better handling of complete/status events

fix a few HCI types and make the bridge more robust

.gitignore

@@ -17,3 +17,6 @@ venv/
 .venv/
 # snoop logs
 out/
+# macOS
+.DS_Store
+._*

apps/controller_info.py

@@ -27,23 +27,17 @@ from bumble.core import name_or_number
 from bumble.hci import (
     HCI_LE_READ_BUFFER_SIZE_COMMAND,
     HCI_LE_READ_BUFFER_SIZE_V2_COMMAND,
-    HCI_LE_READ_MAXIMUM_ADVERTISING_DATA_LENGTH_COMMAND,
     HCI_LE_READ_MAXIMUM_DATA_LENGTH_COMMAND,
-    HCI_LE_READ_NUMBER_OF_SUPPORTED_ADVERTISING_SETS_COMMAND,
+    HCI_LE_READ_MINIMUM_SUPPORTED_CONNECTION_INTERVAL_COMMAND,
     HCI_LE_READ_SUGGESTED_DEFAULT_DATA_LENGTH_COMMAND,
     HCI_READ_BD_ADDR_COMMAND,
     HCI_READ_BUFFER_SIZE_COMMAND,
     HCI_READ_LOCAL_NAME_COMMAND,
-    HCI_SUCCESS,
-    CodecID,
     HCI_Command,
-    HCI_Command_Complete_Event,
-    HCI_Command_Status_Event,
     HCI_LE_Read_Buffer_Size_Command,
     HCI_LE_Read_Buffer_Size_V2_Command,
-    HCI_LE_Read_Maximum_Advertising_Data_Length_Command,
     HCI_LE_Read_Maximum_Data_Length_Command,
-    HCI_LE_Read_Number_Of_Supported_Advertising_Sets_Command,
+    HCI_LE_Read_Minimum_Supported_Connection_Interval_Command,
     HCI_LE_Read_Suggested_Default_Data_Length_Command,
     HCI_Read_BD_ADDR_Command,
     HCI_Read_Buffer_Size_Command,
@@ -59,85 +53,81 @@ from bumble.host import Host
 from bumble.transport import open_transport
 
 
-# -----------------------------------------------------------------------------
-def command_succeeded(response):
-    if isinstance(response, HCI_Command_Status_Event):
-        return response.status == HCI_SUCCESS
-    if isinstance(response, HCI_Command_Complete_Event):
-        return response.return_parameters.status == HCI_SUCCESS
-    return False
-
-
 # -----------------------------------------------------------------------------
 async def get_classic_info(host: Host) -> None:
     if host.supports_command(HCI_READ_BD_ADDR_COMMAND):
-        response = await host.send_command(HCI_Read_BD_ADDR_Command())
+        response1 = await host.send_sync_command(HCI_Read_BD_ADDR_Command())
-        if command_succeeded(response):
+        print()
-            print()
+        print(
-            print(
+            color('Public Address:', 'yellow'),
-                color('Public Address:', 'yellow'),
+            response1.bd_addr.to_string(False),
-                response.return_parameters.bd_addr.to_string(False),
+        )
-            )
 
     if host.supports_command(HCI_READ_LOCAL_NAME_COMMAND):
-        response = await host.send_command(HCI_Read_Local_Name_Command())
+        response2 = await host.send_sync_command(HCI_Read_Local_Name_Command())
-        if command_succeeded(response):
+        print()
-            print()
+        print(
-            print(
+            color('Local Name:', 'yellow'),
-                color('Local Name:', 'yellow'),
+            map_null_terminated_utf8_string(response2.local_name),
-                map_null_terminated_utf8_string(response.return_parameters.local_name),
+        )
-            )
 
 
 # -----------------------------------------------------------------------------
 async def get_le_info(host: Host) -> None:
     print()
 
-    if host.supports_command(HCI_LE_READ_NUMBER_OF_SUPPORTED_ADVERTISING_SETS_COMMAND):
+    print(
-        response = await host.send_command(
+        color('LE Number Of Supported Advertising Sets:', 'yellow'),
-            HCI_LE_Read_Number_Of_Supported_Advertising_Sets_Command()
+        host.number_of_supported_advertising_sets,
-        )
+        '\n',
-        if command_succeeded(response):
+    )
-            print(
-                color('LE Number Of Supported Advertising Sets:', 'yellow'),
-                response.return_parameters.num_supported_advertising_sets,
-                '\n',
-            )
 
-    if host.supports_command(HCI_LE_READ_MAXIMUM_ADVERTISING_DATA_LENGTH_COMMAND):
+    print(
-        response = await host.send_command(
+        color('LE Maximum Advertising Data Length:', 'yellow'),
-            HCI_LE_Read_Maximum_Advertising_Data_Length_Command()
+        host.maximum_advertising_data_length,
-        )
+        '\n',
-        if command_succeeded(response):
+    )
-            print(
-                color('LE Maximum Advertising Data Length:', 'yellow'),
-                response.return_parameters.max_advertising_data_length,
-                '\n',
-            )
 
     if host.supports_command(HCI_LE_READ_MAXIMUM_DATA_LENGTH_COMMAND):
-        response = await host.send_command(HCI_LE_Read_Maximum_Data_Length_Command())
+        response1 = await host.send_sync_command(
-        if command_succeeded(response):
+            HCI_LE_Read_Maximum_Data_Length_Command()
-            print(
+        )
-                color('Maximum Data Length:', 'yellow'),
+        print(
-                (
+            color('LE Maximum Data Length:', 'yellow'),
-                    f'tx:{response.return_parameters.supported_max_tx_octets}/'
+            (
-                    f'{response.return_parameters.supported_max_tx_time}, '
+                f'tx:{response1.supported_max_tx_octets}/'
-                    f'rx:{response.return_parameters.supported_max_rx_octets}/'
+                f'{response1.supported_max_tx_time}, '
-                    f'{response.return_parameters.supported_max_rx_time}'
+                f'rx:{response1.supported_max_rx_octets}/'
-                ),
+                f'{response1.supported_max_rx_time}'
-                '\n',
+            ),
-            )
+        )
 
     if host.supports_command(HCI_LE_READ_SUGGESTED_DEFAULT_DATA_LENGTH_COMMAND):
-        response = await host.send_command(
+        response2 = await host.send_sync_command(
             HCI_LE_Read_Suggested_Default_Data_Length_Command()
         )
-        if command_succeeded(response):
+        print(
+            color('LE Suggested Default Data Length:', 'yellow'),
+            f'{response2.suggested_max_tx_octets}/'
+            f'{response2.suggested_max_tx_time}',
+            '\n',
+        )
+
+    if host.supports_command(HCI_LE_READ_MINIMUM_SUPPORTED_CONNECTION_INTERVAL_COMMAND):
+        response3 = await host.send_sync_command(
+            HCI_LE_Read_Minimum_Supported_Connection_Interval_Command()
+        )
+        print(
+            color('LE Minimum Supported Connection Interval:', 'yellow'),
+            f'{response3.minimum_supported_connection_interval * 125} µs',
+        )
+        for group in range(len(response3.group_min)):
             print(
-                color('Suggested Default Data Length:', 'yellow'),
+                f'  Group {group}: '
-                f'{response.return_parameters.suggested_max_tx_octets}/'
+                f'{response3.group_min[group] * 125} µs to '
-                f'{response.return_parameters.suggested_max_tx_time}',
+                f'{response3.group_max[group] * 125} µs '
+                'by increments of '
+                f'{response3.group_stride[group] * 125} µs',
                 '\n',
             )
 
@@ -151,37 +141,31 @@ async def get_flow_control_info(host: Host) -> None:
     print()
 
     if host.supports_command(HCI_READ_BUFFER_SIZE_COMMAND):
-        response = await host.send_command(
+        response1 = await host.send_sync_command(HCI_Read_Buffer_Size_Command())
-            HCI_Read_Buffer_Size_Command(), check_result=True
-        )
         print(
             color('ACL Flow Control:', 'yellow'),
-            f'{response.return_parameters.hc_total_num_acl_data_packets} '
+            f'{response1.hc_total_num_acl_data_packets} '
-            f'packets of size {response.return_parameters.hc_acl_data_packet_length}',
+            f'packets of size {response1.hc_acl_data_packet_length}',
         )
 
     if host.supports_command(HCI_LE_READ_BUFFER_SIZE_V2_COMMAND):
-        response = await host.send_command(
+        response2 = await host.send_sync_command(HCI_LE_Read_Buffer_Size_V2_Command())
-            HCI_LE_Read_Buffer_Size_V2_Command(), check_result=True
-        )
         print(
             color('LE ACL Flow Control:', 'yellow'),
-            f'{response.return_parameters.total_num_le_acl_data_packets} '
+            f'{response2.total_num_le_acl_data_packets} '
-            f'packets of size {response.return_parameters.le_acl_data_packet_length}',
+            f'packets of size {response2.le_acl_data_packet_length}',
         )
         print(
             color('LE ISO Flow Control:', 'yellow'),
-            f'{response.return_parameters.total_num_iso_data_packets} '
+            f'{response2.total_num_iso_data_packets} '
-            f'packets of size {response.return_parameters.iso_data_packet_length}',
+            f'packets of size {response2.iso_data_packet_length}',
         )
     elif host.supports_command(HCI_LE_READ_BUFFER_SIZE_COMMAND):
-        response = await host.send_command(
+        response3 = await host.send_sync_command(HCI_LE_Read_Buffer_Size_Command())
-            HCI_LE_Read_Buffer_Size_Command(), check_result=True
-        )
         print(
             color('LE ACL Flow Control:', 'yellow'),
-            f'{response.return_parameters.total_num_le_acl_data_packets} '
+            f'{response3.total_num_le_acl_data_packets} '
-            f'packets of size {response.return_parameters.le_acl_data_packet_length}',
+            f'packets of size {response3.le_acl_data_packet_length}',
         )
 
 
@@ -190,52 +174,44 @@ async def get_codecs_info(host: Host) -> None:
     print()
 
     if host.supports_command(HCI_Read_Local_Supported_Codecs_V2_Command.op_code):
-        response = await host.send_command(
+        response1 = await host.send_sync_command(
-            HCI_Read_Local_Supported_Codecs_V2_Command(), check_result=True
+            HCI_Read_Local_Supported_Codecs_V2_Command()
         )
         print(color('Codecs:', 'yellow'))
 
         for codec_id, transport in zip(
-            response.return_parameters.standard_codec_ids,
+            response1.standard_codec_ids,
-            response.return_parameters.standard_codec_transports,
+            response1.standard_codec_transports,
         ):
-            transport_name = HCI_Read_Local_Supported_Codecs_V2_Command.Transport(
+            print(f'  {codec_id.name} - {transport.name}')
-                transport
-            ).name
-            codec_name = CodecID(codec_id).name
-            print(f'  {codec_name} - {transport_name}')
 
-        for codec_id, transport in zip(
+        for vendor_codec_id, vendor_transport in zip(
-            response.return_parameters.vendor_specific_codec_ids,
+            response1.vendor_specific_codec_ids,
-            response.return_parameters.vendor_specific_codec_transports,
+            response1.vendor_specific_codec_transports,
         ):
-            transport_name = HCI_Read_Local_Supported_Codecs_V2_Command.Transport(
+            company = name_or_number(COMPANY_IDENTIFIERS, vendor_codec_id >> 16)
-                transport
+            print(f'  {company} / {vendor_codec_id & 0xFFFF} - {vendor_transport.name}')
-            ).name
-            company = name_or_number(COMPANY_IDENTIFIERS, codec_id >> 16)
-            print(f'  {company} / {codec_id & 0xFFFF} - {transport_name}')
 
-        if not response.return_parameters.standard_codec_ids:
+        if not response1.standard_codec_ids:
             print('  No standard codecs')
-        if not response.return_parameters.vendor_specific_codec_ids:
+        if not response1.vendor_specific_codec_ids:
             print('  No Vendor-specific codecs')
 
     if host.supports_command(HCI_Read_Local_Supported_Codecs_Command.op_code):
-        response = await host.send_command(
+        response2 = await host.send_sync_command(
-            HCI_Read_Local_Supported_Codecs_Command(), check_result=True
+            HCI_Read_Local_Supported_Codecs_Command()
         )
         print(color('Codecs (BR/EDR):', 'yellow'))
-        for codec_id in response.return_parameters.standard_codec_ids:
+        for codec_id in response2.standard_codec_ids:
-            codec_name = CodecID(codec_id).name
+            print(f'  {codec_id.name}')
-            print(f'  {codec_name}')
 
-        for codec_id in response.return_parameters.vendor_specific_codec_ids:
+        for vendor_codec_id in response2.vendor_specific_codec_ids:
-            company = name_or_number(COMPANY_IDENTIFIERS, codec_id >> 16)
+            company = name_or_number(COMPANY_IDENTIFIERS, vendor_codec_id >> 16)
-            print(f'  {company} / {codec_id & 0xFFFF}')
+            print(f'  {company} / {vendor_codec_id & 0xFFFF}')
 
-        if not response.return_parameters.standard_codec_ids:
+        if not response2.standard_codec_ids:
             print('  No standard codecs')
-        if not response.return_parameters.vendor_specific_codec_ids:
+        if not response2.vendor_specific_codec_ids:
             print('  No Vendor-specific codecs')
 
 

apps/controller_loopback.py

@@ -85,7 +85,7 @@ class Loopback:
             print(color('@@@ Received last packet', 'green'))
             self.done.set()
 
-    async def run(self):
+    async def run(self) -> None:
         """Run a loopback throughput test"""
         print(color('>>> Connecting to HCI...', 'green'))
         async with await open_transport(self.transport) as (
@@ -100,11 +100,15 @@ class Loopback:
             # make sure data can fit in one l2cap pdu
             l2cap_header_size = 4
 
-            max_packet_size = (
+            packet_queue = (
                 host.acl_packet_queue
                 if host.acl_packet_queue
                 else host.le_acl_packet_queue
-            ).max_packet_size - l2cap_header_size
+            )
+            if packet_queue is None:
+                print(color('!!! No packet queue', 'red'))
+                return
+            max_packet_size = packet_queue.max_packet_size - l2cap_header_size
             if self.packet_size > max_packet_size:
                 print(
                     color(
@@ -128,20 +132,18 @@ class Loopback:
             loopback_mode = LoopbackMode.LOCAL
 
             print(color('### Setting loopback mode', 'blue'))
-            await host.send_command(
+            await host.send_sync_command(
                 HCI_Write_Loopback_Mode_Command(loopback_mode=LoopbackMode.LOCAL),
-                check_result=True,
             )
 
             print(color('### Checking loopback mode', 'blue'))
-            response = await host.send_command(
+            response = await host.send_sync_command(HCI_Read_Loopback_Mode_Command())
-                HCI_Read_Loopback_Mode_Command(), check_result=True
+            if response.loopback_mode != loopback_mode:
-            )
-            if response.return_parameters.loopback_mode != loopback_mode:
                 print(color('!!! Loopback mode mismatch', 'red'))
                 return
 
             await self.connection_event.wait()
+            assert self.connection_handle is not None
             print(color('### Connected', 'cyan'))
 
             print(color('=== Start sending', 'magenta'))

apps/gg_bridge.py

@@ -352,7 +352,7 @@ async def run(
         await bridge.start()
 
         # Wait until the source terminates
-        await hci_source.wait_for_termination()
+        await hci_source.terminated
 
 
 @click.command()

apps/hci_bridge.py

@@ -81,7 +81,9 @@ async def async_main():
                     response = hci.HCI_Command_Complete_Event(
                         num_hci_command_packets=1,
                         command_opcode=hci_packet.op_code,
-                        return_parameters=bytes([hci.HCI_SUCCESS]),
+                        return_parameters=hci.HCI_StatusReturnParameters(
+                            status=hci.HCI_ErrorCode.SUCCESS
+                        ),
                     )
                     # Return a packet with 'respond to sender' set to True
                     return (bytes(response), True)

apps/l2cap_bridge.py

@@ -268,7 +268,7 @@ async def run(device_config, hci_transport, bridge):
         await bridge.start(device)
 
         # Wait until the transport terminates
-        await hci_source.wait_for_termination()
+        await hci_source.terminated
 
 
 # -----------------------------------------------------------------------------

apps/rfcomm_bridge.py

@@ -421,7 +421,7 @@ async def run(device_config, hci_transport, bridge):
             await bridge.start(device)
 
             # Wait until the transport terminates
-            await hci_source.wait_for_termination()
+            await hci_source.terminated
         except core.ConnectionError as error:
             print(color(f"!!! Bluetooth connection failed: {error}", "red"))
         except Exception as error:

apps/scan.py

@@ -22,7 +22,7 @@ import click
 import bumble.logging
 from bumble import data_types
 from bumble.colors import color
-from bumble.device import Advertisement, Device
+from bumble.device import Advertisement, Device, DeviceConfiguration
 from bumble.hci import HCI_LE_1M_PHY, HCI_LE_CODED_PHY, Address, HCI_Constant
 from bumble.keys import JsonKeyStore
 from bumble.smp import AddressResolver
@@ -144,8 +144,14 @@ async def scan(
                 device_config, hci_source, hci_sink
             )
         else:
-            device = Device.with_hci(
+            device = Device.from_config_with_hci(
-                'Bumble', 'F0:F1:F2:F3:F4:F5', hci_source, hci_sink
+                DeviceConfiguration(
+                    name='Bumble',
+                    address=Address('F0:F1:F2:F3:F4:F5'),
+                    keystore='JsonKeyStore',
+                ),
+                hci_source,
+                hci_sink,
             )
 
         await device.power_on()
@@ -190,7 +196,7 @@ async def scan(
             scanning_phys=scanning_phys,
         )
 
-        await hci_source.wait_for_termination()
+        await hci_source.terminated
 
 
 # -----------------------------------------------------------------------------

apps/speaker/speaker.py

@@ -726,7 +726,7 @@ class Speaker:
                 print("Waiting for connection...")
                 await self.advertise()
 
-            await hci_source.wait_for_termination()
+            await hci_source.terminated
 
         for output in self.outputs:
             await output.stop()

apps/usb_probe.py

@@ -26,6 +26,8 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+from typing import Any
+
 import click
 import usb1
 
@@ -166,13 +168,16 @@ def is_bluetooth_hci(device):
 # -----------------------------------------------------------------------------
 @click.command()
 @click.option('--verbose', is_flag=True, default=False, help='Print more details')
-def main(verbose):
+@click.option('--hci-only', is_flag=True, default=False, help='only show HCI device')
+@click.option('--manufacturer', help='filter by manufacturer')
+@click.option('--product', help='filter by product')
+def main(verbose: bool, manufacturer: str, product: str, hci_only: bool):
     bumble.logging.setup_basic_logging('WARNING')
 
     load_libusb()
     with usb1.USBContext() as context:
         bluetooth_device_count = 0
-        devices = {}
+        devices: dict[tuple[Any, Any], list[str | None]] = {}
 
         for device in context.getDeviceIterator(skip_on_error=True):
             device_class = device.getDeviceClass()
@@ -234,6 +239,14 @@ def main(verbose):
                         f'{basic_transport_name}/{device_serial_number}'
                     )
 
+            # Filter
+            if product and device_product != product:
+                continue
+            if manufacturer and device_manufacturer != manufacturer:
+                continue
+            if not is_bluetooth_hci(device) and hci_only:
+                continue
+
             # Print the results
             print(
                 color(

bumble/att.py

@@ -29,7 +29,7 @@ import enum
 import functools
 import inspect
 import struct
-from collections.abc import Awaitable, Callable
+from collections.abc import Awaitable, Callable, Sequence
 from typing import (
     TYPE_CHECKING,
     ClassVar,
@@ -72,34 +72,36 @@ ATT_PSM = 0x001F
 EATT_PSM = 0x0027
 
 class Opcode(hci.SpecableEnum):
-    ATT_ERROR_RESPONSE              = 0x01
+    ATT_ERROR_RESPONSE                  = 0x01
-    ATT_EXCHANGE_MTU_REQUEST        = 0x02
+    ATT_EXCHANGE_MTU_REQUEST            = 0x02
-    ATT_EXCHANGE_MTU_RESPONSE       = 0x03
+    ATT_EXCHANGE_MTU_RESPONSE           = 0x03
-    ATT_FIND_INFORMATION_REQUEST    = 0x04
+    ATT_FIND_INFORMATION_REQUEST        = 0x04
-    ATT_FIND_INFORMATION_RESPONSE   = 0x05
+    ATT_FIND_INFORMATION_RESPONSE       = 0x05
-    ATT_FIND_BY_TYPE_VALUE_REQUEST  = 0x06
+    ATT_FIND_BY_TYPE_VALUE_REQUEST      = 0x06
-    ATT_FIND_BY_TYPE_VALUE_RESPONSE = 0x07
+    ATT_FIND_BY_TYPE_VALUE_RESPONSE     = 0x07
-    ATT_READ_BY_TYPE_REQUEST        = 0x08
+    ATT_READ_BY_TYPE_REQUEST            = 0x08
-    ATT_READ_BY_TYPE_RESPONSE       = 0x09
+    ATT_READ_BY_TYPE_RESPONSE           = 0x09
-    ATT_READ_REQUEST                = 0x0A
+    ATT_READ_REQUEST                    = 0x0A
-    ATT_READ_RESPONSE               = 0x0B
+    ATT_READ_RESPONSE                   = 0x0B
-    ATT_READ_BLOB_REQUEST           = 0x0C
+    ATT_READ_BLOB_REQUEST               = 0x0C
-    ATT_READ_BLOB_RESPONSE          = 0x0D
+    ATT_READ_BLOB_RESPONSE              = 0x0D
-    ATT_READ_MULTIPLE_REQUEST       = 0x0E
+    ATT_READ_MULTIPLE_REQUEST           = 0x0E
-    ATT_READ_MULTIPLE_RESPONSE      = 0x0F
+    ATT_READ_MULTIPLE_RESPONSE          = 0x0F
-    ATT_READ_BY_GROUP_TYPE_REQUEST  = 0x10
+    ATT_READ_BY_GROUP_TYPE_REQUEST      = 0x10
-    ATT_READ_BY_GROUP_TYPE_RESPONSE = 0x11
+    ATT_READ_BY_GROUP_TYPE_RESPONSE     = 0x11
-    ATT_WRITE_REQUEST               = 0x12
+    ATT_READ_MULTIPLE_VARIABLE_REQUEST  = 0x20
-    ATT_WRITE_RESPONSE              = 0x13
+    ATT_READ_MULTIPLE_VARIABLE_RESPONSE = 0x21
-    ATT_WRITE_COMMAND               = 0x52
+    ATT_WRITE_REQUEST                   = 0x12
-    ATT_SIGNED_WRITE_COMMAND        = 0xD2
+    ATT_WRITE_RESPONSE                  = 0x13
-    ATT_PREPARE_WRITE_REQUEST       = 0x16
+    ATT_WRITE_COMMAND                   = 0x52
-    ATT_PREPARE_WRITE_RESPONSE      = 0x17
+    ATT_SIGNED_WRITE_COMMAND            = 0xD2
-    ATT_EXECUTE_WRITE_REQUEST       = 0x18
+    ATT_PREPARE_WRITE_REQUEST           = 0x16
-    ATT_EXECUTE_WRITE_RESPONSE      = 0x19
+    ATT_PREPARE_WRITE_RESPONSE          = 0x17
-    ATT_HANDLE_VALUE_NOTIFICATION   = 0x1B
+    ATT_EXECUTE_WRITE_REQUEST           = 0x18
-    ATT_HANDLE_VALUE_INDICATION     = 0x1D
+    ATT_EXECUTE_WRITE_RESPONSE          = 0x19
-    ATT_HANDLE_VALUE_CONFIRMATION   = 0x1E
+    ATT_HANDLE_VALUE_NOTIFICATION       = 0x1B
+    ATT_HANDLE_VALUE_INDICATION         = 0x1D
+    ATT_HANDLE_VALUE_CONFIRMATION       = 0x1E
 
 ATT_REQUESTS = [
     Opcode.ATT_EXCHANGE_MTU_REQUEST,
@@ -110,9 +112,10 @@ ATT_REQUESTS = [
     Opcode.ATT_READ_BLOB_REQUEST,
     Opcode.ATT_READ_MULTIPLE_REQUEST,
     Opcode.ATT_READ_BY_GROUP_TYPE_REQUEST,
+    Opcode.ATT_READ_MULTIPLE_VARIABLE_REQUEST,
     Opcode.ATT_WRITE_REQUEST,
     Opcode.ATT_PREPARE_WRITE_REQUEST,
-    Opcode.ATT_EXECUTE_WRITE_REQUEST
+    Opcode.ATT_EXECUTE_WRITE_REQUEST,
 ]
 
 ATT_RESPONSES = [
@@ -125,9 +128,10 @@ ATT_RESPONSES = [
     Opcode.ATT_READ_BLOB_RESPONSE,
     Opcode.ATT_READ_MULTIPLE_RESPONSE,
     Opcode.ATT_READ_BY_GROUP_TYPE_RESPONSE,
+    Opcode.ATT_READ_MULTIPLE_VARIABLE_RESPONSE,
     Opcode.ATT_WRITE_RESPONSE,
     Opcode.ATT_PREPARE_WRITE_RESPONSE,
-    Opcode.ATT_EXECUTE_WRITE_RESPONSE
+    Opcode.ATT_EXECUTE_WRITE_RESPONSE,
 ]
 
 class ErrorCode(hci.SpecableEnum):
@@ -185,6 +189,18 @@ ATT_INSUFFICIENT_RESOURCES_ERROR           = ErrorCode.INSUFFICIENT_RESOURCES
 ATT_DEFAULT_MTU = 23
 
 HANDLE_FIELD_SPEC    = {'size': 2, 'mapper': lambda x: f'0x{x:04X}'}
+_SET_OF_HANDLES_METADATA = hci.metadata({
+                'parser': lambda data, offset: (
+                    len(data),
+                    [
+                        struct.unpack_from('<H', data, i)[0]
+                        for i in range(offset, len(data), 2)
+                    ],
+                ),
+                'serializer': lambda handles: b''.join(
+                    [struct.pack('<H', handle) for handle in handles]
+                ),
+            })
 
 # fmt: on
 # pylint: enable=line-too-long
@@ -554,7 +570,7 @@ class ATT_Read_Multiple_Request(ATT_PDU):
     See Bluetooth spec @ Vol 3, Part F - 3.4.4.7 Read Multiple Request
     '''
 
-    set_of_handles: bytes = dataclasses.field(metadata=hci.metadata("*"))
+    set_of_handles: Sequence[int] = dataclasses.field(metadata=_SET_OF_HANDLES_METADATA)
 
 
 # -----------------------------------------------------------------------------
@@ -635,6 +651,55 @@ class ATT_Read_By_Group_Type_Response(ATT_PDU):
         return result
 
