https://devzone.nordicsemi.com/f/nordic-q-a/66260/how-can-i-recognize-each-pair-of-nrf52840-dongleFirst of all, I ask for your understanding of my poor English. I am a student studying in Korea. Ask for help. I wonder how each pair recognizes each other when two pairs of dongle exist. I wonder what kind of information they recognize. I wonderen-USTelligent Community 13Wed, 23 Sep 2020 11:29:51 GMThttps://devzone.nordicsemi.com/thread/271055?ContentTypeID=1Wed, 23 Sep 2020 11:29:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cfd1dc29-5a03-4774-9e2f-e72932e009c1Jared<p>Hi,</p> <p>The central uses the connection handle to distinguish between links. For example, if you look at the <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/ble_sdk_app_multilink.html?cp=7_1_4_2_0_2">multilink example</a>, you&#39;ll see that the Central uses the specific connection handle to refer to a specific link:</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-36b1218cc9e54ca4af4287fc624044e9/pastedimage1600860268189v1.png" alt=" " /></p> <p>Each GAP Connected event has a 16 bit connection handle that is included in the <a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.api.v0.9.0/structble__gap__evt__t.html?resultof=%22%62%6c%65%5f%67%61%70%5f%65%76%74%5f%74%22%20">event struct</a>.&nbsp;Which means that you could store the 16 bit connection handle after a connection event to refer to that specific link later in your application. I think it would help if you reviewed the example in the SDK.</p> <p>best regards</p> <p>Jared&nbsp;</p><div style="clear:both;"></div>