nordic工程：模拟发送蓝牙广播包和扫描响应包

1 从机广播，主机扫描

从机（外围设备）要被主机连接，那么它就必须先被主机发现。这个时候，从机设备把自身信息以广播形式发射出去。
扫描是一个在一定范围内用来寻址其他低功耗蓝牙设备广播的过程。从机不断发送广播信号给主机 （Observer ），如果手机不开启扫描窗口，主机是收不到设备 的广播的。
observer 为主机观察者，advertiser 就是从机广播。

广播包有两种： 广播包 （Advertising Data）和 响应包 （Scan Response），其中
广播包是每个设备必须广播的，而响应包是可选的。广播响应包（Scan Response）的设置是为了给广播一个额外的 31 字节数据，用于主机为 主动扫描情况下，反馈数据使用

2 蓝牙广播包

nordic的一个广播数据实际上最多可以携带 31 字节的数据。
下面分析一下nordic52832工程样例中的广播初始化：

static void advertising_init(void)
{
    ret_code_t err_code;
	memset(&g_advertisingInit, 0, sizeof(g_advertisingInit));

	// 初始化广播数据包和扫描响应包内容
	InitAdvertisingData(&g_advertisingInit);
	InitScanResponseData(&g_advertisingInit);
	
    g_advertisingInit.config.ble_adv_fast_enabled  = true;							// 广播类型，快速广播		
    g_advertisingInit.config.ble_adv_fast_interval = APP_ADV_INTERVAL;				// 广播间隔
    g_advertisingInit.config.ble_adv_fast_timeout  = APP_ADV_DURATION;				// 广播超时时间，值0则保持一种广播模式不变

    g_advertisingInit.evt_handler = on_adv_evt;

    err_code = ble_advertising_init(&m_advertising, &g_advertisingInit);			// 初始化广播，导入参数
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);			// 设置广播识别号
}
void InitAdvertisingData(ble_advertising_init_t *pInit)
{	
	pInit->advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;		// 蓝牙设备模式，LE普通发现模式和不支持BR/EDR模式
	
	// TIPS:由于Nordic平台差异company_identifier占用了数据内容两字节
	g_advertisingData.company_identifier = 0;																	// 数据包类型
	g_advertisingData.company_identifier = g_advertisingData.company_identifier | (0 << 8);						// 同步时间标识
	
	g_advertisingData.data.p_data = g_advertisingDataEventsAndParamsData;
	g_advertisingData.data.size = 24;
	
	pInit->advdata.p_manuf_specific_data = &g_advertisingData;
}

主要是对 &ble_advdata_t;和&config进行配置；

typedef struct
{
    ble_advdata_name_type_t      name_type;                           /**< Type of device name. */
    uint8_t                      short_name_len;                      /**< Length of short device name (if short type is specified). */
    bool                         include_appearance;                  /**< Determines if Appearance shall be included. */
    uint8_t                      flags;                               /**< Advertising data Flags field. */
    int8_t *                     p_tx_power_level;                    /**< TX Power Level field. */
    ble_advdata_uuid_list_t      uuids_more_available;                /**< List of UUIDs in the 'More Available' list. */
    ble_advdata_uuid_list_t      uuids_complete;                      /**< List of UUIDs in the 'Complete' list. */
    ble_advdata_uuid_list_t      uuids_solicited;                     /**< List of solicited UUIDs. */
    ble_advdata_conn_int_t *     p_slave_conn_int;                    /**< Slave Connection Interval Range. */
    ble_advdata_manuf_data_t *   p_manuf_specific_data;               /**< Manufacturer specific data. */
    ble_advdata_service_data_t * p_service_data_array;                /**< Array of Service data structures. */
    uint8_t                      service_data_count;                  /**< Number of Service data structures. */
    bool                         include_ble_device_addr;             /**< Determines if LE Bluetooth Device Address shall be included. */
    ble_advdata_le_role_t        le_role;                             /**< LE Role field. Included when different from @ref BLE_ADVDATA_ROLE_NOT_PRESENT. @warning This field can be used only for NFC. For BLE advertising, set it to NULL. */
    ble_advdata_tk_value_t *     p_tk_value;                          /**< Security Manager TK value field. Included when different from NULL. @warning This field can be used only for NFC. For BLE advertising, set it to NULL.*/
    uint8_t *                    p_sec_mgr_oob_flags;                 /**< Security Manager Out Of Band Flags field. Included when different from NULL. @warning This field can be used only for NFC. For BLE advertising, set it to NULL.*/
    ble_gap_lesc_oob_data_t *    p_lesc_data;                         /**< LE Secure Connections OOB data. Included when different from NULL. @warning This field can be used only for NFC. For BLE advertising, set it to NULL.*/
} ble_advdata_t;