 
+# -----------------------------------------------------------------------------
+@ATT_PDU.subclass
+@dataclasses.dataclass
+class ATT_Read_Multiple_Variable_Request(ATT_PDU):
+    '''
+    See Bluetooth spec @ Vol 3, Part F - 3.4.4.11 Read Multiple Variable Request
+    '''
+
+    set_of_handles: Sequence[int] = dataclasses.field(metadata=_SET_OF_HANDLES_METADATA)
+
+
+# -----------------------------------------------------------------------------
+@ATT_PDU.subclass
+@dataclasses.dataclass
+class ATT_Read_Multiple_Variable_Response(ATT_PDU):
+    '''
+    See Bluetooth spec @ Vol 3, Part F - 3.4.4.12 Read Multiple Variable Response
+    '''
+
+    @classmethod
+    def _parse_length_value_tuples(
+        cls, data: bytes, offset: int
+    ) -> tuple[int, list[tuple[int, bytes]]]:
+        length_value_tuple_list: list[tuple[int, bytes]] = []
+        while offset < len(data):
+            length = struct.unpack_from('<H', data, offset)[0]
+            length_value_tuple_list.append(
+                (length, data[offset + 2 : offset + 2 + length])
+            )
+            offset += 2 + length
+        return (len(data), length_value_tuple_list)
+
+    length_value_tuple_list: Sequence[tuple[int, bytes]] = dataclasses.field(
+        metadata=hci.metadata(
+            {
+                'parser': lambda data, offset: ATT_Read_Multiple_Variable_Response._parse_length_value_tuples(
+                    data, offset
+                ),
+                'serializer': lambda length_value_tuple_list: b''.join(
+                    [
+                        struct.pack('<H', length) + value
+                        for length, value in length_value_tuple_list
+                    ]
+                ),
+            }
+        )
+    )
+
+
 # -----------------------------------------------------------------------------
 @ATT_PDU.subclass
 @dataclasses.dataclass

bumble/avctp.py

@@ -235,7 +235,7 @@ class Protocol:
             )
             + payload
         )
-        self.l2cap_channel.send_pdu(pdu)
+        self.l2cap_channel.write(pdu)
 
     def send_command(self, transaction_label: int, pid: int, payload: bytes) -> None:
         logger.debug(

bumble/avdtp.py

@@ -268,7 +268,7 @@ class MediaPacketPump:
                         await self.clock.sleep(delay)
 
                     # Emit
-                    rtp_channel.send_pdu(bytes(packet))
+                    rtp_channel.write(bytes(packet))
                     logger.debug(
                         f'{color(">>> sending RTP packet:", "green")} {packet}'
                     )
@@ -1519,7 +1519,7 @@ class Protocol(utils.EventEmitter):
                 header = bytes([first_header_byte])
 
             # Send one packet
-            self.l2cap_channel.send_pdu(header + payload[:max_fragment_size])
+            self.l2cap_channel.write(header + payload[:max_fragment_size])
 
             # Prepare for the next packet
             payload = payload[max_fragment_size:]
@@ -1829,7 +1829,7 @@ class Stream:
 
     def send_media_packet(self, packet: MediaPacket) -> None:
         assert self.rtp_channel
-        self.rtp_channel.send_pdu(bytes(packet))
+        self.rtp_channel.write(bytes(packet))
 
     async def configure(self) -> None:
         if self.state != State.IDLE:

bumble/avrcp.py

@@ -26,7 +26,7 @@ from collections.abc import AsyncIterator, Awaitable, Callable, Iterable, Sequen
 from dataclasses import dataclass, field
 from typing import ClassVar, SupportsBytes, TypeVar
 
-from bumble import avc, avctp, core, hci, l2cap, utils
+from bumble import avc, avctp, core, hci, l2cap, sdp, utils
 from bumble.colors import color
 from bumble.device import Connection, Device
 from bumble.sdp import (
@@ -55,13 +55,15 @@ AVRCP_PID = 0x110E
 AVRCP_BLUETOOTH_SIG_COMPANY_ID = 0x001958
 
 
-_UINT64_BE_METADATA = {
+_UINT64_BE_METADATA = hci.metadata(
-    'parser': lambda data, offset: (
+    {
-        offset + 8,
+        'parser': lambda data, offset: (
-        int.from_bytes(data[offset : offset + 8], byteorder='big'),
+            offset + 8,
-    ),
+            int.from_bytes(data[offset : offset + 8], byteorder='big'),
-    'serializer': lambda x: x.to_bytes(8, byteorder='big'),
+        ),
-}
+        'serializer': lambda x: x.to_bytes(8, byteorder='big'),
+    }
+)
 
 
 class PduId(utils.OpenIntEnum):
@@ -92,7 +94,7 @@ class PduId(utils.OpenIntEnum):
 
 
 class CharacterSetId(hci.SpecableEnum):
-    UTF_8 = 0x06
+    UTF_8 = 0x6A
 
 
 class MediaAttributeId(hci.SpecableEnum):
@@ -192,82 +194,43 @@ class TargetFeatures(enum.IntFlag):
 
 
 # -----------------------------------------------------------------------------
-def make_controller_service_sdp_records(
+@dataclass
-    service_record_handle: int,
+class ControllerServiceSdpRecord:
-    avctp_version: tuple[int, int] = (1, 4),
+    service_record_handle: int
-    avrcp_version: tuple[int, int] = (1, 6),
+    avctp_version: tuple[int, int] = (1, 4)
-    supported_features: int | ControllerFeatures = 1,
+    avrcp_version: tuple[int, int] = (1, 6)
-) -> list[ServiceAttribute]:
+    supported_features: int | ControllerFeatures = ControllerFeatures(1)
-    avctp_version_int = avctp_version[0] << 8 | avctp_version[1]
-    avrcp_version_int = avrcp_version[0] << 8 | avrcp_version[1]
 
-    attributes = [
+    def to_service_attributes(self) -> list[ServiceAttribute]:
-        ServiceAttribute(
+        avctp_version_int = self.avctp_version[0] << 8 | self.avctp_version[1]
-            SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
+        avrcp_version_int = self.avrcp_version[0] << 8 | self.avrcp_version[1]
-            DataElement.unsigned_integer_32(service_record_handle),
+
-        ),
+        attributes = [
-        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(core.BT_AV_REMOTE_CONTROL_SERVICE),
-                    DataElement.uuid(core.BT_AV_REMOTE_CONTROL_CONTROLLER_SERVICE),
-                ]
-            ),
-        ),
-        ServiceAttribute(
-            SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
-            DataElement.sequence(
-                [
-                    DataElement.sequence(
-                        [
-                            DataElement.uuid(core.BT_L2CAP_PROTOCOL_ID),
-                            DataElement.unsigned_integer_16(avctp.AVCTP_PSM),
-                        ]
-                    ),
-                    DataElement.sequence(
-                        [
-                            DataElement.uuid(core.BT_AVCTP_PROTOCOL_ID),
-                            DataElement.unsigned_integer_16(avctp_version_int),
-                        ]
-                    ),
-                ]
-            ),
-        ),
-        ServiceAttribute(
-            SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
-            DataElement.sequence(
-                [
-                    DataElement.sequence(
-                        [
-                            DataElement.uuid(core.BT_AV_REMOTE_CONTROL_SERVICE),
-                            DataElement.unsigned_integer_16(avrcp_version_int),
-                        ]
-                    ),
-                ]
-            ),
-        ),
-        ServiceAttribute(
-            SDP_SUPPORTED_FEATURES_ATTRIBUTE_ID,
-            DataElement.unsigned_integer_16(supported_features),
-        ),
-    ]
-    if supported_features & ControllerFeatures.SUPPORTS_BROWSING:
-        attributes.append(
             ServiceAttribute(
-                SDP_ADDITIONAL_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+                SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
+                DataElement.unsigned_integer_32(self.service_record_handle),
+            ),
+            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(core.BT_AV_REMOTE_CONTROL_SERVICE),
+                        DataElement.uuid(core.BT_AV_REMOTE_CONTROL_CONTROLLER_SERVICE),
+                    ]
+                ),
+            ),
+            ServiceAttribute(
+                SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
                 DataElement.sequence(
                     [
                         DataElement.sequence(
                             [
                                 DataElement.uuid(core.BT_L2CAP_PROTOCOL_ID),
-                                DataElement.unsigned_integer_16(
+                                DataElement.unsigned_integer_16(avctp.AVCTP_PSM),
-                                    avctp.AVCTP_BROWSING_PSM
-                                ),
                             ]
                         ),
                         DataElement.sequence(
@@ -279,87 +242,130 @@ def make_controller_service_sdp_records(
                     ]
                 ),
             ),
-        )
+            ServiceAttribute(
-    return attributes
+                SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+                DataElement.sequence(
+                    [
+                        DataElement.sequence(
+                            [
+                                DataElement.uuid(core.BT_AV_REMOTE_CONTROL_SERVICE),
+                                DataElement.unsigned_integer_16(avrcp_version_int),
+                            ]
+                        ),
+                    ]
+                ),
+            ),
+            ServiceAttribute(
+                SDP_SUPPORTED_FEATURES_ATTRIBUTE_ID,
+                DataElement.unsigned_integer_16(self.supported_features),
+            ),
+        ]
+        if self.supported_features & ControllerFeatures.SUPPORTS_BROWSING:
+            attributes.append(
+                ServiceAttribute(
+                    SDP_ADDITIONAL_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+                    DataElement.sequence(
+                        [
+                            DataElement.sequence(
+                                [
+                                    DataElement.uuid(core.BT_L2CAP_PROTOCOL_ID),
+                                    DataElement.unsigned_integer_16(
+                                        avctp.AVCTP_BROWSING_PSM
+                                    ),
+                                ]
+                            ),
+                            DataElement.sequence(
+                                [
+                                    DataElement.uuid(core.BT_AVCTP_PROTOCOL_ID),
+                                    DataElement.unsigned_integer_16(avctp_version_int),
+                                ]
+                            ),
+                        ]
+                    ),
+                ),
+            )
+        return attributes
+
+    @classmethod
+    async def find(cls, connection: Connection) -> list[ControllerServiceSdpRecord]:
+        async with sdp.Client(connection) as sdp_client:
+            search_result = await sdp_client.search_attributes(
+                uuids=[core.BT_AV_REMOTE_CONTROL_CONTROLLER_SERVICE],
+                attribute_ids=[
+                    SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
+                    SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+                    SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+                    SDP_SUPPORTED_FEATURES_ATTRIBUTE_ID,
+                ],
+            )
+
+            records: list[ControllerServiceSdpRecord] = []
+            for attribute_lists in search_result:
+                record = cls(0)
+                for attribute in attribute_lists:
+                    if attribute.id == SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID:
+                        record.service_record_handle = attribute.value.value
+                    elif attribute.id == SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID:
+                        # [[L2CAP, PSM], [AVCTP, version]]
+                        record.avctp_version = (
+                            attribute.value.value[1].value[1].value >> 8,
+                            attribute.value.value[1].value[1].value & 0xFF,
+                        )
+                    elif (
+                        attribute.id
+                        == SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID
+                    ):
+                        # [[AV_REMOTE_CONTROL, version]]
+                        record.avrcp_version = (
+                            attribute.value.value[0].value[1].value >> 8,
+                            attribute.value.value[0].value[1].value & 0xFF,
+                        )
+                    elif attribute.id == SDP_SUPPORTED_FEATURES_ATTRIBUTE_ID:
+                        record.supported_features = ControllerFeatures(
+                            attribute.value.value
+                        )
+                records.append(record)
+            return records
 
 
 # -----------------------------------------------------------------------------
-def make_target_service_sdp_records(
+@dataclass
-    service_record_handle: int,
+class TargetServiceSdpRecord:
-    avctp_version: tuple[int, int] = (1, 4),
+    service_record_handle: int
-    avrcp_version: tuple[int, int] = (1, 6),
+    avctp_version: tuple[int, int] = (1, 4)
-    supported_features: int | TargetFeatures = 0x23,
+    avrcp_version: tuple[int, int] = (1, 6)
-) -> list[ServiceAttribute]:
+    supported_features: int | TargetFeatures = TargetFeatures(0x23)
-    # TODO: support a way to compute the supported features from a feature list
-    avctp_version_int = avctp_version[0] << 8 | avctp_version[1]
-    avrcp_version_int = avrcp_version[0] << 8 | avrcp_version[1]
 
-    attributes = [
+    def to_service_attributes(self) -> list[ServiceAttribute]:
-        ServiceAttribute(
+        # TODO: support a way to compute the supported features from a feature list
-            SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
+        avctp_version_int = self.avctp_version[0] << 8 | self.avctp_version[1]
-            DataElement.unsigned_integer_32(service_record_handle),
+        avrcp_version_int = self.avrcp_version[0] << 8 | self.avrcp_version[1]
-        ),
+
-        ServiceAttribute(
+        attributes = [
-            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(core.BT_AV_REMOTE_CONTROL_TARGET_SERVICE),
-                ]
-            ),
-        ),
-        ServiceAttribute(
-            SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
-            DataElement.sequence(
-                [
-                    DataElement.sequence(
-                        [
-                            DataElement.uuid(core.BT_L2CAP_PROTOCOL_ID),
-                            DataElement.unsigned_integer_16(avctp.AVCTP_PSM),
-                        ]
-                    ),
-                    DataElement.sequence(
-                        [
-                            DataElement.uuid(core.BT_AVCTP_PROTOCOL_ID),
-                            DataElement.unsigned_integer_16(avctp_version_int),
-                        ]
-                    ),
-                ]
-            ),
-        ),
-        ServiceAttribute(
-            SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
-            DataElement.sequence(
-                [
-                    DataElement.sequence(
-                        [
-                            DataElement.uuid(core.BT_AV_REMOTE_CONTROL_SERVICE),
-                            DataElement.unsigned_integer_16(avrcp_version_int),
-                        ]
-                    ),
-                ]
-            ),
-        ),
-        ServiceAttribute(
-            SDP_SUPPORTED_FEATURES_ATTRIBUTE_ID,
-            DataElement.unsigned_integer_16(supported_features),
-        ),
-    ]
-    if supported_features & TargetFeatures.SUPPORTS_BROWSING:
-        attributes.append(
             ServiceAttribute(
-                SDP_ADDITIONAL_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+                SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
+                DataElement.unsigned_integer_32(self.service_record_handle),
+            ),
+            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(core.BT_AV_REMOTE_CONTROL_TARGET_SERVICE),
+                    ]
+                ),
+            ),
+            ServiceAttribute(
+                SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
                 DataElement.sequence(
                     [
                         DataElement.sequence(
                             [
                                 DataElement.uuid(core.BT_L2CAP_PROTOCOL_ID),
-                                DataElement.unsigned_integer_16(
+                                DataElement.unsigned_integer_16(avctp.AVCTP_PSM),
-                                    avctp.AVCTP_BROWSING_PSM
-                                ),
                             ]
                         ),
                         DataElement.sequence(
@@ -371,8 +377,90 @@ def make_target_service_sdp_records(
                     ]
                 ),
             ),
-        )
+            ServiceAttribute(
-    return attributes
+                SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+                DataElement.sequence(
+                    [
+                        DataElement.sequence(
+                            [
+                                DataElement.uuid(core.BT_AV_REMOTE_CONTROL_SERVICE),
+                                DataElement.unsigned_integer_16(avrcp_version_int),
+                            ]
+                        ),
+                    ]
+                ),
+            ),
+            ServiceAttribute(
+                SDP_SUPPORTED_FEATURES_ATTRIBUTE_ID,
+                DataElement.unsigned_integer_16(self.supported_features),
+            ),
+        ]
+        if self.supported_features & TargetFeatures.SUPPORTS_BROWSING:
+            attributes.append(
+                ServiceAttribute(
+                    SDP_ADDITIONAL_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+                    DataElement.sequence(
+                        [
+                            DataElement.sequence(
+                                [
+                                    DataElement.uuid(core.BT_L2CAP_PROTOCOL_ID),
+                                    DataElement.unsigned_integer_16(
+                                        avctp.AVCTP_BROWSING_PSM
+                                    ),
+                                ]
+                            ),
+                            DataElement.sequence(
+                                [
+                                    DataElement.uuid(core.BT_AVCTP_PROTOCOL_ID),
+                                    DataElement.unsigned_integer_16(avctp_version_int),
+                                ]
+                            ),
+                        ]
+                    ),
+                ),
+            )
+        return attributes
+
+    @classmethod
+    async def find(cls, connection: Connection) -> list[TargetServiceSdpRecord]:
+        async with sdp.Client(connection) as sdp_client:
+            search_result = await sdp_client.search_attributes(
+                uuids=[core.BT_AV_REMOTE_CONTROL_TARGET_SERVICE],
+                attribute_ids=[
+                    SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
+                    SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+                    SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+                    SDP_SUPPORTED_FEATURES_ATTRIBUTE_ID,
+                ],
+            )
+
+            records: list[TargetServiceSdpRecord] = []
+            for attribute_lists in search_result:
+                record = cls(0)
+                for attribute in attribute_lists:
+                    if attribute.id == SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID:
+                        record.service_record_handle = attribute.value.value
+                    elif attribute.id == SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID:
+                        # [[L2CAP, PSM], [AVCTP, version]]
+                        record.avctp_version = (
+                            attribute.value.value[1].value[1].value >> 8,
+                            attribute.value.value[1].value[1].value & 0xFF,
+                        )
+                    elif (
+                        attribute.id
+                        == SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID
+                    ):
+                        # [[AV_REMOTE_CONTROL, version]]
+                        record.avrcp_version = (
+                            attribute.value.value[0].value[1].value >> 8,
+                            attribute.value.value[0].value[1].value & 0xFF,
+                        )
+                    elif attribute.id == SDP_SUPPORTED_FEATURES_ATTRIBUTE_ID:
+                        record.supported_features = TargetFeatures(
+                            attribute.value.value
+                        )
+                records.append(record)
+            return records
 
 
 # -----------------------------------------------------------------------------
@@ -491,14 +579,12 @@ class BrowseableItem:
             **hci.HCI_Object.dict_from_bytes(data, offset + 3, subclass.fields)
         )
         instance._payload = data[3:]
-        return offset + length, instance
+        return offset + length + 3, instance
 
     def __bytes__(self) -> bytes:
         if self._payload is None:
             self._payload = hci.HCI_Object.dict_to_bytes(self.__dict__, self.fields)
-        return (
+        return struct.pack('>BH', self.item_type, len(self._payload)) + self._payload
-            struct.pack('>BH', self.item_type, len(self._payload) + 3) + self._payload
-        )
 
     _Item = TypeVar('_Item', bound='BrowseableItem')
 
@@ -601,11 +687,11 @@ class MediaPlayerItem(BrowseableItem):
         metadata=MajorPlayerType.type_metadata(1)
     )
     player_sub_type: PlayerSubType = field(
-        metadata=PlayerSubType.type_metadata(4, byteorder='big')
+        metadata=PlayerSubType.type_metadata(4, byteorder='little')
     )
     play_status: PlayStatus = field(metadata=PlayStatus.type_metadata(1))
     feature_bitmask: Features = field(
-        metadata=Features.type_metadata(16, byteorder='big')
+        metadata=Features.type_metadata(16, byteorder='little')
     )
     character_set_id: CharacterSetId = field(
         metadata=CharacterSetId.type_metadata(2, byteorder='big')
@@ -634,7 +720,7 @@ class FolderItem(BrowseableItem):
 
     folder_uid: int = field(metadata=_UINT64_BE_METADATA)
     folder_type: FolderType = field(metadata=FolderType.type_metadata(1))
-    is_playable: FolderType = field(metadata=Playable.type_metadata(1))
+    is_playable: Playable = field(metadata=Playable.type_metadata(1))
     character_set_id: CharacterSetId = field(
         metadata=CharacterSetId.type_metadata(2, byteorder='big')
     )
@@ -876,7 +962,7 @@ class GetPlayStatusCommand(Command):
 class GetElementAttributesCommand(Command):
     pdu_id = PduId.GET_ELEMENT_ATTRIBUTES
 
-    identifier: int = field(metadata=hci.metadata(_UINT64_BE_METADATA))
+    identifier: int = field(metadata=_UINT64_BE_METADATA)
     attribute_ids: Sequence[MediaAttributeId] = field(
         metadata=MediaAttributeId.type_metadata(
             4, list_begin=True, list_end=True, byteorder='big'
@@ -951,7 +1037,7 @@ class ChangePathCommand(Command):
 
     uid_counter: int = field(metadata=hci.metadata('>2'))
     direction: Direction = field(metadata=Direction.type_metadata(1))
-    folder_uid: int = field(metadata=hci.metadata(_UINT64_BE_METADATA))
+    folder_uid: int = field(metadata=_UINT64_BE_METADATA)
 
 
 # -----------------------------------------------------------------------------
@@ -961,7 +1047,7 @@ class GetItemAttributesCommand(Command):
     pdu_id = PduId.GET_ITEM_ATTRIBUTES
 
     scope: Scope = field(metadata=Scope.type_metadata(1))
-    uid: int = field(metadata=hci.metadata(_UINT64_BE_METADATA))
+    uid: int = field(metadata=_UINT64_BE_METADATA)
     uid_counter: int = field(metadata=hci.metadata('>2'))
     start_item: int = field(metadata=hci.metadata('>4'))
     end_item: int = field(metadata=hci.metadata('>4'))
@@ -999,7 +1085,7 @@ class PlayItemCommand(Command):
     pdu_id = PduId.PLAY_ITEM
 
     scope: Scope = field(metadata=Scope.type_metadata(1))
-    uid: int = field(metadata=hci.metadata(_UINT64_BE_METADATA))
+    uid: int = field(metadata=_UINT64_BE_METADATA)
     uid_counter: int = field(metadata=hci.metadata('>2'))
 
 
@@ -1010,7 +1096,7 @@ class AddToNowPlayingCommand(Command):
     pdu_id = PduId.ADD_TO_NOW_PLAYING
 
     scope: Scope = field(metadata=Scope.type_metadata(1))
-    uid: int = field(metadata=hci.metadata(_UINT64_BE_METADATA))
+    uid: int = field(metadata=_UINT64_BE_METADATA)
     uid_counter: int = field(metadata=hci.metadata('>2'))
 
 
@@ -1204,6 +1290,10 @@ class InformBatteryStatusOfCtResponse(Response):
 @dataclass
 class GetPlayStatusResponse(Response):
     pdu_id = PduId.GET_PLAY_STATUS
+
+    # TG doesn't support Song Length or Position.
+    UNAVAILABLE = 0xFFFFFFFF
+
     song_length: int = field(metadata=hci.metadata(">4"))
     song_position: int = field(metadata=hci.metadata(">4"))
     play_status: PlayStatus = field(metadata=PlayStatus.type_metadata(1))
@@ -1521,16 +1611,33 @@ class Delegate:
         def __init__(self, status_code: StatusCode) -> None:
             self.status_code = status_code
 
-    supported_events: list[EventId]
+    class AvcError(Exception):
-    volume: int
+        """The delegate AVC method failed, with a specified status code."""
 
-    def __init__(self, supported_events: Iterable[EventId] = ()) -> None:
+        def __init__(self, status_code: avc.ResponseFrame.ResponseCode) -> None:
+            self.status_code = status_code
+
+    supported_events: list[EventId]
+    supported_company_ids: list[int]
+    volume: int
+    playback_status: PlayStatus
+
+    def __init__(
+        self,
+        supported_events: Iterable[EventId] = (),
+        supported_company_ids: Iterable[int] = (AVRCP_BLUETOOTH_SIG_COMPANY_ID,),
+    ) -> None:
+        self.supported_company_ids = list(supported_company_ids)
         self.supported_events = list(supported_events)
         self.volume = 0
+        self.playback_status = PlayStatus.STOPPED
 
     async def get_supported_events(self) -> list[EventId]:
         return self.supported_events
 
+    async def get_supported_company_ids(self) -> list[int]:
+        return self.supported_company_ids
+
     async def set_absolute_volume(self, volume: int) -> None:
         """
         Set the absolute volume.
@@ -1543,6 +1650,19 @@ class Delegate:
     async def get_absolute_volume(self) -> int:
         return self.volume
 
+    async def on_key_event(
+        self,
+        key: avc.PassThroughFrame.OperationId,
+        pressed: bool,
+        data: bytes,
+    ) -> None:
+        logger.debug(
+            "@@@ on_key_event: key=%s, pressed=%s, data=%s", key, pressed, data.hex()
+        )
+
+    async def get_playback_status(self) -> PlayStatus:
+        return self.playback_status
+
     # TODO add other delegate methods
 
 
@@ -1756,6 +1876,19 @@ class Protocol(utils.EventEmitter):
             if isinstance(capability, EventId)
         )
 
+    async def get_supported_company_ids(self) -> list[int]:
+        """Get the list of events supported by the connected peer."""
+        response_context = await self.send_avrcp_command(
+            avc.CommandFrame.CommandType.STATUS,
+            GetCapabilitiesCommand(GetCapabilitiesCommand.CapabilityId.COMPANY_ID),
+        )
+        response = self._check_response(response_context, GetCapabilitiesResponse)
+        return list(
+            int.from_bytes(capability, 'big')
+            for capability in response.capabilities
+            if isinstance(capability, bytes)
+        )
+
     async def get_play_status(self) -> SongAndPlayStatus:
         """Get the play status of the connected peer."""
         response_context = await self.send_avrcp_command(
@@ -2052,16 +2185,28 @@ class Protocol(utils.EventEmitter):
             return
 
         if isinstance(command, avc.PassThroughCommandFrame):
-            # TODO: delegate
+
-            response = avc.PassThroughResponseFrame(
+            async def dispatch_key_event() -> None:
-                avc.ResponseFrame.ResponseCode.ACCEPTED,
+                try:
-                command.subunit_type,
+                    await self.delegate.on_key_event(
-                command.subunit_id,
+                        command.operation_id,
-                command.state_flag,
+                        command.state_flag == avc.PassThroughFrame.StateFlag.PRESSED,
-                command.operation_id,
+                        command.operation_data,
-                command.operation_data,
+                    )
-            )
+                    response_code = avc.ResponseFrame.ResponseCode.ACCEPTED
-            self.send_response(transaction_label, response)
+                except Delegate.AvcError as error:
+                    logger.exception("delegate method raised exception")
+                    response_code = error.status_code
+                except Exception:
+                    logger.exception("delegate method raised exception")
+                    response_code = avc.ResponseFrame.ResponseCode.REJECTED
+                self.send_passthrough_response(
+                    transaction_label=transaction_label,
+                    command=command,
+                    response_code=response_code,
+                )
+
+            utils.AsyncRunner.spawn(dispatch_key_event())
             return
 
         # TODO handle other types
@@ -2141,6 +2286,8 @@ class Protocol(utils.EventEmitter):
                 self._on_set_absolute_volume_command(transaction_label, command)
             elif isinstance(command, RegisterNotificationCommand):
                 self._on_register_notification_command(transaction_label, command)
+            elif isinstance(command, GetPlayStatusCommand):
+                self._on_get_play_status_command(transaction_label, command)
             else:
                 # Not supported.
                 # TODO: check that this is the right way to respond in this case.
@@ -2364,17 +2511,27 @@ class Protocol(utils.EventEmitter):
         logger.debug(f"<<< AVRCP command PDU: {command}")
 
         async def get_supported_events() -> None:
+            capabilities: Sequence[bytes | SupportsBytes]
             if (
                 command.capability_id
-                != GetCapabilitiesCommand.CapabilityId.EVENTS_SUPPORTED
+                == GetCapabilitiesCommand.CapabilityId.EVENTS_SUPPORTED
             ):
-                raise core.InvalidArgumentError()
+                capabilities = await self.delegate.get_supported_events()
-
+            elif (
-            supported_events = await self.delegate.get_supported_events()
+                command.capability_id == GetCapabilitiesCommand.CapabilityId.COMPANY_ID
+            ):
+                company_ids = await self.delegate.get_supported_company_ids()
+                capabilities = [
+                    company_id.to_bytes(3, 'big') for company_id in company_ids
+                ]
+            else:
+                raise core.InvalidArgumentError(
+                    f"Unsupported capability: {command.capability_id}"
+                )
             self.send_avrcp_response(
                 transaction_label,
                 avc.ResponseFrame.ResponseCode.IMPLEMENTED_OR_STABLE,
-                GetCapabilitiesResponse(command.capability_id, supported_events),
+                GetCapabilitiesResponse(command.capability_id, capabilities),
             )
 
         self._delegate_command(transaction_label, command, get_supported_events())
@@ -2395,6 +2552,26 @@ class Protocol(utils.EventEmitter):
 
         self._delegate_command(transaction_label, command, set_absolute_volume())
 
