+                // Emit a packet if one is complete.
+                if (state == State.NEED_BODY && bytesNeeded == 0) {
+                    if (sink != null) {
+                        sink.onPacket(packetType, packet.toByteArray());
+                    }
+
+                    reset();
+                }
+            }
+
+            dataOffset += consumed;
+            dataLeft -= consumed;
+        }
+    }
+
+    void reset() {
+        state = State.NEED_TYPE;
+        bytesNeeded = 1;
+        packet.reset();
+        packetType = null;
+    }
+
+    enum State {
+        NEED_TYPE, NEED_LENGTH, NEED_BODY
+    }
+
+    interface Sink {
+        void onPacket(HciPacket.Type type, byte[] packet);
+    }
+
+    static class InvalidFormatException extends RuntimeException {
+    }
+}

extras/android/RemoteHCI/app/src/main/java/com/github/google/bumble/remotehci/HciProxy.java

@@ -0,0 +1,143 @@
+package com.github.google.bumble.remotehci;
+
+import android.os.RemoteException;
+import android.util.Log;
+
+import java.io.IOException;
+
+public class HciProxy {
+    private static final String TAG = "HciProxy";
+    private final HciServer mServer;
+    private final Listener mListener;
+    private int mCommandPacketsReceived;
+    private int mAclPacketsReceived;
+    private int mScoPacketsReceived;
+    private int mEventPacketsSent;
+    private int mAclPacketsSent;
+    private int mScoPacketsSent;
+
+    HciProxy(int port, Listener listener) throws HalException {
+        this.mListener = listener;
+
+        // Instantiate a HAL to communicate with the hardware.
+        HciHal hciHal = HciHal.create(new HciHalCallback() {
+            @Override
+            public void onPacket(HciPacket.Type type, byte[] packet) {
+                mServer.sendPacket(type, packet);
+
+                switch (type) {
+                    case EVENT:
+                        mEventPacketsSent += 1;
+                        break;
+
+                    case ACL_DATA:
+                        mAclPacketsSent += 1;
+                        break;
+
+                    case SCO_DATA:
+                        mScoPacketsSent += 1;
+                        break;
+                }
+                updateHciPacketCount();
+            }
+        });
+        if (hciHal == null) {
+            String message = "Could not instantiate a HAL instance";
+            Log.w(TAG, message);
+            throw new HalException(message);
+        }
+
+        // Initialize the HAL.
+        HciHal.Status status = null;
+        try {
+            status = hciHal.initialize();
+        } catch (RemoteException | InterruptedException e) {
+            throw new HalException("Exception while initializing");
+        }
+        if (status != HciHal.Status.SUCCESS) {
+            String message = "HAL initialization failed: " + status.label;
+            Log.w(TAG, message);
+            throw new HalException(message);
+        }
+
+        // Create a server to accept clients.
+        mServer = new HciServer(port, new HciServer.Listener() {
+            @Override
+            public void onHostConnectionState(boolean connected) {
+                mListener.onHostConnectionState(connected);
+                if (connected) {
+                    mCommandPacketsReceived = 0;
+                    mAclPacketsReceived = 0;
+                    mScoPacketsReceived = 0;
+                    mEventPacketsSent = 0;
+                    mAclPacketsSent = 0;
+                    mScoPacketsSent = 0;
+                    updateHciPacketCount();
+                }
+            }
+
+            @Override
+            public void onMessage(String message) {
+                listener.onMessage(message);
+            }
+
+            @Override
+            public void onPacket(HciPacket.Type type, byte[] packet) {
+                Log.d(TAG, String.format("onPacket: type=%s, size=%d", type, packet.length));
+                hciHal.sendPacket(type, packet);
+
+                switch (type) {
+                    case COMMAND:
+                        mCommandPacketsReceived += 1;
+                        break;
+
+                    case ACL_DATA:
+                        mAclPacketsReceived += 1;
+                        break;
+
+                    case SCO_DATA:
+                        mScoPacketsReceived += 1;
+                        break;
+                }
+                updateHciPacketCount();
+            }
+        });
+    }
+
+    public void run() throws IOException {
+        mServer.run();
+    }
+
+    private void updateHciPacketCount() {
+        mListener.onHciPacketCountChange(
+                mCommandPacketsReceived,
+                mAclPacketsReceived,
+                mScoPacketsReceived,
+                mEventPacketsSent,
+                mAclPacketsSent,
+                mScoPacketsSent
+        );
+    }
+
+    public interface Listener {
+        void onHostConnectionState(boolean connected);
+
+        void onHciPacketCountChange(
+                int commandPacketsReceived,
+                int aclPacketsReceived,
+                int scoPacketsReceived,
+                int eventPacketsSent,
+                int aclPacketsSent,
+                int scoPacketsSent
+        );
+
+        void onMessage(String message);
+    }
+
+    public static class HalException extends RuntimeException {
+        public final String message;
+        public HalException(String message) {
+            this.message = message;
+        }
+    }
+}

extras/android/RemoteHCI/app/src/main/java/com/github/google/bumble/remotehci/HciServer.java

