os/modules/bluetooth/default.nix

{
  lib,
  config,
  pkgs,
  ...
}: {
  hardware.bluetooth = {
    enable = true;
    # Disable bluetooth on startup to save battery
    powerOnBoot = false;
    # Disable useless SIM Access Profile plugin
    disabledPlugins = [
      "sap"
    ];
    settings = {
      General = {
        # Enables experimental features and interfaces.
        # Makes BlueZ Battery Provider available
        Experimental = true;
      };
    };
  };

  services.blueman.enable = true;
  services.pipewire.wireplumber.configPackages = [
    # https://pipewire.pages.freedesktop.org/wireplumber/daemon/configuration/bluetooth.html
    (pkgs.writeTextDir "share/wireplumber/wireplumber.conf.d/10-bluez.conf" ''
      monitor.bluez.properties = {
        bluez5.enable-hw-volume = true
        bluez5.enable-msbc = true
        bluez5.enable-sbc-xq = true
        bluez5.headset-roles = [ hsp_hs hsp_ag hfp_hf hfp_ag ]
      }
    '')
  ];
}