@marsault6 I prepared a pr, referenced from the issue, that fixes the crash at my setup. It's not the optimal solution, but seems to do the trick. If you're handy with installing your own libraries you could give that a try. Update: the fix has now been merged into development: https://github.com/mysensors/MySensors/tree/development

Mysensors has a "savestate" function that can be used to save variables in eeprom without too much hassle, but in your case it since it is a mains powered node you could just report every pulse and have the controller save the data and when node boots it will just asks Domoticz the last pulse count (look at energy pulse meter example in library) but I think that will work only if using mqtt gateway as for the ethernet it will just miss the retrival of the pulse count because the controller takes some time to connect to the ethernet GW. As an alternative there are other solutions like ESPEasy that have already some built in funtions easy to use without need to do lot of coding.