Migration from OH 2.5 to 4.1

[sherif (Marcin)]

@rlkoshak

OH 2 introduced a whole new architecture for bindings that enables automatic discovery of devices. So it’s not new. What is new is as of OH 3 support for OH 1 style add-ons was dropped. You must configure and use 2.x style bindings in 2.x style ways which means Things, Channels, Links and Items.

If you still have some OH 1.x style configs in your .items files, you’ll have to replace those with the creation of a Thing and linking the Item to a Channel on that Thing.

Thanks Rich !
Thas what I missed when I read manuals. Maybe I was wrong and thought that there were two methods of config, and when I did via web, text file was updated. Now is clear, as I got lost with bindings and confg files.

@rlkoshak

Notice it’s defined as GWC_Auto_Time. Case matters.

Ahh, yes. Thats correct. Probably it was NO working last years, but OH4 warn me about it

@rlkoshak

It was a choice made by the binding authors who may or may not have been the same authors who wrote the 1.x bindings you were using. You can apply a transform profile between the Channel and the Item to map ON to OPEN and OFF to CLOSED and link these Channels to a Contact Item if you need to. Or just change your Contact Items to Switch Items.

Thats strange that idea of bindings was changed. I have switched all contacts to switches, but then I lost proper icons visibility. Where I can find “build-in” icons ? In /openhab/icons/classic I cannot find different version ie doors (open, close) which now I need to change to on/off. I mean all that can be find here: Icons | openHAB with certain variants.

@rlkoshak

An RPi 3, we are seeing, is probably not sufficient to run OH 4 unless it’s a modest configuration with little else running on the machine.

Thats interesting, so do you mean that during those years OH is now such hardware performance demented ? I had RPI2 vB with 1G and it works great with OH2.5. Now I have deployed the newest RPI3 4GB for OH 4.1 (60 rules, 310 items). The rest config is same, influxdb, OpenVPN server.
Yesterday I got ca 20 similar notification, but Today they gone … also I noticed that sometimes UI and basic interface are not responding or refreshing need some time. Never has such issues with OH1/2.

@rlkoshak

In general, it’s better to cast a Number Item’s state to Number instead of DecimalType. Your parens are a little odd though. And it’s better to use the postUpdate function on the Item where possible. Also avoid primitives and forcing the types of variables in Rules DSL unless necessary.

I solved all of those by changing to Number.
I also noticed some problem with command execution, different time syntax and notification syntax.
It took long time to find out all of those.
I still could not solve a problem with rule that restart openhab process. I have read Beginner's guide to an openHABian reboot/shutdown switch
and it works for system reboot, but I am not able to do it with OH process:
executeCommandLine("service", "openhab", "stop")
with SUDO or without it doesnt work.
EDIT: I forgot about Exec binding, after I added commands works.