Some questions about power management and advertising

RE: Some questions about power management and advertising

Martin Lesund — Mon, 25 Jun 2018 08:54:21 GMT

Hi Gercer,

ble_advertising_start() is a function for starting advertising, and it is from the Advertising Module.

sd_ble_gap_adv_start() is a Softdevice API call to start advertising.

So if you look into the "ble_advertising_start()" in "ble_advertising.c" you can see that "sd_ble_gap_adv_start()" is actually called inside that function.

> I recommend using the Advertising Module

RE: Some questions about power management and advertising

gercer — Fri, 22 Jun 2018 22:15:53 GMT

Thanks for the answer!

I was looking at the uart demo and i noticed they use ble_advertising_start instead of sd_ble_gap_adv_start which is used in the ble_app_blinky demo. Could you explain my the main differences between them and which one is recommended?

RE: Some questions about power management and advertising

Martin Lesund — Thu, 21 Jun 2018 09:27:48 GMT

Hi Gercer,

I would recommend you to look at the "ble_app_uart" example and use that as reference since it is implemented just like you are aiming to program.

If you set #define APP_ADV_DURATION 1000, it will advertise in 10 seconds before it goes to sleep and wake up when you push a button.

1. No,you have to wake up the device before you can start to advertise. (Look at "ble_app_uart")

2. When the device is in "System OFF" mode, it will disable everything but not the wake-up source. I recommend you to play around with the Power Management Example.

3. This can be found in the Documentation:

- 0.3 μA at 3 V in System OFF mode
- 0.7 μA at 3 V in System OFF mode with full 64 kB RAM retention
- 1.9 μA at 3 V in System ON mode, no RAM retention, wake on RTC