https://devzone.nordicsemi.com/f/nordic-q-a/90928/the-ble-central-device-cannot-connect-some-special-ble-addrHi, I&#39;m using one board with nrf52832 and sdk 15.3.0,and alter the ble_app_mult_uart_c example as ble center ，there is another ble device(ble addr 4C :42 :44 :49 :43 :4A) as the slave device,the mobile phone can connect it.I try to use the central toen-USTelligent Community 13Fri, 12 Aug 2022 11:50:26 GMThttps://devzone.nordicsemi.com/thread/381347?ContentTypeID=1Fri, 12 Aug 2022 11:50:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b7820318-0f67-4bdd-bf3a-4cff29a13c0eEinar Thorsrud<p>Hi,</p> <p>Do the peer device use a public Bluetooth address? The Bluetooth scan module in the SDK had a bug where some&nbsp;public addresses are ignored, as discussed in <a href="https://devzone.nordicsemi.com/f/nordic-q-a/61512/issues-with-public-address-type-when-applying-scan-filter">this thread</a>. This issue is fixed in 17.1.0, so I suggest you refer to the scan module from there (nrf_ble_scan.c). The key point is that the address type was extracted from the 2 most significant bits, but this is not valid for public addresses, so the fix is to ignore the address type.</p><div style="clear:both;"></div>