Nordic UART Service Stops Advertising

RE: Nordic UART Service Stops Advertising

Joakim Jakobsen — Thu, 05 Dec 2019 11:41:14 GMT

Sorry, I forgot to mention that.

You are correct, thanks for pointing that out!

Best regards,
Joakim

RE: Nordic UART Service Stops Advertising

chrismy — Thu, 05 Dec 2019 04:48:13 GMT

Hi Joakim,

I've since found in another post that you also need to also change the value of init.advdata.flags.

https://devzone.nordicsemi.com/f/nordic-q-a/46494/define-app_adv_duration-18000-or-0

After making that change it seems to work OK now.

Thanks,

Chris.

RE: Nordic UART Service Stops Advertising

chrismy — Thu, 05 Dec 2019 04:16:50 GMT

Hi Joakim,

Setting APP_ADV_DURATION to 0 doesn't seem to work. The function ble_advertising_init() returns 0 (so I guess it was successful). With APP_ADV_DURATION set to zero it doesn't seem to advertise at all.

Thanks,

Chris.

RE: Nordic UART Service Stops Advertising

Joakim Jakobsen — Tue, 03 Dec 2019 12:19:38 GMT

Hi.

If you take a closer look at the source code, you can see that this is the expected behavior of the ble_app_uart example.

In the example (note that line numbers may differ due to changes you have made);
main.c, line:92

#define APP_ADV_DURATION 18000 /**< The advertising duration (180 seconds) in units of 10 milliseconds. */

This define is used in the advertising_init() function:
main.c, line:624

init.config.ble_adv_fast_timeout = APP_ADV_DURATION;

This define will stop the advertising if no connection has been initiated after 3 minutes (180 seconds), and the device will go to sleep. If you are using the nRF52-DK, you can wake up the device again by pressing one of the buttons. The DK will then wake up and advertise for the defined duration before going back to sleep again.

You will need to change this in order to advertise for more than 180 seconds.
Changing the APP_ADV_DURATION to 0 will make your device advertise indefinitely.

Best regards,
Joakim