https://devzone.nordicsemi.com/f/nordic-q-a/12856/serial-dfu---exit-commandI&#39;m using an nRF51822 on a custom board with Nordic&#39;s serial DFU example from SDK v10.0.0. I&#39;m trying to find a way to exit the serial DFU without the DFU trying to update the app. I figured writing the stop command without writing anything else woulden-USTelligent Community 13Tue, 24 May 2016 14:32:06 GMThttps://devzone.nordicsemi.com/thread/48913?ContentTypeID=1Tue, 24 May 2016 14:32:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9c4168a4-41ce-4833-adfe-7bb25a100c30jpreston<p>Thank you! Looking at the BLE Core Spec helped a lot in understanding the protocol, particularly the escape bytes!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/48912?ContentTypeID=1Thu, 31 Mar 2016 14:18:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:81e4ce0f-3961-4c08-84fe-fc768d64ddeabjorn-spockeli<p>Yes, it should be possible. You&#39;ll have to create you own packet type, like the Init, Start, Data and Stop packets, described on <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v11.0.0/bledfu_transport_serial.html?cp=4_0_0_4_3_1_4_2">this</a> Infocenter page, for simplicity lets say 0x06.</p> <p>Send the custom packet over the HCI transport layer and when the packet is processed in <code>process_dfu_packet()</code> you just check if the packet type is 0x06(or whatever you decide to call it) and call <code>NVIC_SystemReset()</code>.</p> <p>Regarding the documentation, you&#39;ll have to take a look at the Bluetooth Core Specification (Volume 4, Part D) - HCI Three-Wire UART Transport Layer.</p> <p>-Bjørn</p><div style="clear:both;"></div>