Installation

sudo pacman -S bluez bluez-utils
# check if btusb kernel module is loaded
sudo lsmod | grep btusb
sudo systemctl enable bluetooth
sudo systemctl start bluetooth

From archlinux wiki:

agent KeyboardOnly
default-agent
power on
scan on
# above command reveals devices
pair *device*

Connecting to device later on.

agent KeyboardOnly
default-agent
power on
devices # shows the devices and their address
connect *address*
trust *address*

Sometimes, when you switch on the bluetooth device you get prompt at blutoothctl shell whether you want to connect or not. In this case you don't need connect *address*

vector@resonyze ~ % bluetoothctl
Waiting to connect to bluetoothd.
[bluetooth]# Agent registered
[bluetooth]# [CHG] Controller CO:3C:59:
[CHG] Device 4 g
Authorize service
yes
[WieCool N1]# Authorize service
[WeCool N11#  1;39m[agent] Authorize service B088111f-8006-1008-8008-00885¢9b34Fb (yes/no): [NEW] Endpoint /org/bluez/hci/dev_41.42_A2_76_C8_F3/sepl
[agent] Authorize service B088111f-0006-1006-8006-0888579b34Fb (yes/no): [NEW] Endpoint /org/bluez/hcib/dev_41_42_A2_76_C8_F3/sep2
[agent] Authorize service B088111f-006-100-8006-0888579b34Fb (yes/no): [NEW] Transport /org/bluez/hci6/dev_41_42_A2.76_C8_F3/dB
[agent] Authorize service 809111-0880-1808-3086-8030579b34fb (yes/no): yes
[WeCool N1]# Authorize service
[WeCool N1]# 1;39m[agent] Authorize service B088118e-0006-1006-8006-088579b34Fb (yes/no): yes
[WeCool N1]# [CHG] Transport /org/bluez/hcib/dev_4142_A2_76_C8_F3/fd8 Volue: 8x007f (127)
[WeCool N1]#
[WeCool N1]#
bluetooth]# hcid new_settings: powered bondable ssp br/edr le secure-conn
:28 Pairable: yes

Attempt at pairing amazon basics bluetooth neckband.

Update

I realized I could press power button + volume down in the neckband and it enters a pairing mode. When the pairing mode is active, the device turned up in bluetoothctl prompt.

Yeah. RTFM moment for me. But I still havent' read the manual though. I can't find it. Oh well.

Old way

Date: 02/17/2024

It was a pain in the ass to connect this device with bluetoothctl. I did the usual stuff in bluetoothctl:

power on
default-agent
scan on

From this point I kept staring at the prompt for notification of device discovery. It comes, but then pairing fails for some reason. Then I do the following:

sudo systemctl restart bluetooth
systemctl --user restart pipewire

And then Ctrl-d out of bluetoothctl. Repeat the afforementioned usual stuff. Nothing.

Then by accident my phone which I connected to the charging cable nearby connects to the device. I turn of its bluetooth. THEN the device address turns up at the at bluetootctl prompt. Then I did:

pair *address*

It works. For some reason it worked now though before it didn't. Finalized with

connect *address*
trust *address*

I hope its gonna be smooth sailing from this point because the device is now listed with devices command at bluetoothctl prompt.

related: switch audio sink

Solution to failed attempt at reconnecting to a previously paired device

https://askubuntu.com/questions/1423297/org-bluez-error-authenticationtimeout-org-bluez-error-failed-br-connection-unkn

Poor sound quality

Update on sound quality

I followed the instructions at https://wiki.archlinux.org/title/PipeWire#Low_audio_quality_on_Bluetooth and did the following:

sudo cp -r /usr/share/pipewire/media-session.d /etc/pipewire/

systemctl --user restart pipewire

/usr/share/pipewire/media-session.d/bluez-monitor.conf:

# Bluez monitor config file for PipeWire version 0.4.2 #
#
# Copy and edit this file in /etc/pipewire/media-session.d/
# for system-wide changes or in
# ~/.config/pipewire/media-session.d/ for local changes.

properties = {
    # These features do not work on all headsets, so they are enabled
    # by default based on the hardware database. They can also be
    # forced on/off for all devices by the following options:

    bluez5.enable-sbc-xq    = true
    bluez5.enable-msbc      = true
    #bluez5.enable-hw-volume = true
    #bluez5.enable-faststream = true

