c - CC253x 固件的非标准 ZCL 封装支持

Question

我的问题是:

Livolo 开关有自己的 Zigbee 门。我想用 CC2531 USB 加密狗从 zigbee2mqtt 连接它们。通常它可以工作，但是当我打开/关闭开关按钮(在物理设备上)时，开关发送了不正确的 ZCL 包。

我绝对是微 Controller 编程和 Zigbee 架构方面的新手。所以我希望有人能帮助我并回答这些问题:

• 我在哪里可以拦截那个格式错误的包？
• 如何修复该软件包以支持 Zigbee 标准？

我使用 Z-STACK-HOME 1.2.2a 固件并按照此处所述进行编译: https://github.com/Koenkk/Z-Stack-firmware/blob/master/coordinator/Z-Stack_Home_1.2/COMPILE.md

// Malformed ZCL package
// header    
0x7c, // [0111 1100]
      // 01 - frame type = "Command is specific or local to a cluster"
      // 1 - manufacturer spec = manufacturer code present
      // 1 - direction = "from server to client"
      // 1 - disable default response 
      // 100 - reserved

0xd2, 0x15, // manufacturer  
0xd8, // sequence  
0x00, // read attrs command

// endpoint adress 
0x12, 0x0f, 0x05, 0x18, 0x00, 0x4b, 0x12, 0x00, 

0x22, 0x00, // ????? need more data from another switches

0x03 // 0x00|0x01|0x02|0x03 - switch state

更新:我认为，我可以在 afIncomingData 函数中拦截 AF.c 文件中的消息并在 afBuildMSGIncoming 中修复。

所以现在我希望有人可以帮助我确定正确的消息格式。可以处理标准 ZCL parcer。

void afIncomingData( aps_FrameFormat_t *aff, zAddrType_t *SrcAddress, uint16 SrcPanId,
                     NLDE_Signal_t *sig, uint8 nwkSeqNum, uint8 SecurityUse,
                     uint32 timestamp, uint8 radius )
{
  endPointDesc_t *epDesc = NULL;
  epList_t *pList = epList;
#if !defined ( APS_NO_GROUPS )
  uint8 grpEp = APS_GROUPS_EP_NOT_FOUND;
#endif

  if ( ((aff->FrmCtrl & APS_DELIVERYMODE_MASK) == APS_FC_DM_GROUP) )
  {
#if !defined ( APS_NO_GROUPS )
    // Find the first endpoint for this group
    grpEp = aps_FindGroupForEndpoint( aff->GroupID, APS_GROUPS_FIND_FIRST );
    if ( grpEp == APS_GROUPS_EP_NOT_FOUND ) {
      // No endpoint found, default to endpoint 1.
      // In the original source code there is a return here. 
      // This prevent the messags from being forwarded.
      // For our use-case we want to capture all messages. 
      // Even if the coordinator is not in the group.
      epDesc = afFindEndPointDesc( 1 );
    }
    else {
      epDesc = afFindEndPointDesc( grpEp );
    }

    if ( epDesc == NULL )
      return;   // Endpoint descriptor not found

    pList = afFindEndPointDescList( epDesc->endPoint );
#else
    return; // Not supported
#endif
  }
  else if ( aff->DstEndPoint == AF_BROADCAST_ENDPOINT )
  {
    // Set the list
    if ( pList != NULL )
    {
      epDesc = pList->epDesc;
    }
  }
  else if ( aff->DstEndPoint == 10 || aff->DstEndPoint == 11 ) {
    if ( (epDesc = afFindEndPointDesc( 1 )) )
    {
      pList = afFindEndPointDescList( epDesc->endPoint );
    }
  }
  else if ( (epDesc = afFindEndPointDesc( aff->DstEndPoint )) )
  {
    pList = afFindEndPointDescList( epDesc->endPoint );
  }

  while ( epDesc )
  {
    uint16 epProfileID = 0xFFFE;  // Invalid Profile ID

    if ( pList->pfnDescCB )
    {
      uint16 *pID = (uint16 *)(pList->pfnDescCB(
                                 AF_DESCRIPTOR_PROFILE_ID, epDesc->endPoint ));
      if ( pID )
      {
        epProfileID = *pID;
        osal_mem_free( pID );
      }
    }
    else if ( epDesc->simpleDesc )
    {
      epProfileID = epDesc->simpleDesc->AppProfId;
    }

    // First part of verification is to make sure that:
    // the local Endpoint ProfileID matches the received ProfileID OR
    // the message is specifically send to ZDO (this excludes the broadcast endpoint) OR
    // if the Wildcard ProfileID is received the message should not be sent to ZDO endpoint
    if ( (aff->ProfileID == epProfileID) ||
         ((epDesc->endPoint == ZDO_EP) && (aff->ProfileID == ZDO_PROFILE_ID)) ||
         ((epDesc->endPoint != ZDO_EP) && ( aff->ProfileID == ZDO_WILDCARD_PROFILE_ID )) )
    {
      // Save original endpoint
      uint8 endpoint = aff->DstEndPoint;

