點播即點對點通信,也就是在兩個設(shè)備之間進行通信决左，不允許有第三個設(shè)備收到信息撒踪。

點播描述的就是網(wǎng)絡(luò)中兩個節(jié)點之間相互通信的過程，通過16bit短地址來確定通信對象浦箱。

1. step 1 定義點播方式
   打開SampleApp.c文件,找到組播吸耿、廣播的定義

afAddrType_t SampleApp_Periodic_DstAddr;
afAddrType_t SampleApp_Flash_DstAddr;

按照上述格式添加點播定義

afAddrType_t SampleApp_PointToPoint_DstAddr;//定義點對點通信

在函數(shù)void SampleApp_Init( uint8 task_id )中配置SampleApp_PointToPoint_DstAddr的相關(guān)參數(shù)（可參考對SampleApp_Periodic_DstAddr和SampleApp_Flash_DstAddr的配置）:

 SampleApp_PointToPoint_DstAddr.addrMode = (afAddrMode_t)afAddr16Bit;//地址類型為點播地址
  SampleApp_PointToPoint_DstAddr.endPoint = SAMPLEAPP_ENDPOINT;
  SampleApp_PointToPoint_DstAddr.addr.shortAddr = 0x0000;//發(fā)送給協(xié)調(diào)器

2. step 2 添加點對點發(fā)送函數(shù)
   　　復(fù)制函數(shù)void SampleApp_SendPeriodicMessage( void )祠锣，修改相應(yīng)的變量即可

/*********************************************************************
 * @fn      SampleApp_SendPointToPointMessage
 *
 * @brief   Send the point to pont message .
 *
 * @param   none
 *
 * @return  none
 */
void SampleApp_SendPointToPointMessage()
{
    uint8 data[10]={'0','1','2','3','4','5','6','7','8','9'};//定義發(fā)送內(nèi)容
   // uint8 data[10]="0123456789";//上述方式二選一 
if(AF_DataRequest(&SampleApp_PointToPoint_DstAddr,&SampleApp_epDesc,
                      SAMPLEAPP_POINTTOPOINT_CLUSTERID,
                      10,
                      data,
                      &SampleApp_TransID,
                      AF_DISCV_ROUTE,
                      AF_DEFAULT_RADIUS) == afStatus_SUCCESS)
    {
    }
    else
    {
      // Error occurred in request to send.
    }
}

函數(shù)實現(xiàn)后請在SampleApp.c文件開頭添加函數(shù)聲明

void SampleApp_SendPointToPointMessage(void);

除此之外，還要添加SAMPLEAPP_POINTTOPOINT_CLUSTERID的定義咽安，具體位置可通過在SAMPLEAPP_PERIODIC_CLUSTERID上右鍵Go to definition of SAMPLEAPP_PERIODIC_CLUSTERID來確定伴网。

#define SAMPLEAPP_POINTTOPOINT_CLUSTERID  3

將宏定義SAMPLEAPP_MAX_CLUSTERS的值更改為３

#define SAMPLEAPP_MAX_CLUSTERS       3

找到函數(shù)uint16 SampleApp_ProcessEvent( uint8 task_id, uint16 events )，在周期性事件SAMPLEAPP_SEND_PERIODIC_MSG_EVT中調(diào)用點對點通信發(fā)送函數(shù)妆棒，同時注釋掉原有的SampleApp_SendPeriodicMessage();函數(shù)：

if ( events & SAMPLEAPP_SEND_PERIODIC_MSG_EVT )
  {
    // Send the periodic message
    //SampleApp_SendPeriodicMessage();//周期廣播發(fā)送函數(shù)
    SampleApp_SendPeriodicMessage();  //點對點通信發(fā)送函數(shù)

    // Setup to send message again in normal period (+ a little jitter)
    osal_start_timerEx( SampleApp_TaskID, SAMPLEAPP_SEND_PERIODIC_MSG_EVT,
        (SAMPLEAPP_SEND_PERIODIC_MSG_TIMEOUT + (osal_rand() & 0x00FF)) );

    // return unprocessed events
    return (events ^ SAMPLEAPP_SEND_PERIODIC_MSG_EVT);
  }

3. 修改消息接收ID
   　　在函數(shù)void SampleApp_MessageMSGCB( afIncomingMSGPacket_t *pkt )中澡腾，修改clusterId，將原有周期發(fā)送的SAMPLEAPP_PERIODIC_CLUSTERID更改為點對點通信的SAMPLEAPP_POINTTOPOINT_CLUSTERID糕珊，然后將接收的數(shù)據(jù)打印到串口动分，具體代碼如下：

void SampleApp_MessageMSGCB( afIncomingMSGPacket_t *pkt )
{
    uint16 flashTime;
    
    switch ( pkt->clusterId )
    {
        //case SAMPLEAPP_PERIODIC_CLUSTERID:
        //break;
    case SAMPLEAPP_POINTTOPOINT_CLUSTERID:
        HalUARTWrite(0,"Point_To_Point Communication\n",29);
        //此處不要用sizeof計算字符串長度，否則會導(dǎo)致串口顯示的數(shù)據(jù)出錯或者不完整
        HalUARTWrite(0,pkt->cmd.Data,pkt->cmd.DataLength);//打印收到的數(shù)據(jù)
        HalUARTWrite(0,"\n",1);//換行
        break;
        
    case SAMPLEAPP_FLASH_CLUSTERID:
        flashTime = BUILD_UINT16(pkt->cmd.Data[1], pkt->cmd.Data[2] );
        HalLedBlink( HAL_LED_4, 4, 50, (flashTime / 4) );
        break;
    }
}

4. 注釋協(xié)調(diào)器的周期事件
   　　協(xié)調(diào)器不需要周期性發(fā)送數(shù)據(jù)红选，在函數(shù)uint16 SampleApp_ProcessEvent( uint8 task_id, uint16 events )注釋掉協(xié)調(diào)器的周期性事件

if ( //(SampleApp_NwkState == DEV_ZB_COORD)||//協(xié)調(diào)器的周期性事件
               (SampleApp_NwkState == DEV_ROUTER)
              || (SampleApp_NwkState == DEV_END_DEVICE) )
          {
            // Start sending the periodic message in a regular interval.
            osal_start_timerEx( SampleApp_TaskID,
                              SAMPLEAPP_SEND_PERIODIC_MSG_EVT,
                              SAMPLEAPP_SEND_PERIODIC_MSG_TIMEOUT );
          }

5. 上電測試
   　將修改后的程序分別以CoordinatorEB澜公、RouterEB和EndDeviceEB的方式分別下載到三個節(jié)點中，并通過串口與PC相連喇肋，在串口中查看接收到的信息如下圖坟乾。

串口測試結(jié)果

附
　　注意一下定義的區(qū)別和用法：