121 lines
4.4 KiB
Python
121 lines
4.4 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 os
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import random
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import logging
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from bumble.device import Device, Connection
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from bumble.transport import open_transport_or_link
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from bumble.gatt import (
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Service,
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Characteristic
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)
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# -----------------------------------------------------------------------------
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class Listener(Device.Listener, Connection.Listener):
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def __init__(self, device):
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self.device = device
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def on_connection(self, connection):
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print(f'=== Connected to {connection}')
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connection.listener = self
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def on_disconnection(self, reason):
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print(f'### Disconnected, reason={reason}')
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def on_characteristic_subscription(self, connection, characteristic, notify_enabled, indicate_enabled):
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print(
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f'$$$ Characteristic subscription for handle {characteristic.handle} from {connection}: '
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f'notify {"enabled" if notify_enabled else "disabled"}, '
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f'indicate {"enabled" if indicate_enabled else "disabled"}'
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)
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# -----------------------------------------------------------------------------
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async def main():
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if len(sys.argv) < 3:
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print('Usage: run_gatt_server.py <device-config> <transport-spec>')
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print('example: run_gatt_server.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_or_link(sys.argv[2]) as (hci_source, hci_sink):
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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(sys.argv[1], hci_source, hci_sink)
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device.listener = Listener(device)
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# Add a few entries to the device's GATT server
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characteristic1 = Characteristic(
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'486F64C6-4B5F-4B3B-8AFF-EDE134A8446A',
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Characteristic.READ | Characteristic.NOTIFY,
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Characteristic.READABLE,
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bytes([0x40])
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)
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characteristic2 = Characteristic(
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'8EBDEBAE-0017-418E-8D3B-3A3809492165',
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Characteristic.READ | Characteristic.INDICATE,
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Characteristic.READABLE,
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bytes([0x41])
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)
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characteristic3 = Characteristic(
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'8EBDEBAE-0017-418E-8D3B-3A3809492165',
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Characteristic.READ | Characteristic.NOTIFY | Characteristic.INDICATE,
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Characteristic.READABLE,
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bytes([0x42])
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)
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custom_service = Service(
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'50DB505C-8AC4-4738-8448-3B1D9CC09CC5',
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[characteristic1, characteristic2, characteristic3]
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)
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device.add_services([custom_service])
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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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# 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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while True:
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await asyncio.sleep(3.0)
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characteristic1.value = bytes([random.randint(0, 255)])
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await device.notify_subscribers(characteristic1)
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characteristic2.value = bytes([random.randint(0, 255)])
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await device.indicate_subscribers(characteristic2)
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characteristic3.value = bytes([random.randint(0, 255)])
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await device.notify_subscribers(characteristic3)
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await device.indicate_subscribers(characteristic3)
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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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