https://devzone.nordicsemi.com/f/nordic-q-a/22889/can-t-i-connect-to-device-that-hasn-t-been-discovered-yet-but-with-addressCan&#39;t I connect to device that hasn&#39;t been discovered yet?? I&#39;m trying to connect one device( A ) to another device( B ) which ADDRESS is known but never discovered yet. The reason why it isn&#39;t discovered is, the target device that I want to connecten-USTelligent Community 13Sun, 18 Jun 2017 21:20:14 GMThttps://devzone.nordicsemi.com/thread/90014?ContentTypeID=1Sun, 18 Jun 2017 21:20:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2436f0fd-8b48-4d68-92bb-29aebe2d1ab1endnode<p>What do you mean by &quot;discovered&quot;? In Broadcasting/Scanning phase there is only that: advertising and scanning (aka listening). Until one side is properly scanning and the second properly broadcasting then listener should &quot;find&quot; the broadcaster sooner or later, there is no hidden catch in it (beside timing - where obviously better scanning &quot;duty&quot; cycle and faster advertising makes it more probable - and things like directed advertisement with certain white list etc.) Then if Broadcasting device is connectable then you should be able to issue CONNECT_REQ from Scanner&#39;s side and they will become GAP Peripheral and Central. Yes, Peripheral can terminate the link any time, you also can have collision or other error on CONNECT_REQ and so you would need to retry (after both sides recover from the situation by some timeouts or similar mechanisms).</p><div style="clear:both;"></div>