Is race condition possible when stopping advertising?

[Al Bundy]

Is race condition possible when stopping advertising?

I need to disable BLE for some time to perform critical tasks. I need to stop advertising and be disconnected.

Let's consider simple code snippet that runs with the lowest priority:

	if (m_conn_handle == BLE_CONN_HANDLE_INVALID) {
		sd_ble_gap_adv_stop();
	}

Is it possible that after checking connection handle and before stopping advertising some device might connect to my device and in the end I will be in connection while performing critical tasks?

[MartinBL]

Hi, 

Sorry for the slow response.

What Softdevice are you using?

[Al Bundy]

S110, SDK v.8

[MartinBL]

How about calling sd_ble_gap_adv_stop() no matter what, and then call sd_ble_gap_disconnect() right after? Both sd_ble_gap_adv_stop() and sd_ble_gap_disconnect() just return NRF_ERROR_INVALID_STATE if the advertiser is not running or if the device is not in a connection. That should ensure that your device is not advertising and if a race condition occurred and a peer device connected while the function was executing, it will get disconnected immediately.