https://devzone.nordicsemi.com/f/nordic-q-a/1925/nrf51-send-two-alternating-advertisementsWe have an application that is an apple ibeacon, plus some extra properties that can be read (battery level for example) The &quot;ibeacon profile&quot; eats up all the space in the advertisement frame, so i can&#39;t use it to announce any services. I was wonderingen-USTelligent Community 13Wed, 19 Mar 2014 10:15:36 GMThttps://devzone.nordicsemi.com/thread/8260?ContentTypeID=1Wed, 19 Mar 2014 10:15:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:30208450-c9c3-444e-9709-1c52c39da64fOle Morten<p>Yep, this could be a way to go. You can change advertisement data at any time, and there should be no problem with toggling between completely different sets. Each time an advertisement is sent on-air (i.e. for each advertising interval, as defined in your code), it&#39;s sent on all 3 advertising channels.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/8259?ContentTypeID=1Wed, 19 Mar 2014 02:17:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1beb9f7e-dd17-40ac-a8e3-07e040945ec7aep<p>To answer my own question partially: There doesn&#39;t appear to be any limit of when you can call ble_advdata_set. Just calling that in an app_timer interrupt switches the advertisement data instantaneously without downtime.</p> <p>I&#39;m not quite sure yet if it will solve my problem, but so far it looks promising.</p><div style="clear:both;"></div>