diff --git a/include/zdatachannel_service.h b/include/zdatachannel_service.h
index 99ab4f2..465ec65 100644
--- a/include/zdatachannel_service.h
+++ b/include/zdatachannel_service.h
@@ -65,7 +65,7 @@ struct zdatachannel_s {
   uint16_t                    service_handle;       /**< Handle of Nordic UART Service (as provided by the SoftDevice). */
   ble_gatts_char_handles_t    cmd_tx_handles;       /**< 指令发送句柄 */
   ble_gatts_char_handles_t    cmd_rx_handles;       /**< 指令接收句柄 */
-  ble_gatts_char_handles_t    datablock_tx_handles; /**< 数据块发送句柄 */
+  // ble_gatts_char_handles_t    datablock_tx_handles; /**< 数据块发送句柄 */
   zdatachannel_data_handler_t data_handler;         /**< Event handler to be called for handling received data. */
 
   // 状态
@@ -83,9 +83,9 @@ static inline uint32_t zdatachannel_data_send2(uint8_t* p_data, uint16_t p_lengt
   return zdatachannel_data_send(p_data, &p_length);
 }
 uint32_t zdatachannel_block_data_send(uint8_t* p_data, uint16_t* p_length);
-static inline uint32_t zdatachannel_block_data_send2(uint8_t* p_data, uint16_t p_length){
-  return zdatachannel_block_data_send(p_data, &p_length);
-}
+// static inline uint32_t zdatachannel_block_data_send2(uint8_t* p_data, uint16_t p_length){
+//   return zdatachannel_block_data_send(p_data, &p_length);
+// }
 
 uint32_t zdatachannel_last_rx_data_haspassed_s();
 
diff --git a/src/zdatachannel_service.c b/src/zdatachannel_service.c
index d19f583..a2e520b 100644
--- a/src/zdatachannel_service.c
+++ b/src/zdatachannel_service.c
@@ -9,11 +9,11 @@
 #define ZDATACHANNEL_UUID_NUS_SERVICE            0x0001 /**< The UUID of the Nordic UART Service. */
 #define ZDATACHANNEL_TX_CHARACTERISTIC           0x0003 /**< The UUID of the TX Characteristic. */
 #define ZDATACHANNEL_RX_CHARACTERISTIC           0x0002 /**< The UUID of the RX Characteristic. */
-#define ZDATACHANNEL_DATABLOCK_TX_CHARACTERISTIC 0x0004 /**< The UUID of the RX Characteristic. */
+// #define ZDATACHANNEL_DATABLOCK_TX_CHARACTERISTIC 0x0004 /**< The UUID of the RX Characteristic. */
 
 #define ZDATACHANNEL_MAX_RX_CHAR_LEN       ZDATACHANNEL_MAX_DATA_LEN /**< Maximum length of the RX Characteristic (in bytes). */
 #define ZDATACHANNEL_MAX_TX_CHAR_LEN       ZDATACHANNEL_MAX_DATA_LEN /**< Maximum length of the TX Characteristic (in bytes). */
-#define ZDATACHANNEL_DATABLOCK_TX_CHAR_LEN ZDATACHANNEL_MAX_DATA_LEN /**< Maximum length of the TX Characteristic (in bytes). */
+// #define ZDATACHANNEL_DATABLOCK_TX_CHAR_LEN ZDATACHANNEL_MAX_DATA_LEN /**< Maximum length of the TX Characteristic (in bytes). */
 
 #define NUS_BASE_UUID                                                                                  \
   {                                                                                                    \
@@ -57,13 +57,16 @@ static void on_write(zdatachannel_t *p_nus, ble_evt_t const *p_ble_evt) {
     } else {
       p_nus->cmd_tx_channel_is_notification_enabled = false;
     }
-  } else if ((p_evt_write->handle == p_nus->datablock_tx_handles.cccd_handle) && (p_evt_write->len == 2)) {
-    if (ble_srv_is_notification_enabled(p_evt_write->data)) {
-      p_nus->datablock_tx_channel_is_notification_enabled = true;
-    } else {
-      p_nus->datablock_tx_channel_is_notification_enabled = false;
-    }
-  } else if ((p_evt_write->handle == p_nus->cmd_rx_handles.value_handle) && (p_nus->data_handler != NULL)) {
+  }
+  //  else if ((p_evt_write->handle == p_nus->datablock_tx_handles.cccd_handle) && (p_evt_write->len == 2)) {
+  //   if (ble_srv_is_notification_enabled(p_evt_write->data)) {
+  //     p_nus->datablock_tx_channel_is_notification_enabled = true;
+  //   } else {
+  //     p_nus->datablock_tx_channel_is_notification_enabled = false;
+  //   }
+  // } 
+  
+  else if ((p_evt_write->handle == p_nus->cmd_rx_handles.value_handle) && (p_nus->data_handler != NULL)) {
     evt.type                  = ZDATACHANNEL_EVT_RX_DATA;
     evt.params.rx_data.p_data = p_evt_write->data;
     evt.params.rx_data.length = p_evt_write->len;
@@ -165,21 +168,21 @@ uint32_t zdatachannel_init(zdatachannel_t *p_nus, zdatachannel_init_t const *p_n
 
