@Override
 public boolean isReachable(DeviceId deviceId) {
   NetconfDevice netconfDevice = controller.getNetconfDevice(deviceId);
   if (netconfDevice == null) {
     log.debug(
         "Requested device id: {} is not associated to any " + "NETCONF Device",
         deviceId.toString());
     return false;
   }
   return netconfDevice.isActive();
 }