+    def _on_get_play_status_command(
+        self, transaction_label: int, command: GetPlayStatusCommand
+    ) -> None:
+        logger.debug("<<< AVRCP command PDU: %s", command)
+
+        async def get_playback_status() -> None:
+            play_status: PlayStatus = await self.delegate.get_playback_status()
+            self.send_avrcp_response(
+                transaction_label,
+                avc.ResponseFrame.ResponseCode.IMPLEMENTED_OR_STABLE,
+                GetPlayStatusResponse(
+                    # TODO: Delegate this.
+                    song_length=GetPlayStatusResponse.UNAVAILABLE,
+                    song_position=GetPlayStatusResponse.UNAVAILABLE,
+                    play_status=play_status,
+                ),
+            )
+
+        self._delegate_command(transaction_label, command, get_playback_status())
+
     def _on_register_notification_command(
         self, transaction_label: int, command: RegisterNotificationCommand
     ) -> None:
@@ -2410,28 +2587,27 @@ class Protocol(utils.EventEmitter):
                 )
                 return
 
+            response: Response
             if command.event_id == EventId.VOLUME_CHANGED:
                 volume = await self.delegate.get_absolute_volume()
                 response = RegisterNotificationResponse(VolumeChangedEvent(volume))
-                self.send_avrcp_response(
+            elif command.event_id == EventId.PLAYBACK_STATUS_CHANGED:
-                    transaction_label,
+                playback_status = await self.delegate.get_playback_status()
-                    avc.ResponseFrame.ResponseCode.INTERIM,
+                response = RegisterNotificationResponse(
-                    response,
+                    PlaybackStatusChangedEvent(play_status=playback_status)
                 )
-                self._register_notification_listener(transaction_label, command)
+            elif command.event_id == EventId.NOW_PLAYING_CONTENT_CHANGED:
+                playback_status = await self.delegate.get_playback_status()
+                response = RegisterNotificationResponse(NowPlayingContentChangedEvent())
+            else:
+                logger.warning("Event supported but not handled %s", command.event_id)
                 return
 
-            if command.event_id == EventId.PLAYBACK_STATUS_CHANGED:
+            self.send_avrcp_response(
-                # TODO: testing only, use delegate
+                transaction_label,
-                response = RegisterNotificationResponse(
+                avc.ResponseFrame.ResponseCode.INTERIM,
-                    PlaybackStatusChangedEvent(play_status=PlayStatus.PLAYING)
+                response,
-                )
+            )
-                self.send_avrcp_response(
+            self._register_notification_listener(transaction_label, command)
-                    transaction_label,
-                    avc.ResponseFrame.ResponseCode.INTERIM,
-                    response,
-                )
-                self._register_notification_listener(transaction_label, command)
-                return
 
         self._delegate_command(transaction_label, command, register_notification())

bumble/bridge.py

@@ -37,7 +37,12 @@ class HCI_Bridge:
 
         def on_packet(self, packet):
             # Convert the packet bytes to an object
-            hci_packet = HCI_Packet.from_bytes(packet)
+            try:
+                hci_packet = HCI_Packet.from_bytes(packet)
+            except Exception:
+                logger.warning('forwarding unparsed packet as-is')
+                self.hci_sink.on_packet(packet)
+                return
 
             # Filter the packet
             if self.packet_filter is not None:
@@ -50,7 +55,10 @@ class HCI_Bridge:
                         return
 
             # Analyze the packet
-            self.trace(hci_packet)
+            try:
+                self.trace(hci_packet)
+            except Exception:
+                logger.exception('Exception while tracing packet')
 
             # Bridge the packet
             self.hci_sink.on_packet(packet)

bumble/controller.py

@@ -421,7 +421,7 @@ class Controller:
                 hci.HCI_Command_Complete_Event(
                     num_hci_command_packets=1,
                     command_opcode=command.op_code,
-                    return_parameters=result,
+                    return_parameters=hci.HCI_GenericReturnParameters(data=result),
                 )
             )
 
@@ -1898,6 +1898,19 @@ class Controller:
         '''
         return bytes([hci.HCI_SUCCESS]) + self.le_features.value.to_bytes(8, 'little')
 
+    def on_hci_le_read_all_local_supported_features_command(
+        self, _command: hci.HCI_LE_Read_All_Local_Supported_Features_Command
+    ) -> bytes | None:
+        '''
+        See Bluetooth spec Vol 4, Part E - 7.8.128 LE Read All Local Supported Features
+        Command
+        '''
+        return (
+            bytes([hci.HCI_SUCCESS])
+            + bytes([0])
+            + self.le_features.value.to_bytes(248, 'little')
+        )
+
     def on_hci_le_set_random_address_command(
         self, command: hci.HCI_LE_Set_Random_Address_Command
     ) -> bytes | None:

bumble/core.py

@@ -923,7 +923,7 @@ class DeviceClass:
     # pylint: enable=line-too-long
 
     @staticmethod
-    def split_class_of_device(class_of_device):
+    def split_class_of_device(class_of_device: int) -> tuple[int, int, int]:
         # Split the bit fields of the composite class of device value into:
         # (service_classes, major_device_class, minor_device_class)
         return (

bumble/drivers/intel.py

@@ -89,51 +89,54 @@ HCI_INTEL_WRITE_BOOT_PARAMS_COMMAND = hci.hci_vendor_command_op_code(0x000E)
 hci.HCI_Command.register_commands(globals())
 
 
-@hci.HCI_Command.command
 @dataclasses.dataclass
-class HCI_Intel_Read_Version_Command(hci.HCI_Command):
+class HCI_Intel_Read_Version_ReturnParameters(hci.HCI_StatusReturnParameters):
+    tlv: bytes = hci.field(metadata=hci.metadata('*'))
+
+
+@hci.HCI_SyncCommand.sync_command(HCI_Intel_Read_Version_ReturnParameters)
+@dataclasses.dataclass
+class HCI_Intel_Read_Version_Command(
+    hci.HCI_SyncCommand[HCI_Intel_Read_Version_ReturnParameters]
+):
     param0: int = dataclasses.field(metadata=hci.metadata(1))
 
-    return_parameters_fields = [
-        ("status", hci.STATUS_SPEC),
-        ("tlv", "*"),
-    ]
 
-
+@hci.HCI_SyncCommand.sync_command(hci.HCI_StatusReturnParameters)
-@hci.HCI_Command.command
 @dataclasses.dataclass
-class Hci_Intel_Secure_Send_Command(hci.HCI_Command):
+class Hci_Intel_Secure_Send_Command(
+    hci.HCI_SyncCommand[hci.HCI_StatusReturnParameters]
+):
     data_type: int = dataclasses.field(metadata=hci.metadata(1))
     data: bytes = dataclasses.field(metadata=hci.metadata("*"))
 
-    return_parameters_fields = [
-        ("status", 1),
-    ]
 
-
-@hci.HCI_Command.command
 @dataclasses.dataclass
-class HCI_Intel_Reset_Command(hci.HCI_Command):
+class HCI_Intel_Reset_ReturnParameters(hci.HCI_ReturnParameters):
+    data: bytes = hci.field(metadata=hci.metadata('*'))
+
+
+@hci.HCI_SyncCommand.sync_command(HCI_Intel_Reset_ReturnParameters)
+@dataclasses.dataclass
+class HCI_Intel_Reset_Command(hci.HCI_SyncCommand[HCI_Intel_Reset_ReturnParameters]):
     reset_type: int = dataclasses.field(metadata=hci.metadata(1))
     patch_enable: int = dataclasses.field(metadata=hci.metadata(1))
     ddc_reload: int = dataclasses.field(metadata=hci.metadata(1))
     boot_option: int = dataclasses.field(metadata=hci.metadata(1))
     boot_address: int = dataclasses.field(metadata=hci.metadata(4))
 
-    return_parameters_fields = [
-        ("data", "*"),
-    ]
 
-
-@hci.HCI_Command.command
 @dataclasses.dataclass
-class Hci_Intel_Write_Device_Config_Command(hci.HCI_Command):
+class HCI_Intel_Write_Device_Config_ReturnParameters(hci.HCI_StatusReturnParameters):
-    data: bytes = dataclasses.field(metadata=hci.metadata("*"))
+    params: bytes = hci.field(metadata=hci.metadata('*'))
 
-    return_parameters_fields = [
+
-        ("status", hci.STATUS_SPEC),
+@hci.HCI_SyncCommand.sync_command(HCI_Intel_Write_Device_Config_ReturnParameters)
-        ("params", "*"),
+@dataclasses.dataclass
-    ]
+class HCI_Intel_Write_Device_Config_Command(
+    hci.HCI_SyncCommand[HCI_Intel_Write_Device_Config_ReturnParameters]
+):
+    data: bytes = dataclasses.field(metadata=hci.metadata("*"))
 
 
 # -----------------------------------------------------------------------------
@@ -402,7 +405,7 @@ class Driver(common.Driver):
             self.host.on_hci_event_packet(event)
             return
 
-        if not event.return_parameters == hci.HCI_SUCCESS:
+        if not event.return_parameters.status == hci.HCI_SUCCESS:
             raise DriverError("HCI_Command_Complete_Event error")
 
         if self.max_in_flight_firmware_load_commands != event.num_hci_command_packets:
@@ -641,8 +644,8 @@ class Driver(common.Driver):
         while ddc_data:
             ddc_len = 1 + ddc_data[0]
             ddc_payload = ddc_data[:ddc_len]
-            await self.host.send_command(
+            await self.host.send_sync_command(
-                Hci_Intel_Write_Device_Config_Command(data=ddc_payload)
+                HCI_Intel_Write_Device_Config_Command(data=ddc_payload)
             )
             ddc_data = ddc_data[ddc_len:]
 
@@ -660,31 +663,34 @@ class Driver(common.Driver):
 
     async def read_device_info(self) -> dict[ValueType, Any]:
         self.host.ready = True
-        response = await self.host.send_command(hci.HCI_Reset_Command())
+        response1 = await self.host.send_sync_command_raw(hci.HCI_Reset_Command())
-        if not (
+        if not isinstance(
-            isinstance(response, hci.HCI_Command_Complete_Event)
+            response1.return_parameters, hci.HCI_StatusReturnParameters
-            and response.return_parameters
+        ) or response1.return_parameters.status not in (
-            in (hci.HCI_UNKNOWN_HCI_COMMAND_ERROR, hci.HCI_SUCCESS)
+            hci.HCI_UNKNOWN_HCI_COMMAND_ERROR,
+            hci.HCI_SUCCESS,
         ):
             # When the controller is in operational mode, the response is a
             # successful response.
             # When the controller is in bootloader mode,
             # HCI_UNKNOWN_HCI_COMMAND_ERROR is the expected response. Anything
             # else is a failure.
-            logger.warning(f"unexpected response: {response}")
+            logger.warning(f"unexpected response: {response1}")
             raise DriverError("unexpected HCI response")
 
         # Read the firmware version.
-        response = await self.host.send_command(
+        response2 = await self.host.send_sync_command_raw(
             HCI_Intel_Read_Version_Command(param0=0xFF)
         )
-        if not isinstance(response, hci.HCI_Command_Complete_Event):
+        if (
-            raise DriverError("unexpected HCI response")
+            not isinstance(
-
+                response2.return_parameters, HCI_Intel_Read_Version_ReturnParameters
-        if response.return_parameters.status != 0:  # type: ignore
+            )
+            or response2.return_parameters.status != 0
+        ):
             raise DriverError("HCI_Intel_Read_Version_Command error")
 
-        tlvs = _parse_tlv(response.return_parameters.tlv)  # type: ignore
+        tlvs = _parse_tlv(response2.return_parameters.tlv)  # type: ignore
 
         # Convert the list to a dict. That's Ok here because we only expect each type
         # to appear just once.

bumble/drivers/rtk.py

@@ -16,6 +16,7 @@ Support for Realtek USB dongles.
 Based on various online bits of information, including the Linux kernel.
 (see `drivers/bluetooth/btrtl.c`)
 """
+from __future__ import annotations
 
 import asyncio
 import enum
@@ -31,10 +32,14 @@ import weakref
 # Imports
 # -----------------------------------------------------------------------------
 from dataclasses import dataclass, field
+from typing import TYPE_CHECKING
 
 from bumble import core, hci
 from bumble.drivers import common
 
+if TYPE_CHECKING:
+    from bumble.host import Host
+
 # -----------------------------------------------------------------------------
 # Logging
 # -----------------------------------------------------------------------------
@@ -77,6 +82,7 @@ class RtlProjectId(enum.IntEnum):
     PROJECT_ID_8852A = 18
     PROJECT_ID_8852B = 20
     PROJECT_ID_8852C = 25
+    PROJECT_ID_8761C = 51
 
 
 RTK_PROJECT_ID_TO_ROM = {
@@ -92,6 +98,7 @@ RTK_PROJECT_ID_TO_ROM = {
     18: RTK_ROM_LMP_8852A,
     20: RTK_ROM_LMP_8852A,
     25: RTK_ROM_LMP_8852A,
+    51: RTK_ROM_LMP_8761A,
 }
 
 # List of USB (VendorID, ProductID) for Realtek-based devices.
@@ -122,7 +129,12 @@ RTK_USB_PRODUCTS = {
     (0x2357, 0x0604),
     (0x2550, 0x8761),
     (0x2B89, 0x8761),
+    (0x2C0A, 0x8761),
     (0x7392, 0xC611),
+    # Realtek 8761CUV
+    (0x0B05, 0x1BF6),
+    (0x0BDA, 0xC761),
+    (0x7392, 0xF611),
     # Realtek 8821AE
     (0x0B05, 0x17DC),
     (0x13D3, 0x3414),
@@ -182,23 +194,36 @@ HCI_RTK_DROP_FIRMWARE_COMMAND = hci.hci_vendor_command_op_code(0x66)
 hci.HCI_Command.register_commands(globals())
 
 
-@hci.HCI_Command.command
 @dataclass
-class HCI_RTK_Read_ROM_Version_Command(hci.HCI_Command):
+class HCI_RTK_Read_ROM_Version_ReturnParameters(hci.HCI_StatusReturnParameters):
-    return_parameters_fields = [("status", hci.STATUS_SPEC), ("version", 1)]
+    version: int = field(metadata=hci.metadata(1))
 
 
-@hci.HCI_Command.command
+@hci.HCI_SyncCommand.sync_command(HCI_RTK_Read_ROM_Version_ReturnParameters)
 @dataclass
-class HCI_RTK_Download_Command(hci.HCI_Command):
+class HCI_RTK_Read_ROM_Version_Command(
+    hci.HCI_SyncCommand[HCI_RTK_Read_ROM_Version_ReturnParameters]
+):
+    pass
+
+
+@dataclass
+class HCI_RTK_Download_ReturnParameters(hci.HCI_StatusReturnParameters):
+    index: int = field(metadata=hci.metadata(1))
+
+
+@hci.HCI_SyncCommand.sync_command(HCI_RTK_Download_ReturnParameters)
+@dataclass
+class HCI_RTK_Download_Command(hci.HCI_SyncCommand[HCI_RTK_Download_ReturnParameters]):
     index: int = field(metadata=hci.metadata(1))
     payload: bytes = field(metadata=hci.metadata(RTK_FRAGMENT_LENGTH))
-    return_parameters_fields = [("status", hci.STATUS_SPEC), ("index", 1)]
 
 
-@hci.HCI_Command.command
+@hci.HCI_SyncCommand.sync_command(hci.HCI_GenericReturnParameters)
 @dataclass
-class HCI_RTK_Drop_Firmware_Command(hci.HCI_Command):
+class HCI_RTK_Drop_Firmware_Command(
+    hci.HCI_SyncCommand[hci.HCI_GenericReturnParameters]
+):
     pass
 
 
@@ -363,6 +388,15 @@ class Driver(common.Driver):
             fw_name="rtl8761bu_fw.bin",
             config_name="rtl8761bu_config.bin",
         ),
+        # 8761CU
+        DriverInfo(
+            rom=RTK_ROM_LMP_8761A,
+            hci=(0x0E, 0x00),
+            config_needed=False,
+            has_rom_version=True,
+            fw_name="rtl8761cu_fw.bin",
+            config_name="rtl8761cu_config.bin",
+        ),
         # 8822C
         DriverInfo(
             rom=RTK_ROM_LMP_8822B,
@@ -420,9 +454,17 @@ class Driver(common.Driver):
     @staticmethod
     def find_driver_info(hci_version, hci_subversion, lmp_subversion):
         for driver_info in Driver.DRIVER_INFOS:
-            if driver_info.rom == lmp_subversion and driver_info.hci == (
+            if driver_info.rom == lmp_subversion and (
-                hci_subversion,
+                driver_info.hci
-                hci_version,
+                == (
+                    hci_subversion,
+                    hci_version,
+                )
+                or driver_info.hci
+                == (
+                    hci_subversion,
+                    0x0,
+                )
             ):
                 return driver_info
 
@@ -467,7 +509,7 @@ class Driver(common.Driver):
         return None
 
     @staticmethod
-    def check(host):
+    def check(host: Host) -> bool:
         if not host.hci_metadata:
             logger.debug("USB metadata not found")
             return False
@@ -491,37 +533,44 @@ class Driver(common.Driver):
         return True
 
     @staticmethod
-    async def get_loaded_firmware_version(host):
+    async def get_loaded_firmware_version(host: Host) -> int | None:
-        response = await host.send_command(HCI_RTK_Read_ROM_Version_Command())
+        response1 = await host.send_sync_command_raw(HCI_RTK_Read_ROM_Version_Command())
-
+        if (
-        if response.return_parameters.status != hci.HCI_SUCCESS:
+            not isinstance(
+                response1.return_parameters, HCI_RTK_Read_ROM_Version_ReturnParameters
+            )
+            or response1.return_parameters.status != hci.HCI_SUCCESS
+        ):
             return None
 
-        response = await host.send_command(
+        response2 = await host.send_sync_command(
-            hci.HCI_Read_Local_Version_Information_Command(), check_result=True
+            hci.HCI_Read_Local_Version_Information_Command()
-        )
-        return (
-            response.return_parameters.hci_subversion << 16
-            | response.return_parameters.lmp_subversion
         )
+        return response2.hci_subversion << 16 | response2.lmp_subversion
 
     @classmethod
-    async def driver_info_for_host(cls, host):
+    async def driver_info_for_host(cls, host: Host) -> DriverInfo | None:
         try:
-            await host.send_command(
+            await host.send_sync_command(
                 hci.HCI_Reset_Command(),
-                check_result=True,
                 response_timeout=cls.POST_RESET_DELAY,
             )
             host.ready = True  # Needed to let the host know the controller is ready.
         except asyncio.exceptions.TimeoutError:
             logger.warning("timeout waiting for hci reset, retrying")
-            await host.send_command(hci.HCI_Reset_Command(), check_result=True)
+            await host.send_sync_command(hci.HCI_Reset_Command())
             host.ready = True
 
-        command = hci.HCI_Read_Local_Version_Information_Command()
+        response = await host.send_sync_command_raw(
-        response = await host.send_command(command, check_result=True)
+            hci.HCI_Read_Local_Version_Information_Command()
-        if response.command_opcode != command.op_code:
+        )
+        if (
+            not isinstance(
+                response.return_parameters,
+                hci.HCI_Read_Local_Version_Information_ReturnParameters,
+            )
+            or response.return_parameters.status != hci.HCI_SUCCESS
+        ):
             logger.error("failed to probe local version information")
             return None
 
@@ -546,7 +595,7 @@ class Driver(common.Driver):
         return driver_info
 
     @classmethod
-    async def for_host(cls, host, force=False):
+    async def for_host(cls, host: Host, force: bool = False):
         # Check that a driver is needed for this host
         if not force and not cls.check(host):
             return None
@@ -601,15 +650,21 @@ class Driver(common.Driver):
 
         # TODO: load the firmware
 
-    async def download_for_rtl8723b(self):
+    async def download_for_rtl8723b(self) -> int | None:
         if self.driver_info.has_rom_version:
-            response = await self.host.send_command(
+            response1 = await self.host.send_sync_command_raw(
-                HCI_RTK_Read_ROM_Version_Command(), check_result=True
+                HCI_RTK_Read_ROM_Version_Command()
             )
-            if response.return_parameters.status != hci.HCI_SUCCESS:
+            if (
+                not isinstance(
+                    response1.return_parameters,
+                    HCI_RTK_Read_ROM_Version_ReturnParameters,
+                )
+                or response1.return_parameters.status != hci.HCI_SUCCESS
+            ):
                 logger.warning("can't get ROM version")
                 return None
-            rom_version = response.return_parameters.version
+            rom_version = response1.return_parameters.version
             logger.debug(f"ROM version before download: {rom_version:04X}")
         else:
             rom_version = 0
@@ -644,21 +699,25 @@ class Driver(common.Driver):
             fragment_offset = fragment_index * RTK_FRAGMENT_LENGTH
             fragment = payload[fragment_offset : fragment_offset + RTK_FRAGMENT_LENGTH]
             logger.debug(f"downloading fragment {fragment_index}")
-            await self.host.send_command(
+            await self.host.send_sync_command(
-                HCI_RTK_Download_Command(index=download_index, payload=fragment),
+                HCI_RTK_Download_Command(index=download_index, payload=fragment)
-                check_result=True,
             )
 
         logger.debug("download complete!")
 
         # Read the version again
-        response = await self.host.send_command(
+        response2 = await self.host.send_sync_command_raw(
-            HCI_RTK_Read_ROM_Version_Command(), check_result=True
+            HCI_RTK_Read_ROM_Version_Command()
         )
-        if response.return_parameters.status != hci.HCI_SUCCESS:
+        if (
+            not isinstance(
+                response2.return_parameters, HCI_RTK_Read_ROM_Version_ReturnParameters
+            )
+            or response2.return_parameters.status != hci.HCI_SUCCESS
+        ):
             logger.warning("can't get ROM version")
         else:
-            rom_version = response.return_parameters.version
+            rom_version = response2.return_parameters.version
             logger.debug(f"ROM version after download: {rom_version:02X}")
 
         return firmware.version
@@ -680,7 +739,7 @@ class Driver(common.Driver):
 
     async def init_controller(self):
         await self.download_firmware()
-        await self.host.send_command(hci.HCI_Reset_Command(), check_result=True)
+        await self.host.send_sync_command(hci.HCI_Reset_Command())
         logger.info(f"loaded FW image {self.driver_info.fw_name}")
 
 

bumble/gatt.py

@@ -29,7 +29,7 @@ import functools
 import logging
 import struct
 from collections.abc import Iterable, Sequence
-from typing import TypeVar
+from typing import ClassVar, TypeVar
 
 from bumble.att import Attribute, AttributeValue, AttributeValueV2
 from bumble.colors import color
@@ -403,7 +403,7 @@ class TemplateService(Service):
     to expose their UUID as a class property
     '''
 
-    UUID: UUID
+    UUID: ClassVar[UUID]
 
     def __init__(
         self,

bumble/gatt_client.py

@@ -34,11 +34,14 @@ from datetime import datetime
 from typing import (
     TYPE_CHECKING,
     Any,
+    ClassVar,
     Generic,
     TypeVar,
     overload,
 )
 
+from typing_extensions import Self
+
 from bumble import att, core, l2cap, utils
 from bumble.colors import color
 from bumble.core import UUID, InvalidStateError
@@ -249,10 +252,10 @@ class ProfileServiceProxy:
     Base class for profile-specific service proxies
     '''
 
-    SERVICE_CLASS: type[TemplateService]
+    SERVICE_CLASS: ClassVar[type[TemplateService]]
 
     @classmethod
-    def from_client(cls, client: Client) -> ProfileServiceProxy | None:
+    def from_client(cls, client: Client) -> Self | None:
         return ServiceProxy.from_client(cls, client, cls.SERVICE_CLASS.UUID)
 
 
@@ -285,8 +288,6 @@ class Client:
             self._bearer_id = (
                 f'[0x{bearer.connection.handle:04X}|CID=0x{bearer.source_cid:04X}]'
             )
-            # Fill the mtu.
-            bearer.on_att_mtu_update(att.ATT_DEFAULT_MTU)
             self.connection = bearer.connection
         else:
             bearer.on(bearer.EVENT_DISCONNECTION, self.on_disconnection)

bumble/gatt_server.py

@@ -115,7 +115,6 @@ class Server(utils.EventEmitter):
                 channel.connection.handle,
                 channel.source_cid,
             )
-            channel.att_mtu = att.ATT_DEFAULT_MTU
             channel.sink = lambda pdu: self.on_gatt_pdu(
                 channel, att.ATT_PDU.from_bytes(pdu)
             )
@@ -777,6 +776,18 @@ class Server(utils.EventEmitter):
             error_code=att.ATT_ATTRIBUTE_NOT_FOUND_ERROR,
         )
 
+        if (
+            request.starting_handle == 0x0000
+            or request.starting_handle > request.ending_handle
+        ):
+            response = att.ATT_Error_Response(
+                request_opcode_in_error=request.op_code,
+                attribute_handle_in_error=request.starting_handle,
+                error_code=att.ATT_INVALID_HANDLE_ERROR,
+            )
+            self.send_response(bearer, response)
+            return
+
         attributes: list[tuple[int, bytes]] = []
         for attribute in (
             attribute
@@ -977,6 +988,94 @@ class Server(utils.EventEmitter):
 
         self.send_response(bearer, response)
 
+    @utils.AsyncRunner.run_in_task()
+    async def on_att_read_multiple_request(
+        self, bearer: att.Bearer, request: att.ATT_Read_Multiple_Request
+    ):
+        '''
+        See Bluetooth spec Vol 3, Part F - 3.4.4.7 Read Multiple Request.
+        '''
+        response: att.ATT_PDU
+
+        pdu_space_available = bearer.att_mtu - 1
+        values: list[bytes] = []
+
+        for handle in request.set_of_handles:
+            if not (attribute := self.get_attribute(handle)):
+                response = att.ATT_Error_Response(
+                    request_opcode_in_error=request.op_code,
+                    attribute_handle_in_error=handle,
+                    error_code=att.ATT_ATTRIBUTE_NOT_FOUND_ERROR,
+                )
+                self.send_response(bearer, response)
+                return
+            # No need to catch permission errors here, since these attributes
+            # must all be world-readable
+            attribute_value = await attribute.read_value(bearer)
+            # Check the attribute value size
+            max_attribute_size = min(bearer.att_mtu - 1, 251)
+            if len(attribute_value) > max_attribute_size:
+                # We need to truncate
+                attribute_value = attribute_value[:max_attribute_size]
+
+            # Check if there is enough space
+            entry_size = len(attribute_value)
+            if pdu_space_available < entry_size:
+                break
+
+            # Add the attribute to the list
+            values.append(attribute_value)
+            pdu_space_available -= entry_size
+
+        response = att.ATT_Read_Multiple_Response(set_of_values=b''.join(values))
+        self.send_response(bearer, response)
+
+    @utils.AsyncRunner.run_in_task()
+    async def on_att_read_multiple_variable_request(
+        self, bearer: att.Bearer, request: att.ATT_Read_Multiple_Variable_Request
+    ):
+        '''
+        See Bluetooth spec Vol 3, Part F - 3.4.4.11 Read Multiple Variable Request.
+        '''
+        response: att.ATT_PDU
+
+        pdu_space_available = bearer.att_mtu - 1
+        length_value_tuple_list: list[tuple[int, bytes]] = []
+
+        for handle in request.set_of_handles:
+            if not (attribute := self.get_attribute(handle)):
+                response = att.ATT_Error_Response(
+                    request_opcode_in_error=request.op_code,
+                    attribute_handle_in_error=handle,
+                    error_code=att.ATT_ATTRIBUTE_NOT_FOUND_ERROR,
+                )
+                self.send_response(bearer, response)
+                return
+            # No need to catch permission errors here, since these attributes
+            # must all be world-readable
+            attribute_value = await attribute.read_value(bearer)
+            length = len(attribute_value)
+            # Check the attribute value size
+            max_attribute_size = min(bearer.att_mtu - 3, 251)
+            if len(attribute_value) > max_attribute_size:
+                # We need to truncate
+                attribute_value = attribute_value[:max_attribute_size]
+
+            # Check if there is enough space
+            entry_size = 2 + len(attribute_value)
+
+            # Add the attribute to the list
+            length_value_tuple_list.append((length, attribute_value))
+            pdu_space_available -= entry_size
+
+            if pdu_space_available <= 0:
+                break
+
+        response = att.ATT_Read_Multiple_Variable_Response(
+            length_value_tuple_list=length_value_tuple_list
+        )
+        self.send_response(bearer, response)
+
     @utils.AsyncRunner.run_in_task()
     async def on_att_write_request(
         self, bearer: att.Bearer, request: att.ATT_Write_Request

bumble/hid.py

@@ -312,11 +312,11 @@ class HID(ABC, utils.EventEmitter):
 
     def send_pdu_on_ctrl(self, msg: bytes) -> None:
         assert self.l2cap_ctrl_channel
-        self.l2cap_ctrl_channel.send_pdu(msg)
+        self.l2cap_ctrl_channel.write(msg)
 
     def send_pdu_on_intr(self, msg: bytes) -> None:
         assert self.l2cap_intr_channel
-        self.l2cap_intr_channel.send_pdu(msg)
+        self.l2cap_intr_channel.write(msg)
 
     def send_data(self, data: bytes) -> None:
         if self.role == HID.Role.HOST:

bumble/host.py

@@ -21,13 +21,16 @@ import asyncio
 import collections
 import dataclasses
 import logging
-import struct
 from collections.abc import Awaitable, Callable
-from typing import TYPE_CHECKING, Any, cast
+from typing import TYPE_CHECKING, Any, TypeVar, cast, overload
 
 from bumble import drivers, hci, utils
 from bumble.colors import color
-from bumble.core import ConnectionPHY, InvalidStateError, PhysicalTransport
+from bumble.core import (
+    ConnectionPHY,
+    InvalidStateError,
+    PhysicalTransport,
+)
 from bumble.l2cap import L2CAP_PDU
 from bumble.snoop import Snooper
 from bumble.transport.common import TransportLostError
@@ -35,7 +38,6 @@ from bumble.transport.common import TransportLostError
 if TYPE_CHECKING:
     from bumble.transport.common import TransportSink, TransportSource
 
