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Bluetooth Low Energy platform Agnostic Klient

Project description

bleak

Bleak Logo Build and Test https://img.shields.io/pypi/v/bleak.svg Documentation Status https://img.shields.io/badge/code%20style-black-000000.svg

Bleak is an acronym for Bluetooth Low Energy platform Agnostic Klient.

Bleak is a GATT client software, capable of connecting to BLE devices acting as GATT servers. It is designed to provide a asynchronous, cross-platform Python API to connect and communicate with e.g. sensors.

Installation

$ pip install bleak

Features

  • Supports Windows 10, version 16299 (Fall Creators Update) or greater
  • Supports Linux distributions with BlueZ >= 5.43
  • OS X/macOS support via Core Bluetooth API, from at least OS X version 10.11

Bleak supports reading, writing and getting notifications from GATT servers, as well as a function for discovering BLE devices.

Usage

To discover Bluetooth devices that can be connected to:

import asyncio
from bleak import discover

async def run():
    devices = await discover()
    for d in devices:
        print(d)

loop = asyncio.get_event_loop()
loop.run_until_complete(run())

Connect to a Bluetooth device and read its model number:

import asyncio
from bleak import BleakClient

address = "24:71:89:cc:09:05"
MODEL_NBR_UUID = "00002a24-0000-1000-8000-00805f9b34fb"

async def run(address, loop):
    async with BleakClient(address, loop=loop) as client:
        model_number = await client.read_gatt_char(MODEL_NBR_UUID)
        print("Model Number: {0}".format("".join(map(chr, model_number))))

loop = asyncio.get_event_loop()
loop.run_until_complete(run(address, loop))

See examples folder for more code, for instance example code for connecting to a TI SensorTag CC2650

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

0.7.1 (2020-07-02)

Changed

  • Improved, more explantory error on BlueZ backend when BleakClient cannot find the desired device when trying to connect. (#238)
  • Better-than-nothing documentation about scanning filters added (#230).
  • Ran black on code which was forgotten in 0.7.0. Large diffs due to that.
  • Re-adding Python 3.8 CI “tests” on Windows again.

Fixed

  • Fix when characteristic updates value faster than asyncio schedule (#240 & #241)

0.7.0 (2020-06-30)

Added

  • Better feedback of communication errors to user in .NET backend and implementing error details proposed in #174.
  • Two devices example file to use for e.g. debugging.
  • Detection/discovery callbacks in Core Bluetooth backend Scanner implemented.
  • Characteristic handle printout in service_explorer.py.
  • Added scanning filters to .NET backend’s discover method.

Changed

  • Replace NSRunLoop with dispatch queue in Core Bluetooth backend. This causes callbacks to be dispatched on a background thread instead of on the main dispatch queue on the main thread. call_soon_threadsafe() is used to synchronize the events with the event loop where the central manager was created. Fixes #111.
  • The Central Manager is no longer global in the Core Bluetooth backend. A new one is created for each BleakClient and BleakScanner. Fixes #206 and #105.
  • Merged #167 and reworked characteristics handling in Bleak. Implemented in all backends; bleak now uses the characteristics’ handle to identify and keep track of them. Fixes #139 and #159 and allows connection for devices with multiple instances of the same characteristic UUIDs.
  • In requirements.txt and Pipfile, the requirement on pythonnet was bumped to version 2.5.1, which seems to solve issues described in #217 and #225.
  • Renamed HISTORY.rst to CHANGELOG.rst and adopted the Keep a Changelog format.
  • Python 3.5 support from macOS is officially removed since pyobjc>6 requires 3.6+
  • Pin pyobjc dependencies to use at least version 6.2. (PR #194)
  • Pin development requirement on bump2version to version 1.0.0
  • Added .pyup.yml for Pyup
  • Using CBManagerState constants from pyobj instead of integers.

Removed

  • Removed documentation note about not using new event loops in Linux. This was fixed by #143.
  • _central_manager_delegate_ready was removed in macOS backend.
  • Removed the bleak.backends.bluez.utils.get_gatt_service_path method. It is not used by bleak and possibly generates errors.

Fixed

  • Improved handling of the txdbus connection to avoid hanging of disconnection clients in BlueZ backend. Fixes #216, #219 & #221.
  • #150 hints at the device path not being possible to create as is done in the get_device_object_path method. Now, we try to get it from BlueZ first. Otherwise, use the old fallback.
  • Minor documentation errors corrected.
  • CBManagerStatePoweredOn is now properly handled in Core Bluetooth.
  • Device enumeration in discover``and ``Scanner corrected. Fixes #211
  • Updated documentation about scanning filters.
  • Added workaround for isScanning attribute added in macOS 10.13. Fixes #234.

