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# Copyright 2022 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.
"""Generic & dependency free Bumble (reference) device."""
from __future__ import annotations
from typing import Any
from bumble import transport
from bumble.core import (
BT_GENERIC_AUDIO_SERVICE,
BT_HANDSFREE_SERVICE,
BT_L2CAP_PROTOCOL_ID,
BT_RFCOMM_PROTOCOL_ID,
)
from bumble.device import Device, DeviceConfiguration
from bumble.host import Host
from bumble.sdp import (
SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID,
SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
DataElement,
ServiceAttribute,
)
# Default rootcanal HCI TCP address
ROOTCANAL_HCI_ADDRESS = "localhost:6402"
class PandoraDevice:
"""
Small wrapper around a Bumble device and it's HCI transport.
Notes:
- The Bumble device is idle by default.
- Repetitive calls to `open`/`close` will result on new Bumble device instances.
"""
# Bumble device instance & configuration.
device: Device
config: dict[str, Any]
# HCI transport name & instance.
_hci_name: str
_hci: transport.Transport | None # type: ignore[name-defined]
def __init__(self, config: dict[str, Any]) -> None:
self.config = config
self.device = _make_device(config)
self._hci_name = config.get(
'transport', f"tcp-client:{config.get('tcp', ROOTCANAL_HCI_ADDRESS)}"
)
self._hci = None
@property
def idle(self) -> bool:
return self._hci is None
async def open(self) -> None:
if self._hci is not None:
return
# open HCI transport & set device host.
self._hci = await transport.open_transport(self._hci_name)
self.device.host = Host(
controller_source=self._hci.source, controller_sink=self._hci.sink
) # type: ignore[no-untyped-call]
# power-on.
await self.device.power_on()
async def close(self) -> None:
if self._hci is None:
return
# flush & re-initialize device.
await self.device.host.flush()
self.device.host = None # type: ignore[assignment]
self.device = _make_device(self.config)
# close HCI transport.
await self._hci.close()
self._hci = None
async def reset(self) -> None:
await self.close()
await self.open()
def info(self) -> dict[str, str] | None:
return {
'public_bd_address': str(self.device.public_address),
'random_address': str(self.device.random_address),
}
def _make_device(config: dict[str, Any]) -> Device:
"""Initialize an idle Bumble device instance."""
# initialize bumble device.
device_config = DeviceConfiguration()
device_config.load_from_dict(config)
device = Device(config=device_config, host=None)
# Add fake a2dp service to avoid Android disconnect
device.sdp_service_records = _make_sdp_records(1)
return device
# TODO(b/267540823): remove when Pandora A2dp is supported
def _make_sdp_records(rfcomm_channel: int) -> dict[int, list[ServiceAttribute]]:
return {
0x00010001: [
ServiceAttribute(
SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
DataElement.unsigned_integer_32(0x00010001),
),
ServiceAttribute(
SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID,
DataElement.sequence(
[
DataElement.uuid(BT_HANDSFREE_SERVICE),
DataElement.uuid(BT_GENERIC_AUDIO_SERVICE),
]
),
),
ServiceAttribute(
SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
DataElement.sequence(
[
DataElement.sequence([DataElement.uuid(BT_L2CAP_PROTOCOL_ID)]),
DataElement.sequence(
[
DataElement.uuid(BT_RFCOMM_PROTOCOL_ID),
DataElement.unsigned_integer_8(rfcomm_channel),
]
),
]
),
),
ServiceAttribute(
SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
DataElement.sequence(
[
DataElement.sequence(
[
DataElement.uuid(BT_HANDSFREE_SERVICE),
DataElement.unsigned_integer_16(0x0105),
]
)
]
),
),
]
}
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