-
 # -----------------------------------------------------------------------------
 # Logging
 # -----------------------------------------------------------------------------
@@ -236,6 +238,9 @@ class IsoLink:
 
 
 # -----------------------------------------------------------------------------
+_RP = TypeVar('_RP', bound=hci.HCI_ReturnParameters)
+
+
 class Host(utils.EventEmitter):
     connections: dict[int, Connection]
     cis_links: dict[int, IsoLink]
@@ -264,13 +269,20 @@ class Host(utils.EventEmitter):
         self.bis_links = {}  # BIS links, by connection handle
         self.sco_links = {}  # SCO links, by connection handle
         self.bigs = {}  # BIG Handle to BIS Handles
-        self.pending_command = None
+        self.pending_command: hci.HCI_SyncCommand | hci.HCI_AsyncCommand | None = None
-        self.pending_response: asyncio.Future[Any] | None = None
+        self.pending_response: (
+            asyncio.Future[
+                hci.HCI_Command_Complete_Event | hci.HCI_Command_Status_Event
+            ]
+            | None
+        ) = None
         self.number_of_supported_advertising_sets = 0
         self.maximum_advertising_data_length = 31
-        self.local_version = None
+        self.local_version: (
+            hci.HCI_Read_Local_Version_Information_ReturnParameters | None
+        ) = None
         self.local_supported_commands = 0
-        self.local_le_features = 0
+        self.local_le_features = hci.LeFeatureMask(0)  # LE features
         self.local_lmp_features = hci.LmpFeatureMask(0)  # Classic LMP features
         self.suggested_max_tx_octets = 251  # Max allowed
         self.suggested_max_tx_time = 2120  # Max allowed
@@ -312,7 +324,7 @@ class Host(utils.EventEmitter):
         self.emit('flush')
         self.command_semaphore.release()
 
-    async def reset(self, driver_factory=drivers.get_driver_for_host):
+    async def reset(self, driver_factory=drivers.get_driver_for_host) -> None:
         if self.ready:
             self.ready = False
             await self.flush()
@@ -330,57 +342,61 @@ class Host(utils.EventEmitter):
 
         # Send a reset command unless a driver has already done so.
         if reset_needed:
-            await self.send_command(hci.HCI_Reset_Command(), check_result=True)
+            await self.send_sync_command(hci.HCI_Reset_Command())
             self.ready = True
 
-        response = await self.send_command(
+        response1 = await self.send_sync_command(
-            hci.HCI_Read_Local_Supported_Commands_Command(), check_result=True
+            hci.HCI_Read_Local_Supported_Commands_Command()
         )
         self.local_supported_commands = int.from_bytes(
-            response.return_parameters.supported_commands, 'little'
+            response1.supported_commands, 'little'
         )
 
-        if self.supports_command(hci.HCI_LE_READ_LOCAL_SUPPORTED_FEATURES_COMMAND):
-            response = await self.send_command(
-                hci.HCI_LE_Read_Local_Supported_Features_Command(), check_result=True
-            )
-            self.local_le_features = struct.unpack(
-                '<Q', response.return_parameters.le_features
-            )[0]
-
         if self.supports_command(hci.HCI_READ_LOCAL_VERSION_INFORMATION_COMMAND):
-            response = await self.send_command(
+            self.local_version = await self.send_sync_command(
-                hci.HCI_Read_Local_Version_Information_Command(), check_result=True
+                hci.HCI_Read_Local_Version_Information_Command()
+            )
+
+        if self.supports_command(hci.HCI_LE_READ_ALL_LOCAL_SUPPORTED_FEATURES_COMMAND):
+            response2 = await self.send_sync_command(
+                hci.HCI_LE_Read_All_Local_Supported_Features_Command()
+            )
+            self.local_le_features = hci.LeFeatureMask(
+                int.from_bytes(response2.le_features, 'little')
+            )
+        elif self.supports_command(hci.HCI_LE_READ_LOCAL_SUPPORTED_FEATURES_COMMAND):
+            response3 = await self.send_sync_command(
+                hci.HCI_LE_Read_Local_Supported_Features_Command()
+            )
+            self.local_le_features = hci.LeFeatureMask(
+                int.from_bytes(response3.le_features, 'little')
             )
-            self.local_version = response.return_parameters
 
         if self.supports_command(hci.HCI_READ_LOCAL_EXTENDED_FEATURES_COMMAND):
             max_page_number = 0
             page_number = 0
             lmp_features = 0
             while page_number <= max_page_number:
-                response = await self.send_command(
+                response4 = await self.send_sync_command(
                     hci.HCI_Read_Local_Extended_Features_Command(
                         page_number=page_number
-                    ),
+                    )
-                    check_result=True,
                 )
                 lmp_features |= int.from_bytes(
-                    response.return_parameters.extended_lmp_features, 'little'
+                    response4.extended_lmp_features, 'little'
                 ) << (64 * page_number)
-                max_page_number = response.return_parameters.maximum_page_number
+                max_page_number = response4.maximum_page_number
                 page_number += 1
             self.local_lmp_features = hci.LmpFeatureMask(lmp_features)
-
         elif self.supports_command(hci.HCI_READ_LOCAL_SUPPORTED_FEATURES_COMMAND):
-            response = await self.send_command(
+            response5 = await self.send_sync_command(
-                hci.HCI_Read_Local_Supported_Features_Command(), check_result=True
+                hci.HCI_Read_Local_Supported_Features_Command()
             )
             self.local_lmp_features = hci.LmpFeatureMask(
-                int.from_bytes(response.return_parameters.lmp_features, 'little')
+                int.from_bytes(response5.lmp_features, 'little')
             )
 
-        await self.send_command(
+        await self.send_sync_command(
             hci.HCI_Set_Event_Mask_Command(
                 event_mask=hci.HCI_Set_Event_Mask_Command.mask(
                     [
@@ -437,7 +453,7 @@ class Host(utils.EventEmitter):
             )
         )
         if self.supports_command(hci.HCI_SET_EVENT_MASK_PAGE_2_COMMAND):
-            await self.send_command(
+            await self.send_sync_command(
                 hci.HCI_Set_Event_Mask_Page_2_Command(
                     event_mask_page_2=hci.HCI_Set_Event_Mask_Page_2_Command.mask(
                         [hci.HCI_ENCRYPTION_CHANGE_V2_EVENT]
@@ -490,29 +506,28 @@ class Host(utils.EventEmitter):
                     hci.HCI_LE_TRANSMIT_POWER_REPORTING_EVENT,
                     hci.HCI_LE_BIGINFO_ADVERTISING_REPORT_EVENT,
                     hci.HCI_LE_SUBRATE_CHANGE_EVENT,
+                    hci.HCI_LE_READ_ALL_REMOTE_FEATURES_COMPLETE_EVENT,
                     hci.HCI_LE_CS_READ_REMOTE_SUPPORTED_CAPABILITIES_COMPLETE_EVENT,
                     hci.HCI_LE_CS_PROCEDURE_ENABLE_COMPLETE_EVENT,
                     hci.HCI_LE_CS_SECURITY_ENABLE_COMPLETE_EVENT,
                     hci.HCI_LE_CS_CONFIG_COMPLETE_EVENT,
                     hci.HCI_LE_CS_SUBEVENT_RESULT_EVENT,
                     hci.HCI_LE_CS_SUBEVENT_RESULT_CONTINUE_EVENT,
+                    hci.HCI_LE_MONITORED_ADVERTISERS_REPORT_EVENT,
+                    hci.HCI_LE_FRAME_SPACE_UPDATE_COMPLETE_EVENT,
+                    hci.HCI_LE_UTP_RECEIVE_EVENT,
+                    hci.HCI_LE_CONNECTION_RATE_CHANGE_EVENT,
                 ]
             )
 
-        await self.send_command(
+        await self.send_sync_command(
             hci.HCI_LE_Set_Event_Mask_Command(le_event_mask=le_event_mask)
         )
 
         if self.supports_command(hci.HCI_READ_BUFFER_SIZE_COMMAND):
-            response = await self.send_command(
+            response6 = await self.send_sync_command(hci.HCI_Read_Buffer_Size_Command())
-                hci.HCI_Read_Buffer_Size_Command(), check_result=True
+            hc_acl_data_packet_length = response6.hc_acl_data_packet_length
-            )
+            hc_total_num_acl_data_packets = response6.hc_total_num_acl_data_packets
-            hc_acl_data_packet_length = (
-                response.return_parameters.hc_acl_data_packet_length
-            )
-            hc_total_num_acl_data_packets = (
-                response.return_parameters.hc_total_num_acl_data_packets
-            )
 
             logger.debug(
                 'HCI ACL flow control: '
@@ -531,19 +546,13 @@ class Host(utils.EventEmitter):
         iso_data_packet_length = 0
         total_num_iso_data_packets = 0
         if self.supports_command(hci.HCI_LE_READ_BUFFER_SIZE_V2_COMMAND):
-            response = await self.send_command(
+            response7 = await self.send_sync_command(
-                hci.HCI_LE_Read_Buffer_Size_V2_Command(), check_result=True
+                hci.HCI_LE_Read_Buffer_Size_V2_Command()
-            )
-            le_acl_data_packet_length = (
-                response.return_parameters.le_acl_data_packet_length
-            )
-            total_num_le_acl_data_packets = (
-                response.return_parameters.total_num_le_acl_data_packets
-            )
-            iso_data_packet_length = response.return_parameters.iso_data_packet_length
-            total_num_iso_data_packets = (
-                response.return_parameters.total_num_iso_data_packets
             )
+            le_acl_data_packet_length = response7.le_acl_data_packet_length
+            total_num_le_acl_data_packets = response7.total_num_le_acl_data_packets
+            iso_data_packet_length = response7.iso_data_packet_length
+            total_num_iso_data_packets = response7.total_num_iso_data_packets
 
             logger.debug(
                 'HCI LE flow control: '
@@ -553,15 +562,11 @@ class Host(utils.EventEmitter):
                 f'total_num_iso_data_packets={total_num_iso_data_packets}'
             )
         elif self.supports_command(hci.HCI_LE_READ_BUFFER_SIZE_COMMAND):
-            response = await self.send_command(
+            response8 = await self.send_sync_command(
-                hci.HCI_LE_Read_Buffer_Size_Command(), check_result=True
+                hci.HCI_LE_Read_Buffer_Size_Command()
-            )
-            le_acl_data_packet_length = (
-                response.return_parameters.le_acl_data_packet_length
-            )
-            total_num_le_acl_data_packets = (
-                response.return_parameters.total_num_le_acl_data_packets
             )
+            le_acl_data_packet_length = response8.le_acl_data_packet_length
+            total_num_le_acl_data_packets = response8.total_num_le_acl_data_packets
 
             logger.debug(
                 'HCI LE ACL flow control: '
@@ -592,16 +597,16 @@ class Host(utils.EventEmitter):
         ) and self.supports_command(
             hci.HCI_LE_WRITE_SUGGESTED_DEFAULT_DATA_LENGTH_COMMAND
         ):
-            response = await self.send_command(
+            response9 = await self.send_sync_command(
                 hci.HCI_LE_Read_Suggested_Default_Data_Length_Command()
             )
-            suggested_max_tx_octets = response.return_parameters.suggested_max_tx_octets
+            suggested_max_tx_octets = response9.suggested_max_tx_octets
-            suggested_max_tx_time = response.return_parameters.suggested_max_tx_time
+            suggested_max_tx_time = response9.suggested_max_tx_time
             if (
                 suggested_max_tx_octets != self.suggested_max_tx_octets
                 or suggested_max_tx_time != self.suggested_max_tx_time
             ):
-                await self.send_command(
+                await self.send_sync_command(
                     hci.HCI_LE_Write_Suggested_Default_Data_Length_Command(
                         suggested_max_tx_octets=self.suggested_max_tx_octets,
                         suggested_max_tx_time=self.suggested_max_tx_time,
@@ -611,24 +616,28 @@ class Host(utils.EventEmitter):
         if self.supports_command(
             hci.HCI_LE_READ_NUMBER_OF_SUPPORTED_ADVERTISING_SETS_COMMAND
         ):
-            response = await self.send_command(
+            try:
-                hci.HCI_LE_Read_Number_Of_Supported_Advertising_Sets_Command(),
+                response10 = await self.send_sync_command(
-                check_result=True,
+                    hci.HCI_LE_Read_Number_Of_Supported_Advertising_Sets_Command()
-            )
+                )
-            self.number_of_supported_advertising_sets = (
+                self.number_of_supported_advertising_sets = (
-                response.return_parameters.num_supported_advertising_sets
+                    response10.num_supported_advertising_sets
-            )
+                )
+            except hci.HCI_Error:
+                logger.warning('Failed to read number of supported advertising sets')
 
         if self.supports_command(
             hci.HCI_LE_READ_MAXIMUM_ADVERTISING_DATA_LENGTH_COMMAND
         ):
-            response = await self.send_command(
+            try:
-                hci.HCI_LE_Read_Maximum_Advertising_Data_Length_Command(),
+                response11 = await self.send_sync_command(
-                check_result=True,
+                    hci.HCI_LE_Read_Maximum_Advertising_Data_Length_Command()
-            )
+                )
-            self.maximum_advertising_data_length = (
+                self.maximum_advertising_data_length = (
-                response.return_parameters.max_advertising_data_length
+                    response11.max_advertising_data_length
-            )
+                )
+            except hci.HCI_Error:
+                logger.warning('Failed to read maximum advertising data length')
 
     @property
     def controller(self) -> TransportSink | None:
@@ -654,56 +663,175 @@ class Host(utils.EventEmitter):
         if self.hci_sink:
             self.hci_sink.on_packet(bytes(packet))
 
-    async def send_command(
+    async def _send_command(
-        self, command, check_result=False, response_timeout: int | None = None
+        self,
-    ):
+        command: hci.HCI_SyncCommand | hci.HCI_AsyncCommand,
+        response_timeout: float | None = None,
+    ) -> hci.HCI_Command_Complete_Event | hci.HCI_Command_Status_Event:
         # Wait until we can send (only one pending command at a time)
-        async with self.command_semaphore:
+        await self.command_semaphore.acquire()
-            assert self.pending_command is None
-            assert self.pending_response is None
 
-            # Create a future value to hold the eventual response
+        # Create a future value to hold the eventual response
-            self.pending_response = asyncio.get_running_loop().create_future()
+        assert self.pending_command is None
-            self.pending_command = command
+        assert self.pending_response is None
+        self.pending_response = asyncio.get_running_loop().create_future()
+        self.pending_command = command
 
-            try:
+        response: (
-                self.send_hci_packet(command)
+            hci.HCI_Command_Complete_Event | hci.HCI_Command_Status_Event | None
-                await asyncio.wait_for(self.pending_response, timeout=response_timeout)
+        ) = None
-                response = self.pending_response.result()
+        try:
+            self.send_hci_packet(command)
+            response = await asyncio.wait_for(
+                self.pending_response, timeout=response_timeout
+            )
+            return response
+        except Exception:
+            logger.exception(color("!!! Exception while sending command:", "red"))
+            raise
+        finally:
+            self.pending_command = None
+            self.pending_response = None
+            if (
+                response is not None
+                and response.num_hci_command_packets
+                and self.command_semaphore.locked()
+            ):
+                self.command_semaphore.release()
 
-                # Check the return parameters if required
+    @overload
-                if check_result:
+    async def send_command(
-                    if isinstance(response, hci.HCI_Command_Status_Event):
+        self,
-                        status = response.status  # type: ignore[attr-defined]
+        command: hci.HCI_SyncCommand[_RP],
-                    elif isinstance(response.return_parameters, int):
+        check_result: bool = False,
-                        status = response.return_parameters
+        response_timeout: float | None = None,
-                    elif isinstance(response.return_parameters, bytes):
+    ) -> hci.HCI_Command_Complete_Event[_RP]: ...
-                        # return parameters first field is a one byte status code
-                        status = response.return_parameters[0]
-                    else:
-                        status = response.return_parameters.status
 
-                    if status != hci.HCI_SUCCESS:
+    @overload
-                        logger.warning(
+    async def send_command(
-                            f'{command.name} failed '
+        self,
-                            f'({hci.HCI_Constant.error_name(status)})'
+        command: hci.HCI_AsyncCommand,
-                        )
+        check_result: bool = False,
-                        raise hci.HCI_Error(status)
+        response_timeout: float | None = None,
+    ) -> hci.HCI_Command_Status_Event: ...
 
-                return response
+    async def send_command(
-            except Exception:
+        self,
-                logger.exception(color("!!! Exception while sending command:", "red"))
+        command: hci.HCI_SyncCommand[_RP] | hci.HCI_AsyncCommand,
-                raise
+        check_result: bool = False,
-            finally:
+        response_timeout: float | None = None,
-                self.pending_command = None
+    ) -> hci.HCI_Command_Complete_Event[_RP] | hci.HCI_Command_Status_Event:
-                self.pending_response = None
+        response = await self._send_command(command, response_timeout)
 
-    # Use this method to send a command from a task
+        # Check the return parameters if required
-    def send_command_sync(self, command: hci.HCI_Command) -> None:
+        if check_result:
-        async def send_command(command: hci.HCI_Command) -> None:
+            if isinstance(response, hci.HCI_Command_Status_Event):
-            await self.send_command(command)
+                status = response.status  # type: ignore[attr-defined]
+            elif isinstance(response.return_parameters, int):
+                status = response.return_parameters
+            elif isinstance(response.return_parameters, bytes):
+                # return parameters first field is a one byte status code
+                status = response.return_parameters[0]
+            elif isinstance(
+                response.return_parameters, hci.HCI_GenericReturnParameters
+            ):
+                # FIXME: temporary workaround
+                # NO STATUS
+                status = hci.HCI_SUCCESS
+            else:
+                status = response.return_parameters.status
 
-        asyncio.create_task(send_command(command))
+            if status != hci.HCI_SUCCESS:
+                logger.warning(
+                    f'{command.name} failed ' f'({hci.HCI_Constant.error_name(status)})'
+                )
+                raise hci.HCI_Error(status)
+
+        return response
+
+    async def send_sync_command(
+        self, command: hci.HCI_SyncCommand[_RP], response_timeout: float | None = None
+    ) -> _RP:
+        response = await self.send_sync_command_raw(command, response_timeout)
+        return_parameters = response.return_parameters
+
+        # Check the return parameters's status
+        if isinstance(return_parameters, hci.HCI_StatusReturnParameters):
+            status = return_parameters.status
+        elif isinstance(return_parameters, hci.HCI_GenericReturnParameters):
+            # if the payload has at least one byte, assume the first byte is the status
+            if not return_parameters.data:
+                raise RuntimeError('no status byte in return parameters')
+            status = hci.HCI_ErrorCode(return_parameters.data[0])
+        else:
+            raise RuntimeError(
+                f'unexpected return parameters type ({type(return_parameters)})'
+            )
+        if status != hci.HCI_ErrorCode.SUCCESS:
+            logger.warning(
+                f'{command.name} failed ' f'({hci.HCI_Constant.error_name(status)})'
+            )
+            raise hci.HCI_Error(status)
+
+        return return_parameters
+
+    async def send_sync_command_raw(
+        self,
+        command: hci.HCI_SyncCommand[_RP],
+        response_timeout: float | None = None,
+    ) -> hci.HCI_Command_Complete_Event[_RP]:
+        response = await self._send_command(command, response_timeout)
+
+        # For unknown HCI commands, some controllers return Command Status instead of
+        # Command Complete.
+        if (
+            isinstance(response, hci.HCI_Command_Status_Event)
+            and response.status == hci.HCI_ErrorCode.UNKNOWN_HCI_COMMAND_ERROR
+        ):
+            return hci.HCI_Command_Complete_Event(
+                num_hci_command_packets=response.num_hci_command_packets,
+                command_opcode=command.op_code,
+                return_parameters=hci.HCI_StatusReturnParameters(
+                    status=hci.HCI_ErrorCode(response.status)
+                ),  # type: ignore
+            )
+
+        # Check that the response is of the expected type
+        assert isinstance(response, hci.HCI_Command_Complete_Event)
+
+        return response
+
+    async def send_async_command(
+        self,
+        command: hci.HCI_AsyncCommand,
+        check_status: bool = True,
+        response_timeout: float | None = None,
+    ) -> hci.HCI_ErrorCode:
+        response = await self._send_command(command, response_timeout)
+
+        # For unknown HCI commands, some controllers return Command Complete instead of
+        # Command Status.
+        if isinstance(response, hci.HCI_Command_Complete_Event):
+            # Assume the first byte of the return parameters is the status
+            if (
+                status := hci.HCI_ErrorCode(response.parameters[3])
+            ) != hci.HCI_ErrorCode.UNKNOWN_HCI_COMMAND_ERROR:
+                logger.warning(f'unexpected return paramerers status {status}')
+        else:
+            assert isinstance(response, hci.HCI_Command_Status_Event)
+            status = hci.HCI_ErrorCode(response.status)
+
+        # Check the status if required
+        if check_status:
+            if status != hci.HCI_CommandStatus.PENDING:
+                logger.warning(f'{command.name} failed ' f'({status.name})')
+                raise hci.HCI_Error(status)
+
+        return status
+
+    @utils.deprecated("Use utils.AsyncRunner.spawn() instead.")
+    def send_command_sync(self, command: hci.HCI_AsyncCommand) -> None:
+        utils.AsyncRunner.spawn(self.send_async_command(command))
 
     def send_acl_sdu(self, connection_handle: int, sdu: bytes) -> None:
         if not (connection := self.connections.get(connection_handle)):
@@ -728,10 +856,22 @@ class Host(utils.EventEmitter):
                 data=pdu,
             )
             logger.debug(
-                '>>> ACL packet enqueue: (Handle=0x%04X) %s', connection_handle, pdu
+                '>>> ACL packet enqueue: (handle=0x%04X) %s',
+                connection_handle,
+                pdu.hex(),
             )
             packet_queue.enqueue(acl_packet, connection_handle)
 
+    def send_sco_sdu(self, connection_handle: int, sdu: bytes) -> None:
+        self.send_hci_packet(
+            hci.HCI_SynchronousDataPacket(
+                connection_handle=connection_handle,
+                packet_status=0,
+                data_total_length=len(sdu),
+                data=sdu,
+            )
+        )
+
     def send_l2cap_pdu(self, connection_handle: int, cid: int, pdu: bytes) -> None:
         self.send_acl_sdu(connection_handle, bytes(L2CAP_PDU(cid, pdu)))
 
@@ -816,16 +956,18 @@ class Host(utils.EventEmitter):
             if self.local_supported_commands & mask
         )
 
-    def supports_le_features(self, feature: hci.LeFeatureMask) -> bool:
+    def supports_le_features(self, features: hci.LeFeatureMask) -> bool:
-        return (self.local_le_features & feature) == feature
+        return (self.local_le_features & features) == features
 
-    def supports_lmp_features(self, feature: hci.LmpFeatureMask) -> bool:
+    def supports_lmp_features(self, features: hci.LmpFeatureMask) -> bool:
-        return self.local_lmp_features & (feature) == feature
+        return self.local_lmp_features & (features) == features
 
     @property
-    def supported_le_features(self):
+    def supported_le_features(self) -> list[hci.LeFeature]:
         return [
-            feature for feature in range(64) if self.local_le_features & (1 << feature)
+            feature
+            for feature in hci.LeFeature
+            if self.local_le_features & (1 << feature)
         ]
 
     # Packet Sink protocol (packets coming from the controller via HCI)
@@ -914,6 +1056,8 @@ class Host(utils.EventEmitter):
             self.pending_response.set_result(event)
         else:
             logger.warning('!!! no pending response future to set')
+            if event.num_hci_command_packets and self.command_semaphore.locked():
+                self.command_semaphore.release()
 
     ############################################################
     # HCI handlers
@@ -925,7 +1069,13 @@ class Host(utils.EventEmitter):
         if event.command_opcode == 0:
             # This is used just for the Num_HCI_Command_Packets field, not related to
             # an actual command
-            logger.debug('no-command event')
+            logger.debug('no-command event for flow control')
+
+            # Release the command semaphore if needed
+            if event.num_hci_command_packets and self.command_semaphore.locked():
+                logger.debug('command complete event releasing semaphore')
+                self.command_semaphore.release()
+
             return
 
         return self.on_command_processed(event)
@@ -1106,7 +1256,7 @@ class Host(utils.EventEmitter):
         self, event: hci.HCI_LE_Connection_Update_Complete_Event
     ):
         if (connection := self.connections.get(event.connection_handle)) is None:
-            logger.warning('!!! CONNECTION PARAMETERS UPDATE COMPLETE: unknown handle')
+            logger.warning('!!! CONNECTION UPDATE COMPLETE: unknown handle')
             return
 
         # Notify the client
@@ -1123,6 +1273,29 @@ class Host(utils.EventEmitter):
                 'connection_parameters_update_failure', connection.handle, event.status
             )
 
+    def on_hci_le_connection_rate_change_event(
+        self, event: hci.HCI_LE_Connection_Rate_Change_Event
+    ):
+        if (connection := self.connections.get(event.connection_handle)) is None:
+            logger.warning('!!! CONNECTION RATE CHANGE: unknown handle')
+            return
+
+        # Notify the client
+        if event.status == hci.HCI_SUCCESS:
+            self.emit(
+                'le_connection_rate_change',
+                connection.handle,
+                event.connection_interval,
+                event.subrate_factor,
+                event.peripheral_latency,
+                event.continuation_number,
+                event.supervision_timeout,
+            )
+        else:
+            self.emit(
+                'le_connection_rate_change_failure', connection.handle, event.status
+            )
+
     def on_hci_le_phy_update_complete_event(
         self, event: hci.HCI_LE_PHY_Update_Complete_Event
     ):
@@ -1338,15 +1511,17 @@ class Host(utils.EventEmitter):
 