    # See bluez-hardware.conf for the hardware database.

    # Enabled headset roles (default: [ hfp_hf hfp_ag ]), this
    # property only applies to native backend. Currently some headsets
    # (Sony WH-1000XM3) are not working with both hsp_ag and hfp_ag
    # enabled, disable either hsp_ag or hfp_ag to work around it.
    #
    # Supported headset roles: hsp_hs (HSP Headset),
    #                          hsp_ag (HSP Audio Gateway),
    #                          hfp_hf (HFP Hands-Free),
    #                          hfp_ag (HFP Audio Gateway)
    #bluez5.headset-roles = [ hsp_hs hsp_ag hfp_hf hfp_ag ]

    # Enabled A2DP codecs (default: all).
    bluez5.codecs = [ sbc sbc_xq aac ldac aptx aptx_hd aptx_ll aptx_ll_duplex faststream faststream_duplex ]

    # HFP/HSP backend (default: native).
    # Available values: any, none, hsphfpd, ofono, native
    #bluez5.hfphsp-backend = native

    # HFP/HSP native backend modem (default: none).
    # Available values: none, any or the modem device string as found in
    #   'Device' property of org.freedesktop.ModemManager1.Modem interface
    #bluez5.hfphsp-backend-native-modem = none

    # Properties for the A2DP codec configuration
    #bluez5.default.rate     = 48000
    #bluez5.default.channels = 2

    # Register dummy AVRCP player, required for AVRCP volume function.
    # Disable if you are running mpris-proxy or equivalent.
    #bluez5.dummy-avrcp-player = true
}

rules = [
    # An array of matches/actions to evaluate.
    {
        # Rules for matching a device or node. It is an array of
        # properties that all need to match the regexp. If any of the
        # matches work, the actions are executed for the object.
        matches = [
            {
                # This matches all cards.
                device.name = "~bluez_card.*"
            }
        ]
        actions = {
            # Actions can update properties on the matched object.
            update-props = {

                # Auto-connect device profiles on start up or when only partial
                # profiles have connected. Disabled by default if the property
                # is not specified.
                #bluez5.auto-connect = [
                #    hfp_hf
                #    hsp_hs
                #    a2dp_sink
                #    hfp_ag
                #    hsp_ag
                #    a2dp_source
                #]
                bluez5.auto-connect = [ hfp_hf hsp_hs a2dp_sink ]
                # bluez5.auto-connect = [ a2dp_sink ]

                # Hardware volume control (default: all)
                #bluez5.hw-volume = [
                #    hfp_hf
                #    hsp_hs
                #    a2dp_sink
                #    hfp_ag
                #    hsp_ag
                #    a2dp_source
                #]

                # LDAC encoding quality
                # Available values: auto (Adaptive Bitrate, default)
                #                   hq   (High Quality, 990/909kbps)
                #                   sq   (Standard Quality, 660/606kbps)
                #                   mq   (Mobile use Quality, 330/303kbps)
                # bluez5.a2dp.ldac.quality = auto
                bluez5.a2dp.ldac.quality = hq

                # AAC variable bitrate mode
                # Available values: 0 (cbr, default), 1-5 (quality level)
                #bluez5.a2dp.aac.bitratemode = 0

                # Profile connected first
                # Available values: a2dp-sink (default), headset-head-unit
                bluez5.profile = a2dp-sink

                # A2DP <-> HFP profile auto-switching (when device is default output)
                # Available values: false, role (default), true
                # 'role' will switch the profile if the recording application
                # specifies Communication (or "phone" in PA) as the stream role.
                # bluez5.autoswitch-profile = role
                bluez5.autoswitch-profile = false
            }
        }
    }
    {
        matches = [
            {
                # Matches all sources.
                node.name = "~bluez_input.*"
            }
            {
                # Matches all sinks.
                node.name = "~bluez_output.*"
            }
        ]
        actions = {
            update-props = {
                #node.nick                       = "My Node"
                #node.nick                       = null
                #priority.driver                 = 100
                #priority.session                = 100
                node.pause-on-idle               = false
                #resample.quality                = 4
                #channelmix.normalize            = false
                #channelmix.mix-lfe              = false
                #session.suspend-timeout-seconds = 5            # 0 disables suspend
                #monitor.channel-volumes         = false

                # Media source role, "input" or "playback"
                # Defaults to "playback", playing stream to speakers
                # Set to "input" to use as an input for apps
                #bluez5.media-source-role = input
            }
        }
    }
]

Try disconnecting and reconnecting.

