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1# Copyright 2021-2022 Google LLC
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#      https://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15# -----------------------------------------------------------------------------
16# Imports
17# -----------------------------------------------------------------------------
18import asyncio
19import sys
20import os
21import random
22import logging
23
24from bumble.device import Device, Connection
25from bumble.transport import open_transport_or_link
26from bumble.gatt import Service, Characteristic
27
28
29# -----------------------------------------------------------------------------
30class Listener(Device.Listener, Connection.Listener):
31    def __init__(self, device):
32        self.device = device
33
34    def on_connection(self, connection):
35        print(f'=== Connected to {connection}')
36        connection.listener = self
37
38    def on_disconnection(self, reason):
39        print(f'### Disconnected, reason={reason}')
40
41    def on_characteristic_subscription(
42        self, connection, characteristic, notify_enabled, indicate_enabled
43    ):
44        print(
45            f'$$$ Characteristic subscription for handle {characteristic.handle} '
46            f'from {connection}: '
47            f'notify {"enabled" if notify_enabled else "disabled"}, '
48            f'indicate {"enabled" if indicate_enabled else "disabled"}'
49        )
50
51
52# -----------------------------------------------------------------------------
53# Alternative way to listen for subscriptions
54# -----------------------------------------------------------------------------
55def on_my_characteristic_subscription(peer, enabled):
56    print(f'### My characteristic from {peer}: {"enabled" if enabled else "disabled"}')
57
58
59# -----------------------------------------------------------------------------
60async def main():
61    if len(sys.argv) < 3:
62        print('Usage: run_notifier.py <device-config> <transport-spec>')
63        print('example: run_notifier.py device1.json usb:0')
64        return
65
66    print('<<< connecting to HCI...')
67    async with await open_transport_or_link(sys.argv[2]) as (hci_source, hci_sink):
68        print('<<< connected')
69
70        # Create a device to manage the host
71        device = Device.from_config_file_with_hci(sys.argv[1], hci_source, hci_sink)
72        device.listener = Listener(device)
73
74        # Add a few entries to the device's GATT server
75        characteristic1 = Characteristic(
76            '486F64C6-4B5F-4B3B-8AFF-EDE134A8446A',
77            Characteristic.READ | Characteristic.NOTIFY,
78            Characteristic.READABLE,
79            bytes([0x40]),
80        )
81        characteristic2 = Characteristic(
82            '8EBDEBAE-0017-418E-8D3B-3A3809492165',
83            Characteristic.READ | Characteristic.INDICATE,
84            Characteristic.READABLE,
85            bytes([0x41]),
86        )
87        characteristic3 = Characteristic(
88            '8EBDEBAE-0017-418E-8D3B-3A3809492165',
89            Characteristic.READ | Characteristic.NOTIFY | Characteristic.INDICATE,
90            Characteristic.READABLE,
91            bytes([0x42]),
92        )
93        characteristic3.on('subscription', on_my_characteristic_subscription)
94        custom_service = Service(
95            '50DB505C-8AC4-4738-8448-3B1D9CC09CC5',
96            [characteristic1, characteristic2, characteristic3],
97        )
98        device.add_services([custom_service])
99
100        # Debug print
101        for attribute in device.gatt_server.attributes:
102            print(attribute)
103
104        # Get things going
105        await device.power_on()
106
107        # Connect to a peer
108        if len(sys.argv) > 3:
109            target_address = sys.argv[3]
110            print(f'=== Connecting to {target_address}...')
111            await device.connect(target_address)
112        else:
113            await device.start_advertising(auto_restart=True)
114
115        while True:
116            await asyncio.sleep(3.0)
117            characteristic1.value = bytes([random.randint(0, 255)])
118            await device.notify_subscribers(characteristic1)
119            characteristic2.value = bytes([random.randint(0, 255)])
120            await device.indicate_subscribers(characteristic2)
121            characteristic3.value = bytes([random.randint(0, 255)])
122            await device.notify_subscribers(characteristic3)
123            await device.indicate_subscribers(characteristic3)
124
125
126# -----------------------------------------------------------------------------
127logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
128asyncio.run(main())
129