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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 bumble.logging
from bumble.colors import color
from bumble.controller import Controller
from bumble.core import ProtocolError
from bumble.device import Device, Peer
from bumble.gatt import (
GATT_CHARACTERISTIC_USER_DESCRIPTION_DESCRIPTOR,
GATT_DEVICE_INFORMATION_SERVICE,
GATT_MANUFACTURER_NAME_STRING_CHARACTERISTIC,
Characteristic,
Descriptor,
Service,
)
from bumble.gatt_client import show_services
from bumble.hci import Address
from bumble.host import Host
from bumble.link import LocalLink
# -----------------------------------------------------------------------------
class ServerListener(Device.Listener):
def on_connection(self, connection):
print(f'### Server: connected to {connection}')
# -----------------------------------------------------------------------------
async def main() -> None:
# Create a local link
link = LocalLink()
# Setup a stack for the client
client_controller = Controller("client controller", link=link)
client_host = Host()
client_host.controller = client_controller
client_device = Device(
"client", address=Address('F0:F1:F2:F3:F4:F5'), host=client_host
)
await client_device.power_on()
# Setup a stack for the server
server_controller = Controller("server controller", link=link)
server_host = Host()
server_host.controller = server_controller
server_device = Device(
"server", address=Address('F6:F7:F8:F9:FA:FB'), host=server_host
)
server_device.listener = ServerListener()
await server_device.power_on()
# Add a few entries to the device's GATT server
descriptor = Descriptor(
GATT_CHARACTERISTIC_USER_DESCRIPTION_DESCRIPTOR,
Descriptor.READABLE,
'My Description'.encode(),
)
manufacturer_name_characteristic = Characteristic[bytes](
GATT_MANUFACTURER_NAME_STRING_CHARACTERISTIC,
Characteristic.Properties.READ,
Characteristic.READABLE,
"Fitbit".encode(),
[descriptor],
)
device_info_service = Service(
GATT_DEVICE_INFORMATION_SERVICE, [manufacturer_name_characteristic]
)
server_device.add_service(device_info_service)
# Connect the client to the server
connection = await client_device.connect(server_device.random_address)
print(f'=== Client: connected to {connection}')
# Discover all services
print('=== Discovering services')
peer = Peer(connection)
await peer.discover_services()
for service in peer.services:
await service.discover_characteristics()
for characteristic in service.characteristics:
await characteristic.discover_descriptors()
print('=== Services discovered')
show_services(peer.services)
# Discover all attributes
print('=== Discovering attributes')
attributes = await peer.discover_attributes()
for attribute in attributes:
print(attribute)
print('=== Attributes discovered')
# Read all attributes
for attribute in attributes:
try:
value = await attribute.read_value()
print(color(f'0x{attribute.handle:04X} = {value.hex()}', 'green'))
except ProtocolError as error:
print(color(f'cannot read {attribute.handle:04X}:', 'red'), error)
await asyncio.get_running_loop().create_future()
# -----------------------------------------------------------------------------
bumble.logging.setup_basic_logging('DEBUG')
asyncio.run(main())
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