         # For now, just accept everything
         # TODO: delegate the decision
-        self.send_command_sync(
+        utils.AsyncRunner.spawn(
-            hci.HCI_LE_Remote_Connection_Parameter_Request_Reply_Command(
+            self.send_sync_command(
-                connection_handle=event.connection_handle,
+                hci.HCI_LE_Remote_Connection_Parameter_Request_Reply_Command(
-                interval_min=event.interval_min,
+                    connection_handle=event.connection_handle,
-                interval_max=event.interval_max,
+                    interval_min=event.interval_min,
-                max_latency=event.max_latency,
+                    interval_max=event.interval_max,
-                timeout=event.timeout,
+                    max_latency=event.max_latency,
-                min_ce_length=0,
+                    timeout=event.timeout,
-                max_ce_length=0,
+                    min_ce_length=0,
+                    max_ce_length=0,
+                )
             )
         )
 
@@ -1382,9 +1557,9 @@ class Host(utils.EventEmitter):
                     connection_handle=event.connection_handle
                 )
 
-            await self.send_command(response)
+            await self.send_sync_command(response)
 
-        asyncio.create_task(send_long_term_key())
+        utils.AsyncRunner.spawn(send_long_term_key())
 
     def on_hci_synchronous_connection_complete_event(
         self, event: hci.HCI_Synchronous_Connection_Complete_Event
@@ -1583,9 +1758,9 @@ class Host(utils.EventEmitter):
                     bd_addr=event.bd_addr
                 )
 
-            await self.send_command(response)
+            await self.send_sync_command(response)
 
-        asyncio.create_task(send_link_key())
+        utils.AsyncRunner.spawn(send_link_key())
 
     def on_hci_io_capability_request_event(
         self, event: hci.HCI_IO_Capability_Request_Event
@@ -1680,12 +1855,13 @@ class Host(utils.EventEmitter):
             self.emit(
                 'le_remote_features_failure', event.connection_handle, event.status
             )
-        else:
+            return
-            self.emit(
+
-                'le_remote_features',
+        self.emit(
-                event.connection_handle,
+            'le_remote_features',
-                int.from_bytes(event.le_features, 'little'),
+            event.connection_handle,
-            )
+            hci.LeFeatureMask(int.from_bytes(event.le_features, 'little')),
+        )
 
     def on_hci_le_cs_read_remote_supported_capabilities_complete_event(
         self, event: hci.HCI_LE_CS_Read_Remote_Supported_Capabilities_Complete_Event
@@ -1718,6 +1894,12 @@ class Host(utils.EventEmitter):
         self.emit('cs_subevent_result_continue', event)
 
     def on_hci_le_subrate_change_event(self, event: hci.HCI_LE_Subrate_Change_Event):
+        if event.status != hci.HCI_SUCCESS:
+            self.emit(
+                'le_subrate_change_failure', event.connection_handle, event.status
+            )
+            return
+
         self.emit(
             'le_subrate_change',
             event.connection_handle,

bumble/l2cap.py

@@ -20,6 +20,7 @@ from __future__ import annotations
 import asyncio
 import dataclasses
 import enum
+import itertools
 import logging
 import struct
 from collections import deque
@@ -302,11 +303,9 @@ class EnhancedControlField(ControlField):
 
 @dataclasses.dataclass
 class InformationEnhancedControlField(EnhancedControlField):
-    tx_seq: int = 0
+    tx_seq: int
+    sar: int
     req_seq: int = 0
-    segmentation_and_reassembly: int = (
-        EnhancedControlField.SegmentationAndReassembly.UNSEGMENTED
-    )
     final: int = 1
 
     frame_type = EnhancedControlField.FieldType.I_FRAME
@@ -316,15 +315,15 @@ class InformationEnhancedControlField(EnhancedControlField):
         return cls(
             tx_seq=(data[0] >> 1) & 0b0111111,
             final=(data[0] >> 7) & 0b1,
-            req_seq=(data[1] & 0b001111111),
+            req_seq=(data[1] & 0b00111111),
-            segmentation_and_reassembly=(data[1] >> 6) & 0b11,
+            sar=(data[1] >> 6) & 0b11,
         )
 
     def __bytes__(self) -> bytes:
         return bytes(
             [
                 self.frame_type | (self.tx_seq << 1) | (self.final << 7),
-                self.req_seq | (self.segmentation_and_reassembly << 6),
+                self.req_seq | (self.sar << 6),
             ]
         )
 
@@ -889,27 +888,38 @@ class EnhancedRetransmissionProcessor(Processor):
     class _PendingPdu:
         payload: bytes
         tx_seq: int
+        sar: InformationEnhancedControlField.SegmentationAndReassembly
+        sdu_length: int = 0
         req_seq: int = 0
 
         def __bytes__(self) -> bytes:
             return (
                 bytes(
                     InformationEnhancedControlField(
-                        tx_seq=self.tx_seq, req_seq=self.req_seq
+                        tx_seq=self.tx_seq,
+                        req_seq=self.req_seq,
+                        sar=self.sar,
                     )
                 )
+                + (
+                    struct.pack('<H', self.sdu_length)
+                    if self.sar
+                    == InformationEnhancedControlField.SegmentationAndReassembly.START
+                    else b''
+                )
                 + self.payload
             )
 
-    _expected_ack_seq: int = 0
+    _last_acked_tx_seq: int = 0
+    _last_acked_rx_seq: int = 0
     _next_tx_seq: int = 0
-    _last_tx_seq: int = 0
     _req_seq_num: int = 0
-    _next_seq_num: int = 0
     _remote_is_busy: bool = False
+    _in_sdu: bytes = b''
 
     _num_receiver_ready_polls_sent: int = 0
     _pending_pdus: list[_PendingPdu]
+    _tx_window: list[_PendingPdu]
     _monitor_handle: asyncio.TimerHandle | None = None
     _receiver_ready_poll_handle: asyncio.TimerHandle | None = None
 
@@ -917,12 +927,6 @@ class EnhancedRetransmissionProcessor(Processor):
     monitor_timeout: float
     retransmission_timeout: float
 
-    @classmethod
-    def _num_frames_between(cls, low: int, high: int) -> int:
-        if high < low:
-            high += cls.MAX_SEQ_NUM
-        return high - low
-
     def __init__(
         self,
         channel: ClassicChannel,
@@ -935,6 +939,7 @@ class EnhancedRetransmissionProcessor(Processor):
         self.peer_mps = peer_mps
         self.peer_tx_window_size = peer_tx_window_size
         self._pending_pdus = []
+        self._tx_window = []
         self.monitor_timeout = spec.monitor_timeout
         self.channel = channel
         self.retransmission_timeout = spec.retransmission_timeout
@@ -972,12 +977,9 @@ class EnhancedRetransmissionProcessor(Processor):
 
     def _send_receiver_ready_poll(self) -> None:
         self._num_receiver_ready_polls_sent += 1
-        self.channel.send_pdu(
+        self._send_s_frame(
-            SupervisoryEnhancedControlField(
+            supervision_function=SupervisoryEnhancedControlField.SupervisoryFunction.RR,
-                supervision_function=SupervisoryEnhancedControlField.SupervisoryFunction.RR,
+            final=1,
-                final=1,
-                req_seq=self._next_seq_num,
-            )
         )
 
     def _get_next_tx_seq(self) -> int:
@@ -987,12 +989,35 @@ class EnhancedRetransmissionProcessor(Processor):
 
     @override
     def send_sdu(self, sdu: bytes) -> None:
-        if len(sdu) > self.peer_mps:
+        if len(sdu) <= self.peer_mps:
-            raise InvalidArgumentError(
+            pdu = self._PendingPdu(
-                f'SDU size({len(sdu)}) exceeds channel MPS {self.peer_mps}'
+                payload=sdu,
+                tx_seq=self._get_next_tx_seq(),
+                req_seq=self._req_seq_num,
+                sar=InformationEnhancedControlField.SegmentationAndReassembly.UNSEGMENTED,
             )
-        pdu = self._PendingPdu(payload=sdu, tx_seq=self._get_next_tx_seq())
+            self._pending_pdus.append(pdu)
-        self._pending_pdus.append(pdu)
+        else:
+            for offset in range(0, len(sdu), self.peer_mps):
+                payload = sdu[offset : offset + self.peer_mps]
+                if offset == 0:
+                    sar = (
+                        InformationEnhancedControlField.SegmentationAndReassembly.START
+                    )
+                elif offset + len(payload) >= len(sdu):
+                    sar = InformationEnhancedControlField.SegmentationAndReassembly.END
+                else:
+                    sar = (
+                        InformationEnhancedControlField.SegmentationAndReassembly.CONTINUATION
+                    )
+                pdu = self._PendingPdu(
+                    payload=payload,
+                    tx_seq=self._get_next_tx_seq(),
+                    req_seq=self._req_seq_num,
+                    sar=sar,
+                    sdu_length=len(sdu),
+                )
+                self._pending_pdus.append(pdu)
         self._process_output()
 
     @override
@@ -1000,17 +1025,37 @@ class EnhancedRetransmissionProcessor(Processor):
         control_field = EnhancedControlField.from_bytes(pdu)
         self._update_ack_seq(control_field.req_seq, control_field.final != 0)
         if isinstance(control_field, InformationEnhancedControlField):
-            if control_field.tx_seq != self._next_seq_num:
+            if control_field.tx_seq != self._req_seq_num:
+                logger.error(
+                    "tx_seq != self._req_seq_num, tx_seq: %d, self._req_seq_num: %d",
+                    control_field.tx_seq,
+                    self._req_seq_num,
+                )
                 return
-            self._next_seq_num = (self._next_seq_num + 1) % self.MAX_SEQ_NUM
+            self._req_seq_num = (control_field.tx_seq + 1) % self.MAX_SEQ_NUM
-            self._req_seq_num = self._next_seq_num
 
-            ack_frame = SupervisoryEnhancedControlField(
+            if (
-                supervision_function=SupervisoryEnhancedControlField.SupervisoryFunction.RR,
+                control_field.sar
-                req_seq=self._next_seq_num,
+                == InformationEnhancedControlField.SegmentationAndReassembly.START
-            )
+            ):
-            self.channel.send_pdu(ack_frame)
+                # Drop Control Field(2) + SDU Length(2)
-            self.channel.on_sdu(pdu[2:])
+                self._in_sdu += pdu[4:]
+            else:
+                # Drop Control Field(2)
+                self._in_sdu += pdu[2:]
+            if control_field.sar in (
+                InformationEnhancedControlField.SegmentationAndReassembly.END,
+                InformationEnhancedControlField.SegmentationAndReassembly.UNSEGMENTED,
+            ):
+                self.channel.on_sdu(self._in_sdu)
+                self._in_sdu = b''
+
+            # If sink doesn't trigger any I-frame, ack this frame.
+            if self._req_seq_num != self._last_acked_rx_seq:
+                self._send_s_frame(
+                    supervision_function=SupervisoryEnhancedControlField.SupervisoryFunction.RR,
+                    final=0,
+                )
         elif isinstance(control_field, SupervisoryEnhancedControlField):
             self._remote_is_busy = (
                 control_field.supervision_function
@@ -1022,56 +1067,66 @@ class EnhancedRetransmissionProcessor(Processor):
                 SupervisoryEnhancedControlField.SupervisoryFunction.RNR,
             ):
                 if control_field.poll:
-                    self.channel.send_pdu(
+                    self._send_s_frame(
-                        SupervisoryEnhancedControlField(
+                        supervision_function=SupervisoryEnhancedControlField.SupervisoryFunction.RR,
-                            supervision_function=SupervisoryEnhancedControlField.SupervisoryFunction.RR,
+                        final=1,
-                            final=1,
-                            req_seq=self._next_seq_num,
-                        )
                     )
             else:
                 # TODO: Handle Retransmission.
                 pass
 
     def _process_output(self) -> None:
-        if self._remote_is_busy or self._monitor_handle:
+        if self._remote_is_busy:
+            logger.debug("Remote is busy")
+            return
+        if self._monitor_handle:
+            logger.debug("Monitor handle is not None")
             return
 
-        for pdu in self._pending_pdus:
+        pdu_to_send = self.peer_tx_window_size - len(self._tx_window)
-            if self._num_unacked_frames >= self.peer_tx_window_size:
+        for pdu in itertools.islice(self._pending_pdus, pdu_to_send):
-                return
+            self._send_i_frame(pdu)
-            self._send_pdu(pdu)
+        self._pending_pdus = self._pending_pdus[pdu_to_send:]
-            self._last_tx_seq = pdu.tx_seq
 
-    @property
+    def _send_i_frame(self, pdu: _PendingPdu) -> None:
-    def _num_unacked_frames(self) -> int:
-        if not self._pending_pdus:
-            return 0
-        return self._num_frames_between(self._expected_ack_seq, self._last_tx_seq + 1)
-
-    def _send_pdu(self, pdu: _PendingPdu) -> None:
         pdu.req_seq = self._req_seq_num
 
         self._start_receiver_ready_poll()
+        self._tx_window.append(pdu)
         self.channel.send_pdu(bytes(pdu))
+        self._last_acked_rx_seq = self._req_seq_num
+
+    def _send_s_frame(
+        self,
+        supervision_function: SupervisoryEnhancedControlField.SupervisoryFunction,
+        final: int,
+    ) -> None:
+        self.channel.send_pdu(
+            SupervisoryEnhancedControlField(
+                supervision_function=supervision_function,
+                final=final,
+                req_seq=self._req_seq_num,
+            )
+        )
+        self._last_acked_rx_seq = self._req_seq_num
 
     def _update_ack_seq(self, new_seq: int, is_poll_response: bool) -> None:
-        num_frames_acked = self._num_frames_between(self._expected_ack_seq, new_seq)
+        num_frames_acked = (new_seq - self._last_acked_tx_seq) % self.MAX_SEQ_NUM
-        if num_frames_acked > self._num_unacked_frames:
+        if num_frames_acked > len(self._tx_window):
             logger.error(
                 "Received acknowledgment for %d frames but only %d frames are pending",
                 num_frames_acked,
-                self._num_unacked_frames,
+                len(self._tx_window),
             )
             return
         if is_poll_response and self._monitor_handle:
             self._monitor_handle.cancel()
             self._monitor_handle = None
 
-        del self._pending_pdus[:num_frames_acked]
+        del self._tx_window[:num_frames_acked]
-        self._expected_ack_seq = new_seq
+        self._last_acked_tx_seq = new_seq
         if (
-            self._expected_ack_seq == self._next_tx_seq
+            self._last_acked_tx_seq == self._next_tx_seq
             and self._receiver_ready_poll_handle
         ):
             self._receiver_ready_poll_handle.cancel()
@@ -1592,7 +1647,9 @@ class LeCreditBasedChannel(utils.EventEmitter):
         self.connection_result = None
         self.disconnection_result = None
         self.drained = asyncio.Event()
-        self.att_mtu = 0  # Filled by GATT client or server later.
+        # Core Specification Vol 3, Part G, 5.3.1 ATT_MTU
+        # ATT_MTU shall be set to the minimum of the MTU field values of the two devices.
+        self.att_mtu = min(mtu, peer_mtu)
 
         self.drained.set()
 
@@ -2285,8 +2342,8 @@ class ChannelManager:
                     cid,
                     L2CAP_Connection_Response(
                         identifier=request.identifier,
-                        destination_cid=request.source_cid,
+                        destination_cid=0,
-                        source_cid=0,
+                        source_cid=request.source_cid,
                         result=L2CAP_Connection_Response.Result.CONNECTION_REFUSED_NO_RESOURCES_AVAILABLE,
                         status=0x0000,
                     ),
@@ -2298,7 +2355,12 @@ class ChannelManager:
                 f'creating server channel with cid={source_cid} for psm {request.psm}'
             )
             channel = ClassicChannel(
-                self, connection, cid, request.psm, source_cid, server.spec
+                manager=self,
+                connection=connection,
+                signaling_cid=cid,
+                psm=request.psm,
+                source_cid=source_cid,
+                spec=server.spec,
             )
             connection_channels[source_cid] = channel
 
@@ -2315,8 +2377,8 @@ class ChannelManager:
                 cid,
                 L2CAP_Connection_Response(
                     identifier=request.identifier,
-                    destination_cid=request.source_cid,
+                    destination_cid=0,
-                    source_cid=0,
+                    source_cid=request.source_cid,
                     result=L2CAP_Connection_Response.Result.CONNECTION_REFUSED_PSM_NOT_SUPPORTED,
                     status=0x0000,
                 ),

bumble/pandora/l2cap.py

@@ -278,7 +278,7 @@ class L2CAPService(L2CAPServicer):
             if not l2cap_channel:
                 return SendResponse(error=COMMAND_NOT_UNDERSTOOD)
             if isinstance(l2cap_channel, ClassicChannel):
-                l2cap_channel.send_pdu(request.data)
+                l2cap_channel.write(request.data)
             else:
                 l2cap_channel.write(request.data)
             return SendResponse(success=empty_pb2.Empty())

bumble/profiles/battery_service.py

@@ -16,35 +16,28 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+from collections.abc import Callable
 
-from bumble.gatt import (
+from bumble import device, gatt, gatt_adapters, gatt_client
-    GATT_BATTERY_LEVEL_CHARACTERISTIC,
-    GATT_BATTERY_SERVICE,
-    Characteristic,
-    CharacteristicValue,
-    TemplateService,
-)
-from bumble.gatt_adapters import (
-    PackedCharacteristicAdapter,
-    PackedCharacteristicProxyAdapter,
-)
-from bumble.gatt_client import CharacteristicProxy, ProfileServiceProxy
 
 
 # -----------------------------------------------------------------------------
-class BatteryService(TemplateService):
+class BatteryService(gatt.TemplateService):
-    UUID = GATT_BATTERY_SERVICE
+    UUID = gatt.GATT_BATTERY_SERVICE
     BATTERY_LEVEL_FORMAT = 'B'
 
-    battery_level_characteristic: Characteristic[int]
+    battery_level_characteristic: gatt.Characteristic[int]
 
-    def __init__(self, read_battery_level):
+    def __init__(self, read_battery_level: Callable[[device.Connection], int]) -> None:
-        self.battery_level_characteristic = PackedCharacteristicAdapter(
+        self.battery_level_characteristic = gatt_adapters.PackedCharacteristicAdapter(
-            Characteristic(
+            gatt.Characteristic(
-                GATT_BATTERY_LEVEL_CHARACTERISTIC,
+                gatt.GATT_BATTERY_LEVEL_CHARACTERISTIC,
-                Characteristic.Properties.READ | Characteristic.Properties.NOTIFY,
+                properties=(
-                Characteristic.READABLE,
+                    gatt.Characteristic.Properties.READ
-                CharacteristicValue(read=read_battery_level),
+                    | gatt.Characteristic.Properties.NOTIFY
+                ),
+                permissions=gatt.Characteristic.READABLE,
+                value=gatt.CharacteristicValue(read=read_battery_level),
             ),
             pack_format=BatteryService.BATTERY_LEVEL_FORMAT,
         )
@@ -52,19 +45,17 @@ class BatteryService(TemplateService):
 
 
 # -----------------------------------------------------------------------------
-class BatteryServiceProxy(ProfileServiceProxy):
+class BatteryServiceProxy(gatt_client.ProfileServiceProxy):
     SERVICE_CLASS = BatteryService
 
-    battery_level: CharacteristicProxy[int] | None
+    battery_level: gatt_client.CharacteristicProxy[int]
 
-    def __init__(self, service_proxy):
+    def __init__(self, service_proxy: gatt_client.ServiceProxy) -> None:
         self.service_proxy = service_proxy
 
-        if characteristics := service_proxy.get_characteristics_by_uuid(
+        self.battery_level = gatt_adapters.PackedCharacteristicProxyAdapter(
-            GATT_BATTERY_LEVEL_CHARACTERISTIC
+            service_proxy.get_required_characteristic_by_uuid(
-        ):
+                gatt.GATT_BATTERY_LEVEL_CHARACTERISTIC
-            self.battery_level = PackedCharacteristicProxyAdapter(
+            ),
-                characteristics[0], pack_format=BatteryService.BATTERY_LEVEL_FORMAT
+            pack_format=BatteryService.BATTERY_LEVEL_FORMAT,
-            )
+        )
-        else:
-            self.battery_level = None

bumble/profiles/heart_rate_service.py

@@ -18,40 +18,30 @@
 # -----------------------------------------------------------------------------
 from __future__ import annotations
 
+import dataclasses
+import enum
 import struct
-from enum import IntEnum
+from collections.abc import Callable, Sequence
+from typing import Any
 
-from bumble import core
+from typing_extensions import Self
-from bumble.att import ATT_Error
+
-from bumble.gatt import (
+from bumble import att, core, device, gatt, gatt_adapters, gatt_client, utils
-    GATT_BODY_SENSOR_LOCATION_CHARACTERISTIC,
-    GATT_HEART_RATE_CONTROL_POINT_CHARACTERISTIC,
-    GATT_HEART_RATE_MEASUREMENT_CHARACTERISTIC,
-    GATT_HEART_RATE_SERVICE,
-    Characteristic,
-    CharacteristicValue,
-    TemplateService,
-)
-from bumble.gatt_adapters import (
-    DelegatedCharacteristicAdapter,
-    PackedCharacteristicAdapter,
-    SerializableCharacteristicAdapter,
-)
-from bumble.gatt_client import CharacteristicProxy, ProfileServiceProxy
 
 
 # -----------------------------------------------------------------------------
-class HeartRateService(TemplateService):
+class HeartRateService(gatt.TemplateService):
-    UUID = GATT_HEART_RATE_SERVICE
+    UUID = gatt.GATT_HEART_RATE_SERVICE
+
     HEART_RATE_CONTROL_POINT_FORMAT = 'B'
     CONTROL_POINT_NOT_SUPPORTED = 0x80
     RESET_ENERGY_EXPENDED = 0x01
 
-    heart_rate_measurement_characteristic: Characteristic[HeartRateMeasurement]
+    heart_rate_measurement_characteristic: gatt.Characteristic[HeartRateMeasurement]
-    body_sensor_location_characteristic: Characteristic[BodySensorLocation]
+    body_sensor_location_characteristic: gatt.Characteristic[BodySensorLocation]
-    heart_rate_control_point_characteristic: Characteristic[int]
+    heart_rate_control_point_characteristic: gatt.Characteristic[int]
 
-    class BodySensorLocation(IntEnum):
+    class BodySensorLocation(utils.OpenIntEnum):
         OTHER = 0
         CHEST = 1
         WRIST = 2
@@ -60,82 +50,90 @@ class HeartRateService(TemplateService):
         EAR_LOBE = 5
         FOOT = 6
 
+    @dataclasses.dataclass
     class HeartRateMeasurement:
-        def __init__(
+        heart_rate: int
-            self,
+        sensor_contact_detected: bool | None = None
-            heart_rate,
+        energy_expended: int | None = None
-            sensor_contact_detected=None,
+        rr_intervals: Sequence[float] | None = None
-            energy_expended=None,
+
-            rr_intervals=None,
+        class Flag(enum.IntFlag):
-        ):
+            INT16_HEART_RATE = 1 << 0
-            if heart_rate < 0 or heart_rate > 0xFFFF:
+            SENSOR_CONTACT_DETECTED = 1 << 1
+            SENSOR_CONTACT_SUPPORTED = 1 << 2
+            ENERGY_EXPENDED_STATUS = 1 << 3
+            RR_INTERVAL = 1 << 4
+
+        def __post_init__(self) -> None:
+            if self.heart_rate < 0 or self.heart_rate > 0xFFFF:
                 raise core.InvalidArgumentError('heart_rate out of range')
 
-            if energy_expended is not None and (
+            if self.energy_expended is not None and (
-                energy_expended < 0 or energy_expended > 0xFFFF
+                self.energy_expended < 0 or self.energy_expended > 0xFFFF
             ):
                 raise core.InvalidArgumentError('energy_expended out of range')
 
-            if rr_intervals:
+            if self.rr_intervals:
-                for rr_interval in rr_intervals:
+                for rr_interval in self.rr_intervals:
                     if rr_interval < 0 or rr_interval * 1024 > 0xFFFF:
                         raise core.InvalidArgumentError('rr_intervals out of range')
 
-            self.heart_rate = heart_rate
-            self.sensor_contact_detected = sensor_contact_detected
-            self.energy_expended = energy_expended
-            self.rr_intervals = rr_intervals
-
         @classmethod
-        def from_bytes(cls, data):
+        def from_bytes(cls, data: bytes) -> Self:
             flags = data[0]
             offset = 1
 
-            if flags & 1:
+            if flags & cls.Flag.INT16_HEART_RATE:
-                hr = struct.unpack_from('<H', data, offset)[0]
+                heart_rate = struct.unpack_from('<H', data, offset)[0]
                 offset += 2
             else:
-                hr = struct.unpack_from('B', data, offset)[0]
+                heart_rate = struct.unpack_from('B', data, offset)[0]
                 offset += 1
 
-            if flags & (1 << 2):
+            if flags & cls.Flag.SENSOR_CONTACT_SUPPORTED:
-                sensor_contact_detected = flags & (1 << 1) != 0
+                sensor_contact_detected = flags & cls.Flag.SENSOR_CONTACT_DETECTED != 0
             else:
                 sensor_contact_detected = None
 
-            if flags & (1 << 3):
+            if flags & cls.Flag.ENERGY_EXPENDED_STATUS:
                 energy_expended = struct.unpack_from('<H', data, offset)[0]
                 offset += 2
             else:
                 energy_expended = None
 
-            if flags & (1 << 4):
+            rr_intervals: Sequence[float] | None = None
+            if flags & cls.Flag.RR_INTERVAL:
                 rr_intervals = tuple(
-                    struct.unpack_from('<H', data, offset + i * 2)[0] / 1024
+                    struct.unpack_from('<H', data, i)[0] / 1024
-                    for i in range((len(data) - offset) // 2)
+                    for i in range(offset, len(data), 2)
                 )
-            else:
-                rr_intervals = ()
 
-            return cls(hr, sensor_contact_detected, energy_expended, rr_intervals)
+            return cls(
+                heart_rate=heart_rate,
+                sensor_contact_detected=sensor_contact_detected,
+                energy_expended=energy_expended,
+                rr_intervals=rr_intervals,
+            )
 
-        def __bytes__(self):
+        def __bytes__(self) -> bytes:
+            flags = 0
             if self.heart_rate < 256:
-                flags = 0
                 data = struct.pack('B', self.heart_rate)
             else:
-                flags = 1
+                flags |= self.Flag.INT16_HEART_RATE
                 data = struct.pack('<H', self.heart_rate)
 
             if self.sensor_contact_detected is not None:
-                flags |= ((1 if self.sensor_contact_detected else 0) << 1) | (1 << 2)
+                flags |= self.Flag.SENSOR_CONTACT_SUPPORTED
+                if self.sensor_contact_detected:
+                    flags |= self.Flag.SENSOR_CONTACT_DETECTED
 
             if self.energy_expended is not None:
-                flags |= 1 << 3
+                flags |= self.Flag.ENERGY_EXPENDED_STATUS
                 data += struct.pack('<H', self.energy_expended)
 
