99 lines
3.6 KiB
Python
99 lines
3.6 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 logging
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from colors import color
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from bumble.core import ProtocolError
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from bumble.device import Device, Peer
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from bumble.gatt import show_services
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from bumble.transport import open_transport_or_link
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from bumble.utils import AsyncRunner
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# -----------------------------------------------------------------------------
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class Listener(Device.Listener):
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def __init__(self, device):
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self.device = device
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@AsyncRunner.run_in_task()
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async def on_connection(self, connection):
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print(f'=== Connected to {connection}')
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# Discover all services
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print('=== Discovering services')
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peer = Peer(connection)
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await peer.discover_services()
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for service in peer.services:
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await service.discover_characteristics()
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for characteristic in service.characteristics:
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await characteristic.discover_descriptors()
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print('=== Services discovered')
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show_services(peer.services)
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# Discover all attributes
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print('=== Discovering attributes')
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attributes = await peer.discover_attributes()
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for attribute in attributes:
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print(attribute)
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print('=== Attributes discovered')
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# Read all attributes
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for attribute in attributes:
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try:
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value = await peer.read_value(attribute)
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print(color(f'0x{attribute.handle:04X} = {value.hex()}', 'green'))
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except ProtocolError as error:
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print(color(f'cannot read {attribute.handle:04X}:', 'red'), error)
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except TimeoutError:
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print(color('read timeout'))
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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_client.py <device-config> <transport-spec> [<bluetooth-address>]')
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print('example: run_gatt_client.py device1.json usb:0 E1:CA:72:48:C4:E8')
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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, with a custom listener
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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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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()
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await asyncio.get_running_loop().create_future()
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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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