* relaying devices over network.
  Of course sending unixfds over ethernet is impossible, so this means a
  local dbus service collecting the requests and relaying them via the network
  to some client that passes them to the dbus service actually managing the
  device.
* Configuring dbus_service.py.
  What configuration language?
* Easy method to construct wrappers.
  When wrapping a binary the name is occupied twice, so the second entry from
  $PATH should be taken. Something like this maybe:
  exec dbus_client --... --second-path "$0" "$@"
* More documentation.
  Manual pages?
* State across restarts?
  When restarting the service all state is lost. Maybe detect device state on
  startup and at least serialize the timed activations?
* Activate multiple devices from one command.