-            if self.rr_intervals:
+            if self.rr_intervals is not None:
-                flags |= 1 << 4
+                flags |= self.Flag.RR_INTERVAL
                 data += b''.join(
                     [
                         struct.pack('<H', int(rr_interval * 1024))
@@ -145,57 +143,67 @@ class HeartRateService(TemplateService):
 
             return bytes([flags]) + data
 
-        def __str__(self):
-            return (
-                f'HeartRateMeasurement(heart_rate={self.heart_rate},'
-                f' sensor_contact_detected={self.sensor_contact_detected},'
-                f' energy_expended={self.energy_expended},'
-                f' rr_intervals={self.rr_intervals})'
-            )
-
     def __init__(
         self,
-        read_heart_rate_measurement,
+        read_heart_rate_measurement: Callable[
-        body_sensor_location=None,
+            [device.Connection], HeartRateMeasurement
-        reset_energy_expended=None,
+        ],
+        body_sensor_location: HeartRateService.BodySensorLocation | None = None,
+        reset_energy_expended: Callable[[device.Connection], Any] | None = None,
     ):
-        self.heart_rate_measurement_characteristic = SerializableCharacteristicAdapter(
+        self.heart_rate_measurement_characteristic = (
-            Characteristic(
+            gatt_adapters.SerializableCharacteristicAdapter(
-                GATT_HEART_RATE_MEASUREMENT_CHARACTERISTIC,
+                gatt.Characteristic(
-                Characteristic.Properties.NOTIFY,
+                    uuid=gatt.GATT_HEART_RATE_MEASUREMENT_CHARACTERISTIC,
-                0,
+                    properties=gatt.Characteristic.Properties.NOTIFY,
-                CharacteristicValue(read=read_heart_rate_measurement),
+                    permissions=gatt.Characteristic.Permissions(0),
-            ),
+                    value=gatt.CharacteristicValue(read=read_heart_rate_measurement),
-            HeartRateService.HeartRateMeasurement,
+                ),
+                HeartRateService.HeartRateMeasurement,
+            )
         )
-        characteristics = [self.heart_rate_measurement_characteristic]
+        characteristics: list[gatt.Characteristic] = [
+            self.heart_rate_measurement_characteristic
+        ]
 
         if body_sensor_location is not None:
-            self.body_sensor_location_characteristic = Characteristic(
+            self.body_sensor_location_characteristic = (
-                GATT_BODY_SENSOR_LOCATION_CHARACTERISTIC,
+                gatt_adapters.EnumCharacteristicAdapter(
-                Characteristic.Properties.READ,
+                    gatt.Characteristic(
-                Characteristic.READABLE,
+                        uuid=gatt.GATT_BODY_SENSOR_LOCATION_CHARACTERISTIC,
-                bytes([int(body_sensor_location)]),
+                        properties=gatt.Characteristic.Properties.READ,
+                        permissions=gatt.Characteristic.READABLE,
+                        value=body_sensor_location,
+                    ),
+                    cls=self.BodySensorLocation,
+                    length=1,
+                )
             )
             characteristics.append(self.body_sensor_location_characteristic)
 
         if reset_energy_expended:
 
-            def write_heart_rate_control_point_value(connection, value):
+            def write_heart_rate_control_point_value(
+                connection: device.Connection, value: bytes
+            ) -> None:
                 if value == self.RESET_ENERGY_EXPENDED:
                     if reset_energy_expended is not None:
                         reset_energy_expended(connection)
                 else:
-                    raise ATT_Error(self.CONTROL_POINT_NOT_SUPPORTED)
+                    raise att.ATT_Error(self.CONTROL_POINT_NOT_SUPPORTED)
 
-            self.heart_rate_control_point_characteristic = PackedCharacteristicAdapter(
+            self.heart_rate_control_point_characteristic = (
-                Characteristic(
+                gatt_adapters.PackedCharacteristicAdapter(
-                    GATT_HEART_RATE_CONTROL_POINT_CHARACTERISTIC,
+                    gatt.Characteristic(
-                    Characteristic.Properties.WRITE,
+                        uuid=gatt.GATT_HEART_RATE_CONTROL_POINT_CHARACTERISTIC,
-                    Characteristic.WRITEABLE,
+                        properties=gatt.Characteristic.Properties.WRITE,
-                    CharacteristicValue(write=write_heart_rate_control_point_value),
+                        permissions=gatt.Characteristic.WRITEABLE,
-                ),
+                        value=gatt.CharacteristicValue(
-                pack_format=HeartRateService.HEART_RATE_CONTROL_POINT_FORMAT,
+                            write=write_heart_rate_control_point_value
+                        ),
+                    ),
+                    pack_format=HeartRateService.HEART_RATE_CONTROL_POINT_FORMAT,
+                )
             )
             characteristics.append(self.heart_rate_control_point_characteristic)
 
@@ -203,50 +211,51 @@ class HeartRateService(TemplateService):
 
 
 # -----------------------------------------------------------------------------
-class HeartRateServiceProxy(ProfileServiceProxy):
+class HeartRateServiceProxy(gatt_client.ProfileServiceProxy):
     SERVICE_CLASS = HeartRateService
 
-    heart_rate_measurement: (
+    heart_rate_measurement: gatt_client.CharacteristicProxy[
-        CharacteristicProxy[HeartRateService.HeartRateMeasurement] | None
+        HeartRateService.HeartRateMeasurement
-    )
+    ]
     body_sensor_location: (
-        CharacteristicProxy[HeartRateService.BodySensorLocation] | None
+        gatt_client.CharacteristicProxy[HeartRateService.BodySensorLocation] | None
     )
-    heart_rate_control_point: CharacteristicProxy[int] | None
+    heart_rate_control_point: gatt_client.CharacteristicProxy[int] | None
 
-    def __init__(self, service_proxy):
+    def __init__(self, service_proxy: gatt_client.ServiceProxy) -> None:
         self.service_proxy = service_proxy
 
-        if characteristics := service_proxy.get_characteristics_by_uuid(
+        self.heart_rate_measurement = (
-            GATT_HEART_RATE_MEASUREMENT_CHARACTERISTIC
+            gatt_adapters.SerializableCharacteristicProxyAdapter(
-        ):
+                service_proxy.get_required_characteristic_by_uuid(
-            self.heart_rate_measurement = SerializableCharacteristicAdapter(
+                    gatt.GATT_HEART_RATE_MEASUREMENT_CHARACTERISTIC
-                characteristics[0], HeartRateService.HeartRateMeasurement
+                ),
+                HeartRateService.HeartRateMeasurement,
             )
-        else:
+        )
-            self.heart_rate_measurement = None
 
         if characteristics := service_proxy.get_characteristics_by_uuid(
-            GATT_BODY_SENSOR_LOCATION_CHARACTERISTIC
+            gatt.GATT_BODY_SENSOR_LOCATION_CHARACTERISTIC
         ):
-            self.body_sensor_location = DelegatedCharacteristicAdapter(
+            self.body_sensor_location = gatt_adapters.EnumCharacteristicProxyAdapter(
-                characteristics[0],
+                characteristics[0], cls=HeartRateService.BodySensorLocation, length=1
-                decode=lambda value: HeartRateService.BodySensorLocation(value[0]),
             )
         else:
             self.body_sensor_location = None
 
         if characteristics := service_proxy.get_characteristics_by_uuid(
-            GATT_HEART_RATE_CONTROL_POINT_CHARACTERISTIC
+            gatt.GATT_HEART_RATE_CONTROL_POINT_CHARACTERISTIC
         ):
-            self.heart_rate_control_point = PackedCharacteristicAdapter(
+            self.heart_rate_control_point = (
-                characteristics[0],
+                gatt_adapters.PackedCharacteristicProxyAdapter(
-                pack_format=HeartRateService.HEART_RATE_CONTROL_POINT_FORMAT,
+                    characteristics[0],
+                    pack_format=HeartRateService.HEART_RATE_CONTROL_POINT_FORMAT,
+                )
             )
         else:
             self.heart_rate_control_point = None
 
-    async def reset_energy_expended(self):
+    async def reset_energy_expended(self) -> None:
         if self.heart_rate_control_point is not None:
             return await self.heart_rate_control_point.write_value(
                 HeartRateService.RESET_ENERGY_EXPENDED

bumble/rfcomm.py

@@ -800,7 +800,7 @@ class Multiplexer(utils.EventEmitter):
 
     def send_frame(self, frame: RFCOMM_Frame) -> None:
         logger.debug(f'>>> Multiplexer sending {frame}')
-        self.l2cap_channel.send_pdu(frame)
+        self.l2cap_channel.write(bytes(frame))
 
     def on_pdu(self, pdu: bytes) -> None:
         frame = RFCOMM_Frame.from_bytes(pdu)

bumble/sdp.py

@@ -847,7 +847,7 @@ class Client:
             self.pending_request = request
 
             try:
-                self.channel.send_pdu(bytes(request))
+                self.channel.write(bytes(request))
                 return await self.pending_response
             finally:
                 self.pending_request = None
@@ -1061,7 +1061,7 @@ class Server:
 
     def send_response(self, response):
         logger.debug(f'{color(">>> Sending SDP Response", "blue")}: {response}')
-        self.channel.send_pdu(response)
+        self.channel.write(response)
 
     def match_services(self, search_pattern: DataElement) -> dict[int, Service]:
         # Find the services for which the attributes in the pattern is a subset of the

bumble/smp.py

@@ -27,7 +27,7 @@ from __future__ import annotations
 import asyncio
 import enum
 import logging
-from collections.abc import Awaitable, Callable
+from collections.abc import Awaitable, Callable, Sequence
 from dataclasses import dataclass, field
 from typing import TYPE_CHECKING, ClassVar, TypeVar, cast
 
@@ -507,10 +507,15 @@ def smp_auth_req(bonding: bool, mitm: bool, sc: bool, keypress: bool, ct2: bool)
 
 # -----------------------------------------------------------------------------
 class AddressResolver:
-    def __init__(self, resolving_keys):
+    def __init__(self, resolving_keys: Sequence[tuple[bytes, Address]]) -> None:
         self.resolving_keys = resolving_keys
 
-    def resolve(self, address):
+    def can_resolve_to(self, address: Address) -> bool:
+        return any(
+            resolved_address == address for _, resolved_address in self.resolving_keys
+        )
+
+    def resolve(self, address: Address) -> Address | None:
         address_bytes = bytes(address)
         hash_part = address_bytes[0:3]
         prand = address_bytes[3:6]

bumble/snoop.py

@@ -110,6 +110,53 @@ class BtSnooper(Snooper):
         )
 
 
+# -----------------------------------------------------------------------------
+class PcapSnooper(Snooper):
+    """
+    Snooper that saves or streames HCI packets using the PCAP format.
+    """
+
+    PCAP_MAGIC = 0xA1B2C3D4
+    DLT_BLUETOOTH_HCI_H4_WITH_PHDR = 201
+
+    def __init__(self, output: BinaryIO):
+        self.output = output
+
+        # Write the header
+        self.output.write(
+            struct.pack(
+                "<IHHIIII",
+                self.PCAP_MAGIC,
+                2,  # Major PCAP Version
+                4,  # Minor PCAP Version
+                0,  # Reserved 1
+                0,  # Reserved 2
+                65535,  # SnapLen
+                # FCS and f are set to 0 implicitly by the next line
+                self.DLT_BLUETOOTH_HCI_H4_WITH_PHDR,  # The DLT in this PCAP
+            )
+        )
+
+    def snoop(self, hci_packet: bytes, direction: Snooper.Direction):
+        now = datetime.datetime.now(datetime.timezone.utc)
+        sec = int(now.timestamp())
+        usec = now.microsecond
+
+        # Emit the record
+        self.output.write(
+            struct.pack(
+                "<IIII",
+                sec,  # Timestamp (Seconds)
+                usec,  # Timestamp (Microseconds)
+                len(hci_packet) + 4,
+                len(hci_packet) + 4,  # +4 because of the addtional direction info...
+            )
+            + struct.pack(">I", int(direction))  # ...thats being added here
+            + hci_packet
+        )
+        self.output.flush()  # flush after every packet for live logging
+
+
 # -----------------------------------------------------------------------------
 _SNOOPER_INSTANCE_COUNT = 0
 
@@ -140,9 +187,38 @@ def create_snooper(spec: str) -> Generator[Snooper, None, None]:
             pid: the current process ID.
             instance: the instance ID in the current process.
 
+      pcapsnoop
+        The syntax for the type-specific arguments for this type is:
+        <io-type>:<io-type-specific-arguments>
+
+        Supported I/O types are:
+
+        file
+          The type-specific arguments for this I/O type is a string that is converted
+          to a file path using the python `str.format()` string formatting. The log
+          records will be written to that file if it can be opened/created.
+          The keyword args that may be referenced by the string pattern are:
+            now: the value of `datetime.now()`
+            utcnow: the value of `datetime.now(tz=datetime.timezone.utc)`
+            pid: the current process ID.
+            instance: the instance ID in the current process.
+
+        pipe
+          The type-specific arguments for this I/O type is a string that is converted
+          to a path using the python `str.format()` string formatting. The log
+          records will be written to the named pipe referenced by this path
+          if it can be opened. The keyword args that may be referenced by the
+          string pattern are:
+            now: the value of `datetime.now()`
+            utcnow: the value of `datetime.now(tz=datetime.timezone.utc)`
+            pid: the current process ID.
+            instance: the instance ID in the current process.
+
     Examples:
       btsnoop:file:my_btsnoop.log
       btsnoop:file:/tmp/bumble_{now:%Y-%m-%d-%H:%M:%S}_{pid}.log
+      pcapsnoop:pipe:/tmp/bumble-extcap
+
 
     """
     if ':' not in spec:
@@ -150,6 +226,8 @@ def create_snooper(spec: str) -> Generator[Snooper, None, None]:
 
     snooper_type, snooper_args = spec.split(':', maxsplit=1)
 
+    global _SNOOPER_INSTANCE_COUNT
+
     if snooper_type == 'btsnoop':
         if ':' not in snooper_args:
             raise core.InvalidArgumentError('I/O type for btsnoop snooper type missing')
@@ -157,7 +235,6 @@ def create_snooper(spec: str) -> Generator[Snooper, None, None]:
         io_type, io_name = snooper_args.split(':', maxsplit=1)
         if io_type == 'file':
             # Process the file name string pattern.
-            global _SNOOPER_INSTANCE_COUNT
             file_path = io_name.format(
                 now=datetime.datetime.now(),
                 utcnow=datetime.datetime.now(tz=datetime.timezone.utc),
@@ -173,6 +250,39 @@ def create_snooper(spec: str) -> Generator[Snooper, None, None]:
                 _SNOOPER_INSTANCE_COUNT -= 1
                 return
 
+    elif snooper_type == 'pcapsnoop':
+        if ':' not in snooper_args:
+            raise core.InvalidArgumentError(
+                'I/O type for pcapsnoop snooper type missing'
+            )
+
+        io_type, io_name = snooper_args.split(':', maxsplit=1)
+        if io_type in {'pipe', 'file'}:
+            # Process the file name string pattern.
+            file_path = io_name.format(
+                now=datetime.datetime.now(),
+                utcnow=datetime.datetime.now(tz=datetime.timezone.utc),
+                pid=os.getpid(),
+                instance=_SNOOPER_INSTANCE_COUNT,
+            )
+
+            # Open a file or pipe
+            logger.debug(f'PCAP file: {file_path}')
+
+            # Pipes we have to open with unbuffered binary I/O
+            # so we pass ``buffering`` for pipes but not for files
+            pcap_file: BinaryIO
+            if io_type == 'pipe':
+                pcap_file = open(file_path, 'wb', buffering=0)
+            else:
+                pcap_file = open(file_path, 'wb')
+
+            with pcap_file:
+                _SNOOPER_INSTANCE_COUNT += 1
+                yield PcapSnooper(pcap_file)
+                _SNOOPER_INSTANCE_COUNT -= 1
+                return
+
         raise core.InvalidArgumentError(f'I/O type {io_type} not supported')
 
     raise core.InvalidArgumentError(f'snooper type {snooper_type} not found')

bumble/transport/android_netsim.py

@@ -194,7 +194,7 @@ async def open_android_netsim_controller_transport(
 
                         # We only accept BLUETOOTH
                         if request.initial_info.chip.kind != ChipKind.BLUETOOTH:
-                            logger.warning('Unsupported chip type')
+                            logger.debug('Request for unsupported chip type')
                             error = PacketResponse(error='Unsupported chip type')
                             await self.context.write(error)
                             # return

bumble/vendor/android/hci.py

@@ -43,44 +43,53 @@ hci.HCI_Command.register_commands(globals())
 
 
 # -----------------------------------------------------------------------------
-@hci.HCI_Command.command
 @dataclasses.dataclass
-class HCI_LE_Get_Vendor_Capabilities_Command(hci.HCI_Command):
+class HCI_LE_Get_Vendor_Capabilities_ReturnParameters(hci.HCI_StatusReturnParameters):
+    max_advt_instances: int = field(metadata=hci.metadata(1), default=0)
+    offloaded_resolution_of_private_address: int = field(
+        metadata=hci.metadata(1), default=0
+    )
+    total_scan_results_storage: int = field(metadata=hci.metadata(2), default=0)
+    max_irk_list_sz: int = field(metadata=hci.metadata(1), default=0)
+    filtering_support: int = field(metadata=hci.metadata(1), default=0)
+    max_filter: int = field(metadata=hci.metadata(1), default=0)
+    activity_energy_info_support: int = field(metadata=hci.metadata(1), default=0)
+    version_supported: int = field(metadata=hci.metadata(2), default=0)
+    total_num_of_advt_tracked: int = field(metadata=hci.metadata(2), default=0)
+    extended_scan_support: int = field(metadata=hci.metadata(1), default=0)
+    debug_logging_supported: int = field(metadata=hci.metadata(1), default=0)
+    le_address_generation_offloading_support: int = field(
+        metadata=hci.metadata(1), default=0
+    )
+    a2dp_source_offload_capability_mask: int = field(
+        metadata=hci.metadata(4), default=0
+    )
+    bluetooth_quality_report_support: int = field(metadata=hci.metadata(1), default=0)
+    dynamic_audio_buffer_support: int = field(metadata=hci.metadata(4), default=0)
+
+
+@hci.HCI_SyncCommand.sync_command(HCI_LE_Get_Vendor_Capabilities_ReturnParameters)
+@dataclasses.dataclass
+class HCI_LE_Get_Vendor_Capabilities_Command(
+    hci.HCI_SyncCommand[HCI_LE_Get_Vendor_Capabilities_ReturnParameters]
+):
     # pylint: disable=line-too-long
     '''
     See https://source.android.com/docs/core/connect/bluetooth/hci_requirements#vendor-specific-capabilities
     '''
 
-    return_parameters_fields = [
-        ('status', hci.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),
-    ]
-
     @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
+        # there are no more bytes to parse, and leave un-signaled parameters set to
-        # None (older versions)
+        # 0
-        nones = {field: None for field, _ in cls.return_parameters_fields}
+        return_parameters = HCI_LE_Get_Vendor_Capabilities_ReturnParameters(
-        return_parameters = hci.HCI_Object(cls.return_parameters_fields, **nones)
+            hci.HCI_ErrorCode.SUCCESS
+        )
 
         try:
             offset = 0
-            for field in cls.return_parameters_fields:
+            for field in cls.return_parameters_class.fields:
                 field_name, field_type = field
                 field_value, field_size = hci.HCI_Object.parse_field(
                     parameters, offset, field_type
@@ -94,9 +103,30 @@ class HCI_LE_Get_Vendor_Capabilities_Command(hci.HCI_Command):
 
 
 # -----------------------------------------------------------------------------
-@hci.HCI_Command.command
+# APCF Subcommands
+class LeApcfOpcode(hci.SpecableEnum):
+    ENABLE = 0x00
+    SET_FILTERING_PARAMETERS = 0x01
+    BROADCASTER_ADDRESS = 0x02
+    SERVICE_UUID = 0x03
+    SERVICE_SOLICITATION_UUID = 0x04
+    LOCAL_NAME = 0x05
+    MANUFACTURER_DATA = 0x06
+    SERVICE_DATA = 0x07
+    TRANSPORT_DISCOVERY_SERVICE = 0x08
+    AD_TYPE_FILTER = 0x09
+    READ_EXTENDED_FEATURES = 0xFF
+
+
 @dataclasses.dataclass
-class HCI_LE_APCF_Command(hci.HCI_Command):
+class HCI_LE_APCF_ReturnParameters(hci.HCI_StatusReturnParameters):
+    opcode: int = field(metadata=LeApcfOpcode.type_metadata(1))
+    payload: bytes = field(metadata=hci.metadata('*'))
+
+
+@hci.HCI_SyncCommand.sync_command(HCI_LE_APCF_ReturnParameters)
+@dataclasses.dataclass
+class HCI_LE_APCF_Command(hci.HCI_SyncCommand[HCI_LE_APCF_ReturnParameters]):
     # pylint: disable=line-too-long
     '''
     See https://source.android.com/docs/core/connect/bluetooth/hci_requirements#le_apcf_command
@@ -105,52 +135,52 @@ class HCI_LE_APCF_Command(hci.HCI_Command):
     implementation. A future enhancement may define subcommand-specific data structures.
     '''
 
-    # APCF Subcommands
+    opcode: int = dataclasses.field(metadata=LeApcfOpcode.type_metadata(1))
-    class Opcode(hci.SpecableEnum):
-        ENABLE = 0x00
-        SET_FILTERING_PARAMETERS = 0x01
-        BROADCASTER_ADDRESS = 0x02
-        SERVICE_UUID = 0x03
-        SERVICE_SOLICITATION_UUID = 0x04
-        LOCAL_NAME = 0x05
-        MANUFACTURER_DATA = 0x06
-        SERVICE_DATA = 0x07
-        TRANSPORT_DISCOVERY_SERVICE = 0x08
-        AD_TYPE_FILTER = 0x09
-        READ_EXTENDED_FEATURES = 0xFF
-
-    opcode: int = dataclasses.field(metadata=Opcode.type_metadata(1))
     payload: bytes = dataclasses.field(metadata=hci.metadata("*"))
 
-    return_parameters_fields = [
-        ('status', hci.STATUS_SPEC),
-        ('opcode', Opcode.type_spec(1)),
-        ('payload', '*'),
-    ]
-
 
 # -----------------------------------------------------------------------------
-@hci.HCI_Command.command
 @dataclasses.dataclass
-class HCI_Get_Controller_Activity_Energy_Info_Command(hci.HCI_Command):
+class HCI_Get_Controller_Activity_Energy_Info_ReturnParameters(
+    hci.HCI_StatusReturnParameters
+):
+    total_tx_time_ms: int = field(metadata=hci.metadata(4))
+    total_rx_time_ms: int = field(metadata=hci.metadata(4))
+    total_idle_time_ms: int = field(metadata=hci.metadata(4))
+    total_energy_used: int = field(metadata=hci.metadata(4))
+
+
+@hci.HCI_SyncCommand.sync_command(
+    HCI_Get_Controller_Activity_Energy_Info_ReturnParameters
+)
+@dataclasses.dataclass
+class HCI_Get_Controller_Activity_Energy_Info_Command(
+    hci.HCI_SyncCommand[HCI_Get_Controller_Activity_Energy_Info_ReturnParameters]
+):
     # pylint: disable=line-too-long
     '''
     See https://source.android.com/docs/core/connect/bluetooth/hci_requirements#le_get_controller_activity_energy_info
     '''
 
-    return_parameters_fields = [
-        ('status', hci.STATUS_SPEC),
-        ('total_tx_time_ms', 4),
-        ('total_rx_time_ms', 4),
-        ('total_idle_time_ms', 4),
-        ('total_energy_used', 4),
-    ]
-
 
 # -----------------------------------------------------------------------------
-@hci.HCI_Command.command
+# A2DP Hardware Offload Subcommands
+class A2dpHardwareOffloadOpcode(hci.SpecableEnum):
+    START_A2DP_OFFLOAD = 0x01
+    STOP_A2DP_OFFLOAD = 0x02
+
+
 @dataclasses.dataclass
-class HCI_A2DP_Hardware_Offload_Command(hci.HCI_Command):
+class HCI_A2DP_Hardware_Offload_ReturnParameters(hci.HCI_StatusReturnParameters):
+    opcode: int = dataclasses.field(metadata=A2dpHardwareOffloadOpcode.type_metadata(1))
+    payload: bytes = dataclasses.field(metadata=hci.metadata("*"))
+
+
+@hci.HCI_SyncCommand.sync_command(HCI_A2DP_Hardware_Offload_ReturnParameters)
+@dataclasses.dataclass
+class HCI_A2DP_Hardware_Offload_Command(
+    hci.HCI_SyncCommand[HCI_A2DP_Hardware_Offload_ReturnParameters]
+):
     # pylint: disable=line-too-long
     '''
     See https://source.android.com/docs/core/connect/bluetooth/hci_requirements#a2dp-hardware-offload-support
@@ -159,25 +189,27 @@ class HCI_A2DP_Hardware_Offload_Command(hci.HCI_Command):
     implementation. A future enhancement may define subcommand-specific data structures.
     '''
 
-    # A2DP Hardware Offload Subcommands
+    opcode: int = dataclasses.field(metadata=A2dpHardwareOffloadOpcode.type_metadata(1))
-    class Opcode(hci.SpecableEnum):
-        START_A2DP_OFFLOAD = 0x01
-        STOP_A2DP_OFFLOAD = 0x02
-
-    opcode: int = dataclasses.field(metadata=Opcode.type_metadata(1))
     payload: bytes = dataclasses.field(metadata=hci.metadata("*"))
 
-    return_parameters_fields = [
-        ('status', hci.STATUS_SPEC),
-        ('opcode', Opcode.type_spec(1)),
-        ('payload', '*'),
-    ]
-
 
 # -----------------------------------------------------------------------------
-@hci.HCI_Command.command
+# Dynamic Audio Buffer Subcommands
+class DynamicAudioBufferOpcode(hci.SpecableEnum):
+    GET_AUDIO_BUFFER_TIME_CAPABILITY = 0x01
+
+
 @dataclasses.dataclass
-class HCI_Dynamic_Audio_Buffer_Command(hci.HCI_Command):
+class HCI_Dynamic_Audio_Buffer_ReturnParameters(hci.HCI_StatusReturnParameters):
+    opcode: int = dataclasses.field(metadata=DynamicAudioBufferOpcode.type_metadata(1))
+    payload: bytes = dataclasses.field(metadata=hci.metadata("*"))
+
+
+@hci.HCI_SyncCommand.sync_command(HCI_Dynamic_Audio_Buffer_ReturnParameters)
+@dataclasses.dataclass
+class HCI_Dynamic_Audio_Buffer_Command(
+    hci.HCI_SyncCommand[HCI_Dynamic_Audio_Buffer_ReturnParameters]
+):
     # pylint: disable=line-too-long
     '''
     See https://source.android.com/docs/core/connect/bluetooth/hci_requirements#dynamic-audio-buffer-command
@@ -186,19 +218,9 @@ class HCI_Dynamic_Audio_Buffer_Command(hci.HCI_Command):
     implementation. A future enhancement may define subcommand-specific data structures.
     '''
 
-    # Dynamic Audio Buffer Subcommands
+    opcode: int = dataclasses.field(metadata=DynamicAudioBufferOpcode.type_metadata(1))
-    class Opcode(hci.SpecableEnum):
-        GET_AUDIO_BUFFER_TIME_CAPABILITY = 0x01
-
-    opcode: int = dataclasses.field(metadata=Opcode.type_metadata(1))
     payload: bytes = dataclasses.field(metadata=hci.metadata("*"))
 
-    return_parameters_fields = [
-        ('status', hci.STATUS_SPEC),
-        ('opcode', Opcode.type_spec(1)),
-        ('payload', '*'),
-    ]
-
 
 # -----------------------------------------------------------------------------
 class HCI_Android_Vendor_Event(hci.HCI_Extended_Event):

bumble/vendor/zephyr/hci.py

@@ -46,9 +46,19 @@ class TX_Power_Level_Command:
 
 
 # -----------------------------------------------------------------------------
-@hci.HCI_Command.command
 @dataclasses.dataclass
-class HCI_Write_Tx_Power_Level_Command(hci.HCI_Command, TX_Power_Level_Command):
+class HCI_Write_Tx_Power_Level_ReturnParameters(hci.HCI_StatusReturnParameters):
+    handle_type: int = hci.field(metadata=hci.metadata(1))
+    connection_handle: int = hci.field(metadata=hci.metadata(2))
+    selected_tx_power_level: int = hci.field(metadata=hci.metadata(-1))
+
+
+@hci.HCI_SyncCommand.sync_command(HCI_Write_Tx_Power_Level_ReturnParameters)
+@dataclasses.dataclass
+class HCI_Write_Tx_Power_Level_Command(
+    hci.HCI_SyncCommand[HCI_Write_Tx_Power_Level_ReturnParameters],
+    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
@@ -61,18 +71,21 @@ class HCI_Write_Tx_Power_Level_Command(hci.HCI_Command, TX_Power_Level_Command):
     connection_handle: int = dataclasses.field(metadata=hci.metadata(2))
     tx_power_level: int = dataclasses.field(metadata=hci.metadata(-1))
 
-    return_parameters_fields = [
-        ('status', hci.STATUS_SPEC),
-        ('handle_type', 1),
-        ('connection_handle', 2),
-        ('selected_tx_power_level', -1),
-    ]
-
 
 # -----------------------------------------------------------------------------
-@hci.HCI_Command.command
 @dataclasses.dataclass
-class HCI_Read_Tx_Power_Level_Command(hci.HCI_Command, TX_Power_Level_Command):
+class HCI_Read_Tx_Power_Level_ReturnParameters(hci.HCI_StatusReturnParameters):
+    handle_type: int = hci.field(metadata=hci.metadata(1))
+    connection_handle: int = hci.field(metadata=hci.metadata(2))
+    tx_power_level: int = hci.field(metadata=hci.metadata(-1))
+
+
+@hci.HCI_SyncCommand.sync_command(HCI_Read_Tx_Power_Level_ReturnParameters)
+@dataclasses.dataclass
+class HCI_Read_Tx_Power_Level_Command(
+    hci.HCI_SyncCommand[HCI_Read_Tx_Power_Level_ReturnParameters],
+    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
@@ -83,10 +96,3 @@ class HCI_Read_Tx_Power_Level_Command(hci.HCI_Command, TX_Power_Level_Command):
 
     handle_type: int = dataclasses.field(metadata=hci.metadata(1))
     connection_handle: int = dataclasses.field(metadata=hci.metadata(2))
-
-    return_parameters_fields = [
-        ('status', hci.STATUS_SPEC),
-        ('handle_type', 1),
-        ('connection_handle', 2),
-        ('tx_power_level', -1),
-    ]

docs/mkdocs/src/platforms/linux.md

@@ -63,7 +63,7 @@ HCI sockets provide a way to send/receive HCI packets to/from a Bluetooth contro
 See the [HCI Socket Transport page](../transports/hci_socket.md) for details on the `hci-socket` tansport syntax.
 
