ble_app_uart ble timeout problem

[JaeHo]

Hi, all! Sorry, I'm not good at English myself.

My device is nrf52832. Example code is ble_app_uart (pca10040, s132), I did not modify the code.

My problem.

Ble will sleep when Not connet for few time. (APP_ADV_TIMEOUT_IN_SECONDS is 180)

1. Power on (First start) : My Device is Nordic_UART

2. Afer few minute(180sec) : My device is not scanned.

How to let ble always available?

I have tried this. but It was not resolved.

I want connect my device always.

Thank you for reading this question!

[Joakim Jakobsen]

Hi JaeHo!

As max said in his answer, you should set the advertisement timeout to zero:

#define APP_ADV_TIMEOUT_IN_SECONDS     0

However, if you want to advertise forever you need to set the LE General Discoverable Mode flag, not the LE Limited Discoverable Mode flag.

So in advertising_init(), change the:

advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

to

advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;

and your device should advertise forever.

Hope that works.
Best regards,
Joakim.

[JaeHo]

Thanks to you, I've solved it. I heartily thank you.

ADD. Advertise forever Does this function consume a lot of battery? Is there a way to reduce battery consumption using this function?

[Joakim Jakobsen]

It won't make your board consume any more power when advertising. But it will of course drain more power over time, as the board never stops advertising.
You can try to reduce the power consumption by changing the advertisement interval etc.
Best regards.