@@ -0,0 +1,92 @@
+package com.github.google.bumble.remotehci;
+
+import android.util.Log;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+
+public class HciServer {
+    private static final String TAG = "HciServer";
+    private static final int BUFFER_SIZE = 1024;
+    private final int mPort;
+    private final Listener mListener;
+    private OutputStream mOutputStream;
+
+    public interface Listener extends HciParser.Sink {
+        void onHostConnectionState(boolean connected);
+        void onMessage(String message);
+    }
+
+    HciServer(int port, Listener listener) {
+        this.mPort = port;
+        this.mListener = listener;
+    }
+
+    public void run() throws IOException {
+        for (;;) {
+            try {
+                loop();
+            } catch (IOException error) {
+                mListener.onMessage("Cannot listen on port " + mPort);
+                return;
+            }
+        }
+    }
+
+    private void loop() throws IOException {
+        mListener.onHostConnectionState(false);
+        try (ServerSocket serverSocket = new ServerSocket(mPort)) {
+            mListener.onMessage("Waiting for connection on port " + serverSocket.getLocalPort());
+            try (Socket clientSocket = serverSocket.accept()) {
+                mListener.onHostConnectionState(true);
+                mListener.onMessage("Connected");
+                HciParser parser = new HciParser(mListener);
+                InputStream inputStream = clientSocket.getInputStream();
+                synchronized (this) {
+                    mOutputStream = clientSocket.getOutputStream();
+                }
+                byte[] buffer = new byte[BUFFER_SIZE];
+
+                try {
+                    for (; ; ) {
+                        int bytesRead = inputStream.read(buffer);
+                        if (bytesRead < 0) {
+                            Log.d(TAG, "end of stream");
+                            break;
+                        }
+                        parser.feedData(buffer, bytesRead);
+                    }
+                } catch (IOException error) {
+                    Log.d(TAG, "exception in read loop: " + error);
+                }
+            }
+        } finally {
+            synchronized (this) {
+                mOutputStream = null;
+            }
+        }
+    }
+
+    public void sendPacket(HciPacket.Type type, byte[] packet) {
+        // Create a combined data buffer so we can write it out in a single call.
+        byte[] data = new byte[packet.length + 1];
+        data[0] = type.value;
+        System.arraycopy(packet, 0, data, 1, packet.length);
+
+        synchronized (this) {
+            if (mOutputStream != null) {
+                try {
+                    mOutputStream.write(data);
+                } catch (IOException error) {
+                    Log.w(TAG, "failed to write packet: " + error);
+                }
+            } else {
+                Log.d(TAG, "no client, dropping packet");
+            }
+        }
+    }
+}

extras/android/RemoteHCI/app/src/main/java/com/github/google/bumble/remotehci/MainActivity.kt

