Added support for Google´s Bumble Bluetooth Controller stack

The backend supports direct use with Bumble. The HCI Controller
is managed by the Bumble stack and the transport layer can
be defined by the user (e.g. VHCI, Serial, TCP, android-netsim).

Author: vChavezB

AUTHORS.rst

@@ -24,6 +24,7 @@ Contributors
 * David Johansen <davejohansen@gmail.com>
 * JP Hutchins <jphutchins@gmail.com>
 * Bram Duvigneau <bram@bramd.nl>
+* Victor Chavez <vchavezb@protonmail.com>
 
 Sponsors
 --------

CHANGELOG.rst

@@ -9,6 +9,10 @@ and this project adheres to `Semantic Versioning <https://semver.org/spec/v2.0.0
 
 `Unreleased`_
 =============
+Added
+-----
+* Added support for Google's Bumble Bluetooth stack.
+
 
 `0.22.3`_ (2024-10-05)
 ======================

bleak/backends/bumble/__init__.py

@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2024 Victor Chavez
+"""Bumble backend."""
+
+from bumble.controller import Controller
+from bumble.link import LocalLink
+from bumble.transport import open_transport
+
+transports = {}
+link = LocalLink()
+
+
+def get_default_transport():
+    return "tcp-server:_:1234"
+
+
+async def start_transport(transport: str):
+    if transport not in transports.keys():
+        transports[transport] = await open_transport(transport)
+        Controller(
+            "ext",
+            host_source=transports[transport].source,
+            host_sink=transports[transport].sink,
+            link=link,
+        )
+
+    return transports[transport]
+
+
+def get_link():
+    # Assume all transports are linked
+    return link

bleak/backends/bumble/characteristic.py

@@ -0,0 +1,80 @@
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2024 Victor Chavez
+
+from typing import Callable, List, Union
+from uuid import UUID
+
+from bumble.gatt_client import CharacteristicProxy, ServiceProxy
+
+from ... import normalize_uuid_str
+from ..characteristic import BleakGATTCharacteristic
+from ..descriptor import BleakGATTDescriptor
+from .utils import uuid_bytes_to_str
+
+
+class BleakGATTCharacteristicBumble(BleakGATTCharacteristic):
+    """GATT Characteristic implementation for the Bumble backend."""
+
+    def __init__(
+        self,
+        obj: CharacteristicProxy,
+        max_write_without_response_size: Callable[[], int],
+        svc: ServiceProxy,
+    ):
+        super().__init__(obj, max_write_without_response_size)
+        self.__descriptors = []
+        self.__props = [str(prop) for prop in obj.properties]
+        self.__svc = svc
+        uuid = uuid_bytes_to_str(obj.uuid.uuid_bytes)
+        self.__uuid = normalize_uuid_str(uuid)
+
+    @property
+    def service_uuid(self) -> str:
+        """The uuid of the Service containing this characteristic"""
+        return self.__svc.uuid
+
+    @property
+    def service_handle(self) -> int:
+        """The integer handle of the Service containing this characteristic"""
+        return self.__svc.handle
+
+    @property
+    def handle(self) -> int:
+        """The handle of this characteristic"""
+        return int(self.obj.handle)
+
+    @property
+    def uuid(self) -> str:
+        """The uuid of this characteristic"""
+        return self.__uuid
+
+    @property
+    def properties(self) -> List[str]:
+        """Properties of this characteristic"""
+        return self.__props
+
+    @property
+    def descriptors(self) -> List[BleakGATTDescriptor]:
+        """List of descriptors for this characteristic"""
+        return self.__descriptors
+
+    def get_descriptor(
+        self, specifier: Union[int, str, UUID]
+    ) -> Union[BleakGATTDescriptor, None]:
+        """Get a descriptor by handle (int) or UUID (str or uuid.UUID)"""
+        try:
+            if isinstance(specifier, int):
+                return next(filter(lambda x: x.handle == specifier, self.descriptors))
+            else:
+                return next(
+                    filter(lambda x: x.uuid == str(specifier), self.descriptors)
+                )
+        except StopIteration:
+            return None
+
+    def add_descriptor(self, descriptor: BleakGATTDescriptor):
+        """Add a :py:class:`~BleakGATTDescriptor` to the characteristic.
+
+        Should not be used by end user, but rather by `bleak` itself.
+        """
+        self.__descriptors.append(descriptor)