TODO

   1 Low-priority items:
   2
   3 1. The status determination (on, off, error) should really be the
   4    responsibility of the HDAPS code. Currently, the plugin handles all
   5    of the "on" states. An HdapsState structure might be appropriate.
   6
   7 2. Replace FILENAME_MAX with something that won't cause problems on
   8    Unices without path length limits.