https://devzone.nordicsemi.com/f/nordic-q-a/9235/why-my-app-can-not-connect-nrf51822Is there any extra requirements When a Android APP connect to my Ble Decice? I want connect to my Ble device(51822) by my Android APP(EZ-GUI Ground Station V3.208.208), But it can&#39;t be connectted, Can you tell me the possible reason? (Platform: s110v6en-USTelligent Community 13Tue, 15 Sep 2015 11:43:42 GMThttps://devzone.nordicsemi.com/thread/34080?ContentTypeID=1Tue, 15 Sep 2015 11:43:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:42f5930e-f6e6-4b6f-8230-3bacfc8092a4Hung Bui<p>@Chenyu: No, there is no extra requirement.</p> <p>Which error did you have ? Have you tried to follow the source code provided in the nRFUart example app ?</p><div style="clear:both;"></div>