Sometimes i do need browser and i got magicmirror who uses it.
cannot find nothing in startup script
this is sample of this script
https://github.com/domoticz/domoticz/bl ... omoticz.sh

There is no GUI in Domoticz. Nothing that uses any graphic resources on the host that is. All it has is a web content server that allows a web browser to combine information from the Domoticz server into something that one could consider a GUI but is usually referenced to as a web front end. Yes ...

i want to be able to connect to it from other devices without running client side (GUI , web page) on Rasberry PI.

No, I want to be able to it with other devices, I just don't want it to open on raspberry pi because I am running something else on it.

How to run Domoticz on start without GUI , only server daemon ?
On Raspberry PI .