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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.
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
import asyncio
import sys
import bumble.logging
from bumble.device import Device
from bumble.gatt import Characteristic, Service
from bumble.pairing import PairingConfig, PairingDelegate
from bumble.transport import open_transport
# -----------------------------------------------------------------------------
class FixedPinPairingDelegate(PairingDelegate):
"""
A PairingDelegate that declares that the device only has the ability to display
a passkey but not to enter or confirm one. When asked for the passkey to use for
pairing, this delegate returns a fixed value (instead of the default, which is
to generate a random value each time). This is obviously not a secure way to do
pairing, but it used here as an illustration of how a delegate can override the
default passkey generation.
"""
def __init__(self, passkey: int) -> None:
super().__init__(io_capability=PairingDelegate.IoCapability.DISPLAY_OUTPUT_ONLY)
self.passkey = passkey
async def generate_passkey(self) -> int:
return self.passkey
# -----------------------------------------------------------------------------
async def main() -> None:
if len(sys.argv) < 3:
print(
'Usage: run_gatt_server_with_pairing_delegate.py <device-config> <transport-spec> '
)
print('example: run_gatt_server_with_pairing_delegate.py device1.json usb:0')
return
print('<<< connecting to HCI...')
async with await open_transport(sys.argv[2]) as hci_transport:
print('<<< connected')
# Create a device to manage the host
device = Device.from_config_file_with_hci(
sys.argv[1], hci_transport.source, hci_transport.sink
)
# Add a service with a single characteristic.
# The characteristic requires authentication, so reading it on a non-paired
# connection will return an error.
custom_service1 = Service(
'50DB505C-8AC4-4738-8448-3B1D9CC09CC5',
[
Characteristic(
'486F64C6-4B5F-4B3B-8AFF-EDE134A8446A',
Characteristic.Properties.READ,
Characteristic.READABLE
| Characteristic.READ_REQUIRES_AUTHENTICATION,
bytes('hello', 'utf-8'),
),
],
)
device.add_services([custom_service1])
# Debug print
for attribute in device.gatt_server.attributes:
print(attribute)
# Setup pairing
device.pairing_config_factory = lambda connection: PairingConfig(
delegate=FixedPinPairingDelegate(123456)
)
# Get things going
await device.power_on()
# Connect to a peer
if len(sys.argv) > 3:
target_address = sys.argv[3]
print(f'=== Connecting to {target_address}...')
await device.connect(target_address)
else:
await device.start_advertising(auto_restart=True)
await hci_transport.source.wait_for_termination()
# -----------------------------------------------------------------------------
bumble.logging.setup_basic_logging('DEBUG')
asyncio.run(main())
|
