https://devzone.nordicsemi.com/f/nordic-q-a/33873/android-app-cann-t-connect-ble-device-without-scanHi, I am develope a ble device use nrf51822 , when I use a Android app to connect the device without start a scan , only use the mac address to connect the device , I cann;t connect to the device success. And there is another device use CC2541, Ien-USTelligent Community 13Wed, 02 May 2018 03:51:17 GMThttps://devzone.nordicsemi.com/thread/130422?ContentTypeID=1Wed, 02 May 2018 03:51:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d29226d6-568b-4cf1-bcf5-59a47e910f15lemon<p>You are right,the reason is the address&nbsp;type.</p> <p>When&nbsp; I change&nbsp; the address type to publiec,it works fine.</p> <p>Thanks for your advice !!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/130278?ContentTypeID=1Mon, 30 Apr 2018 11:58:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:95380ed6-8485-4aa0-9f46-ee8d69cdfbe0David Edwin<p>This is my hypothesis, I suspect that the CCxxxx is using a public address while the nRF5x is using a random static address. You can change the address in the nRF5x to be a public address for a test (you can use that address on the CC with an offset just for the test).</p> <p>Additionally you can use a sniffer to see the addresses that are being used&nbsp;for the CC and the nRF5x and post it here so we can look at it.</p><div style="clear:both;"></div>