从NV中读取之前保存的网络信息

改函数的功能就是读取NV之前保存的网络信息，将之前写进NV中的信息读出来：

uint8 ZDApp_RestoreNetworkState( void )

{

  uint8 nvStat;

  nwkActiveKeyItems keyItems;

  // Initialize NWK NV items

  nvStat = NLME_InitNV();

  if ( nvStat != NV_OPER_FAILED )

  {

    if ( NLME_RestoreFromNV() )

    {

      // Are we a coordinator

      ZDAppNwkAddr.addr.shortAddr = NLME_GetShortAddr();

      if ( ZDAppNwkAddr.addr.shortAddr == 0 )

        ZDO_Config_Node_Descriptor.LogicalType = NODETYPE_COORDINATOR;

      devStartMode = MODE_RESUME;

      osal_cpyExtAddr( ZDO_UseExtendedPANID, _NIB.extendedPANID );

    }

    else

      nvStat = NV_ITEM_UNINIT;

    if ( ZG_SECURE_ENABLED )

    {

      nwkFrameCounterChanges = 0;

      osal_memset( &keyItems, 0, sizeof( nwkActiveKeyItems ) );

      osal_nv_item_init( ZCD_NV_NWKKEY, sizeof(nwkActiveKeyItems), (void *)&keyItems );

      if ( ZG_BUILD_COORDINATOR_TYPE && ZG_DEVICE_COORDINATOR_TYPE )

      {

        ZDApp_RestoreNwkKey();

      }

    }

    // The default for RxOnWhenIdle is true for Routers and false for end devices

    // [setup in the NLME_RestoreFromNV()].  Change it here if you want something

    // other than default.

  }

  if ( nvStat == ZSUCCESS )

    return ( ZDO_INITDEV_RESTORED_NETWORK_STATE );

  else

    return ( ZDO_INITDEV_NEW_NETWORK_STATE );

}