&advdata 广播数据定义了广播的基本参数，比如名称类型，最短名称长度，
设备模式，发射功率等等，需要什么改什么。

typedef struct
{
    bool     ble_adv_on_disconnect_disabled;     /**< Enable or disable automatic return to advertising upon disconnecting.*/
    bool     ble_adv_whitelist_enabled;          /**< Enable or disable use of the whitelist. */
    bool     ble_adv_directed_high_duty_enabled; /**< Enable or disable high duty direct advertising mode. Can not be used together with extended advertising. */
    bool     ble_adv_directed_enabled;           /**< Enable or disable direct advertising mode. */
    bool     ble_adv_fast_enabled;               /**< Enable or disable fast advertising mode. */
    bool     ble_adv_slow_enabled;               /**< Enable or disable slow advertising mode. */
    uint32_t ble_adv_directed_interval;          /**< Advertising interval for directed advertising. */
    uint32_t ble_adv_directed_timeout;           /**< Time-out (number of tries) for direct advertising. */
    uint32_t ble_adv_fast_interval;              /**< Advertising interval for fast advertising. */
    uint32_t ble_adv_fast_timeout;               /**< Time-out (in units of 10ms) for fast advertising. */
    uint32_t ble_adv_slow_interval;              /**< Advertising interval for slow advertising. */
    uint32_t ble_adv_slow_timeout;               /**< Time-out (in units of 10ms) for slow advertising. */
    bool     ble_adv_extended_enabled;           /**< Enable or disable extended advertising. */
    uint32_t ble_adv_secondary_phy;              /**< PHY for the secondary (extended) advertising @ref BLE_GAP_PHYS (BLE_GAP_PHY_1MBPS, BLE_GAP_PHY_2MBPS or BLE_GAP_PHY_CODED). */
    uint32_t ble_adv_primary_phy;                /**< PHY for the primary advertising. @ref BLE_GAP_PHYS (BLE_GAP_PHY_1MBPS, BLE_GAP_PHY_2MBPS or BLE_GAP_PHY_CODED). */
} ble_adv_modes_config_t;

&config结构体设置了广播的模式配置参数，比如比较多，包括快速广播，慢速广播，定向广播等。
广播数据是放在 ble_advdata_t 下的ble_advdata_manuf_data_t结构体里面

typedef struct
{
    uint16_t                     company_identifier;                  /**< Company identifier code. */
    uint8_array_t                data;                                /**< Additional manufacturer specific data. */
} ble_advdata_manuf_data_t;
typedef struct
{
    uint16_t  size;                 /**< Number of array entries. */
    uint8_t * p_data;               /**< Pointer to array entries. */
} uint8_array_t;

ok，那我们别的配置都先不管，直接写数据拿来用。写一个数组替换掉g_advertisingDataEventsAndParamsData，然后发射出去

void ad_test(void){
	NRF_LOG_INFO("ad_test");
	uint8 test_data[]={0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x68,0x96,0x88,0x69,0x86,0x00,0x00,0x66,0x51,0x15,0x99,0x19,0x96,0x10,0x29};
	g_advertisingData.company_identifier=0x0302;
		g_advertisingData.data.size = 24;
		//g_advertisingData.data.p_data =test_data;
		
	memcpy(g_advertisingDataEventsAndParamsData,test_data,sizeof(test_data));

//EnableAdvertising();
		
}

找一个地方调用test函数，利用UpdataAdvData();更新发送

static void adv_scan_start(void)
{
    ret_code_t err_code;

    //check if there are no flash operations in progress
    if(!nrf_fstorage_is_busy(NULL))
    {
        // Start scanning for peripherals and initiate connection to devices which
        // advertise Heart Rate or Running speed and cadence UUIDs.
//        scan_start();
	//scan_test();
        // Start advertising.
		ad_test();
		UpdataAdvData();
	//	advertising_advdata_update();
//		err_code = ble_advertising_init(&m_advertising, &g_advertisingInit);			// 初始化广播，导入参数
//		APP_ERROR_CHECK(err_code);
//		
//		ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);	
//		
//        err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
//        APP_ERROR_CHECK(err_code);
//		
//		NRF_LOG_INFO("ok");
		
    }
}
 @brief 更新广播内容
 @param 无
 @return 无
*/
void UpdataAdvData(void)
{
	bool eraseBonds = false;
	if(GetBleConnectStatus() == false)
	{
		advertising_stop();
	
		advertising_advdata_update();
	
		advertising_start(eraseBonds);
	}

}
void advertising_advdata_update(void)
{
	ret_code_t err_code;

    err_code = ble_advertising_init(&m_advertising, &g_advertisingInit);			// 初始化广播，导入参数
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);			// 设置广播识别号
}
void advertising_start(bool erase_bonds)
{
    if(erase_bonds == true)
    {
        delete_bonds();
        // Advertising is started by PM_EVT_PEERS_DELETED_SUCEEDED event
    }
    else
    {
        ret_code_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);

        APP_ERROR_CHECK(err_code);
    }
}

UpdataAdvData（）；等效于注释掉那一堆
// err_code = ble_advertising_init(&m_advertising, &g_advertisingInit); // 初始化广播，导入参数
// APP_ERROR_CHECK(err_code);
//
// ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
//
// err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
// APP_ERROR_CHECK(err_code);
来看下广播

3 扫描响应包

当主机接收到广播包后，它可能发送请求更多数据包的请求，称为扫描回应，如果
它被设置成主动扫描，从机设备将会发送一个扫描回应做为对主机请求的回应，扫描回
应最多也可以携带31字节的数据。广播扫描回应包的数据结构类型可以和广播包一致。
跟广播类似

void scan_test(void){

		NRF_LOG_INFO("scan_test");
	uint8 test_data[]={0x00,0x01,0x02,0x02,0x01,0x00,0x00,0x19,0x96,0x10,0x29,0x00,0x00,0x00,0x00,0x00,0x00,0x96,0x069,};

	g_scanResponseData.company_identifier =0x0504;
		g_scanResponseData.data .size=12;
		memcpy(g_scanResponseStatusAndParamsData,test_data,sizeof(test_data));
}

放入在广播相同的adv_scan_start(void)函数内。
这里注意
初始化扫描应答包里面放了广播的名字
pInit->srdata.name_type = BLE_ADVDATA_FULL_NAME;
#define DEVICE_NAME “Mr.Lv’device”
所以剩余的长度没有24个那么多，否则名字不能完全显示出来。

上面是扫描响应数据，下面是名字对应的ASCLL码的值。