@@ -0,0 +1,229 @@
+package com.github.google.bumble.remotehci
+
+import android.content.Context
+import android.content.SharedPreferences
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.text.KeyboardActions
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material3.Button
+import androidx.compose.material3.Divider
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextField
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.ExperimentalComposeUiApi
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalSoftwareKeyboardController
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.input.ImeAction
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.lifecycle.ViewModel
+import com.github.google.bumble.remotehci.HciProxy.HalException
+import com.github.google.bumble.remotehci.ui.theme.RemoteHCITheme
+import java.io.IOException
+import java.util.logging.Logger
+import kotlin.concurrent.thread
+
+const val DEFAULT_TCP_PORT = 9993
+const val TCP_PORT_PREF_KEY = "tcp_port"
+
+class AppViewModel : ViewModel(), HciProxy.Listener {
+    private var preferences: SharedPreferences? = null
+    var tcpPort by mutableStateOf(DEFAULT_TCP_PORT)
+    var canStart by mutableStateOf(true)
+    var message by mutableStateOf("")
+    var hostConnected by mutableStateOf(false)
+    var hciCommandPacketsReceived by mutableStateOf(0)
+    var hciAclPacketsReceived by mutableStateOf(0)
+    var hciScoPacketsReceived by mutableStateOf(0)
+    var hciEventPacketsSent by mutableStateOf(0)
+    var hciAclPacketsSent by mutableStateOf(0)
+    var hciScoPacketsSent by mutableStateOf(0)
+
+    fun loadPreferences(preferences: SharedPreferences) {
+        this.preferences = preferences
+        val savedTcpPortString = preferences.getString(TCP_PORT_PREF_KEY, null)
+        if (savedTcpPortString != null) {
+            val savedTcpPortInt = savedTcpPortString.toIntOrNull()
+            if (savedTcpPortInt != null) {
+                tcpPort = savedTcpPortInt
+            }
+        }
+    }
+
+    fun updateTcpPort(tcpPort: Int) {
+        this.tcpPort = tcpPort
+
+        // Save the port to the preferences
+        with (preferences!!.edit()) {
+            putString(TCP_PORT_PREF_KEY, tcpPort.toString())
+            apply()
+        }
+    }
+
+    override fun onHostConnectionState(connected: Boolean) {
+        hostConnected = connected
+    }
+
+    override fun onHciPacketCountChange(
+        commandPacketsReceived: Int,
+        aclPacketsReceived: Int,
+        scoPacketsReceived: Int,
+        eventPacketsSent: Int,
+        aclPacketsSent: Int,
+        scoPacketsSent: Int
+    ) {
+        hciCommandPacketsReceived = commandPacketsReceived
+        hciAclPacketsReceived = aclPacketsReceived
+        hciScoPacketsReceived = scoPacketsReceived
+        hciEventPacketsSent = eventPacketsSent
+        hciAclPacketsSent = aclPacketsSent
+        hciScoPacketsSent = scoPacketsSent
+
+    }
+
+    override fun onMessage(message: String) {
+        this.message = message
+    }
+}
+
+class MainActivity : ComponentActivity() {
+    private val log = Logger.getLogger(MainActivity::class.java.name)
+    private val appViewModel = AppViewModel()
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        appViewModel.loadPreferences(getPreferences(Context.MODE_PRIVATE))
+
+        val tcpPort = intent.getIntExtra("port", -1)
+        if (tcpPort >= 0) {
+            appViewModel.tcpPort = tcpPport
+        }
+
+        setContent {
+            MainView(appViewModel, ::startProxy)
+        }
+
+        if (intent.getBooleanExtra("autostart", false)) {
+            startProxy()
+        }
+    }
+
+    private fun startProxy() {
+        // Run the proxy in a thread.
+        appViewModel.message = ""
+        thread {
+            log.info("HCI Proxy thread starting")
+            appViewModel.canStart = false
+            try {
+                val hciProxy = HciProxy(appViewModel.tcpPort, appViewModel)
+                hciProxy.run()
+            } catch (error: IOException) {
+                log.warning("Exception while running HCI Server: $error")
+            } catch (error: HalException) {
+                log.warning("HAL exception: ${error.message}")
+                appViewModel.message = "Cannot bind to HAL (${error.message}). You may need to use the command 'setenforce 0' in a root adb shell."
+            }
+            log.info("HCI Proxy thread ended")
+            appViewModel.canStart = true
+        }
+    }
+}
+
+@Composable
+fun ActionButton(text: String, onClick: () -> Unit, enabled: Boolean) {
+    Button(onClick = onClick, enabled = enabled) {
+        Text(text = text)
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class, ExperimentalComposeUiApi::class)
+@Composable
+fun MainView(appViewModel: AppViewModel, startProxy: () -> Unit) {
+    RemoteHCITheme {
+        // A surface container using the 'background' color from the theme
+        Surface(
+            modifier = Modifier.fillMaxSize(), color = MaterialTheme.colorScheme.background
+        ) {
+            Column(modifier = Modifier.padding(horizontal = 16.dp)) {
+                Text(
+                    text = "Bumble Remote HCI",
+                    fontSize = 24.sp,
+                    fontWeight = FontWeight.Bold,
+                    textAlign = TextAlign.Center
+                )
+                Divider()
+                Text(
+                    text = appViewModel.message
+                )
+                Divider()
+                val keyboardController = LocalSoftwareKeyboardController.current
+                TextField(
+                    label = {
+                        Text(text = "TCP Port")
+                    },
+                    value = appViewModel.tcpPort.toString(),
+                    modifier = Modifier.fillMaxWidth(),
+                    keyboardOptions = KeyboardOptions.Default.copy(keyboardType = KeyboardType.Number, imeAction = ImeAction.Done),
+                    onValueChange = {
+                        if (it.isNotEmpty()) {
+                            val tcpPort = it.toIntOrNull()
+                            if (tcpPort != null) {
+                                appViewModel.updateTcpPort(tcpPort)
+                            }
+                        }
+                    },
+                    keyboardActions = KeyboardActions(
+                        onDone = {keyboardController?.hide()}
+                    )
+                )
+                Divider()
+                val connectState = if (appViewModel.hostConnected) "CONNECTED" else "DISCONNECTED"
+                Text(
+                    text = "HOST: $connectState",
+                    modifier = Modifier.background(color = if (appViewModel.hostConnected) Color.Green else Color.Red),
+                    color = Color.Black
+                )
+                Divider()
+                Text(
+                    text = "Command Packets Received: ${appViewModel.hciCommandPacketsReceived}"
+                )
+                Text(
+                    text = "ACL Packets Received: ${appViewModel.hciAclPacketsReceived}"
+                )
+                Text(
+                    text = "SCO Packets Received: ${appViewModel.hciScoPacketsReceived}"
+                )
+                Text(
+                    text = "Event Packets Sent: ${appViewModel.hciEventPacketsSent}"
+                )
+                Text(
+                    text = "ACL Packets Sent: ${appViewModel.hciAclPacketsSent}"
+                )
+                Text(
+                    text = "SCO Packets Sent: ${appViewModel.hciScoPacketsSent}"
+                )
+                Divider()
+                ActionButton(
+                    text = "Start", onClick = startProxy, enabled = appViewModel.canStart
+                )
+            }
+        }
+    }
+}

