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# Copyright 2021-2022 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.
from __future__ import annotations
import asyncio
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
import logging
from typing import TYPE_CHECKING
from bumble import core, hci, ll, lmp
if TYPE_CHECKING:
from bumble import controller
# -----------------------------------------------------------------------------
# Logging
# -----------------------------------------------------------------------------
logger = logging.getLogger(__name__)
# -----------------------------------------------------------------------------
# TODO: add more support for various LL exchanges
# (see Vol 6, Part B - 2.4 DATA CHANNEL PDU)
# -----------------------------------------------------------------------------
class LocalLink:
'''
Link bus for controllers to communicate with each other
'''
controllers: set[controller.Controller]
def __init__(self):
self.controllers = set()
self.pending_classic_connection = None
############################################################
# Common utils
############################################################
def add_controller(self, controller: controller.Controller):
logger.debug(f'new controller: {controller}')
self.controllers.add(controller)
def remove_controller(self, controller: controller.Controller):
self.controllers.remove(controller)
def find_le_controller(self, address: hci.Address) -> controller.Controller | None:
for controller in self.controllers:
for connection in controller.le_connections.values():
if connection.self_address == address:
return controller
return None
def find_classic_controller(
self, address: hci.Address
) -> controller.Controller | None:
for controller in self.controllers:
if controller.public_address == address:
return controller
return None
############################################################
# LE handlers
############################################################
def on_address_changed(self, controller):
pass
def send_acl_data(
self,
sender_controller: controller.Controller,
destination_address: hci.Address,
transport: core.PhysicalTransport,
data: bytes,
):
# Send the data to the first controller with a matching address
if transport == core.PhysicalTransport.LE:
destination_controller = self.find_le_controller(destination_address)
source_address = sender_controller.random_address
elif transport == core.PhysicalTransport.BR_EDR:
destination_controller = self.find_classic_controller(destination_address)
source_address = sender_controller.public_address
else:
raise ValueError("unsupported transport type")
if destination_controller is not None:
asyncio.get_running_loop().call_soon(
lambda: destination_controller.on_link_acl_data(
source_address, transport, data
)
)
def send_advertising_pdu(
self,
sender_controller: controller.Controller,
packet: ll.AdvertisingPdu,
):
loop = asyncio.get_running_loop()
for c in self.controllers:
if c != sender_controller:
loop.call_soon(c.on_ll_advertising_pdu, packet)
def send_ll_control_pdu(
self,
sender_address: hci.Address,
receiver_address: hci.Address,
packet: ll.ControlPdu,
):
if not (receiver_controller := self.find_le_controller(receiver_address)):
raise core.InvalidArgumentError(
f"Unable to find controller for address {receiver_address}"
)
asyncio.get_running_loop().call_soon(
lambda: receiver_controller.on_ll_control_pdu(sender_address, packet)
)
############################################################
# Classic handlers
############################################################
def send_lmp_packet(
self,
sender_controller: controller.Controller,
receiver_address: hci.Address,
packet: lmp.Packet,
):
if not (receiver_controller := self.find_classic_controller(receiver_address)):
raise core.InvalidArgumentError(
f"Unable to find controller for address {receiver_address}"
)
asyncio.get_running_loop().call_soon(
lambda: receiver_controller.on_lmp_packet(
sender_controller.public_address, packet
)
)
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