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Bluetooth Low Energy platform Agnostic Klient

Project description


Bleak Logo Documentation Status

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.


$ pip install bleak


  • 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.


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:

loop = asyncio.get_event_loop()

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


0.6.1 (2020-03-09)

  • 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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