Home 1.2.0协议中，父节点删除了子节点的AssocList后，会向子节点发LeaveReq。

父节点删除子节点后，又收到了子节点的Data request命令包，父节点会根据Data request返回一个LeaveReq命令，这条命令没有目标extAddr。

所以我在函数里面做了一个这样的处理：节点收到没有目标IEEE地址的LeaveInd命令，不采用ASSOC JOIN的方式入网，而是采用Rejoin的方式寻找一个父节点。

void ZDO_LeaveInd( NLME_LeaveInd_t* ind )
{
  uint8 leave;


  // Parent is requesting the leave - NWK layer filters out illegal
  // requests
  if ( ind->request == TRUE )
  {
    if (osal_ExtAddrEqual(ind->extAddr,NLME_GetExtAddr()))
    {
      // Only respond if we are not rejoining the network
      if ( ind->rejoin == FALSE )
      {
        // Notify network of leave
        NLME_LeaveRsp_t rsp;
        rsp.rejoin = ind->rejoin;

        if ( ZSTACK_ROUTER_BUILD )
        {
          rsp.removeChildren = ind->removeChildren;
        }
        else if ( ZSTACK_END_DEVICE_BUILD )
        {
          rsp.removeChildren = 0;
        }

        NLME_LeaveRsp( &rsp );
      }

      if ( ZSTACK_END_DEVICE_BUILD )
      {
        // Stop polling and get ready to reset
        NLME_SetPollRate( 0 );
      }
      // Prepare to leave with reset
      ZDApp_LeaveReset( ind->rejoin );
    }
    else
    {
      retryCnt = 0;
      devStartMode = MODE_RESUME;
      _tmpRejoinState = true;
      osal_cpyExtAddr( ZDO_UseExtendedPANID, _NIB.extendedPANID );
      zgDefaultStartingScanDuration = BEACON_ORDER_60_MSEC;
      ZDApp_NetworkInit( 0 );
    }
  }
  else
  {
    leave = FALSE;

    // Check if this device needs to leave as a child or descendent
    if ( ind->srcAddr == NLME_GetCoordShortAddr() )
    {
      if ( ( ind->removeChildren == TRUE               ) ||
           ( ZDO_Config_Node_Descriptor.LogicalType ==
             NODETYPE_DEVICE                           )    )
      {
        leave = TRUE;
      }
    }
    else if ( ind->removeChildren == TRUE )
    {
      // Check NWK address allocation algorithm
      //leave = RTG_ANCESTOR(nwkAddr,thisAddr);
    }

    if ( leave == TRUE )
    {
      // Prepare to leave with reset
      ZDApp_LeaveReset( ind->rejoin );
    }
    else
    {
      // Remove device address(optionally descendents) from data
      ZDApp_LeaveUpdate( ind->srcAddr,
                         ind->extAddr,
                         ind->removeChildren );
    }
  }

  // Pass the leave indication to higher layer if callback registered.
  if (zdoCBFunc[ZDO_LEAVE_IND_CBID] != NULL)
  {
    (void)zdoCBFunc[ZDO_LEAVE_IND_CBID](ind);
  }
}

采用join和rejoin对于父设备来说都没问题，不管怎么样，父设备都会去update自己的Association list，而且每次都会当成一个新的设备加入。

对于节点来说就是短地址的问题，如果join的方式新的短地址，rejoin就是原先的地址。