how to turn off and on BLE service dynamically

RE: how to turn off and on BLE service dynamically

Aryawesly — Sat, 26 Sep 2020 06:18:13 GMT

Hi Kenneth,

Is it[stopping advertising or disconnecting the link] possible to do it wirelessly using nRF UART/some other application?

TIA.

RE: how to turn off and on BLE service dynamically

dimtai — Wed, 31 Oct 2018 01:10:56 GMT

Problem solved. Thanks again.

Best regards, Dimtai 10/31/18

RE: how to turn off and on BLE service dynamically

Kenneth — Tue, 30 Oct 2018 08:11:06 GMT

You should be able to call ble_advertising_start(BLE_ADV_MODE_IDLE); and sd_ble_gap_adv_stop(); to stop advertising.

It is possible to write to flash after enable softdevice, but then you typically need to use the FDS or fstorage. This module is typically already included by the peer manager if you are supporting bonding, so then you need to refer to documentation and/or find examples here in devzone on usage of FDS or fstorage.

Best regards,
Kenneth

RE: how to turn off and on BLE service dynamically

dimtai — Tue, 30 Oct 2018 02:35:23 GMT

Many thanks Ken.

Yes the current would drop to only a few uA if ble_advertising_start() is off. Your suggestion of disconnection sounds like a good solution. But I searched API and could not find ble_advertising_stop() command or something like that. Any hints?

Another related issue is writing to flash. I can write to chip flash successfully before ble services start (ble_stack_init() in my code). However, I can never write the flash after ble services are on. I heard people saying that ble needs to be stopped in order to write flash. I guess the same principle applies here. am I right?

Best regards, Dimtai 10/30/2018

RE: how to turn off and on BLE service dynamically

Kenneth — Mon, 29 Oct 2018 13:19:28 GMT

Hi,

If I understand you correctly, then you are saying that if you comment out:
// advertising_start(erase_bonds);

Then the current consumption is about 4uA, that should be the case. Otherwise I suspect you have some peripherals enabled or logging enabled in some way.

The current consumption when you advertise depends on the advertisement interval and you can try to get some current consumption estimations here:
https://devzone.nordicsemi.com/power/

It is of course possible to disable the softdevice, but it should not be necessary. Instead you simply stop advertising or disconnect the link when you have transferred whatever you wanted to transfer.

Best regards,
Kenneth

RE: how to turn off and on BLE service dynamically

Luk3 — Mon, 29 Oct 2018 09:40:52 GMT

Maybe using Timeslot API will be helpful?

devzone.nordicsemi.com/.../setting-up-the-timeslot-api