Bleak can't connect on ubuntu

• bleak version: 0.4.3
• Python version: 3.7.3 & 3.6.8
• Operating System: Xubuntu 18.04

---

• bleak version: 0.4.3
• Python version: 3.6.8
• Operating System: Lubuntu 19.04

---

Description

Bleak randomly throw an exception during any connexion attempt on linux (almost every time):

me@my-computer~$ python3 test.py

Traceback (most recent call last):
  File "/home/me/.local/lib/python3.7/site-packages/bleak/backends/bluezdbus/client.py", line 98, in connect
    ).asFuture(self.loop)
txdbus.error.RemoteError: org.bluez.Error.Failed: Software caused connection abort

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "test.py", line 25, in <module>
    loop.run_until_complete(run(address, loop, True))
  File "/usr/lib/python3.7/asyncio/base_events.py", line 584, in run_until_complete
    return future.result()
  File "test.py", line 18, in run
    async with BleakClient(address, loop=loop) as client:
  File "/home/me/.local/lib/python3.7/site-packages/bleak/backends/client.py", line 41, in __aenter__
    await self.connect()
  File "/home/me/.local/lib/python3.7/site-packages/bleak/backends/bluezdbus/client.py", line 100, in connect
    raise BleakError(str(e))
bleak.exc.BleakError: org.bluez.Error.Failed: Software caused connection abort

---

What I Did

Pasted this program in a file named test.py and then launched it.

import asyncio
from bleak import BleakClient


async def run(address, loop, debug=False):
    async with BleakClient(address, loop=loop) as client:
        x = await client.is_connected()
        print("Connected: {0}".format(x))

if __name__ == "__main__":
    address = "F8:F0:05:F4:C5:B4"
    loop = asyncio.get_event_loop()
    loop.run_until_complete(run(address, loop))

But discover() works well though.

What I’m doing

I created a small benchmark, who launch X times this program and display success/total attempts :

import asyncio, bleak


async def run(address, loop, debug=False):
	try:
		async with bleak.BleakClient(address, loop=loop) as client:
			x = await client.is_connected(timeout=5)
			print(" V", end="", flush=True)
			return True
	except Exception as e:
		print(" X", end="", flush=True)
		return False

if __name__ == "__main__":
	success = 0
	address = "MAC ADDR"

	for i in range(0, 10000):
		loop = asyncio.get_event_loop()
		if loop.run_until_complete(run(address, loop)):
			success += 1
		print("\033[K\r" + str(success) + "/" + str(i + 1), sep=" ", end="", flush=True)
		# \033[K erase the line & \r return to the first char of the line 

Current status:

[corentinbettiol]

I’m on my personal computer right now (xubuntu 18.04 too), I have BlueZ 5.48 and here’s my adapter:

me@home$ lspci -knn | grep Net -A2; lsusb
02:00.0 Network controller [0280]: Intel Corporation Dual Band Wireless-AC 3168NGW [Stone Peak] [8086:24fb] (rev 10)
	Subsystem: Intel Corporation Device [8086:2110]
	Kernel driver in use: iwlwifi
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 1770:ff00  
Bus 001 Device 002: ID 1532:0037 Razer USA, Ltd 
Bus 001 Device 005: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 004: ID 8087:0aa7 Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I’m able to discover some bluetooth devices, as well as using bleak:
(using scan on from bluetoothctl)

(using bleak on an app)

Starting search… Found 3 devices.

---

I updated BlueZ to 5.50, and it’s working fine too (using bluetoothctl and Bleak):

me@home$ bluetoothctl -v
bluetoothctl: 5.50

me@home$ bluetoothctl
Agent registered
[bluetooth]# scan on
Discovery started
[CHG] Controller F8:94:C2:6B:1C:6D Discovering: yes
[CHG] Device 1B:6F:4A:48:94:2D RSSI: -58
[CHG] Device 68:A3:78:2C:B8:68 RSSI: -78
[CHG] Device 90:DD:5D:9C:EA:C9 RSSI: -58
[NEW] Device 51:42:EE:FF:C6:75 51-42-EE-FF-C6-75
[bluetooth]# scan off
Discovery stopped
[CHG] Controller F8:94:C2:6B:1C:6D Discovering: no
[CHG] Device 51:42:EE:FF:C6:75 RSSI is nil
[CHG] Device 90:DD:5D:9C:EA:C9 RSSI is nil
[CHG] Device 68:A3:78:2C:B8:68 RSSI is nil
[CHG] Device 1B:6F:4A:48:94:2D RSSI is nil
[bluetooth]# exit

[hbldh]

I will close this issue and hope that the proposed solution above works.