Fix Bluetooth audio on your uConsole.

$ systemctl status bluetooth
● bluetooth.service - Bluetooth service
   Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled)
   Active: active (running)
# If "inactive" or "failed", run:
$ sudo systemctl enable --now bluetooth

$ bluetoothctl show
Controller DC:A6:32:XX:XX:XX (public)
  Name: uconsole
  Powered: yes
  Discoverable: no
  Pairable: yes

# If "No default controller available", check rfkill:
$ rfkill list
0: hci0: Bluetooth
  Soft blocked: no
  Hard blocked: no
# If soft blocked:
$ rfkill unblock bluetooth

$ dmesg | grep -i bluetooth
# Look for errors like:
#   "firmware file not found" → missing firmware blob
#   "hci0: command timeout" → USB power management issue
#   "Can't change to HCI mode" → driver conflict

# Check if PulseAudio or PipeWire is active
$ pactl info | head -5
Server String: /run/user/1000/pulse/native
Server Name: pulseaudio
# (or "PipeWire" if using PipeWire)

# List audio sinks — your BT device should appear here
$ pactl list sinks short
0  alsa_output.platform-sound.stereo-fallback  ...  RUNNING
# If no bluetooth sink, the BT audio module isn't loaded

$ dpkg -l | grep -E "bluetooth|pulseaudio-module|pipewire"
# You need at minimum:
#   bluez               — core bluetooth stack
#   pulseaudio-module-bluetooth  (for PulseAudio)
#     OR
#   pipewire-pulse + libspa-0.2-bluetooth  (for PipeWire)

$ sudo apt update
$ sudo apt install -y pulseaudio-module-bluetooth bluez-tools
$ sudo systemctl restart bluetooth

# Add these lines at the end of the file:
$ cat >> ~/.config/pulse/default.pa << 'EOF'

### Bluetooth support
load-module module-bluetooth-policy
load-module module-bluetooth-discover
EOF

# Or load them immediately without restart:
$ pactl load-module module-bluetooth-policy
$ pactl load-module module-bluetooth-discover

$ bluetoothctl
[bluetooth]# power on
Changing power on succeeded
[bluetooth]# agent on
Agent registered
[bluetooth]# default-agent
Default agent request successful
[bluetooth]# scan on
Discovery started
[NEW] Device AA:BB:CC:DD:EE:FF Your-Speaker-Name
[bluetooth]# scan off
[bluetooth]# pair AA:BB:CC:DD:EE:FF
Attempting to pair with AA:BB:CC:DD:EE:FF
[CHG] Device AA:BB:CC:DD:EE:FF Paired: yes
Pairing successful
[bluetooth]# trust AA:BB:CC:DD:EE:FF
[CHG] Device AA:BB:CC:DD:EE:FF Trusted: yes
Changing AA:BB:CC:DD:EE:FF trust succeeded
[bluetooth]# connect AA:BB:CC:DD:EE:FF
Attempting to connect to AA:BB:CC:DD:EE:FF
[CHG] Device AA:BB:CC:DD:EE:FF Connected: yes
Connection successful
[bluetooth]# quit

# Find your bluetooth card
$ pactl list cards short
0  bluez_card.AA_BB_CC_DD_EE_FF  ...

# Switch to A2DP sink profile
$ pactl set-card-profile bluez_card.AA_BB_CC_DD_EE_FF a2dp-sink

# Set it as the default audio output
$ pactl set-default-sink bluez_sink.AA_BB_CC_DD_EE_FF.a2dp-sink

# Enable bluetooth service on boot
$ sudo systemctl enable bluetooth

# Enable auto-connect for paired devices
$ sudo nano /etc/bluetooth/main.conf
# Uncomment or add under [Policy]:
[Policy]
AutoEnable=true

# Restart to apply
$ sudo systemctl restart bluetooth

$ sudo apt update
$ sudo apt install -y pipewire pipewire-pulse pipewire-audio \
  wireplumber libspa-0.2-bluetooth

# Remove PulseAudio bluetooth module (conflicts with PipeWire)
$ sudo apt remove -y pulseaudio-module-bluetooth

# PipeWire replaces PulseAudio automatically via pipewire-pulse
# Verify the switch:
$ pactl info | grep "Server Name"
Server Name: PipeWire

# Enable PipeWire and WirePlumber for your user
$ systemctl --user enable pipewire pipewire-pulse wireplumber
$ systemctl --user start pipewire pipewire-pulse wireplumber

