timerMsg = MESSAGE_Alloc(node,
                               APP_LAYER,
                               APP_LOOKUP_SERVER,
                               MSG_APP_TimerExpired);

switch (msg->eventType)
     {
         case MSG_APP_TimerExpired:
         {
             AppTimer *timer;
 
             timer = (AppTimer *) MESSAGE_ReturnInfo(msg);
 
             switch (timer->type)
             {
                 case APP_TIMER_SEND_PKT:
                 クライアントへの送信