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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 random
import sys
import bumble.logging
from bumble.device import Connection, Device
from bumble.gatt import Characteristic, 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 on_characteristic_subscription(
self, connection, characteristic, notify_enabled, indicate_enabled
):
print(
f'$$$ Characteristic subscription for handle {characteristic.handle} '
f'from {connection}: '
f'notify {"enabled" if notify_enabled else "disabled"}, '
f'indicate {"enabled" if indicate_enabled else "disabled"}'
)
# -----------------------------------------------------------------------------
# Alternative way to listen for subscriptions
# -----------------------------------------------------------------------------
def on_my_characteristic_subscription(peer, enabled):
print(f'### My characteristic from {peer}: {"enabled" if enabled else "disabled"}')
# -----------------------------------------------------------------------------
async def main() -> None:
if len(sys.argv) < 3:
print('Usage: run_notifier.py <device-config> <transport-spec>')
print('example: run_notifier.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
)
device.listener = Listener(device)
# Add a few entries to the device's GATT server
characteristic1 = Characteristic(
'486F64C6-4B5F-4B3B-8AFF-EDE134A8446A',
Characteristic.Properties.READ | Characteristic.Properties.NOTIFY,
Characteristic.READABLE,
bytes([0x40]),
)
characteristic2 = Characteristic(
'8EBDEBAE-0017-418E-8D3B-3A3809492165',
Characteristic.Properties.READ | Characteristic.Properties.INDICATE,
Characteristic.READABLE,
bytes([0x41]),
)
characteristic3 = Characteristic(
'8EBDEBAE-0017-418E-8D3B-3A3809492165',
Characteristic.Properties.READ
| Characteristic.Properties.NOTIFY
| Characteristic.Properties.INDICATE,
Characteristic.READABLE,
bytes([0x42]),
)
characteristic3.on('subscription', on_my_characteristic_subscription)
custom_service = Service(
'50DB505C-8AC4-4738-8448-3B1D9CC09CC5',
[characteristic1, characteristic2, characteristic3],
)
device.add_services([custom_service])
# 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)
while True:
await asyncio.sleep(3.0)
characteristic1.value = bytes([random.randint(0, 255)])
await device.notify_subscribers(characteristic1)
characteristic2.value = bytes([random.randint(0, 255)])
await device.indicate_subscribers(characteristic2)
characteristic3.value = bytes([random.randint(0, 255)])
await device.notify_subscribers(characteristic3)
await device.indicate_subscribers(characteristic3)
# -----------------------------------------------------------------------------
bumble.logging.setup_basic_logging('DEBUG')
asyncio.run(main())
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