DBusSignalCallbackFunc
val DBusSignalCallbackFunc: <Error class: unknown class><<Error class: unknown class><(<Error class: unknown class><<Error class: unknown class>>, <Error class: unknown class><<Error class: unknown class>>?, <Error class: unknown class><<Error class: unknown class>>, <Error class: unknown class><<Error class: unknown class>>, <Error class: unknown class><<Error class: unknown class>>, <Error class: unknown class><<Error class: unknown class>>) -> Unit>>