https://devzone.nordicsemi.com/f/nordic-q-a/63447/nrf52840-ble-ota-implementation-on-central-and-peripheral-sidesHi! Currently I am working on a project based on nRf52840 used in wearable, battery backed sensors and one acting as a central device. Since most data exchange functionality is implemented I have started working on DFU. The central device firmware isen-USTelligent Community 13Tue, 07 Jul 2020 21:11:38 GMThttps://devzone.nordicsemi.com/thread/258886?ContentTypeID=1Tue, 07 Jul 2020 21:11:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fb4889b6-9423-41cb-9246-507509e821cahabibfarahani<p>Thank you Terje! That is what I thought but having your confirmation will allow me to scope the efforts better.</p> <p></p> <p>Cheers</p> <p>HF</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/258780?ContentTypeID=1Tue, 07 Jul 2020 11:26:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a9143cb5-8b08-4006-8969-d623abe405d5tesc<p>Hi,</p> <p>With nrfutil, for BLE DFU, it uses an nRF device for BLE connectivity, and the DFU controller itself is run on the PC. Therefore it starts by downloading connectivity firmware to the connected device.</p> <p>I am afraid we do not have DFU controller firmware examples, only DFU target examples, for nRF devices. We do however have implementations for pc, that you can use for reference (<a href="https://github.com/NordicSemiconductor/pc-nrfutil/tree/master/nordicsemi/dfu"><strong>nrfutil source code</strong></a> on github, <a href="https://github.com/NordicSemiconductor/pc-ble-driver-js/tree/master/api/dfu">pc-ble-driver-js</a> which is used for nRF Connect for Desktop.) The <a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fsdk_nrf5_v17.0.0%2Flib_bootloader_modules.html">protocol and BLE transport for DFU</a> is also pretty well documented on Infocenter.</p> <p>Regards,<br />Terje</p><div style="clear:both;"></div>