https://devzone.nordicsemi.com/f/nordic-q-a/20815/problem-with-ble-read-dataHello ! I&#39;m beginning work with BLE . I have a project in which nrf51 is a central. App from smartphone will sending to central any key for example &quot;3214941E0&quot; when central accept this key for example led light up. I already read all tutorials but Ien-USTelligent Community 13Tue, 28 Mar 2017 09:01:26 GMThttps://devzone.nordicsemi.com/thread/81310?ContentTypeID=1Tue, 28 Mar 2017 09:01:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6fd495e1-5dff-487f-ba66-54ac6955672drun_ar<p>As endnode says, please look at the tutorials section. The <a href="https://devzone.nordicsemi.com/tutorials/21/">central tutorial</a> should answer your question. Maybe you can take another look at that, and see if you have a more specific questions. Note that on the peripheral there will be an write event when the &quot;key&quot; is received so you can choose to do some action based on that.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/81311?ContentTypeID=1Sun, 26 Mar 2017 22:10:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2bf25071-4b4e-43ce-b311-7c2b1aac0c27endnode<p>I&#39;m afraid these Tutorials and nRF5 Get Started on Infocenter are the best sources, there is no magic bypass from &quot;I don&#39;t know&quot; to &quot;my project magically works, I&#39;m done&quot;...</p><div style="clear:both;"></div>