(PECL gupnp >= 0.1.0)
gupnp_root_device_set_available — Set whether or not root_device is available
$root_device
   , bool $available
   )Controls whether or not root_device is available (announcing its presence).
root_deviceA root device identifier, returned by gupnp_root_device_new().
available
       Set TRUE if root_device should be available.
      
   Returns TRUE on success or FALSE on failure.