two NRF51822 communication fails sometimes

[phob]

Hi, I am using 2 nrf51822 devices. one is central and other one is peripheral. I am using s130 softdevice. When i was trying to connect NRF51822 to other nrf51822. i tried for 1st time then communication happens. But later communication happens once in 10 time.

But when i was trying to connec NRF51822 with NRF52 DK board NRF51822 was central and NRF52 DK was peripheral. That time communihcation was happening everytime.

What could be the problem.

[run_ar]

@phob are you using the same sdk for both the nRF51 and nRF52 peripheral? Are they using the same advertisement parameters (interval and timeout) and adv data? did you use an sdk example or a custom application?