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108 lines
3.9 KiB
Python
108 lines
3.9 KiB
Python
# Copyright 2021-2022 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# -----------------------------------------------------------------------------
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# Imports
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# -----------------------------------------------------------------------------
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import asyncio
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import sys
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import bumble.logging
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from bumble.device import Device
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from bumble.gatt import Characteristic, Service
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from bumble.pairing import PairingConfig, PairingDelegate
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from bumble.transport import open_transport
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# -----------------------------------------------------------------------------
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class FixedPinPairingDelegate(PairingDelegate):
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"""
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A PairingDelegate that declares that the device only has the ability to display
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a passkey but not to enter or confirm one. When asked for the passkey to use for
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pairing, this delegate returns a fixed value (instead of the default, which is
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to generate a random value each time). This is obviously not a secure way to do
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pairing, but it used here as an illustration of how a delegate can override the
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default passkey generation.
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"""
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def __init__(self, passkey: int) -> None:
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super().__init__(io_capability=PairingDelegate.IoCapability.DISPLAY_OUTPUT_ONLY)
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self.passkey = passkey
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async def generate_passkey(self) -> int:
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return self.passkey
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# -----------------------------------------------------------------------------
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async def main() -> None:
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if len(sys.argv) < 3:
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print(
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'Usage: run_gatt_server_with_pairing_delegate.py <device-config> <transport-spec> '
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)
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print('example: run_gatt_server_with_pairing_delegate.py device1.json usb:0')
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return
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print('<<< connecting to HCI...')
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async with await open_transport(sys.argv[2]) as hci_transport:
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print('<<< connected')
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# Create a device to manage the host
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device = Device.from_config_file_with_hci(
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sys.argv[1], hci_transport.source, hci_transport.sink
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)
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# Add a service with a single characteristic.
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# The characteristic requires authentication, so reading it on a non-paired
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# connection will return an error.
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custom_service1 = Service(
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'50DB505C-8AC4-4738-8448-3B1D9CC09CC5',
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[
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Characteristic(
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'486F64C6-4B5F-4B3B-8AFF-EDE134A8446A',
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Characteristic.Properties.READ,
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Characteristic.READABLE
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| Characteristic.READ_REQUIRES_AUTHENTICATION,
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bytes('hello', 'utf-8'),
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),
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],
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)
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device.add_services([custom_service1])
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# Debug print
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for attribute in device.gatt_server.attributes:
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print(attribute)
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# Setup pairing
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device.pairing_config_factory = lambda connection: PairingConfig(
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delegate=FixedPinPairingDelegate(123456)
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)
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# Get things going
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await device.power_on()
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# Connect to a peer
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if len(sys.argv) > 3:
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target_address = sys.argv[3]
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print(f'=== Connecting to {target_address}...')
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await device.connect(target_address)
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else:
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await device.start_advertising(auto_restart=True)
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await hci_transport.source.terminated
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# -----------------------------------------------------------------------------
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bumble.logging.setup_basic_logging('DEBUG')
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asyncio.run(main())
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