CC2540 如何连续读取characteristic的handle？

在一个服务里面定义了4个char，每个都有read权限，在central代码里测试了下，发现只有第一个跟第三个的char可以读，第二个第四个读不到信息，若循环读取同一个char，则是一次能读到则下一次不能读到，这样看来是无法连续读取两个handle？请问下是否是连续读取时有何讲究或者判断条件有问题？

static void simpleBLEGATTDiscoveryEvent( gattMsgEvent_t *pMsg )
{
  attReadByTypeReq_t req;
  if ( simpleBLEDiscState == BLE_DISC_STATE_SVC )
  {
    // Service found, store handles
    if ( pMsg->method == ATT_FIND_BY_TYPE_VALUE_RSP &&
         pMsg->msg.findByTypeValueRsp.numInfo > 0 )
    {
      simpleBLESvcStartHdl = pMsg->msg.findByTypeValueRsp.handlesInfo[0].handle;
      simpleBLESvcEndHdl = pMsg->msg.findByTypeValueRsp.handlesInfo[0].grpEndHandle;
    }
    
    if ( ( pMsg->method == ATT_FIND_BY_TYPE_VALUE_RSP  && 
           pMsg->hdr.status == bleProcedureComplete ) ||
         ( pMsg->method == ATT_ERROR_RSP ) )
    {
      if ( simpleBLESvcStartHdl != 0 )
      {
        // Discover characteristic
        simpleBLEDiscState = BLE_DISC_STATE_CHAR1;
        
        req.startHandle = simpleBLESvcStartHdl;
        req.endHandle = simpleBLESvcEndHdl;
        req.type.len = ATT_BT_UUID_SIZE;
        req.type.uuid[0] = LO_UINT16(CHAR1_UUID);
        req.type.uuid[1] = HI_UINT16(CHAR1_UUID);

        GATT_ReadUsingCharUUID( simpleBLEConnHandle, &req, simpleBLETaskId );
        LCD_WRITE_STRING( "GATT_Read CHAR1_UUID\r\n", HAL_LCD_LINE_1 );
      }
    }
  }
  
  else if ( simpleBLEDiscState == BLE_DISC_STATE_CHAR1 )
  {
    // Tel number found, store handle
    if ( ( pMsg->method == ATT_READ_BY_TYPE_RSP && 
        pMsg->hdr.status == bleProcedureComplete ) ||
         pMsg->msg.readByTypeRsp.numPairs > 0 )
    {
      if ( simpleBLESvcStartHdl != 0 )
      {
        TelNumCharHdl = BUILD_UINT16( pMsg->msg.readByTypeRsp.dataList[0],
                                     pMsg->msg.readByTypeRsp.dataList[1] );
        
        LCD_WRITE_STRING( "BLE_DISC_STATE_CHAR1 Found:", HAL_LCD_LINE_1 );
        
        simpleBLEDiscState = BLE_DISC_STATE_CHAR2;
        
        req.startHandle = simpleBLESvcStartHdl;
        req.endHandle = simpleBLESvcEndHdl;
        req.type.len = ATT_BT_UUID_SIZE;
        req.type.uuid[0] = LO_UINT16(CHAR2_UUID);
        req.type.uuid[1] = HI_UINT16(CHAR2_UUID);
        
        GATT_ReadUsingCharUUID( simpleBLEConnHandle, &req, simpleBLETaskId );
        LCD_WRITE_STRING( "GATT_Read CHAR2\r\n", HAL_LCD_LINE_1 );
      }
    }
  }
  
  
  else if ( simpleBLEDiscState == BLE_DISC_STATE_CHAR2 )
  {
    if ( ( pMsg->method == ATT_READ_BY_TYPE_RSP && 
        pMsg->hdr.status == bleProcedureComplete ) ||
         pMsg->msg.readByTypeRsp.numPairs > 0 )
    {
      if ( simpleBLESvcStartHdl != 0 )
      {
        TelNumCharHdl = BUILD_UINT16( pMsg->msg.readByTypeRsp.dataList[0],
                                     pMsg->msg.readByTypeRsp.dataList[1] );
        
        LCD_WRITE_STRING( "BLE_DISC_STATE_CHAR2 Found:", HAL_LCD_LINE_1 );
        
        simpleBLEDiscState = BLE_DISC_STATE_CHAR3;
        
        req.startHandle = simpleBLESvcStartHdl;
        req.endHandle = simpleBLESvcEndHdl;
        req.type.len = ATT_BT_UUID_SIZE;
        req.type.uuid[0] = LO_UINT16(CHAR3_UUID);
        req.type.uuid[1] = HI_UINT16(CHAR3_UUID);
        
        GATT_ReadUsingCharUUID( simpleBLEConnHandle, &req, simpleBLETaskId );
        LCD_WRITE_STRING( "GATT_Read CHAR3\r\n", HAL_LCD_LINE_1 );
      }
    }
  }
  
  
  else if ( simpleBLEDiscState == BLE_DISC_STATE_CHAR3 )
  {
    if ( ( pMsg->method == ATT_READ_BY_TYPE_RSP && 
        pMsg->hdr.status == bleProcedureComplete ) ||
         pMsg->msg.readByTypeRsp.numPairs > 0 )
    {
      if ( simpleBLESvcStartHdl != 0 )
      {
        TelNumCharHdl = BUILD_UINT16( pMsg->msg.readByTypeRsp.dataList[0],
                                     pMsg->msg.readByTypeRsp.dataList[1] );
        
        LCD_WRITE_STRING( "BLE_DISC_STATE_CHAR3 Found:", HAL_LCD_LINE_1 );
        
        simpleBLEDiscState = BLE_DISC_STATE_CHAR4;
        
        req.startHandle = simpleBLESvcStartHdl;
        req.endHandle = simpleBLESvcEndHdl;
        req.type.len = ATT_BT_UUID_SIZE;
        req.type.uuid[0] = LO_UINT16(CHAR4_UUID);
        req.type.uuid[1] = HI_UINT16(CHAR4_UUID);
        
        GATT_ReadUsingCharUUID( simpleBLEConnHandle, &req, simpleBLETaskId );
        LCD_WRITE_STRING( "GATT_Read CHAR4\r\n", HAL_LCD_LINE_1 );
      }
    }
  }

  
  else if ( simpleBLEDiscState == BLE_DISC_STATE_CHAR4 )
  {
    // Tel number found, store handle
    if ( ( pMsg->method == ATT_READ_BY_TYPE_RSP && 
        pMsg->hdr.status == bleProcedureComplete ) ||
         pMsg->msg.readByTypeRsp.numPairs > 0 )
    {
      if ( simpleBLESvcStartHdl != 0 )
      {
        TelNumCharHdl = BUILD_UINT16( pMsg->msg.readByTypeRsp.dataList[0],
                                     pMsg->msg.readByTypeRsp.dataList[1] );
        
        LCD_WRITE_STRING( "BLE_DISC_STATE_CHAR4 Found:", HAL_LCD_LINE_1 );
        
      }
    }
    simpleBLEDiscState = BLE_DISC_STATE_IDLE; 
  }
   
}