https://devzone.nordicsemi.com/f/nordic-q-a/94481/nrf52840-how-to-resend-packet-immediately-when-send-packet-to-peer-failedHello! This is my problem. SDK：SDK17 Softdevice : S140 Board: nrf52840 The connect interval is 135ms. But the latency I test is larger than connect interval. So, I used sniffer to find the problem. I find the first packet was sent to slaveen-USTelligent Community 13Fri, 02 Dec 2022 13:12:49 GMThttps://devzone.nordicsemi.com/thread/398771?ContentTypeID=1Fri, 02 Dec 2022 13:12:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d6989be2-5080-433b-8a6f-b22ccbe21e2aSimonr<p>Hi</p> <p>When a packet isn&#39;t received correctly, the master will wait out the connection interval for a response before trying to send a new packet if it doesn&#39;t get a response. After the event lengths was added to the BLE specification, if there is room for an event within the event length of the connection interval, the next event&nbsp;<strong>can </strong>fit if the same interval if another event fits within your connection interval.&nbsp;The other option would be to mitigate the number of missed packets&nbsp;somehow by increasing TX/RX power and maybe physically reduce the range between the two devices, but these missed packets will still happen now and again, as the BLE specification won&#39;t provide a 100% packet success rate.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>