Disconnected and reconnected.

pavucontrol

This might be useful. Sound quality is good when profile is A2DP sink.

Update 10/03/2024: Replaced piepwire-session-manager with wireplumber

I switched to wireplumber.

sudo pacman -R pipewire-session-manager
sudo pacman -S wireplumber
sudo mkdir -p /etc/wireplumber/bluetooth.lua.d
sudo cp /usr/share/wireplumber/bluetooth.lua.d/50-bluez-config.lua /etc/wireplumber/bluetooth.lua.d/

Since I had the problem of bluetooth earphones auto-connecting with low quality HSP/HFP profile, I removed hsp hfp from autoconnect as recommended by archwiki: https://wiki.archlinux.org/title/bluetooth_headset#Disable_PipeWire_HSP/HFP_profile

Now /etc/wireplumber/bluetooth.lua.d/50-bluez-config.lua looks like:

bluez_monitor.enabled = true

bluez_monitor.properties = {
  -- Enabled roles (default: [ a2dp_sink a2dp_source bap_sink bap_source hfp_hf hfp_ag ])
  --
  -- Currently some headsets (Sony WH-1000XM3) are not working with
  -- both hsp_ag and hfp_ag enabled, so by default we enable only HFP.
  --
  -- Supported roles: hsp_hs (HSP Headset),
  --                  hsp_ag (HSP Audio Gateway),
  --                  hfp_hf (HFP Hands-Free),
  --                  hfp_ag (HFP Audio Gateway)
  --                  a2dp_sink (A2DP Audio Sink)
  --                  a2dp_source (A2DP Audio Source)
  --                  bap_sink (LE Audio Basic Audio Profile Sink)
  --                  bap_source (LE Audio Basic Audio Profile Source)
  --["bluez5.roles"] = "[ a2dp_sink a2dp_source bap_sink bap_source hsp_hs hsp_ag hfp_hf hfp_ag ]",

  -- Enabled A2DP codecs (default: all).
  --["bluez5.codecs"] = "[ sbc sbc_xq aac ldac aptx aptx_hd aptx_ll aptx_ll_duplex faststream faststream_duplex ]",

  -- HFP/HSP backend (default: native).
  -- Available values: any, none, hsphfpd, ofono, native
  --["bluez5.hfphsp-backend"] = "native",

  -- HFP/HSP native backend modem (default: none).
  -- Available values: none, any or the modem device string as found in
  --   'Device' property of org.freedesktop.ModemManager1.Modem interface
  --["bluez5.hfphsp-backend-native-modem"] = "none",

  -- HFP/HSP hardware offload SCO support (default: false).
  --["bluez5.hw-offload-sco"] = false,

  -- Properties for the A2DP codec configuration
  --["bluez5.default.rate"] = 48000,
  --["bluez5.default.channels"] = 2,

  -- Register dummy AVRCP player, required for AVRCP volume function.
  -- Disable if you are running mpris-proxy or equivalent.
  --["bluez5.dummy-avrcp-player"] = true,

  -- Opus Pro Audio mode settings
  --["bluez5.a2dp.opus.pro.channels"] = 3,  -- no. channels
  --["bluez5.a2dp.opus.pro.coupled-streams"] = 1,  -- no. joint stereo pairs, see RFC 7845 Sec. 5.1.1
  --["bluez5.a2dp.opus.pro.locations"] = "FL,FR,LFE",  -- audio locations
  --["bluez5.a2dp.opus.pro.max-bitrate"] = 600000,
  --["bluez5.a2dp.opus.pro.frame-dms"] = 50,  -- frame duration in 1/10 ms: 25, 50, 100, 200, 400
  --["bluez5.a2dp.opus.pro.bidi.channels"] = 1,  -- same settings for the return direction
  --["bluez5.a2dp.opus.pro.bidi.coupled-streams"] = 0,
  --["bluez5.a2dp.opus.pro.bidi.locations"] = "FC",
  --["bluez5.a2dp.opus.pro.bidi.max-bitrate"] = 160000,
  --["bluez5.a2dp.opus.pro.bidi.frame-dms"] = 400,

  -- Enable the logind module, which arbitrates which user will be allowed
  -- to have bluetooth audio enabled at any given time (particularly useful
  -- if you are using GDM as a display manager, as the gdm user also launches
  -- pipewire and wireplumber).
  -- This requires access to the D-Bus user session; disable if you are running
  -- a system-wide instance of wireplumber.
  ["with-logind"] = true,

