我可以将蓝牙耳机与笔记本电脑配对一次。但是当我断开耳机时，我无法再次重新连接。唯一有效的方法是重新启动蓝牙守护进程：
service bluetooth restart
当我这样做时，我在日志中看到以下内容：
bluetoothd: Terminating
bluetoothd: Stopping hci0 event socket
bluetoothd: Stopping SDP server
bluetoothd: Exit
bluetoothd: Bluetooth daemon 4.99
bluetoothd: Starting SDP server
bluetoothd: Excluding (conf) network
bluetoothd: Excluding (conf) gatt_example
bluetoothd: Excluding (conf) time
bluetoothd: Excluding (conf) alert
bluetoothd: Failed to open RFKILL control device
bluetoothd: Listening for HCI events on hci0
bluetoothd: HCI dev 0 up
bluetoothd: Proximity GATT Reporter Driver: Operation not permitted (1)
bluetoothd: Could not get the contents of DMI chassis type
bluetoothd: Unable to load keys to adapter_ops: Function not implemented (38)
bluetoothd: Adapter /org/bluez/8237/hci0 has been enabled
然后我就可以成功连接耳机了：
bluetoothd: Can't open input device: No such file or directory (2)
bluetoothd: AVRCP: failed to init uinput for 44:66:a7:81:3C:84
bluetoothd: Badly formated or unrecognized command: AT+XEVENT=Bose SoundLink,158
bluetoothd: Badly formated or unrecognized command: AT+BIA=0,0,0,1,1,1,0
但是当我断开它们并尝试再次连接时，它不起作用，并且我在日志中看不到任何内容。
为什么断开连接后无法重新连接耳机？为什么我必须重新启动蓝牙守护程序？我怎样才能解决这个问题 ？
我在 Debian 上使用bluez 4.99。
我正在使用自定义内核 4.4。
我正在使用 alsa（没有pulseaudio）。
答案1
某些品牌的耳机存在问题。我遇到了同样的问题，这个重新连接蓝牙耳机的 python 脚本对我有用。
确保至少安装了 python 3.5。有关如何使用脚本的说明在标题中是不言自明的：
https://gist.github.com/pylover/d68be364adac5f946887b85e6ed6e7ae
编辑：我已将此脚本的最新代码作为请求包含在这个答案中，但我建议从提供的链接获取最新的迭代，因为作者总是更新脚本。
#! /usr/bin/env python3.5
"""
Fixing bluetooth stereo headphone/headset problem in ubuntu 16.04 and also debian jessie, with bluez5.
Workaround for bug: https://bugs.launchpad.net/ubuntu/+source/indicator-sound/+bug/1577197
Run it with python3.5 or higher after pairing/connecting the bluetooth stereo headphone.
This will be only fixes the bluez5 problem mentioned above .
Licence: Freeware
See ``python3.5 a2dp.py -h``.
Shorthands:
$ alias speakers="a2dp.py 10:08:C1:44:AE:BC"
$ alias headphones="a2dp.py 00:22:37:3D:DA:50"
$ alias headset="a2dp.py 00:22:37:F8:A0:77 -p hsp"
$ speakers
Check here for the latest updates: https://gist.github.com/pylover/d68be364adac5f946887b85e6ed6e7ae
Thanks to:
* https://github.com/DominicWatson, for adding the ``-p/--profile`` argument.
* https://github.com/IzzySoft, for mentioning wait before connecting again.
* https://github.com/AmploDev, for v0.4.0
* https://github.com/Mihara, for autodetect & autorun service
* https://github.com/dabrovnijk, for systemd service
Change Log
----------
- 0.5.0
* Autodetect & autorun service
- 0.4.1
* Sorting device list
- 0.4.0
* Adding ignore_fail argument by @AmploDev.
* Sending all available streams into selected sink, after successfull connection by @AmploDev.
- 0.3.3
* Updating default sink before turning to ``off`` profile.
- 0.3.2
* Waiting a bit: ``-w/--wait`` before connecting again.
- 0.3.0
* Adding -p / --profile option for using the same script to switch between headset and A2DP audio profiles
- 0.2.5
* Mentioning [mac] argument.
- 0.2.4
* Removing duplicated devices in select device list.
- 0.2.3
* Matching ANSI escape characters. Tested on 16.10 & 16.04
- 0.2.2
* Some sort of code enhancements.
- 0.2.0
* Adding `-V/--version`, `-w/--wait` and `-t/--tries` CLI arguments.
- 0.1.1
* Supporting the `[NEW]` prefix for devices & controllers as advised by @wdullaer
* Drying the code.