0.6.4 (2020-05-20)

Fixed

  • Fix for bumpversion usage

0.6.3 (2020-05-20)

Added

  • Building and releasing from Github Actions

Removed

  • Building and releasing on Azure Pipelines

0.6.2 (2020-05-15)

Added

  • Added disconnection_callback functionality for Core Bluetooth (#184 & #186)
  • Added requirements.txt

Fixed

  • Better cleanup of Bluez notifications (#154)
  • Fix for read_gatt_char in Core Bluetooth (#177)
  • Fix for is_disconnected in Core Bluetooth (#187 & #185)
  • Documentation fixes

0.6.1 (2020-03-09)

Fixed

  • Including #156, lost notifications on macOS backend, which was accidentally missed on previous release.

0.6.0 (2020-03-09)

  • New Scanner object to allow for async device scanning.
  • Updated txdbus requirement to version 1.1.1 (Merged #122)
  • Implemented write_gatt_descriptor for Bluez backend.
  • Large change in Bluez backend handling of Twisted reactors. Fixes #143
  • Modified set_disconnect_callback to actually call the callback as a callback. Fixes #108.
  • Added another required parameter to disconnect callbacks.
  • Added Discovery filter option in BlueZ backend (Merged #124)
  • Merge #138: comments about Bluez version check.
  • Improved scanning data for macOS backend. Merge #126.
  • Merges #141, a critical fix for macOS.
  • Fix for #114, write with response on macOS.
  • Fix for #87, DIctionary changes size on .NET backend.
  • Fix for #127, uuid or str on macOS.
  • Handles str/uuid for characteristics better.
  • Merge #148, Run .NET backend notifications on event loop instead of main loop.
  • Merge #146, adapt characteristic write log to account for WriteWithoutResponse on macOS.
  • Fix for #145, Error in cleanup on Bluez backend.
  • Fix for #151, only subscribe to BlueZ messages on DBus. Merge #152.
  • Fix for #142, Merge #144, Improved scanning for macOS backend.
  • Fix for #155, Merge #156, lost notifications on macOS backend.
  • Improved type hints
  • Improved error handling for .NET backend.
  • Documentation fixes.

0.5.1 (2019-10-09)

  • Active Scanning on Windows, #99 potentially solving #95
  • Longer timeout in service discovery on BlueZ
  • Added timeout to constructors and connect methods
  • Fix for get_services on macOS. Relates to #101
  • Fixes for disconnect callback on BlueZ, #86 and #83
  • Fixed reading of device name in BlueZ. It is not readable as regular characteristic. #104
  • Removed logger feedback in BlueZ discovery method.
  • More verbose exceptions on macOS, #117 and #107

0.5.0 (2019-08-02)

  • macOS support added (thanks to @kevincar)
  • Merged #90 which fixed #89: Leaking callbacks in BlueZ
  • Merged #92 which fixed #91, Prevent leaking of DBus connections on discovery
  • Merged #96: Regex patterns
  • Merged #86 which fixed #83 and #82
  • Recovered old .NET discovery method to try for #95
  • Merged #80: macOS development

0.4.3 (2019-06-30)

  • Fix for #76
  • Fix for #69
  • Fix for #74
  • Fix for #68
  • Fix for #70
  • Merged #66

0.4.2 (2019-05-17)

  • Fix for missed part of PR #61.

0.4.1 (2019-05-17)

  • Merging of PR #61, improvements and fixes for multiple issues for BlueZ backend
  • Implementation of issue #57
  • Fixing issue #59
  • Documentation fixes.

0.4.0 (2019-04-10)

  • Transferred code from the BleakUWPBridge C# support project to pythonnet code
  • Fixed BlueZ >= 5.48 issues regarding Battery Service
  • Fix for issue #55

0.3.0 (2019-03-18)

  • Fix for issue #53: Windows and Python 3.7 error
  • Azure Pipelines used for CI

0.2.4 (2018-11-30)

  • Fix for issue #52: Timing issue getting characteristics
  • Additional fix for issue #51.
  • Bugfix for string method for BLEDevice.

0.2.3 (2018-11-28)

  • Fix for issue #51: dpkg-query not found on all Linux systems

0.2.2 (2018-11-08)

  • Made it compliant with Python 3.5 by removing f-strings

0.2.1 (2018-06-28)

  • Improved logging on .NET discover method
  • Some type annotation fixes in .NET code

0.2.0 (2018-04-26)

  • Project added to Github
  • First version on PyPI.
  • Working Linux (BlueZ DBus API) backend.
  • Working Windows (UWP Bluetooth API) backend.

0.1.0 (2017-10-23)

  • Bleak created.

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