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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.att import ATT_INSUFFICIENT_ENCRYPTION_ERROR, ATT_Error
from bumble.device import Connection, Device
from bumble.gatt import (
GATT_CHARACTERISTIC_USER_DESCRIPTION_DESCRIPTOR,
GATT_DEVICE_INFORMATION_SERVICE,
GATT_MANUFACTURER_NAME_STRING_CHARACTERISTIC,
Characteristic,
CharacteristicValue,
Descriptor,
Service,
)
from bumble.transport import open_transport
# -----------------------------------------------------------------------------
class Listener(Device.Listener, Connection.Listener):
def __init__(self, device):
self.device = device
def on_connection(self, connection):
print(f'=== Connected to {connection}')
connection.listener = self
def on_disconnection(self, reason):
print(f'### Disconnected, reason={reason}')
def my_custom_read(connection):
print('----- READ from', connection)
return bytes(f'Hello {connection}', 'ascii')
def my_custom_write(connection, value):
print(f'----- WRITE from {connection}: {value}')
def my_custom_read_with_error(connection):
print('----- READ from', connection, '[returning error]')
if connection.is_encrypted:
return bytes([123])
raise ATT_Error(ATT_INSUFFICIENT_ENCRYPTION_ERROR)
def my_custom_write_with_error(connection, value):
print(f'----- WRITE from {connection}: {value}', '[returning error]')
if not connection.is_encrypted:
raise ATT_Error(ATT_INSUFFICIENT_ENCRYPTION_ERROR)
# -----------------------------------------------------------------------------
async def main() -> None:
if len(sys.argv) < 3:
print(
'Usage: run_gatt_server.py <device-config> <transport-spec> '
'[<bluetooth-address>]'
)
print('example: run_gatt_server.py device1.json usb:0 E1:CA:72:48:C4:E8')
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
)
device.listener = Listener(device)
# 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(
GATT_MANUFACTURER_NAME_STRING_CHARACTERISTIC,
Characteristic.Properties.READ,
Characteristic.READABLE,
'Fitbit'.encode(),
[descriptor],
)
device_info_service = Service(
GATT_DEVICE_INFORMATION_SERVICE, [manufacturer_name_characteristic]
)
custom_service1 = Service(
'50DB505C-8AC4-4738-8448-3B1D9CC09CC5',
[
Characteristic(
'D901B45B-4916-412E-ACCA-376ECB603B2C',
Characteristic.Properties.READ | Characteristic.Properties.WRITE,
Characteristic.READABLE | Characteristic.WRITEABLE,
CharacteristicValue(read=my_custom_read, write=my_custom_write),
),
Characteristic(
'552957FB-CF1F-4A31-9535-E78847E1A714',
Characteristic.Properties.READ | Characteristic.Properties.WRITE,
Characteristic.READABLE | Characteristic.WRITEABLE,
CharacteristicValue(
read=my_custom_read_with_error, write=my_custom_write_with_error
),
),
Characteristic(
'486F64C6-4B5F-4B3B-8AFF-EDE134A8446A',
Characteristic.Properties.READ | Characteristic.Properties.NOTIFY,
Characteristic.READABLE,
bytes('hello', 'utf-8'),
),
],
)
device.add_services([device_info_service, custom_service1])
# Debug print
for attribute in device.gatt_server.attributes:
print(attribute)
# 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())
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