Sometimes, Central fails initial connection with peripheralshttps://devzone.nordicsemi.com/f/nordic-q-a/29477/sometimes-central-fails-initial-connection-with-peripheralsHi, I have 3 nrf51822 devices. Two of them act as peripheral and one acts as central. Each peripheral is used in a wheel and they are the 2 wheels of a cart. Central is in the remote that controls the cart with 2 wheels. Min connection intervalen-USTelligent Community 13Tue, 16 Jan 2018 07:39:52 GMTRE: Sometimes, Central fails initial connection with peripheralshttps://devzone.nordicsemi.com/thread/117191?ContentTypeID=1Tue, 16 Jan 2018 07:39:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7ebb936c-551e-4e4e-a196-fd7999d0ac40run_ar<p>Also what is your scan window, and scan interval? Make sure the interval does not match the advertisment interval. i.e. since you are advertising at 200ms you should use a scan interval that makes sure the scan window overlaps with the advertisements.</p><div style="clear:both;"></div>RE: Sometimes, Central fails initial connection with peripheralshttps://devzone.nordicsemi.com/thread/117190?ContentTypeID=1Tue, 16 Jan 2018 07:34:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ddb0b0cc-378d-4f5c-a87b-e5e63b12f29crun_ar<p>Are the other &quot;extra bluetooth devices&quot; central device? If these are active scanners they might block the connection request occationaly.This behavior would be worse if the extra device is a lot closer to your peripheral than the wanted central.</p><div style="clear:both;"></div>