如何发送ATT错误响应

是的，您应该使用CyBygGATSerRoRSP（）。CyLygGATSWrreServer（）只在希望写入成功/响应时发送。
CyByLyGATSerRoRSP（）的文档/注释应该解释如何很好地使用它：
/ *****************************************************************************************************************************************************************
*函数名称：CyBLY-GATSerSerRRP
************************************************************************************************************************************************************************************************************************************************************
*
*此函数向对等设备发送错误响应。误差响应
*用于声明给定的请求无法执行，并提供
*“CyBLY-GATHEGETRYL CODET”中定义的原因。这是一个非阻塞函数。
*
*注意GATT客户端启动的“写入命令”不会生成
*来自GATT服务器端的“错误响应”。关贸总协定客户得到
＊CyLay-EvtgGATCKErrRoRyrSP事件接收错误响应。
*
*参阅蓝牙4.1核心规范，第3卷，第F部分，第3.4.1.1节
*关于错误响应操作的更多细节。
*
*PARAM CONTRAWER：标识对等GATT实体类型的连接句柄
＊CysLy-Couth-Hand
*PARAM ErrSPPARAM:指向CyBLY-GATSFSRelyPARAMAMT结构的指针。
*
*返回
*CyByrApIILReultTyt：返回值指示函数是否成功或
*失败。下面是可能的错误代码。
*
＊错误代码描述
* ------------------
＊成功手术
* CyByLyRoRySimuldId参数'CualHuff'值不表示堆栈中的任何现有条目
*不允许此操作
* CyByrErrRoReMyMyLogyApLosial1内存分配失败
*
***
TL；DR；
按照你的要求去做：
在外围调用CyLabyGATSerRoRSP（）
在中央处理CyByLyEvtgGATCyErrRoRyrSP事件
对于中心上的事件和外围的响应函数，错误都应该封装在CyByrgGassHeel-PARAMGLT结构中。



     以下为原文
  Yes, you should use CyBle_GattsErrorRsp(). CyBle_GattsWriteRsp() is only called when you want the write to succeed/response to be sent as okay.
 
The documentation/comments for the CyBle_GattsErrorRsp() should explain how to use it pretty well:
/******************************************************************************
* Function Name: CyBle_GattsErrorRsp
***************************************************************************//**
*
*  This function sends an error response to the peer device. The Error Response
*  is used to state that a given request cannot be performed, and to provide the
*  reason as defined in 'CYBLE_GATT_ERR_CODE_T'. This is a non-blocking function.
*
*  Note that the 'Write Command' initiated by GATT Client does not generate an
*  'Error Response' from the GATT Server's end. The GATT Client gets
*  CYBLE_EVT_GATTC_ERROR_RSP event on receiving error response.
*
*  Refer Bluetooth 4.1 core specification, Volume 3, Part F, section 3.4.1.1 for
*  more details on Error Response operation.
* 
*  param connHandle: Connection handle to identify the peer GATT entity, of type
*               CYBLE_CONN_HANDLE_T.
*  param errRspParam: Pointer to structure of type CYBLE_GATTS_ERR_PARAM_T.
*
* return
*  CYBLE_API_RESULT_T : Return value indicates if the function succeeded or
*  failed. Following are the possible error codes.
*
*  Errors codes                          | Description
*  ------------                          | -----------
*   CYBLE_ERROR_OK                       | On successful operation
*   CYBLE_ERROR_INVALID_PARAMETER        | 'connHandle' value does not represent any existing entry in the Stack
*   CYBLE_ERROR_INVALID_OPERATION        | This operation is not permitted
*   CYBLE_ERROR_MEMORY_ALLOCATION_FAILED | Memory allocation failed
*
******************************************************************************/
 
Tl;Dr;
To do what you are asking:
Call CyBle_GattsErrorRsp() on the peripheral
Handle the CYBLE_EVT_GATTC_ERROR_RSP event on the central
The error should be packaged within the CYBLE_GATTS_ERR_PARAM_T structure for both the event on the central and the response function on the peripheral.