nixos/extra/bluetooth-audio.nix

{ config, lib, pkgs, ... }:
let
  unstable = import <nixos-unstable> { config = { allowUnfree = true; }; };
in
{
  hardware.bluetooth = {
    enable = true;
    package = pkgs.bluezFull;
    settings = {
      General = {
        Enable = "Source,Sink,Media,Socket";
      };
    };
  };
  services.blueman.enable = true;
  environment.systemPackages = with pkgs; [
    unstable.sony-headphones-client
  ];
}