https://devzone.nordicsemi.com/f/nordic-q-a/15645/packet-delivery-timeHello Nordic! Regarding Notifications on the s110, once sd_ble_gatts_hvx(conn_handle, &amp;params) returns NRF_SUCCESS , how long does it take, at most, in units of CI (Connection Interval), for the packet to be delivered to the Central and why?en-USTelligent Community 13Wed, 10 Aug 2016 10:37:41 GMThttps://devzone.nordicsemi.com/thread/59747?ContentTypeID=1Wed, 10 Aug 2016 10:37:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5cbcd983-a7cd-49a2-89ab-0c7a01c2c839&#216;yvind Karlsen<p>Hi,</p> <p>In BLE packets are sent at a fixed rate, determined by the connection interval. A ballpark answer is that after returning from sd_ble_gatts_hvx you will get approximately one connection interval delay before it is sent. Once on the air it is transferred at the speed of light, so this is negligible.</p> <p>In reality the delay will depend on congestion (if many packets are queued), current radio conditions and so on.</p> <p>Best regards,</p> <p>Øyvind</p><div style="clear:both;"></div>