"""
import sys
import re
import asyncio
import subprocess as sb
import argparse
__version__ = '0.4.0'
HEX_DIGIT_PATTERN = '[0-9A-F]'
HEX_BYTE_PATTERN = '%s{2}' % HEX_DIGIT_PATTERN
MAC_ADDRESS_PATTERN = ':'.join((HEX_BYTE_PATTERN, ) * 6)
DEVICE_PATTERN = re.compile('^(?:.*\s)?Device\s(?P<mac>%s)\s(?P<name>.*)' % MAC_ADDRESS_PATTERN)
CONTROLLER_PATTERN = re.compile('^(?:.*\s)?Controller\s(?P<mac>%s)\s(?P<name>.*)' % MAC_ADDRESS_PATTERN)
WAIT_TIME = .75
TRIES = 4
PROFILE = 'a2dp'
_profiles = {
'a2dp': 'a2dp_sink',
'hsp': 'headset_head_unit',
'off': 'off'
}
# CLI Arguments
parser = argparse.ArgumentParser(prog=sys.argv[0])
parser.add_argument('-e', '--echo', action='store_true', default=False,
help='If given, the subprocess stdout will be also printed on stdout.')
parser.add_argument('-w', '--wait', default=WAIT_TIME, type=float,
help='The seconds to wait for subprocess output, default is: %s' % WAIT_TIME)
parser.add_argument('-t', '--tries', default=TRIES, type=int,
help='The number of tries if subprocess is failed. default is: %s' % TRIES)
parser.add_argument('-p', '--profile', default=PROFILE,
help='The profile to switch to. available options are: hsp, a2dp. default is: %s' % PROFILE)
parser.add_argument('-V', '--version', action='store_true', help='Show the version.')
parser.add_argument('mac', nargs='?', default=None)
# Exceptions
class SubprocessError(Exception):
pass
class RetryExceededError(Exception):
pass
class BluetoothctlProtocol(asyncio.SubprocessProtocol):
def __init__(self, exit_future, echo=True):
self.exit_future = exit_future
self.transport = None
self.output = None
self.echo = echo
def listen_output(self):
self.output = ''
def not_listen_output(self):
self.output = None
def pipe_data_received(self, fd, raw):
d = raw.decode()
if self.echo:
print(d, end='')
if self.output is not None:
self.output += d
def process_exited(self):
self.exit_future.set_result(True)
def connection_made(self, transport):
self.transport = transport
print('Connection MADE')
async def send_command(self, c):
stdin_transport = self.transport.get_pipe_transport(0)
# noinspection PyProtectedMember
stdin_transport._pipe.write(('%s\n' % c).encode())
async def search_in_output(self, expression, fail_expression=None):
if self.output is None:
return None
for l in self.output.splitlines():
if fail_expression and re.search(fail_expression, l, re.IGNORECASE):
raise SubprocessError('Expression "%s" failed with fail pattern: "%s"' % (l, fail_expression))
if re.search(expression, l, re.IGNORECASE):
return True
async def send_and_wait(self, cmd, wait_expression, fail_expression='fail'):
try:
self.listen_output()
await self.send_command(cmd)
while not await self.search_in_output(wait_expression.lower(), fail_expression=fail_expression):
await wait()
finally:
self.not_listen_output()
async def disconnect(self, mac):
print('Disconnecting the device.')
await self.send_and_wait('disconnect %s' % ':'.join(mac), 'Successful disconnected')
async def connect(self, mac):
print('Connecting again.')
await self.send_and_wait('connect %s' % ':'.join(mac), 'Connection successful')
async def trust(self, mac):
await self.send_and_wait('trust %s' % ':'.join(mac), 'trust succeeded')
async def quit(self):
await self.send_command('quit')
async def get_list(self, command, pattern):
result = set()
try:
self.listen_output()
await self.send_command(command)
await wait()
for l in self.output.splitlines():
m = pattern.match(l)
if m:
result.add(m.groups())
return sorted(list(result), key=lambda i: i[1])
finally:
self.not_listen_output()
async def list_devices(self):
return await self.get_list('devices', DEVICE_PATTERN)
async def list_paired_devices(self):
return await self.get_list('paired-devices', DEVICE_PATTERN)
async def list_controllers(self):
return await self.get_list('list', CONTROLLER_PATTERN)
async def select_paired_device(self):
print('Selecting device:')
devices = await self.list_paired_devices()
count = len(devices)
if count < 1:
raise SubprocessError('There is no connected device.')
