https://devzone.nordicsemi.com/f/nordic-q-a/63237/setprn-commandHi! Some prerequisite info: We are using nrf52840 boards as our peripherals We are using v16.0.0 SDK We are using the s113 SoftDevice, more specifically s113_nrf52_7.0.1_softdevic e. Since our central code is written in .NET Core, we use Windowsen-USTelligent Community 13Thu, 02 Jul 2020 13:30:40 GMThttps://devzone.nordicsemi.com/thread/258121?ContentTypeID=1Thu, 02 Jul 2020 13:30:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a7999899-1b91-4bf3-ba96-c834e425ca4cRoiger<p>Great! Many thanks Edvin!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/258032?ContentTypeID=1Thu, 02 Jul 2020 09:36:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:67a2c2b6-520c-4a7d-aeac-e400a2c336ebEdvin<p>Hello Roi,</p> <p>PRN (Packet Receipt Notification) is a feature in the serial bootloader, which is why you don&#39;t see it mentioned in the BLE DFU protocol.</p> <p>But if you are interrested, it is mentioned here: <a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.0.0/lib_dfu_transport_serial.html?cp=7_5_3_3_5_2_3" rel="noopener noreferrer" target="_blank">Bootloader and DFU modules -&gt; DFU Protocol -&gt; Serial</a>.</p> <p>PRN is a CRC check that is used to ensure retransmissions if there are any bit errors on the serial transport. In BLE, the specification (implemented by the softdevice) ensures there are no bit errors. The Link Layer in the BLE link has it&#39;s own CRC check.</p> <p></p> <p>I hope this cleared some of your questions regarding PRN. Please let me know if anything was unclear.&nbsp;</p> <p></p> <p>Best regards,</p> <p>Edvin</p><div style="clear:both;"></div>