https://devzone.nordicsemi.com/f/nordic-q-a/113561/clock-sync-using-periodic-advertisingI want to sync the clocks of 2 BLE devices as accurate as possible. My thought was to use periodic advertising, because the radio opening window is 30[usec] so this accuracy is very good for my needs. Now I only need to call k_uptime_get() just beforeen-USTelligent Community 13Thu, 01 Aug 2024 20:31:30 GMThttps://devzone.nordicsemi.com/thread/496714?ContentTypeID=1Thu, 01 Aug 2024 20:31:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3e1b2f97-5e27-4629-abb8-65ff275b8ac6Hieu<p>Hi Dor Sadeh,</p> <p>You can use&nbsp;<a href="https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/protocols/bt/ble/radio_notification_conn_cb.html">Radio Notification callback</a>&nbsp;to get a callback when the RADIO peripheral is started or stopped. It seems this feature is new&nbsp;and hasn&#39;t been included in an official SDK release yet, however.</p> <p>You could also use PPI to connect a GPIO output event to a relevant RADIO event, and&nbsp;then&nbsp;connect the GPIO output to a GPIO input for an interrupt.</p> <p><a href="https://docs.nordicsemi.com/bundle/ncs-2.7.0/page/nrf/samples/bluetooth/iso_time_sync/README.html">Bluetooth: ISO time synchronization (nordicsemi.com)</a>&nbsp;is also a&nbsp;solution for time sync.</p> <p>Finally, there is also a proprietary time sync solution from Nordic, but this&nbsp;also seems not released yet. It is demonstrated here:&nbsp;<a href="https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/bluetooth/conn_time_sync/README.html">Bluetooth: Connection time synchronization (nordicsemi.com)</a>.</p> <p>Hieu</p><div style="clear:both;"></div>