emacs-send-notify.el

     (dbus-call-method
       :session "org.freedesktop.Notifications"
       "/org/freedesktop/Notifications"
       "org.freedesktop.Notifications" "Notify"
       "GNU Emacs"                 ;; Application name.
       0                           ;; No replacement of other notifications.
       ""                          ;; No icon.
       "Notification summary"      ;; Summary.
       (format                     ;; Body.
         "This is a test notification, raised from %s" (emacs-version))
       '(:array)                   ;; No actions (empty array of strings).
       '(:array :signature "{sv}") ;; No hints
                                   ;; (empty array of dictionary entries).
       ':int32 -1)                 ;; Default timeout.