https://devzone.nordicsemi.com/f/nordic-q-a/22059/fast-connection-intervalsWe are attempting to perform an OTA and as such want to transfer a large amount of data as quickly as possible. When I attempt to transfer the data with connection intervals any quicker than 25ms, the connection drops after a period of time. If Ien-USTelligent Community 13Tue, 16 May 2017 10:36:00 GMThttps://devzone.nordicsemi.com/thread/86578?ContentTypeID=1Tue, 16 May 2017 10:36:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b7224732-86c0-4ab8-bfd6-4fd8cdeee14fHung Bui<p>Hi Ken,</p> <p>Could you capture <a href="https://www.nordicsemi.com/eng/Products/Bluetooth-Smart-Bluetooth-low-energy/nRF-Sniffer/">a sniffer trace</a> ?</p> <p>Please try to debug the bootloader and check where it crashes (you need to set the optimization level to 0)</p> <p>We need to check how many packet is sent during a connection event. If the data stream is too high that it&#39;s faster that the speed of writing to flash we will have buffer overflow.</p> <p>In the legacy bootloader, we usually tested with 11.25ms, I&#39;m not 100% sure which is the minimum connection interval we tested with the secure DFU.</p><div style="clear:both;"></div>