  -- The settings below can be used to override feature enabled status. By default
  -- all of them are enabled. They may also be disabled via the hardware quirk
  -- database, see bluez-hardware.conf
  --["bluez5.enable-sbc-xq"] = true,
  --["bluez5.enable-msbc"] = true,
  --["bluez5.enable-hw-volume"] = true,
}

bluez_monitor.rules = {
  -- An array of matches/actions to evaluate.
  {
    -- Rules for matching a device or node. It is an array of
    -- properties that all need to match the regexp. If any of the
    -- matches work, the actions are executed for the object.
    matches = {
      {
        -- This matches all cards.
        { "device.name", "matches", "bluez_card.*" },
      },
    },
    -- Apply properties on the matched object.
    apply_properties = {
      -- Auto-connect device profiles on start up or when only partial
      -- profiles have connected. Disabled by default if the property
      -- is not specified.
      --["bluez5.auto-connect"] = "[ hfp_hf hsp_hs a2dp_sink hfp_ag hsp_ag a2dp_source ]",
      ["bluez5.auto-connect"] = "[ a2dp_sink ]",

      -- Hardware volume control (default: [ hfp_ag hsp_ag a2dp_source ])
      --["bluez5.hw-volume"] = "[ hfp_hf hsp_hs a2dp_sink hfp_ag hsp_ag a2dp_source ]",

      -- LDAC encoding quality
      -- Available values: auto (Adaptive Bitrate, default)
      --                   hq   (High Quality, 990/909kbps)
      --                   sq   (Standard Quality, 660/606kbps)
      --                   mq   (Mobile use Quality, 330/303kbps)
      --["bluez5.a2dp.ldac.quality"] = "auto",

      -- AAC variable bitrate mode
      -- Available values: 0 (cbr, default), 1-5 (quality level)
      --["bluez5.a2dp.aac.bitratemode"] = 0,

      -- Profile connected first
      -- Available values: a2dp-sink (default), headset-head-unit
      --["device.profile"] = "a2dp-sink",

      -- Opus Pro Audio encoding mode: audio, voip, lowdelay
      --["bluez5.a2dp.opus.pro.application"] = "audio",
      --["bluez5.a2dp.opus.pro.bidi.application"] = "audio",
    },
  },
  {
    matches = {
      {
        -- Matches all sources.
        { "node.name", "matches", "bluez_input.*" },
      },
      {
        -- Matches all sinks.
        { "node.name", "matches", "bluez_output.*" },
      },
    },
    apply_properties = {
      --["node.nick"] = "My Node",
      --["priority.driver"] = 100,
      --["priority.session"] = 100,
      --["node.pause-on-idle"] = false,
      --["resample.quality"] = 4,
      --["channelmix.normalize"] = false,
      --["channelmix.mix-lfe"] = false,
      --["session.suspend-timeout-seconds"] = 5,  -- 0 disables suspend
      --["monitor.channel-volumes"] = false,

      -- Media source role, "input" or "playback"
      -- Defaults to "playback", playing stream to speakers
      -- Set to "input" to use as an input for apps
      --["bluez5.media-source-role"] = "input",
    },
  },
}

Disable auto-connect

source: https://www.reddit.com/r/Fedora/comments/iwzct5/comment/hxo9kej

I noticed that my wecool n1 neckband requests approval before connecting but it always connect with the right profile (a2dp_sink), like so:

But my amazon basics neckband connects automatically but with incorrect profile (hsp/hfp). So I tried to disable autoconnect for the neckband expecting then it would connnect with a2dp_sink.

This is possible if you pair the device but don't trust it. Since AB neckband was already paired, I did untrust device in bluetoothctl prompt and rebooted it:

untrust 41:42:73:C1:BD:00

Now it requests permission to connect but it is connecting with the right profile.

Recent mods i made to main.conf file to make reconnecting to bluetooth keyboard faster (not sure if they work).

