https://devzone.nordicsemi.com/f/nordic-q-a/18402/determine-whether-notification-has-been-sentHello, is there a possibility on nrf51 8.0.0 softdevice to determine whether particular notification has been received by remote device? I use sd_ble_gatts_hvx() to send notifications and I know that softdevice can buffer multiple notifications anden-USTelligent Community 13Wed, 14 Dec 2016 14:44:05 GMThttps://devzone.nordicsemi.com/thread/71028?ContentTypeID=1Wed, 14 Dec 2016 14:44:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:790c6bf2-f348-4929-b74b-553914fb058fFormerMember<p>By spec, notifications are not intended to be used if the application needs an ack from the client. Therefore, it is not possible to get an event/callback in the application layer when the client has ack&#39;ed a notification.</p> <blockquote> <p>(Bluetooth Core Specification, v.4.2, Part G, Chapter 4.10.1) This sub-procedure [notifications] is used when a server is configured to notify a Characteristic Value to a client without expecting any Attribute Protocol layer acknowledgment that the notification was successfully received.</p> </blockquote> <p>I don&#39;t know if it can be of any value, but you could have a look at radio notifications from the softdevice. Radio notifications are events notifying that the radio is active/not active.</p> <p>Can I ask why you need to know when a specific notification was received at the client side?</p><div style="clear:both;"></div>