https://devzone.nordicsemi.com/f/nordic-q-a/14454/a-question-about-the-supervision-timeoutHI,ALL There are such statement in the CORE SPEC 4.2 &quot; If the Link Layer connection supervision timer reaches 6 * connInterval before the connection is established (see Section 4.5), the connection shall be considered lost. This enables fasten-USTelligent Community 13Mon, 13 Jun 2016 03:34:31 GMThttps://devzone.nordicsemi.com/thread/55210?ContentTypeID=1Mon, 13 Jun 2016 03:34:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ba90f207-23be-4c88-9e69-0a3d4de4608fRK<p>No the connection will not be lost if you connect two devices and do absolutely no reading or writing or anything else. The two things you quote have absolutely nothing to do with reading and writing or operations performed on the link. The link layer will continue to swap packets at the connection interval frequency to keep the link alive whether you are using it or not.</p> <p>Have you tried reading any of the few bluetooth LE books which explain all this as you seem to ask question after question about small pieces of the spec, all of which are covered in those books.</p><div style="clear:both;"></div>