Enable bluetooth.

nodes/hosts/common/configuration.nix

@@ -10,6 +10,7 @@
     ./services/desktopmanager.nix
     ./services/displaymanager.nix
     ./services/sound.nix
+    ./system/bluetooth.nix
   ];
 
   nixpkgs = {

nodes/hosts/common/system/bluetooth.nix

@@ -0,0 +1,5 @@
+{ ... }: {
+  hardware.bluetooth.enable = true; # enables support for Bluetooth
+  hardware.bluetooth.powerOnBoot = true; # powers up the default Bluetooth controller on boot
+}
+