@sundberg84 Yes, the patch will be included in 2.3.1.

@mfalkvidd , yes, I see. As I wrote in the first post I was using https://github.com/mysensors/MySensors/tree/development/examples/SecurityPersonalizer code. I checked with the Personizer code in the Library examples - it does compile, thanks. What I find a bit confusing - in the sketch in exampla library you have to make two keys - USER_SOFT_KEY and USER_KEY (when you do not use hw hashing, and when you do). I have mixed configurations. Should those keys be the same in my network for mixed configuration to work? thanks for help and sorry for confusion

I agree with TimO We are discussing the solution of same problem on https://forum.mysensors.org/topic/3346/discussion-reliable-delivery/48 Feel free to watch that. i am also using OpenHAB.

I did some looking on this a while back and found this external solution https://github.com/mattbornski/Arduino-Watchdog-Circuit . It is a hardware watchdog timer based on a 555 timer IC.

@tbowmo works like a charm, thank you.