https://devzone.nordicsemi.com/f/nordic-q-a/94758/ble-app-blinky-sample-connect-problemBLE-app-blinky client not working BLE-app-blinky sample build success, LED1 on, when connect LED2 on, but i can not see client service uuid in my android app. i cannot find NORDIC LED Button Service log: &lt;info&gt; app_timer: RTC: initialized. &lt;infoen-USTelligent Community 13Thu, 15 Dec 2022 13:56:04 GMThttps://devzone.nordicsemi.com/thread/400862?ContentTypeID=1Thu, 15 Dec 2022 13:56:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:47e0e9d2-b7eb-447b-9054-a07dcb5ae774Priyanka<p>Hi,</p> <p>I am not able to replicate this unfortunately.&nbsp;Did you try the same sample as follows?</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1671112515203v1.png" alt=" " /></p> <p>Also, which nRF5 SDK version are you using?</p> <p>-Priyanka</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/400294?ContentTypeID=1Tue, 13 Dec 2022 07:54:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3f71cd6e-fa06-47ef-9ae9-4ccbc7e395b7jys923<p>thank you for your answer</p> <p>my board is nrf52840 dk</p> <p></p> <p><span>changes&nbsp;:</span></p> <p>exclude from build SEGGER_RTT_Syscalls_SES.c</p> <p>soure is same</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/400168?ContentTypeID=1Mon, 12 Dec 2022 14:04:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e31c58d2-4446-49a3-9de3-2cca62487200Priyanka<p>Hi,</p> <p>Which board are you trying this on? Have you made any changes to the default sample?</p> <p>Best Regards,</p> <p>Priyanka</p><div style="clear:both;"></div>