code: public void setPresenceBasedDelivery(boolean presenceBased)  {
          addField(ConfigureNodeFields.presence_based_delivery, FormField.Type.bool);
          setAnswer(ConfigureNodeFields.presence_based_delivery.getFieldName(), presenceBased);
      }
docs: Sets whether to deliver notifications to available users only.
  
  @param presenceBased true if user must be available, false otherwise