https://devzone.nordicsemi.com/f/nordic-q-a/47536/ble5-fast-connection-timeI have an application (key fob) that needs to wake up on a button press. Scan and connect to a specific BLE device, then send one byte of data and disconnect and turn off. The button press and response needs to appear near instantaneous to the user. Whaten-USTelligent Community 13Tue, 21 May 2019 09:19:43 GMThttps://devzone.nordicsemi.com/thread/188167?ContentTypeID=1Tue, 21 May 2019 09:19:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:774f0304-0543-4824-9194-4e3e7d727164haakonsh<p>You&#39;ll get the shortest time to connection with the shortest scan and advertisement intervals. Try setting a scan interval of 7.5ms with a scan window of 7.5ms, and an advertisement interval of 7.5ms.&nbsp;<br /><br />Though I&#39;ve not tested myself i think you should expect 15-30ms time-to-connection on average.&nbsp;</p><div style="clear:both;"></div>