# Verify everything is running
$ systemctl --user status pipewire wireplumber
● pipewire.service - PipeWire Multimedia Service
   Active: active (running)
● wireplumber.service - WirePlumber session manager
   Active: active (running)

$ mkdir -p ~/.config/wireplumber/bluetooth.lua.d

$ cat > ~/.config/wireplumber/bluetooth.lua.d/51-bluetooth-config.lua << 'EOF'
-- Prefer high-quality codecs in this order
bluez_monitor.properties = {
  ["bluez5.enable-sbc-xq"] = true,
  ["bluez5.enable-msbc"] = true,
  ["bluez5.enable-hw-volume"] = true,
  ["bluez5.headset-roles"] = "[ hsp_hs hsp_ag hfp_hf hfp_ag ]",
  ["bluez5.codecs"] = "[ sbc sbc_xq aac ldac aptx aptx_hd ]",
  ["bluez5.default.rate"] = 48000,
  ["bluez5.default.channels"] = 2,
}
EOF

# Restart WirePlumber to apply
$ systemctl --user restart wireplumber

# Pair your device (same as before)
$ bluetoothctl
[bluetooth]# scan on
[bluetooth]# pair AA:BB:CC:DD:EE:FF
[bluetooth]# trust AA:BB:CC:DD:EE:FF
[bluetooth]# connect AA:BB:CC:DD:EE:FF
[bluetooth]# quit

# Verify the connection and codec with PipeWire
$ pw-dump | grep -A5 "api.bluez5.codec"
  "api.bluez5.codec": "sbc_xq",
  "api.bluez5.profile": "a2dp-sink",

# Or use wpctl for a cleaner view
$ wpctl status
Audio
 ├─ Sinks:
 │   *  47. Your-Speaker-Name [vol: 0.74]

# List sinks and find the BT device ID
$ wpctl status
# Note the sink ID number (e.g., 47)

# Set as default
$ wpctl set-default 47

# Test audio
$ speaker-test -t wav -c 2
# Or play something:
$ mpv --ao=pulse your-audio-file.mp3

$ sudo cat > /etc/udev/rules.d/50-bluetooth-no-autosuspend.rules << 'EOF'
# Disable autosuspend for all Bluetooth USB adapters
ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="0a5c", \
  ATTR{power/autosuspend}="-1"
# Broadcom (built-in CM4)
ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="0bda", \
  ATTR{power/autosuspend}="-1"
# Realtek (TP-Link UB500, ASUS BT500)
EOF

# Reload udev rules
$ sudo udevadm control --reload-rules
$ sudo udevadm trigger

# Verify autosuspend is disabled
$ cat /sys/bus/usb/devices/*/power/autosuspend
# Should show -1 for your BT adapter

# Option 1: Switch WiFi to 5GHz (if your router supports it)
# 5GHz doesn't interfere with BT's 2.4GHz band
$ sudo nmcli device wifi connect "YourSSID_5G" password "pass"

# Option 2: Reduce WiFi power to give BT more airtime
$ sudo iwconfig wlan0 txpower 10

# Option 3: Set BT coexistence mode (CM4 specific)
$ sudo nano /boot/config.txt
# Add:
dtparam=ant2

# This improves antenna sharing between WiFi and BT
# Reboot required after changing config.txt

# Edit the kernel command line (all on one line!)
$ sudo nano /boot/cmdline.txt

# Add these parameters to the existing line:
usbcore.autosuspend=-1 btusb.enable_autosuspend=0

# The full line might look like:
# console=serial0,115200 ... rootwait usbcore.autosuspend=-1 btusb.enable_autosuspend=0

# Reboot to apply
$ sudo reboot

# Create a systemd override to prevent BT power management
$ sudo mkdir -p /etc/systemd/system/bluetooth.service.d

$ sudo cat > /etc/systemd/system/bluetooth.service.d/override.conf << 'EOF'
[Service]
ExecStartPost=/bin/bash -c 'for f in /sys/bus/usb/devices/*/power/autosuspend; do echo -1 > "$f" 2>/dev/null; done'
ExecStartPost=/bin/bash -c 'for f in /sys/bus/usb/devices/*/power/control; do echo on > "$f" 2>/dev/null; done'
EOF

$ sudo systemctl daemon-reload
$ sudo systemctl restart bluetooth

# Also prevent TLP from managing BT (if TLP is installed)
$ sudo nano /etc/tlp.conf
# Add:
USB_AUTOSUSPEND=0
# Or target only BT:
USB_DENYLIST="0a5c:* 0bda:*"