(PECL gupnp >= 0.1.0)
gupnp_device_action_callback_set — Set device callback function
$root_device
   , int $signal
   , string $action_name
   , mixed $callback
   [, mixed $arg
  ] )Set device callback function for signal and action.
root_deviceA root device identifier, returned by gupnp_root_device_new().
signalThe value of signal. Signal can be one of the following values:
GUPNP_SIGNAL_ACTION_INVOKEDGUPNP_SIGNAL_NOTIFY_FAILEDaction_nameThe name of action.
callback
       The callback function for the certain signal. Typically, callback function 
       takes on three parameters. The service parameter's 
       identifier being the first, action parameter's 
       identifier (in case GUPNP_SIGNAL_ACTION_INVOKED signal) or 
       error parameter's message (in case GUPNP_SIGNAL_NOTIFY_FAILED 
       signal) being the second, and the arg is third. 
      
arg
       User data for callback. 
      
   Returns TRUE on success or FALSE on failure.
  
Issues E_WARNING either with not valid callback function or with not valid signal.