Bluetooth configuration

Using the same format as the ALSA monitor, the configuration file bluetooth.lua.d/50-bluez-config.lua is charged to configure the Bluetooth devices and nodes created by WirePlumber.

bluez_monitor.properties

A Lua object that contains generic client configuration properties in the for of key pairs.

Example:
```
bluez_monitor.properties = {
  ["bluez5.enable-msbc"] = true,
}
```
This example will enable the MSBC codec in connected Bluetooth devices that support it.

The list of valid properties are:
```
["bluez5.enable-sbc-xq"] = true
```
Enables the SBC-XQ codec in connected Blueooth devices that support it
```
["bluez5.enable-msbc"] = true
```
Enables the MSBC codec in connected Blueooth devices that support it
```
["bluez5.enable-hw-volume"] = true
```
Enables hardware volume controls in Bluetooth devices that support it
```
["bluez5.headset-roles"] = "[ hsp_hs hsp_ag hfp_hf hfp_ag ]"
```
Enabled headset roles (default: [ hsp_hs 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) and hfp_ag (HFP Audio Gateway)
```
["bluez5.codecs"] = "[ sbc sbc_xq aac ]"
```
Enables sbc, sbc_zq and aac A2DP codecs.

Supported codecs: sbc, sbc_xq, aac, ldac, aptx, aptx_hd, aptx_ll, aptx_ll_duplex, faststream, faststream_duplex.

All codecs are supported by default.
```
["bluez5.hfphsp-backend"] = "native"
```
HFP/HSP backend (default: native). Available values: any, none, hsphfpd, ofono or native.
```
["bluez5.default.rate"] = 48000
```
The bluetooth default audio rate.
```
["bluez5.default.channels"] = 2
```
The bluetooth default number of channels.
bluez_monitor.rules

Like in the ALSA configuration, this is a Lua array that can contain objects with rules for a Bluetooth device or node. Those objects have 2 properties. The first one is matches, which allows users to define rules to match a Bluetooth device or node. The second property is apply_properties, and it is used to apply properties on the matched Bluetooth device or node.

Example:
```
{
  matches = {
    {
      { "device.name", "matches", "bluez_card.*" },
    },
  },
  apply_properties = {
     ["bluez5.auto-connect"]  = "[ hfp_hf hsp_hs a2dp_sink ]"
  }
}
```
This will set the auto-connect property to hfp_hf, hsp_hs and a2dp_sink on bluetooth devices whose name matches the bluez_card.* pattern.

A list of valid properties are:
```
["bluez5.auto-connect"] = "[ hfp_hf hsp_hs a2dp_sink ]"
```
Auto-connect device profiles on start up or when only partial profiles have connected. Disabled by default if the property is not specified.

Supported values are: hfp_hf, hsp_hs, a2dp_sink, hfp_ag, hsp_ag and a2dp_source.
```
["bluez5.hw-volume"] = "[ hfp_ag hsp_ag a2dp_source ]"
```
Hardware volume controls (default: hfp_ag, hsp_ag, and a2dp_source)

Supported values are: hfp_hf, hsp_hs, a2dp_sink, hfp_ag, hsp_ag and a2dp_source.
```
["bluez5.a2dp.ldac.quality"] = "auto"
```
LDAC encoding quality.

Available values: auto (Adaptive Bitrate, default), hq (High Quality, 990/909kbps), sq (Standard Quality, 660/606kbps) and mq (Mobile use Quality, 330/303kbps).
```
["bluez5.a2dp.aac.bitratemode"] = 0
```
AAC variable bitrate mode.

Available values: 0 (cbr, default), 1-5 (quality level).
```
["device.profile"] = "a2dp-sink"
```
Profile connected first.

Available values: a2dp-sink (default) or headset-head-unit.