https://devzone.nordicsemi.com/f/nordic-q-a/2704/how-to-make-sure-my-data-sends-sucessfullyHi all! As we know, the funtion Nordic offer to send the ble data is called &quot;sd_ble_gatts_hvx()&quot;. But as far as I observe, this funtion just puts the data in the stack which will not send the data immediately, which means after running this funtionen-USTelligent Community 13Sat, 07 Jun 2014 02:10:20 GMThttps://devzone.nordicsemi.com/thread/10561?ContentTypeID=1Sat, 07 Jun 2014 02:10:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b9af5dc2-5903-4d3c-b3f9-9637b477562ekk<p>But which function should be used to receive this event?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/10560?ContentTypeID=1Fri, 06 Jun 2014 09:03:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:347a5cc4-947d-4ad2-b2f6-b9853d86fd0bUlrich Myhre<p>You will receive a BLE_EVT_TX_COMPLETE event once the data has been received by the peer. This event will contain the count of packets that were sent, and they will be sent in the same order that you queued them.</p><div style="clear:both;"></div>