[General]

# Default adapter name
# Defaults to 'BlueZ X.YZ'
#Name = BlueZ

# Default device class. Only the major and minor device class bits are
# considered. Defaults to '0x000000'.
#Class = 0x000100

# How long to stay in discoverable mode before going back to non-discoverable
# The value is in seconds. Default is 180, i.e. 3 minutes.
# 0 = disable timer, i.e. stay discoverable forever
DiscoverableTimeout = 0

# Always allow pairing even if there are no agent registered
# Possible values: true, false
# Default: false
#AlwaysPairable = false

# How long to stay in pairable mode before going back to non-discoverable
# The value is in seconds. Default is 0.
# 0 = disable timer, i.e. stay pairable forever
#PairableTimeout = 0

# Use vendor id source (assigner), vendor, product and version information for
# DID profile support. The values are separated by ":" and assigner, VID, PID
# and version.
# Possible vendor id source values: bluetooth, usb (default) or false (disabled)
#DeviceID = bluetooth:1234:5678:abcd

# Do reverse service discovery for previously unknown devices that connect to
# us. For BR/EDR this option is really only needed for qualification since the
# BITE tester doesn't like us doing reverse SDP for some test cases, for LE
# this disables the GATT client functionally so it can be used in system which
# can only operate as peripheral (see also GATT Client option).
# Defaults to 'true'.
#ReverseServiceDiscovery = true

# Enable name resolving after inquiry. Set it to 'false' if you don't need
# remote devices name and want shorter discovery cycle. Defaults to 'true'.
#NameResolving = true

# Enable runtime persistency of debug link keys. Default is false which
# makes debug link keys valid only for the duration of the connection
# that they were created for.
#DebugKeys = false

# Restricts all controllers to the specified transport. Default value
# is "dual", i.e. both BR/EDR and LE enabled (when supported by the HW).
# Possible values: "dual", "bredr", "le"
#ControllerMode = dual

# Maximum number of controllers allowed to be exposed to the system.
# Default=0 (unlimited)
#MaxControllers=0

# Enables Multi Profile Specification support. This allows to specify if
# system supports only Multiple Profiles Single Device (MPSD) configuration
# or both Multiple Profiles Single Device (MPSD) and Multiple Profiles Multiple
# Devices (MPMD) configurations.
# Possible values: "off", "single", "multiple"
#MultiProfile = off

# Permanently enables the Fast Connectable setting for adapters that
# support it. When enabled other devices can connect faster to us,
# however the tradeoff is increased power consumptions. This feature
# will fully work only on kernel version 4.1 and newer. Defaults to
# 'false'.
FastConnectable = true

# Default privacy setting.
# Enables use of private address.
# Possible values for LE mode: "off", "network/on", "device"
# Possible values for Dual mode: "off", "network/on", "device",
# "limited-network", "limited-device"
#
# - off: Local privacy disabled.
#
# - network/on: A device will only accept advertising packets from peer
# devices that contain private addresses. It may not be compatible with some
# legacy devices since it requires the use of RPA(s) all the time.
#
# - device: A device in device privacy mode is only concerned about the
# privacy of the device and will accept advertising packets from peer devices
# that contain their Identity Address as well as ones that contain a private
# address, even if the peer device has distributed its IRK in the past.

# - limited-network: Apply Limited Discoverable Mode to advertising, which
# follows the same policy as to BR/EDR that publishes the identity address when
# discoverable, and Network Privacy Mode for scanning.
#
# - limited-device: Apply Limited Discoverable Mode to advertising, which
# follows the same policy as to BR/EDR that publishes the identity address when
# discoverable, and Device Privacy Mode for scanning.
#
# Defaults to "off"
#Privacy = off

# Specify the policy to the JUST-WORKS repairing initiated by peer
# Possible values: "never", "confirm", "always"
# Defaults to "never"
#JustWorksRepairing = never

# How long to keep temporary devices around
# The value is in seconds. Default is 30.
# 0 = disable timer, i.e. temporary devices stay around forever
#TemporaryTimeout = 30

# Enables the device to issue an SDP request to update known services when
# profile is connected. Defaults to true.
#RefreshDiscovery = true

# Default Secure Connections setting.
# Enables the Secure Connections setting for adapters that support it. It
# provides better crypto algorithms for BT links and also enables CTKD (cross
# transport key derivation) during pairing on any link.
# Possible values: "off", "on", "only"
# - "off": Secure Connections are disabled
# - "on": Secure Connections are enabled when peer device supports them
# - "only": we allow only Secure Connections
# Defaults to "on"
#SecureConnections = on

