https://devzone.nordicsemi.com/f/nordic-q-a/56254/scanning-time-during-dual-role-operation-not-dual-modeI am in the process of evaluating different BLE solutions for a project. The project consists of a pair of BLE-enabled devices which need to be able to go into dual-role mode (simultaneous advertising and scanning) and connect to the other device. I woulden-USTelligent Community 13Tue, 07 Jan 2020 14:25:48 GMThttps://devzone.nordicsemi.com/thread/227927?ContentTypeID=1Tue, 07 Jan 2020 14:25:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bd78c58b-3609-4bec-83a0-de7ba1e499e4Einar Thorsrud<p>Hi Brian,</p> <p>The delays on the nRF5 devices with SoftDevice depend on several factors, as you can see under <a href="https://infocenter.nordicsemi.com/topic/sds_s140/SDS/s1xx/multilink_scheduling/multilink_scheduling.html?cp=4_5_3_0_14">Scheduling</a>. I do not have an exact number for this though.</p> <p>Regarding what you see (on the non-Nordic product), I can only speculate that the 10 ms could be related to the 0-10 ms random delay added to the advertising interval. This is a delay that you cannot escape since that is enforced by the BLE specification.</p> <p>If you want to increase the likelihood of the two devices being able to connect (not ending up in a situation where they both scan or advertise at the same time for a long time), you could perhaps regularly change the scan/advertising duty cycle randomly?</p><div style="clear:both;"></div>