所謂組播拄踪，就是在網(wǎng)絡(luò)中所有節(jié)點(diǎn)設(shè)備被分組后組內(nèi)相互通信的過(guò)程。

通過(guò)節(jié)點(diǎn)的組號(hào)來(lái)確定通信對(duì)象。

1.組播參數(shù)設(shè)置
　　在文件SampleApp.c中，已經(jīng)定義了組播地址以及組播內(nèi)容

afAddrType_t SampleApp_Flash_DstAddr;//組播地址類型
aps_Group_t SampleApp_Group;//組播內(nèi)容

組播的地址參數(shù)設(shè)置如下：

  // Setup for the flash command's destination address - Group 1
  SampleApp_Flash_DstAddr.addrMode = (afAddrMode_t)afAddrGroup;//地址類型為組播
  SampleApp_Flash_DstAddr.endPoint = SAMPLEAPP_ENDPOINT;
  SampleApp_Flash_DstAddr.addr.shortAddr = SAMPLEAPP_FLASH_GROUP;

組播的分組參數(shù)設(shè)置如下,將原有的ID修改為對(duì)應(yīng)的SAMPLEAPP_FLASH_GROUP贸人，便于以后對(duì)分組的擴(kuò)展：

// By default, all devices start out in Group 1
  //SampleApp_Group.ID = 0x0001;
  SampleAPP_Group.ID=SAMPLEAPP_FLASH_GROUP;//Kevin@20161118
  osal_memcpy( SampleApp_Group.name, "Group 1", 7  );
  aps_AddGroup( SAMPLEAPP_ENDPOINT, &SampleApp_Group );

SAMPLEAPP_FLASH_GROUP的定義在SampleApp.h文件中

// Group ID for Flash Command
#define SAMPLEAPP_FLASH_GROUP                  0x0001

2. 組播發(fā)送函數(shù)
   　　在SampleApp.c文件中添加組播發(fā)送函數(shù)實(shí)現(xiàn)及其函數(shù)聲明间景。

void SampleApp_sendGroupMessage()
{
    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";
    if(AF_DataRequest(&SampleApp_Flash_DstAddr,&SampleApp_epDesc,
                      SAMPLEAPP_FLASH_CLUSTERID,
                      10,
                      data,
                      &SampleApp_TransID,
                      AF_DISCV_ROUTE,
                      AF_DEFAULT_RADIUS) == afStatus_SUCCESS)
    {
    }
    else
    {
      // Error occurred in request to send.
    }
}

其中佃声，SAMPLEAPP_FLASH_CLUSTERID的定義在SampleApp.h文件中：

#define SAMPLEAPP_FLASH_CLUSTERID     2

在函數(shù)uint16 SampleApp_ProcessEvent( uint8 task_id, uint16 events )中調(diào)用組播發(fā)送函數(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_SendPointToPointMessage();  //點(diǎn)對(duì)點(diǎn)通信發(fā)送函數(shù)
    SampleApp_sendGroupMessage();  //組播通信發(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. 組播接收函數(shù)
   　　在函數(shù)void SampleApp_MessageMSGCB( afIncomingMSGPacket_t *pkt )中修改case SAMPLEAPP_FLASH_CLUSTERID

case SAMPLEAPP_FLASH_CLUSTERID:
        HalUARTWrite(0,"Group Message:",14);//提示信息
        HalUARTWrite(0,pkt->cmd.Data,pkt->cmd.DataLength);//打印接收到的數(shù)組
        HalUARTWrite(0,"\n",1);//回車換行
        //flashTime = BUILD_UINT16(pkt->cmd.Data[1], pkt->cmd.Data[2] );
        //HalLedBlink( HAL_LED_4, 4, 50, (flashTime / 4) );
        break;

4.下載程序，查看實(shí)驗(yàn)結(jié)果
　　程序修改完成之后分別以1個(gè)協(xié)調(diào)器倘要、兩個(gè)路由器的方式下載到3個(gè)節(jié)點(diǎn)設(shè)備中圾亏，將協(xié)調(diào)器和路由器1的組號(hào)（Rebuild All之前修改SampleApp_Group.ID的值）設(shè)置為**SAMPLEAPP_FLASH_GROUP **，即0x0001封拧，路由器設(shè)備2設(shè)置為0x0002志鹃，節(jié)點(diǎn)設(shè)備通過(guò)串口與PC相連，查看串口接收的信息泽西。

協(xié)調(diào)器接收到的信息

路由器1收到的信息