https://devzone.nordicsemi.com/f/nordic-q-a/7120/ble-advertisement-rate-actual-rate-do-not-matchI currently have a Braveridge device which uses an advertising rate of 50 Hz (connection interval is 20ms) CONNECTABLE_ADV_INTERVAL is set to 0x0020 sd_ble_gap_adv_start(&amp;m_adv_params); In the advert packet I have a counter(1byte), so I can determineen-USTelligent Community 13Tue, 14 Nov 2017 21:17:28 GMThttps://devzone.nordicsemi.com/thread/25154?ContentTypeID=1Tue, 14 Nov 2017 21:17:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2baa2ae7-be77-4d05-81b3-ac17f40ac5c8jemajuca<p>Hello. Considering the effect of the advDelay, it seems impossible to match with the Apple requirements. (Bluetooth Accessory Design Guidelines for Apple Products, section 3.5, Advertising Interval)</p> <p>Let&#39;s say I want to select 318.75 ms, which value should be selected?</p> <p>Which should be the correct advertising interval setting? 324? (319 + advdelay/2) Regards.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/25153?ContentTypeID=1Tue, 19 May 2015 12:52:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0b33fbfc-850e-490d-98ee-e46d3c7d2755Petter Myhre<p>Good question.</p> <p>From the Bluetooth Core specification, Vol 6, Part B, Section 4.4.2.2:</p> <blockquote> <p>The time between two the start of two consecutive advertising events is computed as follows for each advertising event:</p> <p>T_advEvent = advInterval + advDelay</p> </blockquote> <blockquote> <p>The advDelay is a pseudo-random value with a range of 0 ms to 10 ms generated by the Link Layer for each advertising event.</p> </blockquote> <p>If this averages to 5 ms you end up with (20ms + 5ms)f = 1000ms -&gt; f=40Hz.</p><div style="clear:both;"></div>