Fast advertising and slow advertising

RE: Fast advertising and slow advertising

FormerMember — Tue, 01 Mar 2016 06:58:31 GMT

If you want your device to have a shorter advertising interval than 100 ms, it can advertise as a connectable device and set it up to disconnect immediately upon a potential connection.

RE: Fast advertising and slow advertising

FormerMember — Mon, 29 Feb 2016 13:35:04 GMT

I have updated my answer to answer your questions.

RE: Fast advertising and slow advertising

Shorosky — Mon, 29 Feb 2016 11:24:38 GMT

Thanks for answering. I have readed the question, and documentation. I have a question of using advertising_init function, and it is that I don't know how to configure a no connectable device. If I configure a no_connectable_device using sd_ble_gap_adv_start manually, I can't advertise faster than a 100ms period. Is it possible to configure a no_connectable_device with advertising_init(...), or will I need to configure it manually? Can I reduce the advertising period, if I configure this kind of advertising?

Thank you.

Update 29.02.16: So I can't advertise faster than 100ms on non_connectable_mode. I was confused about it. My application is based on ble_app_hrs_c example and ble_app_beacon example. I guess that I have to configure Advertising type manually (calling to sd_ble_gap_adv_start(...)), like on ble_app_beacon. The code that I have written at first works fine, but I wanted to configure it by the best way.

Thank you very much! Regards.

RE: Fast advertising and slow advertising

FormerMember — Mon, 29 Feb 2016 09:13:02 GMT

ble_adv_modes_config is the type that you use to set the advertising interval and timeout for a given advertising mode. In the example from advertising_init(..) below, fast advertising is enabled with a given advertising interval and timeout:

    ble_adv_modes_config_t options = {0};
    options.ble_adv_fast_enabled  = BLE_ADV_FAST_ENABLED;
    options.ble_adv_fast_interval = APP_ADV_INTERVAL;
    options.ble_adv_fast_timeout  = APP_ADV_TIMEOUT_IN_SECONDS;

ble_gap_adv_params_t is only used internally in advertising.c. It is used to apply the the advertising settings set in advertising_inti(..) for the various advertising cases in advertising_start(..).

I would also recommend you to take a look at the documentation for the advertising module and the answer to this question, it explains the flow of the advertising module.

The advertising interval should be within the range 20 ms to 10.24 s.

Update 29.02.16: When advertising in a non-connectable mode, ADV_SCAN_IND or ADV_NONCONN_IND, the minimum advertising interval is 100 ms. The Bluetooth Core Specification v4.2 says the following in Vol 2, Part E, chapter 7.8.5:

The Advertising_Interval_Min and Advertising_Interval_Max shall not be set to less than 0x00A0 (100 ms) if the Advertising_Type is set to 0x02 (ADV_SCAN_IND) or 0x03 (ADV_NONCONN_IND).

ADV_SCAN_IND: Scannable undirected advertising

ADV_NONCONN_IND: Non connectable undirected advertising

For how to configure a non-connectable device, you can take a look at the ble_app_beacon example in the SDK.