Domoticz

hello everybody

is there any way or tool to access an RPi with domoticz installed, from anywhere on internet, when we can not purchase a static ip address for it?

I think you have to look into something like dyndns.

https://www.zerotier.com/

ZeroTier combines the capabilities of VPN and SD-WAN, simplifying network management.
It's free and it works great for me

It's free and it works great for me

could u plz tell me a brief description about how to use it

It's simple, see the video or the tutorial
https://www.youtube.com/watch?v=lFmeF5xoAPI
https://pimylifeup.com/raspberry-pi-zerotier/

You don't need to open any ports.
Your Raspberry server can talk to any phone or computer that has a zerotier application and belongs to a private network.
It is safe