https://devzone.nordicsemi.com/f/nordic-q-a/73581/to-send-1-byte-data-from-the-nrf52840-dongle-to-the-mobile-application-nrf-connect-and-vice-versaHello Sir/Ma&#39;am, I have used the ble_app_uart (for pca10056) example code to execute the same. I referred this link to execute my code https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/ble_sdk_app_nus_eval.html Mentioned below are the necessaryen-USTelligent Community 13Wed, 07 Apr 2021 12:02:01 GMThttps://devzone.nordicsemi.com/thread/303480?ContentTypeID=1Wed, 07 Apr 2021 12:02:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9bc22de3-4bde-499d-b8dc-f1eabe80537cSeema<p>hello sir,</p> <p>Thank you so much for your response sir.</p> <p>I will execute it as you suggested and get back with it sir.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/303417?ContentTypeID=1Wed, 07 Apr 2021 09:31:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0d4f6d58-5ff2-471d-88a5-32fe6cc05bb8Vidar Berg<p>Hello,</p> <p>You need to keep the original linker settings since you are using the Softdevice. The new start address at 0x1000 will not work because it will make the application code overlap with the Softdevice.</p> [quote user=""]Also after I flash the code to the dongle using DFU (nRF Connect for Desktop) the Com port is unavailable and the mobile app does not detect the Bluetooth module(or is not advertising).&nbsp;[/quote] <p>&nbsp;The ble_app_uart example does not initialize the <span><a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/usbd.html?cp=4_0_0_5_34">USBD</a> </span><span>peripheral. Instead I&#39;d recommend you start with the <a title="USBD BLE UART Example" href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/usbd_ble_uart_example.html?cp=7_1_4_6_50_1">USBD BLE UART Example</a></span></p><div style="clear:both;"></div>