https://devzone.nordicsemi.com/f/nordic-q-a/54274/how-to-send-firmware-to-smt32-over-uartHi team, there is nRF52840 connected to STM32 via UART, the goal is to receive STM32 firmware over BLE (using nRF52840) and send the firmware to STM32 via UART. My goal is the following: receive the portion of the STM32 firmware and send it to STM32en-USTelligent Community 13Tue, 12 Nov 2019 12:09:57 GMThttps://devzone.nordicsemi.com/thread/219649?ContentTypeID=1Tue, 12 Nov 2019 12:09:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8913305b-55ee-470c-91d5-04716356db29Kenneth<p>Have you considered using&nbsp;<a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/ble_sdk_app_nus_eval.html?cp=5_5_0_4_2_2_24">https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/ble_sdk_app_nus_eval.html?cp=5_5_0_4_2_2_24</a>&nbsp;as a starting point, then by default all data is forwarded from BLE to UART. You can in the application add a fixed header to the BLE packets, to decide type of data (e.g. command byte + checksums, address, length etc) before forwarding to UART.</p> <p>Kenneth</p><div style="clear:both;"></div>