 The HCI device referenced by an `hci-socket` transport (`hci<X>`, where `<X>` is an integer, with `hci0` being the first controller device, and so on) must be in the `DOWN` state before it can be opened as a transport.
-You can bring a HCI controller `UP` or `DOWN` with `hciconfig hci<X> up` and `hciconfig hci<X> up`.
+You can bring a HCI controller `UP` or `DOWN` with `hciconfig hci<X> up` and `hciconfig hci<X> down`.
 
 !!! tip "HCI Socket Permissions"
     By default, when running as a regular user, you won't have the permission to use

docs/mkdocs/src/platforms/zephyr.md

@@ -37,7 +37,7 @@ The vendor specific HCI commands to read and write TX power are defined in
 from bumble.vendor.zephyr.hci import HCI_Write_Tx_Power_Level_Command
 
 # set advertising power to -4 dB
-response = await host.send_command(
+response = await host.send_sync_command(
     HCI_Write_Tx_Power_Level_Command(
         handle_type=HCI_Write_Tx_Power_Level_Command.TX_POWER_HANDLE_TYPE_ADV,
         connection_handle=0,
@@ -45,7 +45,7 @@ response = await host.send_command(
     )
 )
 
-if response.return_parameters.status == HCI_SUCCESS:
+if response.status == HCI_SUCCESS:
-    print(f"TX power set to {response.return_parameters.selected_tx_power_level}")
+    print(f"TX power set to {response.selected_tx_power_level}")
 
 ```

examples/device_information_server.py

@@ -65,7 +65,7 @@ async def main() -> None:
         # Go!
         await device.power_on()
         await device.start_advertising(auto_restart=True)
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/heart_rate_server.py

@@ -71,8 +71,8 @@ async def main() -> None:
                 rr_intervals=random.choice(
                     (
                         (
-                            random.randint(900, 1100) / 1000,
+                            random.randint(900, 1100) // 1000,
-                            random.randint(900, 1100) / 1000,
+                            random.randint(900, 1100) // 1000,
                         ),
                         None,
                     )

examples/run_a2dp_sink.py

@@ -161,7 +161,7 @@ async def main() -> None:
                 await device.set_discoverable(True)
                 await device.set_connectable(True)
 
-            await hci_transport.source.wait_for_termination()
+            await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_a2dp_source.py

@@ -181,7 +181,7 @@ async def main() -> None:
                 await device.set_discoverable(True)
                 await device.set_connectable(True)
 
-            await hci_transport.source.wait_for_termination()
+            await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_advertiser.py

@@ -70,7 +70,7 @@ async def main() -> None:
 
         await device.power_on()
         await device.start_advertising(advertising_type=advertising_type, target=target)
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_avrcp.py

@@ -25,7 +25,7 @@ import sys
 import websockets.asyncio.server
 
 import bumble.logging
-from bumble import a2dp, avc, avdtp, avrcp, utils
+from bumble import a2dp, avc, avdtp, avrcp, sdp, utils
 from bumble.core import PhysicalTransport
 from bumble.device import Device
 from bumble.transport import open_transport
@@ -34,7 +34,7 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
-def sdp_records():
+def sdp_records() -> dict[int, list[sdp.ServiceAttribute]]:
     a2dp_sink_service_record_handle = 0x00010001
     avrcp_controller_service_record_handle = 0x00010002
     avrcp_target_service_record_handle = 0x00010003
@@ -43,17 +43,17 @@ def sdp_records():
         a2dp_sink_service_record_handle: a2dp.make_audio_sink_service_sdp_records(
             a2dp_sink_service_record_handle
         ),
-        avrcp_controller_service_record_handle: avrcp.make_controller_service_sdp_records(
+        avrcp_controller_service_record_handle: avrcp.ControllerServiceSdpRecord(
             avrcp_controller_service_record_handle
-        ),
+        ).to_service_attributes(),
-        avrcp_target_service_record_handle: avrcp.make_target_service_sdp_records(
+        avrcp_target_service_record_handle: avrcp.TargetServiceSdpRecord(
-            avrcp_controller_service_record_handle
+            avrcp_target_service_record_handle
-        ),
+        ).to_service_attributes(),
     }
 
 
 # -----------------------------------------------------------------------------
-def codec_capabilities():
+def codec_capabilities() -> avdtp.MediaCodecCapabilities:
     return avdtp.MediaCodecCapabilities(
         media_type=avdtp.AVDTP_AUDIO_MEDIA_TYPE,
         media_codec_type=a2dp.A2DP_SBC_CODEC_TYPE,
@@ -81,20 +81,22 @@ def codec_capabilities():
 
 
 # -----------------------------------------------------------------------------
-def on_avdtp_connection(server):
+def on_avdtp_connection(server: avdtp.Protocol) -> None:
     # Add a sink endpoint to the server
     sink = server.add_sink(codec_capabilities())
-    sink.on('rtp_packet', on_rtp_packet)
+    sink.on(sink.EVENT_RTP_PACKET, on_rtp_packet)
 
 
 # -----------------------------------------------------------------------------
-def on_rtp_packet(packet):
+def on_rtp_packet(packet: avdtp.MediaPacket) -> None:
     print(f'RTP: {packet}')
 
 
 # -----------------------------------------------------------------------------
-def on_avrcp_start(avrcp_protocol: avrcp.Protocol, websocket_server: WebSocketServer):
+def on_avrcp_start(
-    async def get_supported_events():
+    avrcp_protocol: avrcp.Protocol, websocket_server: WebSocketServer
+) -> None:
+    async def get_supported_events() -> None:
         events = await avrcp_protocol.get_supported_events()
         print("SUPPORTED EVENTS:", events)
         websocket_server.send_message(
@@ -130,14 +132,14 @@ def on_avrcp_start(avrcp_protocol: avrcp.Protocol, websocket_server: WebSocketSe
 
     utils.AsyncRunner.spawn(get_supported_events())
 
-    async def monitor_track_changed():
+    async def monitor_track_changed() -> None:
         async for identifier in avrcp_protocol.monitor_track_changed():
             print("TRACK CHANGED:", identifier.hex())
             websocket_server.send_message(
                 {"type": "track-changed", "params": {"identifier": identifier.hex()}}
             )
 
-    async def monitor_playback_status():
+    async def monitor_playback_status() -> None:
         async for playback_status in avrcp_protocol.monitor_playback_status():
             print("PLAYBACK STATUS CHANGED:", playback_status.name)
             websocket_server.send_message(
@@ -147,7 +149,7 @@ def on_avrcp_start(avrcp_protocol: avrcp.Protocol, websocket_server: WebSocketSe
                 }
             )
 
-    async def monitor_playback_position():
+    async def monitor_playback_position() -> None:
         async for playback_position in avrcp_protocol.monitor_playback_position(
             playback_interval=1
         ):
@@ -159,7 +161,7 @@ def on_avrcp_start(avrcp_protocol: avrcp.Protocol, websocket_server: WebSocketSe
                 }
             )
 
-    async def monitor_player_application_settings():
+    async def monitor_player_application_settings() -> None:
         async for settings in avrcp_protocol.monitor_player_application_settings():
             print("PLAYER APPLICATION SETTINGS:", settings)
             settings_as_dict = [
@@ -173,14 +175,14 @@ def on_avrcp_start(avrcp_protocol: avrcp.Protocol, websocket_server: WebSocketSe
                 }
             )
 
-    async def monitor_available_players():
+    async def monitor_available_players() -> None:
         async for _ in avrcp_protocol.monitor_available_players():
             print("AVAILABLE PLAYERS CHANGED")
             websocket_server.send_message(
                 {"type": "available-players-changed", "params": {}}
             )
 
-    async def monitor_addressed_player():
+    async def monitor_addressed_player() -> None:
         async for player in avrcp_protocol.monitor_addressed_player():
             print("ADDRESSED PLAYER CHANGED")
             websocket_server.send_message(
@@ -195,7 +197,7 @@ def on_avrcp_start(avrcp_protocol: avrcp.Protocol, websocket_server: WebSocketSe
                 }
             )
 
-    async def monitor_uids():
+    async def monitor_uids() -> None:
         async for uid_counter in avrcp_protocol.monitor_uids():
             print("UIDS CHANGED")
             websocket_server.send_message(
@@ -207,7 +209,7 @@ def on_avrcp_start(avrcp_protocol: avrcp.Protocol, websocket_server: WebSocketSe
                 }
             )
 
-    async def monitor_volume():
+    async def monitor_volume() -> None:
         async for volume in avrcp_protocol.monitor_volume():
             print("VOLUME CHANGED:", volume)
             websocket_server.send_message(
@@ -360,7 +362,7 @@ async def main() -> None:
 
         # Create a listener to wait for AVDTP connections
         listener = avdtp.Listener(avdtp.Listener.create_registrar(device))
-        listener.on('connection', on_avdtp_connection)
+        listener.on(listener.EVENT_CONNECTION, on_avdtp_connection)
 
         avrcp_delegate = Delegate()
         avrcp_protocol = avrcp.Protocol(avrcp_delegate)

examples/run_classic_discoverable.py

@@ -112,7 +112,7 @@ async def main() -> None:
         await device.set_discoverable(True)
         await device.set_connectable(True)
 
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_classic_discovery.py

@@ -73,7 +73,7 @@ async def main() -> None:
         await device.power_on()
         await device.start_discovery()
 
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_connect_and_encrypt.py

@@ -57,7 +57,7 @@ async def main() -> None:
             print(f'!!! Encryption failed: {error}')
             return
 
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_connection_updates.py

@@ -0,0 +1,201 @@
+# Copyright 2026 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 asyncio
+import sys
+from collections.abc import Callable
+
+import bumble.logging
+from bumble.core import BaseError
+from bumble.device import Connection, Device
+from bumble.hci import Address, LeFeatureMask
+from bumble.transport import open_transport
+
+# -----------------------------------------------------------------------------
+DEFAULT_CENTRAL_ADDRESS = Address("F0:F0:F0:F0:F0:F0")
+DEFAULT_PERIPHERAL_ADDRESS = Address("F1:F1:F1:F1:F1:F1")
+
+
+# -----------------------------------------------------------------------------
+async def run_as_central(
+    device: Device,
+    scenario: Callable | None,
+) -> None:
+    # Connect to the peripheral
+    print(f'=== Connecting to {DEFAULT_PERIPHERAL_ADDRESS}...')
+    connection = await device.connect(DEFAULT_PERIPHERAL_ADDRESS)
+    print("=== Connected")
+
+    if scenario is not None:
+        await asyncio.sleep(1)
+        await scenario(connection)
+
+    await asyncio.get_running_loop().create_future()
+
+
+async def run_as_peripheral(device: Device, scenario: Callable | None) -> None:
+    # Wait for a connection from the central
+    print(f'=== Advertising as {DEFAULT_PERIPHERAL_ADDRESS}...')
+    await device.start_advertising(auto_restart=True)
+
+    async def on_connection(connection: Connection) -> None:
+        assert scenario is not None
+        await asyncio.sleep(1)
+        await scenario(connection)
+
+    if scenario is not None:
+        device.on(Device.EVENT_CONNECTION, on_connection)
+
+    await asyncio.get_running_loop().create_future()
+
+
+async def change_parameters(
+    connection: Connection,
+    parameter_request_procedure_supported: bool,
+    subrating_supported: bool,
+    shorter_connection_intervals_supported: bool,
+) -> None:
+    if parameter_request_procedure_supported:
+        try:
+            print(">>> update_parameters(7.5, 200, 0, 4000)")
+            await connection.update_parameters(7.5, 200, 0, 4000)
+            await asyncio.sleep(3)
+        except BaseError as error:
+            print(f"Error: {error}")
+
+    if subrating_supported:
+        try:
+            print(">>> update_subrate(1, 2, 2, 1, 4000)")
+            await connection.update_subrate(1, 2, 2, 1, 4000)
+            await asyncio.sleep(3)
+        except BaseError as error:
+            print(f"Error: {error}")
+
+    if shorter_connection_intervals_supported:
+        try:
+            print(
+                ">>> update_parameters_with_subrate(7.5, 200, 1, 1, 0, 0, 4000, 5, 1000)"
+            )
+            await connection.update_parameters_with_subrate(
+                7.5, 200, 1, 1, 0, 0, 4000, 5, 1000
+            )
+            await asyncio.sleep(3)
+        except BaseError as error:
+            print(f"Error: {error}")
+
+        try:
+            print(
+                ">>> update_parameters_with_subrate(0.750, 5, 1, 1, 0, 0, 4000, 0.125, 1000)"
+            )
+            await connection.update_parameters_with_subrate(
+                0.750, 5, 1, 1, 0, 0, 4000, 0.125, 1000
+            )
+            await asyncio.sleep(3)
+        except BaseError as error:
+            print(f"Error: {error}")
+
+    print(">>> done")
+
+
+def on_connection(connection: Connection) -> None:
+    print(f"+++ Connection established: {connection}")
+
+    def on_le_remote_features_change() -> None:
+        print(f'... LE Remote Features change: {connection.peer_le_features.name}')
+
+    connection.on(
+        connection.EVENT_LE_REMOTE_FEATURES_CHANGE, on_le_remote_features_change
+    )
+
+    def on_connection_parameters_change() -> None:
+        print(f'... LE Connection Parameters change: {connection.parameters}')
+
+    connection.on(
+        connection.EVENT_CONNECTION_PARAMETERS_UPDATE, on_connection_parameters_change
+    )
+
+
+async def main() -> None:
+    if len(sys.argv) < 3:
+        print(
+            'Usage: run_connection_updates.py <transport-spec> '
+            'central|peripheral initiator|responder'
+        )
+        return
+
+    print('<<< connecting to HCI...')
+    async with await open_transport(sys.argv[1]) as hci_transport:
+        print('<<< connected')
+
+        role = sys.argv[2]
+        direction = sys.argv[3]
+        device = Device.with_hci(
+            role,
+            (
+                DEFAULT_CENTRAL_ADDRESS
+                if role == "central"
+                else DEFAULT_PERIPHERAL_ADDRESS
+            ),
+            hci_transport.source,
+            hci_transport.sink,
+        )
+        device.le_subrate_enabled = True
+        device.le_shorter_connection_intervals_enabled = True
+        await device.power_on()
+
+        parameter_request_procedure_supported = device.supports_le_features(
+            LeFeatureMask.CONNECTION_PARAMETERS_REQUEST_PROCEDURE
+        )
+        print(
+            "Parameters Request Procedure supported: "
+            f"{parameter_request_procedure_supported}"
+        )
+
+        subrating_supported = device.supports_le_features(
+            LeFeatureMask.CONNECTION_SUBRATING
+        )
+        print(f"Subrating supported: {subrating_supported}")
+
+        shorter_connection_intervals_supported = device.supports_le_features(
+            LeFeatureMask.SHORTER_CONNECTION_INTERVALS
+        )
+        print(
+            "Shorter Connection Intervals supported: "
+            f"{shorter_connection_intervals_supported}"
+        )
+
+        device.on(Device.EVENT_CONNECTION, on_connection)
+
+        async def run(connection: Connection) -> None:
+            await change_parameters(
+                connection,
+                parameter_request_procedure_supported,
+                subrating_supported,
+                shorter_connection_intervals_supported,
+            )
+
+        scenario = run if direction == "initiator" else None
+
+        if role == "central":
+            await run_as_central(device, scenario)
+        else:
+            await run_as_peripheral(device, scenario)
+
+
+# -----------------------------------------------------------------------------
+bumble.logging.setup_basic_logging('DEBUG')
+asyncio.run(main())

examples/run_controller.py

@@ -101,7 +101,7 @@ async def main() -> None:
         await device.start_advertising()
         await device.start_scanning()
 
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_device_with_snooper.py

@@ -48,7 +48,7 @@ async def main() -> None:
             await device.power_on()
             await device.start_scanning()
 
-            await hci_transport.source.wait_for_termination()
+            await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_gatt_server.py

@@ -147,7 +147,7 @@ async def main() -> None:
         else:
             await device.start_advertising(auto_restart=True)
 
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_gatt_server_with_pairing_delegate.py

@@ -99,7 +99,7 @@ async def main() -> None:
         else:
             await device.start_advertising(auto_restart=True)
 
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_gatt_with_adapters.py

@@ -422,7 +422,7 @@ async def main() -> None:
             # Setup a server
             await server(device)
 
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_hfp_gateway.py

@@ -100,13 +100,9 @@ def on_sco_packet(packet: hci.HCI_SynchronousDataPacket):
     if source_file and (pcm_data := source_file.read(packet.data_total_length)):
         assert ag_protocol
         host = ag_protocol.dlc.multiplexer.l2cap_channel.connection.device.host
-        host.send_hci_packet(
+        host.send_sco_sdu(
-            hci.HCI_SynchronousDataPacket(
+            connection_handle=packet.connection_handle,
-                connection_handle=packet.connection_handle,
+            sdu=pcm_data,
-                packet_status=0,
-                data_total_length=len(pcm_data),
-                data=pcm_data,
-            )
         )
 
 

examples/run_hfp_handsfree.py

@@ -167,7 +167,7 @@ async def main() -> None:
 
         await websockets.asyncio.server.serve(serve, 'localhost', 8989)
 
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_hid_device.py

@@ -735,7 +735,7 @@ async def main() -> None:
             print("Executing in Web mode")
             await keyboard_device(hid_device)
 
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_hid_host.py

@@ -556,7 +556,7 @@ async def main() -> None:
             # Interrupt Channel
             await hid_host.connect_interrupt_channel()
 
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_rfcomm_client.py

@@ -227,7 +227,7 @@ async def main() -> None:
             tcp_port = int(sys.argv[5])
             asyncio.create_task(tcp_server(tcp_port, session))
 
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_rfcomm_server.py

@@ -153,7 +153,7 @@ async def main() -> None:
         await device.set_discoverable(True)
         await device.set_connectable(True)
 
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

examples/run_scanner.py

@@ -75,7 +75,7 @@ async def main() -> None:
         await device.power_on()
         await device.start_scanning(filter_duplicates=filter_duplicates)
 
-        await hci_transport.source.wait_for_termination()
+        await hci_transport.source.terminated
 
 
 # -----------------------------------------------------------------------------

pyproject.toml

@@ -15,15 +15,20 @@ dependencies = [
     "aiohttp ~= 3.8; platform_system!='Emscripten'",
     "appdirs >= 1.4; platform_system!='Emscripten'",
     "click >= 8.1.3; platform_system!='Emscripten'",
-    "cryptography >= 44.0.3; platform_system!='Emscripten'",
+    "cryptography >= 44.0.3; platform_system!='Emscripten' and platform_system!='Android'",
     # Pyodide bundles a version of cryptography that is built for wasm, which may not match the
     # versions available on PyPI. Relax the version requirement since it's better than being
     # completely unable to import the package in case of version mismatch.
     "cryptography >= 44.0.3; platform_system=='Emscripten'",
+    # Android wheels for cryptography are not yet available on PyPI, so chaquopy uses
+    # the builds from https://chaquo.com/pypi-13.1/cryptography/. But these are not regually
+    # updated. Relax the version requirement since it's better than being completely unable
+    # to import the package in case of version mismatch.
+    "cryptography >= 42.0.8; platform_system=='Android'",
     "grpcio >= 1.62.1; platform_system!='Emscripten'",
     "humanize >= 4.6.0; platform_system!='Emscripten'",
     "libusb1 >= 2.0.1; platform_system!='Emscripten'",
-    "libusb-package == 1.0.26.1; platform_system!='Emscripten'",
+    "libusb-package == 1.0.26.1; platform_system!='Emscripten' and platform_system!='Android'",
     "platformdirs >= 3.10.0; platform_system!='Emscripten'",
     "prompt_toolkit >= 3.0.16; platform_system!='Emscripten'",
     "prettytable >= 3.6.0; platform_system!='Emscripten'",

rust/pytests/wrapper/drivers.rs

@@ -17,6 +17,6 @@ use pyo3::PyResult;
 
 #[pyo3_asyncio::tokio::test]
 async fn realtek_driver_info_all_drivers() -> PyResult<()> {
-    assert_eq!(12, DriverInfo::all_drivers()?.len());
+    assert_eq!(13, DriverInfo::all_drivers()?.len());
     Ok(())
 }

tests/avrcp_test.py

@@ -17,6 +17,7 @@
 # -----------------------------------------------------------------------------
 from __future__ import annotations
 
+import asyncio
 import struct
 from collections.abc import Sequence
 
@@ -233,7 +234,21 @@ def test_event(event: avrcp.Event):
                     feature_bitmask=avrcp.MediaPlayerItem.Features.ADD_TO_NOW_PLAYING,
                     character_set_id=avrcp.CharacterSetId.UTF_8,
                     displayable_name="Woo",
-                )
+                ),
+                avrcp.FolderItem(
+                    folder_uid=1,
+                    folder_type=avrcp.FolderItem.FolderType.ALBUMS,
+                    is_playable=avrcp.FolderItem.Playable.PLAYABLE,
+                    character_set_id=avrcp.CharacterSetId.UTF_8,
+                    displayable_name="Album",
+                ),
+                avrcp.MediaElementItem(
+                    media_element_uid=1,
+                    media_type=avrcp.MediaElementItem.MediaType.AUDIO,
+                    character_set_id=avrcp.CharacterSetId.UTF_8,
+                    displayable_name="Song",
+                    attribute_value_entry_list=[],
+                ),
             ],
         ),
         avrcp.ChangePathResponse(
@@ -408,6 +423,47 @@ def test_passthrough_commands():
     assert bytes(parsed) == play_pressed_bytes
 
 
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_find_sdp_records():
+    two_devices = await TwoDevices.create_with_avdtp()
+
+    # Add SDP records to device 1
+    controller_record = avrcp.ControllerServiceSdpRecord(
+        service_record_handle=0x10001,
+        avctp_version=(1, 4),
+        avrcp_version=(1, 6),
+        supported_features=(
+            avrcp.ControllerFeatures.CATEGORY_1
+            | avrcp.ControllerFeatures.SUPPORTS_BROWSING
+        ),
+    )
+    target_record = avrcp.TargetServiceSdpRecord(
+        service_record_handle=0x10002,
+        avctp_version=(1, 4),
+        avrcp_version=(1, 6),
+        supported_features=(
+            avrcp.TargetFeatures.CATEGORY_1 | avrcp.TargetFeatures.SUPPORTS_BROWSING
+        ),
+    )
+
+    two_devices.devices[1].sdp_service_records = {
+        0x10001: controller_record.to_service_attributes(),
+        0x10002: target_record.to_service_attributes(),
+    }
+
+    # Find records from device 0
+    controller_records = await avrcp.ControllerServiceSdpRecord.find(
+        two_devices.connections[0]
+    )
+    assert len(controller_records) == 1
+    assert controller_records[0] == controller_record
+
+    target_records = await avrcp.TargetServiceSdpRecord.find(two_devices.connections[0])
+    assert len(target_records) == 1
+    assert target_records[0] == target_record
+
+
 # -----------------------------------------------------------------------------
 @pytest.mark.asyncio
 async def test_get_supported_events():
@@ -422,6 +478,163 @@ async def test_get_supported_events():
     assert supported_events == [avrcp.EventId.VOLUME_CHANGED]
 
 
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_passthrough_key_event():
+    two_devices = await TwoDevices.create_with_avdtp()
+
+    q = asyncio.Queue[tuple[avc.PassThroughFrame.OperationId, bool, bytes]]()
+
+    class Delegate(avrcp.Delegate):
+        async def on_key_event(
+            self, key: avc.PassThroughFrame.OperationId, pressed: bool, data: bytes
+        ) -> None:
+            q.put_nowait((key, pressed, data))
+
+    two_devices.protocols[1].delegate = Delegate()
+
+    for key, pressed in [
+        (avc.PassThroughFrame.OperationId.PLAY, True),
+        (avc.PassThroughFrame.OperationId.PLAY, False),
+        (avc.PassThroughFrame.OperationId.PAUSE, True),
+        (avc.PassThroughFrame.OperationId.PAUSE, False),
+    ]:
+        await two_devices.protocols[0].send_key_event(key, pressed)
+        assert (await q.get()) == (key, pressed, b'')
+
+
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_passthrough_key_event_rejected():
+    two_devices = await TwoDevices.create_with_avdtp()
+
+    class Delegate(avrcp.Delegate):
+        async def on_key_event(
+            self, key: avc.PassThroughFrame.OperationId, pressed: bool, data: bytes
+        ) -> None:
+            raise avrcp.Delegate.AvcError(avc.ResponseFrame.ResponseCode.REJECTED)
+
+    two_devices.protocols[1].delegate = Delegate()
+
+    response = await two_devices.protocols[0].send_key_event(
+        avc.PassThroughFrame.OperationId.PLAY, True
+    )
+    assert response.response == avc.ResponseFrame.ResponseCode.REJECTED
+
+
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_passthrough_key_event_exception():
+    two_devices = await TwoDevices.create_with_avdtp()
+
+    class Delegate(avrcp.Delegate):
+        async def on_key_event(
+            self, key: avc.PassThroughFrame.OperationId, pressed: bool, data: bytes
+        ) -> None:
+            raise Exception()
+
+    two_devices.protocols[1].delegate = Delegate()
+
+    response = await two_devices.protocols[0].send_key_event(
+        avc.PassThroughFrame.OperationId.PLAY, True
+    )
+    assert response.response == avc.ResponseFrame.ResponseCode.REJECTED
+
+
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_set_volume():
+    two_devices = await TwoDevices.create_with_avdtp()
+
+    for volume in range(avrcp.SetAbsoluteVolumeCommand.MAXIMUM_VOLUME + 1):
+        response = await two_devices.protocols[1].send_avrcp_command(
+            avc.CommandFrame.CommandType.CONTROL, avrcp.SetAbsoluteVolumeCommand(volume)