# Enables D-Bus experimental interfaces
# Possible values: true or false
#Experimental = false

# Enables D-Bus testing interfaces
# Possible values: true or false
#Testing = false

# Enables kernel experimental features, alternatively a list of UUIDs
# can be given.
# Possible values: true,false,<UUID List>
# Possible UUIDS:
# d4992530-b9ec-469f-ab01-6c481c47da1c (BlueZ Experimental Debug)
# 671b10b5-42c0-4696-9227-eb28d1b049d6 (BlueZ Experimental Simultaneous Central and Peripheral)
# 15c0a148-c273-11ea-b3de-0242ac130004 (BlueZ Experimental LL privacy)
# 330859bc-7506-492d-9370-9a6f0614037f (BlueZ Experimental Bluetooth Quality Report)
# a6695ace-ee7f-4fb9-881a-5fac66c629af (BlueZ Experimental Offload Codecs)
# 6fbaf188-05e0-496a-9885-d6ddfdb4e03e (BlueZ Experimental ISO socket)
# Defaults to false.
#KernelExperimental = false

# The duration to avoid retrying to resolve a peer's name, if the previous
# try failed.
# The value is in seconds. Default is 300, i.e. 5 minutes.
#RemoteNameRequestRetryDelay = 300

[BR]
# The following values are used to load default adapter parameters for BR/EDR.
# BlueZ loads the values into the kernel before the adapter is powered if the
# kernel supports the MGMT_LOAD_DEFAULT_PARAMETERS command. If a value isn't
# provided, the kernel will be initialized to it's default value.  The actual
# value will vary based on the kernel version and thus aren't provided here.
# The Bluetooth Core Specification should be consulted for the meaning and valid
# domain of each of these values.

# BR/EDR Page scan activity configuration
#PageScanType=
#PageScanInterval=
#PageScanWindow=

# BR/EDR Inquiry scan activity configuration
#InquiryScanType=
#InquiryScanInterval=
#InquiryScanWindow=

# BR/EDR Link supervision timeout
#LinkSupervisionTimeout=

# BR/EDR Page Timeout
#PageTimeout=

# BR/EDR Sniff Intervals
#MinSniffInterval=
#MaxSniffInterval=

[LE]
# Enable/Disable Central Address Resolution.
# 0: disable
# 1: enable
# Defaults to 1
#CentralAddressResolution = 1

# The following values are used to load default adapter parameters for LE.
# BlueZ loads the values into the kernel before the adapter is powered if the
# kernel supports the MGMT_LOAD_DEFAULT_PARAMETERS command. If a value isn't
# provided, the kernel will be initialized to it's default value.  The actual
# value will vary based on the kernel version and thus aren't provided here.
# The Bluetooth Core Specification should be consulted for the meaning and valid
# domain of each of these values.
# LE advertisement interval (used for legacy advertisement interface only)
#MinAdvertisementInterval=
#MaxAdvertisementInterval=
#MultiAdvertisementRotationInterval=

# LE scanning parameters used for passive scanning supporting auto connect
# scenarios
#ScanIntervalAutoConnect=
#ScanWindowAutoConnect=

# LE scanning parameters used for passive scanning supporting wake from suspend
# scenarios
#ScanIntervalSuspend=
#ScanWindowSuspend=

# LE scanning parameters used for active scanning supporting discovery
# proceedure
#ScanIntervalDiscovery=
#ScanWindowDiscovery=

# LE scanning parameters used for passive scanning supporting the advertisement
# monitor Apis
#ScanIntervalAdvMonitor=
#ScanWindowAdvMonitor=

# LE scanning parameters used for connection establishment.
#ScanIntervalConnect=
#ScanWindowConnect=

# LE default connection parameters.  These values are superceeded by any
# specific values provided via the Load Connection Parameters interface
#MinConnectionInterval=
#MaxConnectionInterval=
#ConnectionLatency=
#ConnectionSupervisionTimeout=
#Autoconnecttimeout=

# Scan duration during interleaving scan. Only used when scanning for ADV
# monitors. The units are msec.
# Default: 300
#AdvMonAllowlistScanDuration=
# Default: 500
#AdvMonNoFilterScanDuration=

# Enable/Disable Advertisement Monitor interleave scan for power saving.
# 0: disable
# 1: enable
# Defaults to 1
#EnableAdvMonInterleaveScan=

