immediately disconnect and stop advertising

[Turnaev]

Hello!

I want the device to immediately stop any data transfer when it receives an external event, stop sending advertising and go to sleep.

How to do it right? After exiting the sleep mode, the functionality of advertising should be fully restored.

I could not find how to break the current connection on the device side. Similarly, I have not found how immediately to stop sending advertising.

[haakonsh]

Use sd_ble_gap_disconnect to disconnect a link. 
Use sd_ble_gap_adv_stop to stop advertisements.

Entering sleep is demonstrated in many ble examples.

Use ble_advertising_start to start advertisements.

[Turnaev]

Good! Thank you!