      // overwrite with descriptor's endpoint
      aff->DstEndPoint = epDesc->endPoint;

      afBuildMSGIncoming( aff, epDesc, SrcAddress, SrcPanId, sig,
                         nwkSeqNum, SecurityUse, timestamp, radius );

      // Restore with original endpoint
      aff->DstEndPoint = endpoint;
    }

    if ( ((aff->FrmCtrl & APS_DELIVERYMODE_MASK) == APS_FC_DM_GROUP) )
    {
#if !defined ( APS_NO_GROUPS )
      // Find the next endpoint for this group
      grpEp = aps_FindGroupForEndpoint( aff->GroupID, grpEp );
      if ( grpEp == APS_GROUPS_EP_NOT_FOUND )
        return;   // No endpoint found

      epDesc = afFindEndPointDesc( grpEp );
      if ( epDesc == NULL )
        return;   // Endpoint descriptor not found

      pList = afFindEndPointDescList( epDesc->endPoint );
#else
      return;
#endif
    }
    else if ( aff->DstEndPoint == AF_BROADCAST_ENDPOINT )
    {
      pList = pList->nextDesc;
      if ( pList )
        epDesc = pList->epDesc;
      else
        epDesc = NULL;
    }
    else
      epDesc = NULL;
  }
}

static void afBuildMSGIncoming( aps_FrameFormat_t *aff, endPointDesc_t *epDesc,
                 zAddrType_t *SrcAddress, uint16 SrcPanId, NLDE_Signal_t *sig,
                 uint8 nwkSeqNum, uint8 SecurityUse, uint32 timestamp, uint8 radius )
{
  afIncomingMSGPacket_t *MSGpkt;
  const uint8 len = sizeof( afIncomingMSGPacket_t ) + aff->asduLength;
  uint8 *asdu = aff->asdu;
  MSGpkt = (afIncomingMSGPacket_t *)osal_msg_allocate( len );

  if ( MSGpkt == NULL )
  {
    return;
  }

  MSGpkt->hdr.event = AF_INCOMING_MSG_CMD;
  MSGpkt->groupId = aff->GroupID;
  MSGpkt->clusterId = aff->ClusterID;
  afCopyAddress( &MSGpkt->srcAddr, SrcAddress );
  MSGpkt->srcAddr.endPoint = aff->SrcEndPoint;
  MSGpkt->endPoint = epDesc->endPoint;
  MSGpkt->wasBroadcast = aff->wasBroadcast;
  MSGpkt->LinkQuality = sig->LinkQuality;
  MSGpkt->correlation = sig->correlation;
  MSGpkt->rssi = sig->rssi;
  MSGpkt->SecurityUse = SecurityUse;
  MSGpkt->timestamp = timestamp;
  MSGpkt->nwkSeqNum = nwkSeqNum;
  MSGpkt->macSrcAddr = aff->macSrcAddr;
  MSGpkt->macDestAddr = aff->macDestAddr;
  MSGpkt->srcAddr.panId = SrcPanId;
  MSGpkt->cmd.TransSeqNumber = 0;
  MSGpkt->cmd.DataLength = aff->asduLength;
  MSGpkt->radius = radius;

  if ( MSGpkt->cmd.DataLength )
  {
    MSGpkt->cmd.Data = (uint8 *)(MSGpkt + 1);
    osal_memcpy( MSGpkt->cmd.Data, asdu, MSGpkt->cmd.DataLength );
  }
  else
  {
    MSGpkt->cmd.Data = NULL;
  }

#if defined ( MT_AF_CB_FUNC )
  // If ZDO or SAPI have registered for this endpoint, dont intercept it here
  if (AFCB_CHECK(CB_ID_AF_DATA_IND, *(epDesc->task_id)))
  {
    MT_AfIncomingMsg( (void *)MSGpkt );
    // Release the memory.
    osal_msg_deallocate( (void *)MSGpkt );
  }
  else
#endif
  {
    // Send message through task message.
    osal_msg_send( *(epDesc->task_id), (uint8 *)MSGpkt );
  }
}

Answer 1

我认为您没有正确解码帧控制字节。查看我编写的一些代码，我将其解释如下:

0x7c, // [0111 1100]
      // 011 - reserved
      // 1 - disable default response 
      // 1 - direction = "from server to client"
      // 1 - manufacturer spec = manufacturer code present
      // 00 - frame type = "Command acts across entire profile"

这是基于旧的 ZCL 规范(大约 2008 年？)，也许保留位在规范的更高版本中具有某种意义。

我相信制造商特定位表明这不是标准 Zigbee 命令(读取属性)。如果它是读取属性，我认为它后面应该有偶数个字节(16 位属性 ID)。

该帧的源端点和目标端点、配置文件 ID 和集群 ID 是什么？

更新:看起来你可以修改 afIncomingData() 来查看 aff 的字段来识别这个确切的消息类型(帧控制、端点、集群、配置文件)，然后手它交给您自己的函数进行处理(并在必要时做出响应)。

但我还会查看有关 MT_AF_CB_FUNC 和 MT_AfIncomingMsg() 的文档，看看这是否是识别您要处理的帧的“官方”方式在您自己的代码中。