elif count == 1:
return devices[0]
for i, d in enumerate(devices):
print('%d. %s %s' % (i+1, d[0], d[1]))
print('Select device[1]:')
selected = input()
return devices[0 if not selected.strip() else (int(selected) - 1)]
async def wait():
return await asyncio.sleep(WAIT_TIME)
async def execute_command(cmd, ignore_fail=False):
p = await asyncio.create_subprocess_shell(cmd, stdout=sb.PIPE, stderr=sb.PIPE)
stdout, stderr = await p.communicate()
stdout, stderr = \
stdout.decode() if stdout is not None else '', \
stderr.decode() if stderr is not None else ''
if p.returncode != 0 or stderr.strip() != '':
message = 'Command: %s failed with status: %s\nstderr: %s' % (cmd, p.returncode, stderr)
if ignore_fail:
print('Ignoring: %s' % message)
else:
raise SubprocessError(message)
return stdout
async def execute_find(cmd, pattern, tries=0, fail_safe=False):
tries = tries or TRIES
message = 'Cannot find `%s` using `%s`.' % (pattern, cmd)
retry_message = message + ' Retrying %d more times'
while True:
stdout = await execute_command(cmd)
match = re.search(pattern, stdout)
if match:
return match.group()
elif tries > 0:
await wait()
print(retry_message % tries)
tries -= 1
continue
if fail_safe:
return None
raise RetryExceededError('Retry times exceeded: %s' % message)
async def find_dev_id(mac, **kw):
return await execute_find('pactl list cards short', 'bluez_card.%s' % '_'.join(mac), **kw)
async def find_sink(mac, **kw):
return await execute_find('pacmd list-sinks', 'bluez_sink.%s' % '_'.join(mac), **kw)
async def set_profile(device_id, profile):
print('Setting the %s profile' % profile)
try:
return await execute_command('pactl set-card-profile %s %s' % (device_id, _profiles[profile]))
except KeyError:
print('Invalid profile: %s, please select one one of a2dp or hsp.' % profile, file=sys.stderr)
raise SystemExit(1)
async def set_default_sink(sink):
print('Updating default sink to %s' % sink)
return await execute_command('pacmd set-default-sink %s' % sink)
async def move_streams_to_sink(sink):
streams = await execute_command('pacmd list-sink-inputs | grep "index:"', True)
for i in streams.split():
i = ''.join(n for n in i if n.isdigit())
if i != '':
print('Moving stream %s to sink' % i)
await execute_command('pacmd move-sink-input %s %s' % (i, sink))
return sink
async def main(args):
global WAIT_TIME, TRIES
if args.version:
print(__version__)
return 0
mac = args.mac
# Hacking, Changing the constants!
WAIT_TIME = args.wait
TRIES = args.tries
exit_future = asyncio.Future()
transport, protocol = await asyncio.get_event_loop().subprocess_exec(
lambda: BluetoothctlProtocol(exit_future, echo=args.echo), 'bluetoothctl'
)
try:
if mac is None:
mac, _ = await protocol.select_paired_device()
mac = mac.split(':' if ':' in mac else '_')
print('Device MAC: %s' % ':'.join(mac))
device_id = await find_dev_id(mac, fail_safe=True)
if device_id is None:
print('It seems device: %s is not connected yet, trying to connect.' % ':'.join(mac))
await protocol.trust(mac)
await protocol.connect(mac)
device_id = await find_dev_id(mac)
sink = await find_sink(mac, fail_safe=True)
if sink is None:
await set_profile(device_id, args.profile)
sink = await find_sink(mac)
print('Device ID: %s' % device_id)
print('Sink: %s' % sink)
await set_default_sink(sink)
await wait()
await set_profile(device_id, 'off')
if args.profile is 'a2dp':
await protocol.disconnect(mac)
await wait()
await protocol.connect(mac)
device_id = await find_dev_id(mac)
print('Device ID: %s' % device_id)
await set_profile(device_id, args.profile)
await set_default_sink(sink)
await move_streams_to_sink(sink)
except (SubprocessError, RetryExceededError) as ex:
print(str(ex), file=sys.stderr)
return 1
finally:
print('Exiting bluetoothctl')
await protocol.quit()
await exit_future
# Close the stdout pipe
transport.close()
if args.profile == 'a2dp':
print('"Enjoy" the HiFi stereo music :)')
else:
print('"Enjoy" your headset audio :)')
if __name__ == '__main__':
sys.exit(asyncio.get_event_loop().run_until_complete(main(parser.parse_args())))
答案2
我可以告诉你几件事：
a) 我在 Linux 下使用蓝牙的（一点）经验告诉我通常是坏的；那里或这里我总是有某种问题。
b)bluez 4.99于 2012 年 3 月发布，因此您使用的是非常非常旧的版本；我建议您（如果可以的话）至少测试一个新版本。
这些应该可以解释你的问题。