https://devzone.nordicsemi.com/f/nordic-q-a/11619/one-set-of-paired-devicesHi, I have two nrf51 devices one is the master and other a slave device. I need to lock these two devices permanently. What I mean is that these two devices can only connect to each other but not any other device. My requirement is as follows. 1en-USTelligent Community 13Tue, 02 Feb 2016 14:40:45 GMThttps://devzone.nordicsemi.com/thread/43920?ContentTypeID=1Tue, 02 Feb 2016 14:40:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ab8cf010-455d-448f-930b-a5b00597b5e9tesc<p>Hi,</p> <p>1.) You can enable whitelisting on the central to connect to a given set of peripherals only.</p> <p>2.) You can enable whitelisting on the peripheral to accept connections from a given set of centrals only. You can also use directed advertising to advertise to one selected central only.</p> <p>3.) The peripheral must advertise to get incoming connection requests from centrals, but as stated above it can use directed advertising to advertise to one central only.</p> <p>There is some limited information about whitelisting and directed whitelisting in the documentation for the <a href="http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk51.v10.0.0%2Flib_ble_advertising.html&amp;cp=4_0_1_3_1_1">advertising module</a> and for the (new, experimental, to replace device manager) <a href="http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk51.v10.0.0%2Flib_pm_usage.html&amp;cp=4_0_1_3_1_10_2_4&amp;anchor=lib_pm_usage_whitelist">peer manager</a>.</p> <p>Regards, Terje</p><div style="clear:both;"></div>