+        )
+        assert isinstance(response.response, avrcp.SetAbsoluteVolumeResponse)
+        assert response.response.volume == volume
+        assert two_devices.protocols[0].delegate.volume == volume
+
+
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_get_playback_status():
+    two_devices = await TwoDevices.create_with_avdtp()
+
+    for status in avrcp.PlayStatus:
+        two_devices.protocols[0].delegate.playback_status = status
+        response = await two_devices.protocols[1].get_play_status()
+        assert response.play_status == status
+
+
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_get_supported_company_ids():
+    two_devices = await TwoDevices.create_with_avdtp()
+
+    for status in avrcp.PlayStatus:
+        two_devices.protocols[0].delegate = avrcp.Delegate(
+            supported_company_ids=[avrcp.AVRCP_BLUETOOTH_SIG_COMPANY_ID]
+        )
+        supported_company_ids = await two_devices.protocols[
+            1
+        ].get_supported_company_ids()
+        assert supported_company_ids == [avrcp.AVRCP_BLUETOOTH_SIG_COMPANY_ID]
+
+
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_monitor_volume():
+    two_devices = await TwoDevices.create_with_avdtp()
+
+    two_devices.protocols[1].delegate = avrcp.Delegate([avrcp.EventId.VOLUME_CHANGED])
+    volume_iter = two_devices.protocols[0].monitor_volume()
+
+    for volume in range(avrcp.SetAbsoluteVolumeCommand.MAXIMUM_VOLUME + 1):
+        # Interim
+        two_devices.protocols[1].delegate.volume = 0
+        assert (await anext(volume_iter)) == 0
+        # Changed
+        two_devices.protocols[1].notify_volume_changed(volume)
+        assert (await anext(volume_iter)) == volume
+
+
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_monitor_playback_status():
+    two_devices = await TwoDevices.create_with_avdtp()
+
+    two_devices.protocols[1].delegate = avrcp.Delegate(
+        [avrcp.EventId.PLAYBACK_STATUS_CHANGED]
+    )
+    playback_status_iter = two_devices.protocols[0].monitor_playback_status()
+
+    for playback_status in avrcp.PlayStatus:
+        # Interim
+        two_devices.protocols[1].delegate.playback_status = avrcp.PlayStatus.STOPPED
+        assert (await anext(playback_status_iter)) == avrcp.PlayStatus.STOPPED
+        # Changed
+        two_devices.protocols[1].notify_playback_status_changed(playback_status)
+        assert (await anext(playback_status_iter)) == playback_status
+
+
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_monitor_now_playing_content():
+    two_devices = await TwoDevices.create_with_avdtp()
+
+    two_devices.protocols[1].delegate = avrcp.Delegate(
+        [avrcp.EventId.NOW_PLAYING_CONTENT_CHANGED]
+    )
+    now_playing_iter = two_devices.protocols[0].monitor_now_playing_content()
+
+    for _ in range(2):
+        # Interim
+        await anext(now_playing_iter)
+        # Changed
+        two_devices.protocols[1].notify_now_playing_content_changed()
+        await anext(now_playing_iter)
+
+
 # -----------------------------------------------------------------------------
 if __name__ == '__main__':
     test_frame_parser()

tests/battery_service_test.py

@@ -0,0 +1,34 @@
+# Copyright 2021-2026 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.
+
+
+import pytest
+
+from bumble import device as device_module
+from bumble.profiles import battery_service
+
+from . import test_utils
+
+
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_read_battery_level():
+    devices = await test_utils.TwoDevices.create_with_connection()
+    service = battery_service.BatteryService(lambda _: 1)
+    devices[0].add_service(service)
+
+    async with device_module.Peer(devices.connections[1]) as peer:
+        client = peer.create_service_proxy(battery_service.BatteryServiceProxy)
+        assert client
+        assert await client.battery_level.read_value() == 1

tests/device_test.py

@@ -42,7 +42,6 @@ from bumble.hci import (
     HCI_CREATE_CONNECTION_COMMAND,
     HCI_SUCCESS,
     Address,
-    HCI_Command_Complete_Event,
     HCI_Command_Status_Event,
     HCI_Connection_Complete_Event,
     HCI_Connection_Request_Event,
@@ -154,10 +153,10 @@ async def test_device_connect_parallel():
         assert packet.name == 'HCI_ACCEPT_CONNECTION_REQUEST_COMMAND'
 
         d1.host.on_hci_packet(
-            HCI_Command_Complete_Event(
+            HCI_Command_Status_Event(
+                status=HCI_COMMAND_STATUS_PENDING,
                 num_hci_command_packets=1,
                 command_opcode=HCI_ACCEPT_CONNECTION_REQUEST_COMMAND,
-                return_parameters=b"\x00",
             )
         )
 
@@ -188,10 +187,10 @@ async def test_device_connect_parallel():
         assert packet.name == 'HCI_ACCEPT_CONNECTION_REQUEST_COMMAND'
 
         d2.host.on_hci_packet(
-            HCI_Command_Complete_Event(
+            HCI_Command_Status_Event(
+                status=HCI_COMMAND_STATUS_PENDING,
                 num_hci_command_packets=1,
                 command_opcode=HCI_ACCEPT_CONNECTION_REQUEST_COMMAND,
-                return_parameters=b"\x00",
             )
         )
 
@@ -620,7 +619,9 @@ async def test_le_request_subrate():
     def on_le_subrate_change():
         q.put_nowait(lambda: None)
 
-    devices.connections[0].on(Connection.EVENT_LE_SUBRATE_CHANGE, on_le_subrate_change)
+    devices.connections[0].on(
+        Connection.EVENT_CONNECTION_PARAMETERS_UPDATE, on_le_subrate_change
+    )
 
     await devices[0].send_command(
         hci.HCI_LE_Subrate_Request_Command(

tests/gatt_test.py

@@ -28,7 +28,7 @@ from unittest.mock import ANY, AsyncMock, Mock
 import pytest
 from typing_extensions import Self
 
-from bumble import gatt_client, l2cap
+from bumble import att, gatt_client, l2cap
 from bumble.att import (
     ATT_ATTRIBUTE_NOT_FOUND_ERROR,
     ATT_PDU,
@@ -1638,6 +1638,104 @@ async def test_eatt_connection_failure():
         await gatt_client.Client.connect_eatt(devices.connections[0])
 
 
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_read_multiple() -> None:
+    devices = await TwoDevices.create_with_connection()
+
+    characteristic1 = Characteristic(
+        '0001', Characteristic.Properties.READ, Characteristic.READABLE, b'1234'
+    )
+
+    characteristic2 = Characteristic(
+        '0002',
+        Characteristic.Properties.READ,
+        Characteristic.READABLE,
+        b'5678',
+    )
+
+    service = Service('0000', [characteristic1, characteristic2])
+    devices[1].add_service(service)
+
+    client = devices.connections[0].gatt_client
+    server = devices[1].gatt_server
+
+    await client.discover_services()
+    characteristics = await client.discover_characteristics(
+        [characteristic1.uuid, characteristic2.uuid], None
+    )
+    response = await client.send_request(
+        att.ATT_Read_Multiple_Request(
+            set_of_handles=[c.handle for c in characteristics]
+        )
+    )
+    assert isinstance(response, att.ATT_Read_Multiple_Response)
+    assert response.set_of_values == b'12345678'
+
+    response = await client.send_request(
+        att.ATT_Read_Multiple_Request(
+            set_of_handles=[
+                next(
+                    handle
+                    for handle in range(0x0001, 0xFFFF)
+                    if not server.get_attribute(handle)
+                )
+            ]
+        )
+    )
+    assert isinstance(response, att.ATT_Error_Response)
+    assert response.error_code == att.ATT_ATTRIBUTE_NOT_FOUND_ERROR
+
+
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_read_multiple_variable() -> None:
+    devices = await TwoDevices.create_with_connection()
+
+    characteristic1 = Characteristic(
+        '0001', Characteristic.Properties.READ, Characteristic.READABLE, b'1234'
+    )
+
+    characteristic2 = Characteristic(
+        '0002',
+        Characteristic.Properties.READ,
+        Characteristic.READABLE,
+        b'99',
+    )
+
+    service = Service('0000', [characteristic1, characteristic2])
+    devices[1].add_service(service)
+
+    client = devices.connections[0].gatt_client
+    server = devices[1].gatt_server
+
+    await client.discover_services()
+    characteristics = await client.discover_characteristics(
+        [characteristic1.uuid, characteristic2.uuid], None
+    )
+    response = await client.send_request(
+        att.ATT_Read_Multiple_Variable_Request(
+            set_of_handles=[c.handle for c in characteristics]
+        )
+    )
+    assert isinstance(response, att.ATT_Read_Multiple_Variable_Response)
+    assert response.length_value_tuple_list == [(4, b'1234'), (2, b'99')]
+
+    response = await client.send_request(
+        att.ATT_Read_Multiple_Variable_Request(
+            set_of_handles=[
+                next(
+                    handle
+                    for handle in range(0x0001, 0xFFFF)
+                    if not server.get_attribute(handle)
+                )
+            ]
+        )
+    )
+    assert isinstance(response, att.ATT_Error_Response)
+    assert response.error_code == att.ATT_ATTRIBUTE_NOT_FOUND_ERROR
+
+
 # -----------------------------------------------------------------------------
 if __name__ == '__main__':
     logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'INFO').upper())

tests/hci_test.py

@@ -20,7 +20,7 @@ import struct
 
 import pytest
 
-from bumble import hci
+from bumble import hci, utils
 
 # -----------------------------------------------------------------------------
 # pylint: disable=invalid-name
@@ -136,43 +136,25 @@ def test_HCI_LE_Channel_Selection_Algorithm_Event():
 # -----------------------------------------------------------------------------
 def test_HCI_Command_Complete_Event():
     # With a serializable object
-    event = hci.HCI_Command_Complete_Event(
+    event1 = hci.HCI_Command_Complete_Event(
         num_hci_command_packets=34,
         command_opcode=hci.HCI_LE_READ_BUFFER_SIZE_COMMAND,
-        return_parameters=hci.HCI_LE_Read_Buffer_Size_Command.create_return_parameters(
+        return_parameters=hci.HCI_LE_Read_Buffer_Size_Command.return_parameters_class(
             status=0,
             le_acl_data_packet_length=1234,
             total_num_le_acl_data_packets=56,
         ),
     )
-    basic_check(event)
+    basic_check(event1)
-
-    # With an arbitrary byte array
-    event = hci.HCI_Command_Complete_Event(
-        num_hci_command_packets=1,
-        command_opcode=hci.HCI_RESET_COMMAND,
-        return_parameters=bytes([1, 2, 3, 4]),
-    )
-    basic_check(event)
-
-    # With a simple status as a 1-byte array
-    event = hci.HCI_Command_Complete_Event(
-        num_hci_command_packets=1,
-        command_opcode=hci.HCI_RESET_COMMAND,
-        return_parameters=bytes([7]),
-    )
-    basic_check(event)
-    event = hci.HCI_Packet.from_bytes(bytes(event))
-    assert event.return_parameters == 7
 
     # With a simple status as an integer status
-    event = hci.HCI_Command_Complete_Event(
+    event3 = hci.HCI_Command_Complete_Event(
         num_hci_command_packets=1,
         command_opcode=hci.HCI_RESET_COMMAND,
-        return_parameters=9,
+        return_parameters=hci.HCI_StatusReturnParameters(hci.HCI_ErrorCode(9)),
     )
-    basic_check(event)
+    basic_check(event3)
-    assert event.return_parameters == 9
+    assert event3.return_parameters.status == 9
 
 
 # -----------------------------------------------------------------------------
@@ -229,6 +211,36 @@ def test_HCI_Vendor_Event():
     assert isinstance(parsed, hci.HCI_Vendor_Event)
 
 
+# -----------------------------------------------------------------------------
+def test_return_parameters() -> None:
+    params = hci.HCI_Reset_Command.parse_return_parameters(bytes.fromhex('3C'))
+    assert params.status == hci.HCI_ErrorCode.ADVERTISING_TIMEOUT_ERROR
+    assert isinstance(params.status, utils.OpenIntEnum)
+
+    params = hci.HCI_Read_BD_ADDR_Command.parse_return_parameters(
+        bytes.fromhex('00001122334455')
+    )
+    assert params.status == hci.HCI_ErrorCode.SUCCESS
+    assert isinstance(params.status, utils.OpenIntEnum)
+    assert isinstance(params.bd_addr, hci.Address)
+
+    params = hci.HCI_Read_Local_Name_Command.parse_return_parameters(
+        bytes.fromhex('0068656c6c6f') + bytes(248 - 5)
+    )
+    assert params.status == hci.HCI_ErrorCode.SUCCESS
+    assert isinstance(params.local_name, bytes)
+    assert len(params.local_name) == 248
+    assert hci.map_null_terminated_utf8_string(params.local_name) == 'hello'
+
+    # Some return parameters may be shorter than the full length
+    # (for Command Complete events with errors)
+    params = hci.HCI_Read_BD_ADDR_Command.parse_return_parameters(
+        bytes.fromhex('010011223344')
+    )
+    assert isinstance(params, hci.HCI_StatusReturnParameters)
+    assert params.status == hci.HCI_ErrorCode.UNKNOWN_HCI_COMMAND_ERROR
+
+
 # -----------------------------------------------------------------------------
 def test_HCI_Command():
     command = hci.HCI_Command(op_code=0x5566)
@@ -291,7 +303,7 @@ def test_custom_le_meta_event():
         for clazz in inspect.getmembers(hci)
         if isinstance(clazz[1], type)
         and issubclass(clazz[1], hci.HCI_Command)
-        and clazz[1] is not hci.HCI_Command
+        and clazz[1] not in (hci.HCI_Command, hci.HCI_SyncCommand, hci.HCI_AsyncCommand)
     ],
 )
 def test_hci_command_subclasses_op_code(clazz: type[hci.HCI_Command]):
@@ -620,21 +632,19 @@ def test_HCI_Read_Local_Supported_Codecs_Command_Complete():
 
 # -----------------------------------------------------------------------------
 def test_HCI_Read_Local_Supported_Codecs_V2_Command_Complete():
-    returned_parameters = (
+    returned_parameters = hci.HCI_Read_Local_Supported_Codecs_V2_Command.parse_return_parameters(
-        hci.HCI_Read_Local_Supported_Codecs_V2_Command.parse_return_parameters(
+        bytes(
-            bytes(
+            [
-                [
+                hci.HCI_SUCCESS,
-                    hci.HCI_SUCCESS,
+                3,
-                    3,
+                hci.CodecID.A_LOG,
-                    hci.CodecID.A_LOG,
+                hci.HCI_Read_Local_Supported_Codecs_V2_ReturnParameters.Transport.BR_EDR_ACL,
-                    hci.HCI_Read_Local_Supported_Codecs_V2_Command.Transport.BR_EDR_ACL,
+                hci.CodecID.CVSD,
-                    hci.CodecID.CVSD,
+                hci.HCI_Read_Local_Supported_Codecs_V2_ReturnParameters.Transport.BR_EDR_SCO,
-                    hci.HCI_Read_Local_Supported_Codecs_V2_Command.Transport.BR_EDR_SCO,
+                hci.CodecID.LINEAR_PCM,
-                    hci.CodecID.LINEAR_PCM,
+                hci.HCI_Read_Local_Supported_Codecs_V2_ReturnParameters.Transport.LE_CIS,
-                    hci.HCI_Read_Local_Supported_Codecs_V2_Command.Transport.LE_CIS,
+                0,
-                    0,
+            ]
-                ]
-            )
         )
     )
     assert returned_parameters.standard_codec_ids == [
@@ -643,9 +653,9 @@ def test_HCI_Read_Local_Supported_Codecs_V2_Command_Complete():
         hci.CodecID.LINEAR_PCM,
     ]
     assert returned_parameters.standard_codec_transports == [
-        hci.HCI_Read_Local_Supported_Codecs_V2_Command.Transport.BR_EDR_ACL,
+        hci.HCI_Read_Local_Supported_Codecs_V2_ReturnParameters.Transport.BR_EDR_ACL,
-        hci.HCI_Read_Local_Supported_Codecs_V2_Command.Transport.BR_EDR_SCO,
+        hci.HCI_Read_Local_Supported_Codecs_V2_ReturnParameters.Transport.BR_EDR_SCO,
-        hci.HCI_Read_Local_Supported_Codecs_V2_Command.Transport.LE_CIS,
+        hci.HCI_Read_Local_Supported_Codecs_V2_ReturnParameters.Transport.LE_CIS,
     ]
 
 
@@ -737,6 +747,7 @@ def run_test_commands():
 if __name__ == '__main__':
     run_test_events()
     run_test_commands()
+    test_return_parameters()
     test_address()
     test_custom()
     test_iso_data_packet()

tests/heart_rate_service_test.py

@@ -0,0 +1,89 @@
+# Copyright 2021-2026 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.
+
+import asyncio
+import itertools
+from collections.abc import Sequence
+
+import pytest
+
+from bumble import device as device_module
+from bumble.profiles import heart_rate_service
+
+from . import test_utils
+
+
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    "heart_rate, sensor_contact_detected, energy_expanded, rr_intervals",
+    itertools.product(
+        (1, 1000), (True, False, None), (2, None), ((3.0, 4.0, 5.0), None)
+    ),
+)
+async def test_read_measurement(
+    heart_rate: int,
+    sensor_contact_detected: bool | None,
+    energy_expanded: int | None,
+    rr_intervals: Sequence[int] | None,
+):
+    devices = await test_utils.TwoDevices.create_with_connection()
+    measurement = heart_rate_service.HeartRateService.HeartRateMeasurement(
+        heart_rate, sensor_contact_detected, energy_expanded, rr_intervals
+    )
+    service = heart_rate_service.HeartRateService(lambda _: measurement)
+    devices[0].add_service(service)
+
+    async with device_module.Peer(devices.connections[1]) as peer:
+        client = peer.create_service_proxy(heart_rate_service.HeartRateServiceProxy)
+        assert client
+        assert await client.heart_rate_measurement.read_value() == measurement
+
+
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_read_body_sensor_location():
+    devices = await test_utils.TwoDevices.create_with_connection()
+    measurement = heart_rate_service.HeartRateService.HeartRateMeasurement(0)
+    location = heart_rate_service.HeartRateService.BodySensorLocation.FINGER
+    service = heart_rate_service.HeartRateService(
+        lambda _: measurement,
+        body_sensor_location=location,
+    )
+    devices[0].add_service(service)
+
+    async with device_module.Peer(devices.connections[1]) as peer:
+        client = peer.create_service_proxy(heart_rate_service.HeartRateServiceProxy)
+        assert client
+        assert client.body_sensor_location
+        assert await client.body_sensor_location.read_value() == location
+
+
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_reset_energy_expended() -> None:
+    devices = await test_utils.TwoDevices.create_with_connection()
+    measurement = heart_rate_service.HeartRateService.HeartRateMeasurement(1)
+    reset_energy_expended = asyncio.Queue[None]()
+    service = heart_rate_service.HeartRateService(
+        lambda _: measurement,
+        reset_energy_expended=lambda _: reset_energy_expended.put_nowait(None),
+    )
+    devices[0].add_service(service)
+
+    async with device_module.Peer(devices.connections[1]) as peer:
+        client = peer.create_service_proxy(heart_rate_service.HeartRateServiceProxy)
+        assert client
+        await client.reset_energy_expended()
+        await reset_energy_expended.get()

tests/host_test.py

@@ -15,6 +15,7 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+import asyncio
 import logging
 import unittest
 import unittest.mock
@@ -22,9 +23,22 @@ import unittest.mock
 import pytest
 
 from bumble.controller import Controller
-from bumble.hci import HCI_AclDataPacket
+from bumble.hci import (
+    HCI_AclDataPacket,
+    HCI_Command_Complete_Event,
+    HCI_Command_Status_Event,
+    HCI_CommandStatus,
+    HCI_Disconnect_Command,
+    HCI_Error,
+    HCI_ErrorCode,
+    HCI_Event,
+    HCI_GenericReturnParameters,
+    HCI_LE_Terminate_BIG_Command,
+    HCI_Reset_Command,
+    HCI_StatusReturnParameters,
+)
 from bumble.host import DataPacketQueue, Host
-from bumble.transport.common import AsyncPipeSink
+from bumble.transport.common import AsyncPipeSink, TransportSink
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -151,3 +165,114 @@ def test_data_packet_queue():
     assert drain_listener.on_flow.call_count == 1
     assert queue.queued == 15
     assert queue.completed == 15
+
+
+# -----------------------------------------------------------------------------
+class Source:
+    terminated: asyncio.Future[None]
+    sink: TransportSink
+
+    def set_packet_sink(self, sink: TransportSink) -> None:
+        self.sink = sink
+
+
+class Sink:
+    response: HCI_Event
+
+    def __init__(self, source: Source, response: HCI_Event) -> None:
+        self.source = source
+        self.response = response
+
+    def on_packet(self, packet: bytes) -> None:
+        self.source.sink.on_packet(bytes(self.response))
+
+
+@pytest.mark.asyncio
+async def test_send_sync_command() -> None:
+    source = Source()
+    sink = Sink(
+        source,
+        HCI_Command_Complete_Event(
+            1,
+            HCI_Reset_Command.op_code,
+            HCI_StatusReturnParameters(status=HCI_ErrorCode.SUCCESS),
+        ),
+    )
+
+    host = Host(source, sink)
+    host.ready = True
+
+    # Sync command with success
+    response1 = await host.send_sync_command(HCI_Reset_Command())
+    assert response1.status == HCI_ErrorCode.SUCCESS
+
+    # Sync command with error status should raise
+    error_response = HCI_Command_Complete_Event(
+        1,
+        HCI_Reset_Command.op_code,
+        HCI_StatusReturnParameters(status=HCI_ErrorCode.COMMAND_DISALLOWED_ERROR),
+    )
+    sink.response = error_response
+    with pytest.raises(HCI_Error) as excinfo:
+        await host.send_sync_command(HCI_Reset_Command())
+
+    assert excinfo.value.error_code == error_response.return_parameters.status
+
+    # Sync command with raw result
+    response2 = await host.send_sync_command_raw(HCI_Reset_Command())
+    assert response2.return_parameters.status == HCI_ErrorCode.COMMAND_DISALLOWED_ERROR
+
+    # Sync command with a command that's not an HCI_SyncCommand
+    # (here, for convenience, we use an HCI_AsyncCommand instance)
+    command = HCI_Disconnect_Command(connection_handle=0x1234, reason=0x13)
+    sink.response = HCI_Command_Complete_Event(
+        1,
+        command.op_code,
+        HCI_GenericReturnParameters(data=bytes.fromhex("00112233")),
+    )
+    response3 = await host.send_sync_command_raw(command)  # type: ignore
+    assert isinstance(response3.return_parameters, HCI_GenericReturnParameters)
+
+
+@pytest.mark.asyncio
+async def test_send_async_command() -> None:
+    source = Source()
+    sink = Sink(
+        source,
+        HCI_Command_Status_Event(
+            HCI_CommandStatus.PENDING,
+            1,
+            HCI_Reset_Command.op_code,
+        ),
+    )
+
+    host = Host(source, sink)
+    host.ready = True
+
+    # Normal pending status
+    response = await host.send_async_command(
+        HCI_LE_Terminate_BIG_Command(big_handle=0, reason=0)
+    )
+    assert response == HCI_CommandStatus.PENDING
+
+    # Unknown HCI command result returned as a Command Status
+    sink.response = HCI_Command_Status_Event(
+        HCI_ErrorCode.UNKNOWN_HCI_COMMAND_ERROR,
+        1,
+        HCI_LE_Terminate_BIG_Command.op_code,
+    )
+    response = await host.send_async_command(
+        HCI_LE_Terminate_BIG_Command(big_handle=0, reason=0), check_status=False
+    )
+    assert response == HCI_ErrorCode.UNKNOWN_HCI_COMMAND_ERROR
+
+    # Unknown HCI command result returned as a Command Complete
+    sink.response = HCI_Command_Complete_Event(
+        1,
+        HCI_LE_Terminate_BIG_Command.op_code,
+        HCI_StatusReturnParameters(HCI_ErrorCode.UNKNOWN_HCI_COMMAND_ERROR),
+    )
+    response = await host.send_async_command(
+        HCI_LE_Terminate_BIG_Command(big_handle=0, reason=0), check_status=False
+    )
+    assert response == HCI_ErrorCode.UNKNOWN_HCI_COMMAND_ERROR

tests/l2cap_test.py

@@ -239,20 +239,7 @@ async def transfer_payload(
     channels[1].sink = received.put_nowait
     sdu_lengths = (21, 70, 700, 5523)
 
-    if isinstance(channels[1], l2cap.LeCreditBasedChannel):
+    messages = [bytes([i % 8 for i in range(sdu_length)]) for sdu_length in sdu_lengths]
-        mps = channels[1].mps
-    elif isinstance(
-        processor := channels[1].processor, l2cap.EnhancedRetransmissionProcessor
-    ):
-        mps = processor.mps
-    else:
-        mps = channels[1].mtu
-
-    messages = [
-        bytes([i % 8 for i in range(sdu_length)])
-        for sdu_length in sdu_lengths
-        if sdu_length <= mps
-    ]
     for message in messages:
         channels[0].write(message)
         if isinstance(channels[0], l2cap.LeCreditBasedChannel):
@@ -334,20 +321,26 @@ async def test_mtu():
 
 # -----------------------------------------------------------------------------
 @pytest.mark.asyncio
-async def test_enhanced_retransmission_mode():
+@pytest.mark.parametrize("mtu,", (50, 255, 256, 1000))
+async def test_enhanced_retransmission_mode(mtu: int):
     devices = TwoDevices()
     await devices.setup_connection()
 
     server_channels = asyncio.Queue[l2cap.ClassicChannel]()
     server = devices.devices[1].create_l2cap_server(
         spec=l2cap.ClassicChannelSpec(
-            mode=l2cap.TransmissionMode.ENHANCED_RETRANSMISSION
+            mode=l2cap.TransmissionMode.ENHANCED_RETRANSMISSION,
+            mtu=mtu,
+            mps=256,
         ),
         handler=server_channels.put_nowait,
     )
     client_channel = await devices.connections[0].create_l2cap_channel(
         spec=l2cap.ClassicChannelSpec(
-            server.psm, mode=l2cap.TransmissionMode.ENHANCED_RETRANSMISSION
+            server.psm,
+            mode=l2cap.TransmissionMode.ENHANCED_RETRANSMISSION,
+            mtu=mtu,
+            mps=1024,
         )
     )
     server_channel = await server_channels.get()

web/heart_rate_monitor/heart_rate_monitor.py

@@ -89,7 +89,7 @@ class HeartRateMonitor:
 
     async def stop(self):
         # TODO: replace this once a proper reset is implemented in the lib.
-        await self.device.host.send_command(HCI_Reset_Command())
+        await self.device.host.send_sync_command(HCI_Reset_Command())
         await self.device.power_off()
         print('### Monitor stopped')
 

web/scanner/scanner.py

@@ -60,7 +60,7 @@ class Scanner(utils.EventEmitter):
 
     async def stop(self):
         # TODO: replace this once a proper reset is implemented in the lib.
-        await self.device.host.send_command(HCI_Reset_Command())
+        await self.device.host.send_sync_command(HCI_Reset_Command())
         await self.device.power_off()
         print('### Scanner stopped')
 

web/speaker/speaker.py

@@ -311,7 +311,7 @@ class Speaker:
 
     async def stop(self):
         # TODO: replace this once a proper reset is implemented in the lib.
-        await self.device.host.send_command(HCI_Reset_Command())
+        await self.device.host.send_sync_command(HCI_Reset_Command())
         await self.device.power_off()
         print('Speaker stopped')