https://test-devzone.nordicsemi.com/f/nordic-q-a/88397/central--peripheral-connectionHi all I have an issue regarding central- peripheral connection.( using nRF52832) In the past I developed a peripheral device using SDK 11. In order to manufacture it- I’ve also developed a “tester” using a ble_central example. The tester’s joben-USTelligent Community 13 Non-ProductionMon, 30 May 2022 14:06:06 GMThttps://test-devzone.nordicsemi.com/thread/370019?ContentTypeID=1Mon, 30 May 2022 14:06:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6a86ef60-2a60-4457-a2f7-9791286acb6aHung Bui<p>Hi Yona,&nbsp;<br /><br /></p> <p>I would suggest to get familiar with our <a href="https://www.nordicsemi.com/Products/Development-tools/nRF-Sniffer-for-Bluetooth-LE">nRF Sniffer.&nbsp;</a>&nbsp;</p> <p>With the sniffer you can analyze the connection and see what happens over the air.&nbsp;<br />My suspicion is that the new application support LESC when your central doesn&#39;t and it might be the reason it reject the pairing. But we need to have a look at the sniffer trace to really tell what&#39;s going on.&nbsp;</p><div style="clear:both;"></div>