https://devzone.nordicsemi.com/f/nordic-q-a/105310/reconnection-requires-additional-waiting-for-specific-donglesDongle: CSR8510 Bluetooth 4.0 over USB Driver: Microsoft (Windows 10) 10.0.19041.3570 SoftDevice S113 7.3.0 Sniffer Snapshot: As you can see, after the initial connection, there was 10.8 seconds of silence (almost constant) before communicationen-USTelligent Community 13Thu, 02 Nov 2023 12:30:24 GMThttps://devzone.nordicsemi.com/thread/453706?ContentTypeID=1Thu, 02 Nov 2023 12:30:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0ccd1d43-f165-4e11-bc53-be9992681694Kenneth<p>Hello,</p> <p>Can you share the sniffer log?</p> <p>Might not be related, but I can see the peripheral is sending a security request upon connection, I have seen this can be problematic with some centrals. Try to remove (comment out) pm_handler_on_pm_evt() call from the pm_event_handler() function in main.c.</p> <p>Kenneth</p><div style="clear:both;"></div>