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# Copyright 2024 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
from __future__ import annotations
import asyncio
import functools
import sys
import bumble.logging
from bumble import core, hci
from bumble.device import ChannelSoundingCapabilities, Connection, Device
from bumble.transport import open_transport
# From https://cs.android.com/android/platform/superproject/main/+/main:packages/modules/Bluetooth/system/gd/hci/distance_measurement_manager.cc.
CS_TONE_ANTENNA_CONFIG_MAPPING_TABLE = [
[0, 4, 5, 6],
[1, 7, 7, 7],
[2, 7, 7, 7],
[3, 7, 7, 7],
]
CS_PREFERRED_PEER_ANTENNA_MAPPING_TABLE = [1, 1, 1, 1, 3, 7, 15, 3]
CS_ANTENNA_PERMUTATION_ARRAY = [
[1, 2, 3, 4],
[2, 1, 3, 4],
[1, 3, 2, 4],
[3, 1, 2, 4],
[3, 2, 1, 4],
[2, 3, 1, 4],
[1, 2, 4, 3],
[2, 1, 4, 3],
[1, 4, 2, 3],
[4, 1, 2, 3],
[4, 2, 1, 3],
[2, 4, 1, 3],
[1, 4, 3, 2],
[4, 1, 3, 2],
[1, 3, 4, 2],
[3, 1, 4, 2],
[3, 4, 1, 2],
[4, 3, 1, 2],
[4, 2, 3, 1],
[2, 4, 3, 1],
[4, 3, 2, 1],
[3, 4, 2, 1],
[3, 2, 4, 1],
[2, 3, 4, 1],
]
# -----------------------------------------------------------------------------
async def main() -> None:
if len(sys.argv) < 3:
print(
'Usage: run_channel_sounding.py <config-file> <transport-spec-for-device>'
'[target_address](If missing, run as reflector)'
)
print('example: run_channel_sounding.py cs_reflector.json usb:0')
print(
'example: run_channel_sounding.py cs_initiator.json usb:0 F0:F1:F2:F3:F4:F5'
)
return
print('<<< connecting to HCI...')
async with await open_transport(sys.argv[2]) as hci_transport:
print('<<< connected')
device = Device.from_config_file_with_hci(
sys.argv[1], hci_transport.source, hci_transport.sink
)
await device.power_on()
assert (local_cs_capabilities := device.cs_capabilities)
if len(sys.argv) == 3:
print('<<< Start Advertising')
await device.start_advertising(
own_address_type=hci.OwnAddressType.RANDOM, auto_restart=True
)
def on_cs_capabilities(
connection: Connection, capabilities: ChannelSoundingCapabilities
):
del capabilities
print('<<< Set CS Settings')
asyncio.create_task(device.set_default_cs_settings(connection))
device.on(
'connection',
lambda connection: connection.on(
'channel_sounding_capabilities',
functools.partial(on_cs_capabilities, connection),
),
)
else:
target_address = hci.Address(sys.argv[3])
print(f'<<< Connecting to {target_address}')
connection = await device.connect(
target_address, transport=core.PhysicalTransport.LE
)
print('<<< ACL Connected')
if not (await device.get_long_term_key(connection.handle, b'', 0)):
print('<<< No bond, start pairing')
await connection.pair()
print('<<< Pairing complete')
print('<<< Encrypting Connection')
await connection.encrypt()
print('<<< Getting remote CS Capabilities...')
remote_capabilities = await device.get_remote_cs_capabilities(connection)
print('<<< Set CS Settings...')
await device.set_default_cs_settings(connection)
print('<<< Set CS Config...')
config = await device.create_cs_config(connection)
print('<<< Enable CS Security...')
await device.enable_cs_security(connection)
tone_antenna_config_selection = CS_TONE_ANTENNA_CONFIG_MAPPING_TABLE[
local_cs_capabilities.num_antennas_supported - 1
][remote_capabilities.num_antennas_supported - 1]
print('<<< Set CS Procedure Parameters...')
await device.set_cs_procedure_parameters(
connection=connection,
config=config,
tone_antenna_config_selection=tone_antenna_config_selection,
preferred_peer_antenna=CS_PREFERRED_PEER_ANTENNA_MAPPING_TABLE[
tone_antenna_config_selection
],
)
print('<<< Enable CS Procedure...')
await device.enable_cs_procedure(connection=connection, config=config)
await hci_transport.source.terminated
# -----------------------------------------------------------------------------
bumble.logging.setup_basic_logging('DEBUG')
asyncio.run(main())
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