修改广告数据包

Hi,

You are fully right.

Here are the answers to your question:

How to dynamically change the advertising data?

首先，必须停止BLE收音机，然后可以更新ADV数据。

The KERNEL timer must be used to update the advertising string after a certain time .
Example of KERNEL timer function: app_timer_set(APP_ADV_TIMER, TASK_APP, 300);
function which has to be called in the app_adv_func ().

Once the time has elapsed, a GAPM_CANCEL message has to be sent to the KERNEL.
This is going to cancel the ongoing activities before advertising the new parameters.
This is done by calling the app_adv_stop () in the BLE timer handler.

广告明星t again
In the gapm_cmp_evt_handler (), case GAPM_ADV_NON_CONN, the function app_adv_start() must be called to start advertising again.

问候，

DIALOG TEAM.

Hi,

I also try to Modifying advertising data package (sequence number) every advertising message ,
from the explanation above I can't understand what to do ?

setting app_timer_set(APP_ADV_TIMER, TASK_APP, 300); at the app_adv_func (). Once the time has elapsed the app_adv_timer_handler(..) function is start ,
and setting again app_adv_start() at gapm_cmp_evt_handler(), case case GAPM_ADV_UNDIRECT endless loop.

问候，
Tzvika

Hi, Dialog team,

所以，没有*回拨*类型函数可用于在BLE堆栈将要发送新数据包之前更改ADV数据包，对吧？

嗨Hardy.chen，

You mean a callback function that will be called after completing the sending of one advertising packet? No, there is no such a callback. If you want to implement this kind of functionallity check the beacon reference design in the app_sleep.h file in app_async_trm() function maybe this will help. Only thecompletetion提供广告操作的回调。

Thanks MT_dialog

Hi MT_dialog,

Is there any document for explaining the event reported from app_last_rwble_evt_get?
i.e. when will the event BLE_EVT_END be available? *every* ADV packet being sent? or termination of BLE connection? or every packet of connection PDU?

Hi Hardy.chen,

Please refer also to your other post,http://support.dialog-semiconductor.com/please-explain-last-ble-event-enum. The BLE_EVT_END will be available when a Transmition is over, meaning at the ending of each BLE event, you will get one BLE_EVT_END for every advertising event completed and for every connection interval completed.

Thanks MT_dialog

Hi Dialog team,

So, will it be possible to update the advertising content by hooking the event BLE_EVT_END (also by checking the previous event code. i.e. BLE_EVT_TX) which is supposed to be generated in each completion of transmission?

But I wonder if the *latency* should be considered as that *app_adv_stop* & *app_adv_start* should be always called for changing the advertising content. Shall I wait for any call-back or event that is reporting from kernel for the completion of each call to *app_adv_stop* & *app_adv_start*? If such change of advertising content should be done in this manner, what's the maximum speed (or say minimum interval) that DA14580 support to change advertising content in *every ADV packet* (take ADV_NONCONN as example).

简而言之，如果我想在20ms的间隔内拥有信标，并在每个广告中旋转3个不同的消息，这将是可能的吗？

嗨Hardy.chen，

I believe that you can do that, check the last_ble_evt for a BLE_EVT_END and when that happens issue a advertising stop in order to change the advertising string. After the the completetion of the stop advertise procedure you can catch the advertise ending message in the gapm_cmp_evt_handler, case GAPM_ADV_UNDIRECT or GAPM_ADV_NON_CONN change the advertising string and start advertising again. I dont believe that the latency from the commands (app_adv_stop and app_adv_start) would be that large in order to be taken into account. You can have a look at the beacon implementation in the app_sleep.h file in the app_asynch_trm() function to get some ideas.

Thanks MT_dialog