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125 lines
4.5 KiB
Python
125 lines
4.5 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 os
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import logging
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from colors import color
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from bumble.core import ProtocolError
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from bumble.controller import Controller
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from bumble.device import Device, Peer
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from bumble.host import Host
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from bumble.link import LocalLink
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from bumble.utils import AsyncRunner
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from bumble.gatt import (
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Service,
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Characteristic,
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Descriptor,
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show_services,
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GATT_CHARACTERISTIC_USER_DESCRIPTION_DESCRIPTOR,
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GATT_MANUFACTURER_NAME_STRING_CHARACTERISTIC,
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GATT_DEVICE_INFORMATION_SERVICE
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)
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# -----------------------------------------------------------------------------
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class ClientListener(Device.Listener):
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def __init__(self, device):
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self.device = device
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@AsyncRunner.run_in_task()
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async def on_connection(self, connection):
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print(f'=== Client: connected to {connection}')
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# Discover all services
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print('=== Discovering services')
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peer = Peer(connection)
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await peer.discover_services()
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await peer.discover_characteristics()
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for service in peer.services:
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for characteristic in service.characteristics:
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await peer.discover_descriptors(characteristic)
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print('=== Services discovered')
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show_services(peer.services)
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# Discover all attributes
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print('=== Discovering attributes')
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attributes = await peer.discover_attributes()
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for attribute in attributes:
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print(attribute)
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print('=== Attributes discovered')
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# Read all attributes
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for attribute in attributes:
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try:
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value = await peer.read_value(attribute)
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print(color(f'0x{attribute.handle:04X} = {value.hex()}', 'green'))
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except ProtocolError as error:
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print(color(f'cannot read {attribute.handle:04X}:', 'red'), error)
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# -----------------------------------------------------------------------------
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class ServerListener(Device.Listener):
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def on_connection(self, connection):
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print(f'### Server: connected to {connection}')
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# -----------------------------------------------------------------------------
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async def main():
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# Create a local link
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link = LocalLink()
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# Setup a stack for the client
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client_controller = Controller("client controller", link = link)
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client_host = Host()
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client_host.controller = client_controller
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client_device = Device("client", address = 'F0:F1:F2:F3:F4:F5', host = client_host)
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client_device.listener = ClientListener(client_device)
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await client_device.power_on()
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# Setup a stack for the server
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server_controller = Controller("server controller", link = link)
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server_host = Host()
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server_host.controller = server_controller
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server_device = Device("server", address = 'F6:F7:F8:F9:FA:FB', host = server_host)
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server_device.listener = ServerListener()
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await server_device.power_on()
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# Add a few entries to the device's GATT server
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descriptor = Descriptor(GATT_CHARACTERISTIC_USER_DESCRIPTION_DESCRIPTOR, Descriptor.READABLE, 'My Description')
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manufacturer_name_characteristic = Characteristic(
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GATT_MANUFACTURER_NAME_STRING_CHARACTERISTIC,
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Characteristic.READ,
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Characteristic.READABLE,
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"Fitbit",
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[descriptor]
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)
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device_info_service = Service(GATT_DEVICE_INFORMATION_SERVICE, [
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manufacturer_name_characteristic
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])
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server_device.add_service(device_info_service)
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# Connect the client to the server
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await client_device.connect(server_device.address)
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await asyncio.get_running_loop().create_future()
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# -----------------------------------------------------------------------------
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logging.basicConfig(level = os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
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asyncio.run(main())
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