https://devzone.nordicsemi.com/f/nordic-q-a/27172/timeslot-extension-never-succeedHi, I have a working scanner and manage to require timeslots with the below timings. Interval 300ms, scan window 50ms, Timeslot length 10ms. But when i try to request timeslot extensions as low as 1ms it never works. nrf_radio_signal_callback_return_param_ten-USTelligent Community 13Mon, 16 Oct 2017 13:00:35 GMThttps://devzone.nordicsemi.com/thread/107036?ContentTypeID=1Mon, 16 Oct 2017 13:00:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:881793cc-8cd3-439e-8fac-578ff2cbe019Hung Bui<p>Hi Seb,</p> <p>Seems that the issue was at NRF_RADIO_CALLBACK_SIGNAL_TYPE_EXTEND_SUCCEEDED event, that you didn&#39;t set the callback_action to NONE.</p> <p>I attached here an example in SDK v14 I made (nRF52832, S132 v5.0), it should be similar on SDK v13.</p> <p>I use the timer start_timeslot_timeout_handler() to trigger a request for timeslot every second. The timeslot length is 35ms. Timer 0 CC[0] triggered after 30ms.</p> <p>The code request more 3 extensions (extension_count). When the last compare event triggered with CLOSE action, I will end the timeslot immediately, result in 120ms length timeslot (instead of 35x4 = 140ms)</p> <p>You can monitor pin 18-20 to verify the operation (description of the pins in the main loop)</p> <p><a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/ble_5F00_app_5F00_hrs-_2D00_-Timeslot.zip">ble_app_hrs SDK14- Timeslot.zip</a></p><div style="clear:both;"></div>