   VERIFY_SUCCESS(characteristic_add(p_nus->service_handle, &add_char_params, &p_nus->cmd_tx_handles));
 
-  // Add the TX Characteristic.
-  /**@snippet [Adding proprietary characteristic to the SoftDevice] */
-  memset(&add_char_params, 0, sizeof(add_char_params));
-  add_char_params.uuid              = ZDATACHANNEL_DATABLOCK_TX_CHARACTERISTIC;
-  add_char_params.uuid_type         = p_nus->uuid_type;
-  add_char_params.max_len           = ZDATACHANNEL_DATABLOCK_TX_CHAR_LEN;
-  add_char_params.init_len          = sizeof(uint8_t);
-  add_char_params.is_var_len        = true;
-  add_char_params.char_props.notify = 1;
+  // // Add the TX Characteristic.
+  // /**@snippet [Adding proprietary characteristic to the SoftDevice] */
+  // memset(&add_char_params, 0, sizeof(add_char_params));
+  // add_char_params.uuid              = ZDATACHANNEL_DATABLOCK_TX_CHARACTERISTIC;
+  // add_char_params.uuid_type         = p_nus->uuid_type;
+  // add_char_params.max_len           = ZDATACHANNEL_DATABLOCK_TX_CHAR_LEN;
+  // add_char_params.init_len          = sizeof(uint8_t);
+  // add_char_params.is_var_len        = true;
+  // add_char_params.char_props.notify = 1;
 
-  add_char_params.read_access       = SEC_OPEN;
-  add_char_params.write_access      = SEC_OPEN;
-  add_char_params.cccd_write_access = SEC_OPEN;
+  // add_char_params.read_access       = SEC_OPEN;
+  // add_char_params.write_access      = SEC_OPEN;
+  // add_char_params.cccd_write_access = SEC_OPEN;
 
-  VERIFY_SUCCESS(characteristic_add(p_nus->service_handle, &add_char_params, &p_nus->datablock_tx_handles));
+  // VERIFY_SUCCESS(characteristic_add(p_nus->service_handle, &add_char_params, &p_nus->datablock_tx_handles));
 
   return NRF_SUCCESS;
   /**@snippet [Adding proprietary characteristic to the SoftDevice] */
@@ -210,25 +213,25 @@ uint32_t zdatachannel_data_send(uint8_t *p_data, uint16_t *p_length) {
   return sd_ble_gatts_hvx(p_datachannel->conn_handle, &hvx_params);
 }
 
-uint32_t zdatachannel_block_data_send(uint8_t *p_data, uint16_t *p_length) {
-  ble_gatts_hvx_params_t hvx_params;
+// uint32_t zdatachannel_block_data_send(uint8_t *p_data, uint16_t *p_length) {
+//   ble_gatts_hvx_params_t hvx_params;
 
-  if (!p_datachannel->datablock_tx_channel_is_notification_enabled) {
-    return NRF_ERROR_INVALID_STATE;
-  }
+//   if (!p_datachannel->datablock_tx_channel_is_notification_enabled) {
+//     return NRF_ERROR_INVALID_STATE;
+//   }
 
-  if (*p_length > ZDATACHANNEL_MAX_DATA_LEN) {
-    return NRF_ERROR_INVALID_PARAM;
-  }
-  memset(&hvx_params, 0, sizeof(hvx_params));
+//   if (*p_length > ZDATACHANNEL_MAX_DATA_LEN) {
+//     return NRF_ERROR_INVALID_PARAM;
+//   }
+//   memset(&hvx_params, 0, sizeof(hvx_params));
 
-  hvx_params.handle = p_datachannel->datablock_tx_handles.value_handle;
-  hvx_params.p_data = p_data;
-  hvx_params.p_len  = p_length;
-  hvx_params.type   = BLE_GATT_HVX_NOTIFICATION;
+//   hvx_params.handle = p_datachannel->datablock_tx_handles.value_handle;
+//   hvx_params.p_data = p_data;
+//   hvx_params.p_len  = p_length;
+//   hvx_params.type   = BLE_GATT_HVX_NOTIFICATION;
 
-  return sd_ble_gatts_hvx(p_datachannel->conn_handle, &hvx_params);
-}
+//   return sd_ble_gatts_hvx(p_datachannel->conn_handle, &hvx_params);
+// }
 
 uint32_t zdatachannel_last_rx_data_haspassed_s() {  //
   uint32_t now = znordic_getpower_on_s();