https://devzone.nordicsemi.com/f/nordic-q-a/10712/advertising-intervalIs the advertising interval between two packets P1 and P2 defined as: Interval = P2_start - P1_stop (time between packets) or Interval = P2_start - P1_start (time from start to start) Kind regards Freddyen-USTelligent Community 13Tue, 08 Dec 2015 09:29:31 GMThttps://devzone.nordicsemi.com/thread/39995?ContentTypeID=1Tue, 08 Dec 2015 09:29:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bc3ae0a8-f009-4ce1-b3ab-6c96ab3745ecFreddy S&#248;rensen<p>Thanks RK,</p> <p>This explains why my interval variations. I was afraid it could be some kind of a interrupt priority problem.</p> <p>/Freddy</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/39994?ContentTypeID=1Mon, 07 Dec 2015 23:19:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:75063f4b-e491-4911-8976-1a8b8e8d219eRK<p>Section 4.4.2.2 BTLE Spec volume 6 (and a few afterwards) has the details on that.</p> <p>For undirected advertising the interval is Start -&gt; Start between advertising <strong>events</strong>. An advertising event usually does, but may not, consist of advertising packets on all of the 3 advertising channels, each &lt;10mS Start to Start of the individual packets inside the event.</p> <p>The time between the starts of those advertising events is the advertising interval plus a random delay of up to 10ms to avoid the situation two advertisers get in, and stay in, sync.</p><div style="clear:both;"></div>