diff --git a/src/application.vala b/src/application.vala
index 62e7e40..a083bd5 100644
--- a/src/application.vala
+++ b/src/application.vala
@@ -33,6 +33,12 @@ public class PipeTap.Application : Adw.Application {
         );
     }
 
+    public override bool dbus_register (GLib.DBusConnection connection, string object_path) {
+        base.dbus_register (connection, object_path);
+        DBus.init (connection, object_path);
+        return true;
+    }
+
     construct {
         ActionEntry[] action_entries = {
             { "about", this.on_about_action },
@@ -124,4 +130,4 @@ public class PipeTap.Application : Adw.Application {
         settings.apply ();
         this.settings.apply ();
     }
-}
\ No newline at end of file
+}
diff --git a/src/dbus-iface.vala b/src/dbus-iface.vala
new file mode 100644
index 0000000..c1e4507
--- /dev/null
+++ b/src/dbus-iface.vala
@@ -0,0 +1,4 @@
+[DBus (name = "io.gitlab.nekocwd.pipetap1")]
+public interface PipeTap.DBus.ServerIface : Object {
+    public abstract int focus { get; set; }
+}
diff --git a/src/dbus.vala b/src/dbus.vala
new file mode 100644
index 0000000..c6b0de8
--- /dev/null
+++ b/src/dbus.vala
@@ -0,0 +1,14 @@
+namespace PipeTap.DBus {
+    public class Server : ServerIface, Object {
+        public int focus {
+            get { message ("Gett"); return Logic.find_ctrl (Logic.Ctrl.CtrlType.Focus).value; }
+            set { message ("Sett %d", value); Logic.find_ctrl (Logic.Ctrl.CtrlType.Focus).value = value; }
+        }
+    }
+    public Server server;
+    public void init (GLib.DBusConnection conn, string path) {
+        server = new Server ();
+        message ("DBUS connection is %snull", conn != null ? "not " : "");
+        conn.register_object<ServerIface> (path, server);
+    }
+}
diff --git a/src/meson.build b/src/meson.build
index 5eaff01..10631db 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -7,6 +7,8 @@ pipetap_sources = [
   'gui/settings.vala',
   'logic/ctrl.vala',
   'logic/wireplumber.vala',
+  'dbus.vala',
+  'dbus-iface.vala',
 ]
 
 wp_api = gnome.generate_vapi(
@@ -21,6 +23,7 @@ add_project_arguments(['--vapidir', meson.current_build_dir()], language: 'vala'
 
 pipetap_deps = [
   config_dep,
+  dependency('gio-2.0'),
   dependency('gtk4'),
   dependency('libadwaita-1', version: '>= 1.4'),
   dependency('gtk4-layer-shell-0'),