https://devzone.nordicsemi.com/f/nordic-q-a/28615/pairing-issuesHi Guys, I&#39;m currently developing an app using BLE nrf18522 development beacons. So I just bought 10 and did a test in a big park with the beacon Tx set to -60dBm and beacons around 30-40m apart. I did a test. Only 2 paired immediately, 3 tooken-USTelligent Community 13Mon, 18 Dec 2017 09:31:45 GMThttps://devzone.nordicsemi.com/thread/113426?ContentTypeID=1Mon, 18 Dec 2017 09:31:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:260ba922-3668-41ac-a7f4-2c6c87ac01c5run_ar<p>Are you sure you are using -60dBm? As endnode says, that doesn&#39;t sound like a nRF51822.. Regardless:</p> <ul> <li>Does this work if you run all the beacons at 0dBm</li> <li>Did you try printing the RSSI of the devices you are trying to pair with to see if they are within range?</li> <li>Also, remember that the antenna is more or less directional.</li> </ul><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/113425?ContentTypeID=1Sun, 17 Dec 2017 22:05:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cbcd1eb6-530a-4b31-8654-ec202995808eendnode<p>What would suggest that beacons with Tx power at -60dBm (which btw. indicates that these are not nRF5x because there you cannot set to lower Tx Power then -40/30dBm) and being 30m apart indoors should see each other and connect easily? Anyway as usually radio analyzer/BLE sniffer is the ultimate tool to debug any problems on the lowest layer.</p><div style="clear:both;"></div>