https://devzone.nordicsemi.com/f/nordic-q-a/2056/problem-with-application-based-on-masteremulator--proximitydemoHI, I wrote my application based on &quot;MasterEmulator-&gt;ProximityDemo&quot; for testing device with nrf51822. My device have to switching between Gazell and BLE stacks so all the time BLE is breaking. The problem is that when i read data from pipe using PC applicationen-USTelligent Community 13Mon, 05 May 2014 15:16:38 GMThttps://devzone.nordicsemi.com/thread/8821?ContentTypeID=1Mon, 05 May 2014 15:16:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:749c6154-e31c-4d35-b1bb-6babd9996383Firek<p>Thanks for the correction. It works well.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/8820?ContentTypeID=1Wed, 23 Apr 2014 14:22:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ccdfaa58-1b19-4132-9d96-15ae007b3f2dBj&#248;rn Inge<p>The problem seems to be caused by a race condition between an outbound ATT request and an inbound disconnect event. The ATT request gets sent just as the link has been terminated, and MCP keeps waiting for up to 30 seconds for the response which obviously never gets received as the link is terminated. Latest version of Master Control Panel, v3.6.0, includes an improvement that should cover the issue you are seeing.</p><div style="clear:both;"></div>