extras/android/RemoteHCI/app/src/main/java/com/github/google/bumble/remotehci/ui/theme/Color.kt

@@ -0,0 +1,11 @@
+package com.github.google.bumble.remotehci.ui.theme
+
+import androidx.compose.ui.graphics.Color
+
+val Purple80 = Color(0xFFD0BCFF)
+val PurpleGrey80 = Color(0xFFCCC2DC)
+val Pink80 = Color(0xFFEFB8C8)
+
+val Purple40 = Color(0xFF6650a4)
+val PurpleGrey40 = Color(0xFF625b71)
+val Pink40 = Color(0xFF7D5260)

extras/android/RemoteHCI/app/src/main/java/com/github/google/bumble/remotehci/ui/theme/Theme.kt

@@ -0,0 +1,70 @@
+package com.github.google.bumble.remotehci.ui.theme
+
+import android.app.Activity
+import android.os.Build
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.material3.dynamicDarkColorScheme
+import androidx.compose.material3.dynamicLightColorScheme
+import androidx.compose.material3.lightColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.SideEffect
+import androidx.compose.ui.graphics.toArgb
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalView
+import androidx.core.view.WindowCompat
+
+private val DarkColorScheme = darkColorScheme(
+    primary = Purple80,
+    secondary = PurpleGrey80,
+    tertiary = Pink80
+)
+
+private val LightColorScheme = lightColorScheme(
+    primary = Purple40,
+    secondary = PurpleGrey40,
+    tertiary = Pink40
+
+    /* Other default colors to override
+    background = Color(0xFFFFFBFE),
+    surface = Color(0xFFFFFBFE),
+    onPrimary = Color.White,
+    onSecondary = Color.White,
+    onTertiary = Color.White,
+    onBackground = Color(0xFF1C1B1F),
+    onSurface = Color(0xFF1C1B1F),
+    */
+)
+
+@Composable
+fun RemoteHCITheme(
+    darkTheme: Boolean = isSystemInDarkTheme(),
+    // Dynamic color is available on Android 12+
+    dynamicColor: Boolean = true,
+    content: @Composable () -> Unit
+) {
+    val colorScheme = when {
+        dynamicColor && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
+            val context = LocalContext.current
+            if (darkTheme) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context)
+        }
+
+        darkTheme -> DarkColorScheme
+        else -> LightColorScheme
+    }
+    val view = LocalView.current
+    if (!view.isInEditMode) {
+        SideEffect {
+            val window = (view.context as Activity).window
+            window.statusBarColor = colorScheme.primary.toArgb()
+            WindowCompat.getInsetsController(window, view).isAppearanceLightStatusBars = darkTheme
+        }
+    }
+
+    MaterialTheme(
+        colorScheme = colorScheme,
+        typography = Typography,
+        content = content
+    )
+}

extras/android/RemoteHCI/app/src/main/java/com/github/google/bumble/remotehci/ui/theme/Type.kt

@@ -0,0 +1,34 @@
+package com.github.google.bumble.remotehci.ui.theme
+
+import androidx.compose.material3.Typography
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.sp
+
+// Set of Material typography styles to start with
+val Typography = Typography(
+    bodyLarge = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Normal,
+        fontSize = 16.sp,
+        lineHeight = 24.sp,
+        letterSpacing = 0.5.sp
+    )
+    /* Other default text styles to override
+    titleLarge = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Normal,
+        fontSize = 22.sp,
+        lineHeight = 28.sp,
+        letterSpacing = 0.sp
+    ),
+    labelSmall = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Medium,
+        fontSize = 11.sp,
+        lineHeight = 16.sp,
+        letterSpacing = 0.5.sp
+    )
+    */
+)

extras/android/RemoteHCI/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>

extras/android/RemoteHCI/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>