用户数据

Hi Ruchi Patel

Please check the ble_app_barebone example of the SDK which demonstrates dynamically change of user advertising data. Yes, you can send more than 1 advertisement packets with different payloads. The ble_app_barebone example demonstrates that functionality, too. The advertising string should have a specific format, like . The blocks of code that you have posted have this format, so it is possible to do that. The advertisement packet transmission rate can be customized in the user_undirected_advertise_conf structure of
user_config.h file. The advertising packets are transmitted in specific advertising intervals which can be changed in that structure

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Hi Ruchi Patel,

You can configure the advertisement packet transmission rate by changing the .intv_min or .intv_max menbers of user_adv_conf structure, which is defined in user_config.h. In this way, you can define the minimum and maximum intervals for advertising. Regarding the advertising data, you are able to modify not only the manufacturing advertising data. Also you able to modify more than 1 bytes of advertising data. The ble_app_barebone example of the SDK changes the propriety data of the advertising string dynamically. The propriety data have 2 bytes length in the specific example, but the length of them can be changed. In the advertising string you can append your specific data and update them from your application. The advertising message is created in app_easy_gap_undirected_advertise_start_create_msg() function and then is saved in the cmd structure when the app_easy_gap_undirected_advertise_get_active() function is invoked. The cmd pointer will have a full message that you can send to the stack including some default adv data taken from the USER_ADVERTISE_DATA, so what you can do is after the app_easy_gap_undirected_advertise_get_active() returns, target the array in the cmd pointer that holds the advertising data (cmd->info.host.adv_data) and change them as you like – your data will have to be according to the BLE specification.

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Hi Ruchi Patel,

关于NMI\u处理程序，它独立于您的双角色应用程序。由于看门狗计时器的原因，将发出NMI\ U处理程序。请检查您的应用程序中的监视器。关于广播和观察者模式之间的切换，您不应该做任何额外的更改。在广播的情况下，你是作为一个不可连接的设备广告？如果没有，您可以使用app\u easy\u gap\u non\u connectable\u adversed\u start API为非连接广告创建广告消息。另外，我建议您在广告发布完成时使用.app \u on \u adv \u noncon \u complete回调函数，因为作为不可连接的设备发布广告时会触发此回调。

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Hi Ruchi Pate,

当您在帖子中说，#define“user_advertise_data”附加到.nvds_tag_app_ble_adv_data项目的nvds_data_storage结构。您可以定义多个User_Advertise_Data，但由于唯一的.nvds_tag_app_ble_adv_data项，只能在该结构中附加其中一个。如果您想要拥有多个广告数据，您可以使用不同的方式进行。我建议您将user_advertise_data定义为空，然后动态地附加不同的广告数据。当设备启动广告时，执行user_App_Adv_Start（），然后通过app_easy_gap_undirected_advertise_get_active（）创建CMD。app_easy_gap_undircated_advertise_get_active（）函数返回app_easy_gap_undircated_advertise_start_create_msg（）函数，为可连接的无向事件创建广告消息。广告消息包括用户广告配置，广告数据和其他数据。app_easy_gap_adv_read_from_nvds（）函数从nvds_data_storage结构中读取user_advertise_data，因此如果您有空的user_advertise_data定义，则您的广告数据将为空。通过这种方式，您可以根据user_app_add_start（）函数中的app_add_ad_struct（）动态地追加不同的广告数据。

Regarding the manufacturer data, when the device is in observer mode, the .app_on_adv_report_ind ind callback function (in user_callback_config.h file) will executed, so it shouldn’t be NULL and you should define a function to be triggered. When a GAPM_ADV_REPORT_IND is received, the gapm_adv_report_ind_handler() will executed which is executes the .app_on_adv_report_ind ind callback. This handler has input parameter the gapm_adv_report_ind structure, which includes the adv_report structure. The manufacturer data should be at the data[ADV_DATA_LEN] item of the adv_report scucture. So how do you actually check that the manufacturer data are not being received and all the other data received properly?

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Hi Ruchi Patel,

Depending how you are using the SDK and which example you are using be aware that the SDK will append any extra data that don’t fit in the advertising string in the scan response data, so make sure that the data that you are interested in is in the advertising string and not the scan response data. In the first indication (advertising indication) the advertising data will populate the data member of the adv_report struct, and then in the second indication (scan response indication) the scan response data will populate the struct. In order to catch the scan response data, you should configure your device as GAPM_SCAN_ACTIVE to get a scan response. If you configure your device as GAPM_SCAN_PASSIVE, the observer only receives advertising data and doesn’t send a scan request to receive a scan response, so you will not able to read your scan response data. I’ve also tested this using an observer and the ble_app_barebone, I was able to get the increment in the advertising string or in the scan response data.

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Hi Ruchi Patel,

As I have pointed out in a previous post, you are not able to define more than one USER_ADVERTISE_DATA, because the #define “USER_ADVERTISE_DATA” is appended into the .NVDS_TAG_APP_BLE_ADV_DATA item of nvds_data_storage structure. The advertising string has 31 byte length, but 3 bytes of them are reserved from the stack, the advertising filter policy and the advertising data length, so you are able to use up to 28bytes. The data that are appended into the advertising string will be populated by user_app_adv_start with the procedure I have already mentioned in a previous post. In case you want to add your custom data into the advertising string you should copy them into the correct array of the cmd which is into user_app_adv_start() function. The cmd is created by app_easy_gap_undirected_advertise_get_active(). In your application you can have the USER_ADVERTISE_DATA empty and copy your data into the advertising string. The custom data should be valid and should follow the structure of USER_ADVERTISE_DATA, as in order to start advertising correctly. You should have 2bytes as length and flag into your data, so finally you are able to append up to 26bytes into the advertising string. In the following code, I will present you how you can do that.

void user_app_adv_start（void）
{

uint8_t advdata[28] = {0x1B,0xFF,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38};

// Schedule the next advertising data update
app_adv_data_update_timer_used = app_easy_timer(APP_ADV_DATA_UPDATE_TO, adv_data_update_timer_cb);

struct gapm_start_advertise_cmd * cmd;
cmd = app_easy_gap_undirected_advertise_get_active（）;

memcpy（cmd-> info.host.adv_data，Advdata，28）;

// add manufacturer specific data dynamically
// mnf_data_update（）;
app_add_ad_struct(cmd, &mnf_data, sizeof(struct mnf_specific_data_ad_structure));

app_easy_gap_undirected_advertise_start();
}

If you add 26bytes data into the advertising string and you want to populate additional data, you can append them into scan response data, but in the other side, the observer should be configured as GAPM_SCAN_ACTIVE in order to send the scan request.

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