[GATT]
# GATT attribute cache.
# Possible values:
# always: Always cache attributes even for devices not paired, this is
# recommended as it is best for interoperability, with more consistent
# reconnection times and enables proper tracking of notifications for all
# devices.
# yes: Only cache attributes of paired devices.
# no: Never cache attributes
# Default: always
#Cache = always

# Minimum required Encryption Key Size for accessing secured characteristics.
# Possible values: 0 and 7-16. 0 means don't care.
# Defaults to 0
#KeySize = 0

# Exchange MTU size.
# Possible values: 23-517
# Defaults to 517
#ExchangeMTU = 517

# Number of ATT channels, 1 is mandatory since it is used for ATT fixed channel
# index 2-6 are used for EATT which is optional.
# Possible values: 1-6 (1 disables EATT)
# Default to 1
#Channels = 1

# Export claimed services by plugins
# Possible values: no, read-only, read-write
# Default: read-only
#ExportClaimedServices = read-only

[CSIS]
# SIRK - Set Identification Resolution Key which is common for all the
# sets. They SIRK key is used to identify its sets. This can be any
# 128 bit value or a string value (e.g. product name) which is then hashed.
# Possible Values:
# 16 byte hexadecimal value: 861FAE703ED681F0C50B34155B6434FB
# String value: "My Product Name"
# Defaults to none
#SIRK =

# SIRK Encryption
# Possible values:
# true: Encrypt SIRK when read
# false: Do not encrypt SIRK when read. (plaintext)
# Defaults to true
#Encryption = true

# Total no of sets belongs to this Profile
# Defaults to 0
#Size = 0

# Rank for the device
# Defaults to 0
#Rank = 0

# This enables the GATT client functionally, so it can be disabled in system
# which can only operate as a peripheral.
# Defaults to 'true'.
#Client = true

[AVDTP]
# AVDTP L2CAP Signalling Channel Mode.
# Possible values:
# basic: Use L2CAP Basic Mode
# ertm: Use L2CAP Enhanced Retransmission Mode
#SessionMode = basic

# AVDTP L2CAP Transport Channel Mode.
# Possible values:
# basic: Use L2CAP Basic Mode
# streaming: Use L2CAP Streaming Mode
#StreamMode = basic

[AVRCP]
# Allow SetAbsoluteVolume calls to a peer device that does not advertise the
# AVRCP remote control target profile.  If it does advertise this profile, the
# version is ignored.
#VolumeWithoutTarget = false

# Validate that remote AVRCP profiles advertise the category-2 bit before
# allowing SetAbsoluteVolume calls or registering for EVENT_VOLUME_CHANGED
# notifications.
#VolumeCategory = true

[Policy]
#
# The ReconnectUUIDs defines the set of remote services that should try
# to be reconnected to in case of a link loss (link supervision
# timeout). The policy plugin should contain a sane set of values by
# default, but this list can be overridden here. By setting the list to
# empty the reconnection feature gets disabled.
#ReconnectUUIDs=00001112-0000-1000-8000-00805f9b34fb,0000111f-0000-1000-8000-00805f9b34fb,0000110a-0000-1000-8000-00805f9b34fb,0000110b-0000-1000-8000-00805f9b34fb

# ReconnectAttempts define the number of attempts to reconnect after a link
# lost. Setting the value to 0 disables reconnecting feature.
#ReconnectAttempts=7

# ReconnectIntervals define the set of intervals in seconds to use in between
# attempts.
# If the number of attempts defined in ReconnectAttempts is bigger than the
# set of intervals the last interval is repeated until the last attempt.
#ReconnectIntervals=1,2,4,8,16,32,64

# AutoEnable defines option to enable all controllers when they are found.
# This includes adapters present on start as well as adapters that are plugged
# in later on. Defaults to 'true'.
#AutoEnable=true

# Audio devices that were disconnected due to suspend will be reconnected on
# resume. ResumeDelay determines the delay between when the controller
# resumes from suspend and a connection attempt is made. A longer delay is
# better for better co-existence with Wi-Fi.
# The value is in seconds.
# Default: 2
#ResumeDelay = 2

[AdvMon]
# Default RSSI Sampling Period. This is used when a client registers an
# advertisement monitor and leaves the RSSISamplingPeriod unset.
# Possible values:
# 0x00       Report all advertisements
# N = 0xXX   Report advertisements every N x 100 msec (range: 0x01 to 0xFE)
# 0xFF       Report only one advertisement per device during monitoring period
# Default: 0xFF
#RSSISamplingPeriod=0xFF

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