builder = g_variant_builder_new(G_VARIANT_TYPE("a{sv}"));
g_variant_builder_add(builder, "{sv}", key, g_variant_new_string(val));
message = g_variant_new("(@a{sv})", g_variant_builder_end(builder));
+ g_variant_builder_unref(builder);
g_dbus_connection_call(connection,
SUPPLICANT_SERVICE,