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修改simple_peripheral工程的simple_gatt_profile.c文件：

1、工程默认char4为notify，长度为1个字节，我们参考char5把它修改为20个字节。

2、为了使主机能自动获取char4的handle，从而打开notify开关，我们为char4的属性添加一个read 权限

修改后的代码如下，其中 SIMPLEPROFILE_CHAR4_LEN = 20；

// Simple Profile Characteristic 4 Properties
static uint8 simpleProfileChar4Props = GATT_PROP_NOTIFY | GATT_PROP_READ;

// Characteristic 4 Value
//static uint8 simpleProfileChar4 = 0;
static uint8 simpleProfileChar4[SIMPLEPROFILE_CHAR4_LEN] = { 0, 0, 0, 0, 0 };

// Simple Profile Characteristic 4 Configuration Each client has its own
// instantiation of the Client Characteristic Configuration. Reads of the
// Client Characteristic Configuration only shows the configuration for
// that client and writes only affect the configuration of that client.
static gattCharCfg_t *simpleProfileChar4Config;

// Simple Profile Characteristic 4 User Description
static uint8 simpleProfileChar4UserDesp[17] = "Characteristic 4";

3、修改 数组 simpleProfileAttrTbl[]：

static gattAttribute_t simpleProfileAttrTbl[SERVAPP_NUM_ATTR_SUPPORTED] =
{
    //。。。
    // Characteristic 3 

    // Characteristic 4 Declaration
    {
      { ATT_BT_UUID_SIZE, characterUUID },
      GATT_PERMIT_READ,
      0,
      &simpleProfileChar4Props
    },

      // Characteristic Value 4
      {
        { ATT_BT_UUID_SIZE, simpleProfilechar4UUID },
        GATT_PERMIT_READ,//0
        0,
        simpleProfileChar4
      },

      // Characteristic 4 configuration
      {
        { ATT_BT_UUID_SIZE, clientCharCfgUUID },
        GATT_PERMIT_READ | GATT_PERMIT_WRITE,
        0,
        (uint8 *)&simpleProfileChar4Config
      },

      // Characteristic 4 User Description
      {
        { ATT_BT_UUID_SIZE, charUserDescUUID },
        GATT_PERMIT_READ,
        0,
        simpleProfileChar4UserDesp
      },

    // Characteristic 5 Declaration
     。。。
};

4、修改函数SimpleProfile_SetParameter( )

bStatus_t SimpleProfile_SetParameter( uint8 param, uint8 len, void *value )
{
    //。。。
    case SIMPLEPROFILE_CHAR4:
     if ( 1 )//len <= 20)    
     {
          VOID memcpy( simpleProfileChar4, value, len );
        // See if Notification has been enabled
        GATTServApp_ProcessCharCfg( simpleProfileChar4Config, simpleProfileChar4, FALSE,
                           simpleProfileAttrTbl, GATT_NUM_ATTRS( simpleProfileAttrTbl ),
                           INVALID_TASK_ID, simpleProfile_ReadAttrCB );
      }
      else
      {
        ret = bleInvalidRange;
      }
      break;
     //。。。
}

5、修改函数SimpleProfile_GetParameter( )

bStatus_t SimpleProfile_GetParameter( uint8 param, void *value )
{
    //。。。
    case SIMPLEPROFILE_CHAR4:
        VOID memcpy( value, simpleProfileChar4, SIMPLEPROFILE_CHAR4_LEN );
      break;
    //。。。
}

6、修改函数simpleProfile_ReadAttrCB( )

static bStatus_t simpleProfile_ReadAttrCB(uint16_t connHandle,
                                          gattAttribute_t *pAttr,
                                          uint8_t *pValue, uint16_t *pLen,
                                          uint16_t offset, uint16_t maxLen,
                                          uint8_t method)
{
    //。。。
      case SIMPLEPROFILE_CHAR1_UUID:
      case SIMPLEPROFILE_CHAR2_UUID:
      case SIMPLEPROFILE_CHAR4_UUID:
          *pLen = SIMPLEPROFILE_CHAR4_LEN;
          VOID memcpy( pValue, pAttr->pValue, SIMPLEPROFILE_CHAR4_LEN );
        break;
    //。。。

}

7、最后添加最重要的函数 NotifyByChar4(),其中通过simpleProfileChar4Config获取连ConnHandle，通过simpleProfileAttrTbl[]获取notify句柄。

void NotifyByChar4(uint8 *pBuffer,uint16 length)
{
    attHandleValueNoti_t noti;
    bStatus_t status;
    gattCharCfg_t *pItem = simpleProfileChar4Config;
    if  ( pItem->connHandle != INVALID_CONNHANDLE )
    {
        noti.pValue =  (uint8 *)GATT_bm_alloc( pItem->connHandle, ATT_HANDLE_VALUE_NOTI,length,&length);

        if (noti.pValue != NULL)
        {
            //simpleProfileAttrTbl[11]为Char4 Value对应的数组
            noti.handle =  simpleProfileAttrTbl[11].handle;   
            noti.len = length;
            memcpy(noti.pValue, pBuffer, length);

            status = GATT_Notification( pItem->connHandle, &noti, FALSE );

            if ( status != SUCCESS )
            {
                GATT_bm_free( (gattMsg_t *)&noti, ATT_HANDLE_VALUE_NOTI );
            }
        }
        else
        {
            GATT_bm_free( (gattMsg_t *)&noti, ATT_HANDLE_VALUE_NOTI );
            status = bleNoResources;
        }
    }
}