BLE Central communication breaks app_timer

[Sergy]

Scenario is as follows: NRF52 (SDK12.1, SD3.0) works in central and peripheral mode.

What happens is that on start we create a single shot timer with 4.2second to wait for external device being activated on UART. For some reason if central->peripheral connection starts right away timeout handler doesnt get executed. If central->peripheral link gets created later the first timer event works out fine, but after connection is made all timers dont work anymore.

I also dont get any errors. Any advices where to dig? Thanks!

[Petter Myhre]

Are you using app timer? Or some other library for controlling the timer? What timer instance are you using? Timer 0 is used by the SoftDevice, so you can't use that.

[Sergy]

Im using app_timer, so its just RTC, not using TIMERx for this.

[Petter Myhre]

I see. I don't quite understand why this would happen. Maybe you could upload your complete project so I can test it here? Or a project that reproduces the behavior?

[Sergy]

its indeed something i cant understand either, spent a few days trying everything, but no luck so far. ive uploaded the full code to support center now, case id 32747.