树莓派蓝牙音频双向转发（中继）卡顿问题求助

• 需求：用树莓派作为蓝牙音频接收器，将手机等蓝牙音频源的音频路由到选定的蓝牙音箱播放
• 当前状态：安装PulseAudio蓝牙模块后，通过bluez可实现基础功能——连接树莓派与音箱、手机与树莓派后，PulseAudio能将默认音源路由至默认音频输出端，但音频存在严重卡顿；直接向音箱发送测试音频则播放正常
• 怀疑方向：推测卡顿由蓝牙协议栈的收发切换导致，但无法确认；目前仅找到添加第二个蓝牙适配器的解决方案

附bluetoothctl操作日志：

$ bluetoothctl
Agent registered
[CHG] Controller 2C:CF:67:14:1F:AB Pairable: yes
[bluetooth]# devices
Device 00:22:D9:00:1B:6B Audioengine 5+
Device D4:3A:2C:83:C2:78 Pixel 7
[bluetooth]# connect 00:22:D9:00:1B:6B 
Attempting to connect to 00:22:D9:00:1B:6B
[CHG] Device 00:22:D9:00:1B:6B Connected: yes
[NEW] Endpoint /org/bluez/hci0/dev_00_22_D9_00_1B_6B/sep7 
[NEW] Endpoint /org/bluez/hci0/dev_00_22_D9_00_1B_6B/sep5 
[NEW] Endpoint /org/bluez/hci0/dev_00_22_D9_00_1B_6B/sep3 
[NEW] Endpoint /org/bluez/hci0/dev_00_22_D9_00_1B_6B/sep1 
[NEW] Transport /org/bluez/hci0/dev_00_22_D9_00_1B_6B/sep7/fd0 
Connection successful
[CHG] Transport /org/bluez/hci0/dev_00_22_D9_00_1B_6B/sep7/fd0 State: active
[CHG] Device 00:22:D9:00:1B:6B ServicesResolved: yes
[CHG] Transport /org/bluez/hci0/dev_00_22_D9_00_1B_6B/sep7/fd0 State: idle
[CHG] Device D4:3A:2C:83:C2:78 Connected: yes
[NEW] Endpoint /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/sep1 
[NEW] Endpoint /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/sep2 
[NEW] Endpoint /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/sep3 
[NEW] Endpoint /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/sep4 
[NEW] Endpoint /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/sep5 
[NEW] Endpoint /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/sep6 
[NEW] Transport /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/fd1 
[CHG] Transport /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/fd1 Volume: 0x0066 (102)
[CHG] Transport /org/bluez/hci0/dev_00_22_D9_00_1B_6B/sep7/fd0 State: active
[NEW] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 [default]
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Equalizer: off
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Repeat: alltracks
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Shuffle: off
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Scan: off
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Type: Audio
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Subtype: None
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Status: paused
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Name: Bluetooth Player
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Title: I DON'T WANNA TALK
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 TrackNumber: 0x00000001 (1)
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 NumberOfTracks: 0x00000032 (50)
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Duration: 0x00000000 (0)
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Artist: Carter Vail
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Position: 0x00025ae3 (154339)
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Position: 0x00025ae3 (154339)
[CHG] Transport /org/bluez/hci0/dev_00_22_D9_00_1B_6B/sep7/fd0 State: idle
[CHG] Transport /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/fd1 State: pending
[CHG] Transport /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/fd1 State: active
[CHG] Transport /org/bluez/hci0/dev_00_22_D9_00_1B_6B/sep7/fd0 State: active
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Status: playing
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Position: 0x00026df2 (159218)
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Position: 0x00026e56 (159318)
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Status: paused
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Position: 0x00028872 (166002)
[CHG] Player /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/player0 Position: 0x00028872 (166002)
[CHG] Transport /org/bluez/hci0/dev_D4_3A_2C_83_C2_78/fd1 State: idle

内容的提问来源于stack exchange，提问作者KarlBerger