Remote openHAB Binding

Hi there,

I hope someone can help me with setting up the remote binding.
I want to get some items from my live OH2.5 system into my OH3 test system.

When copying remoteopenhab.things - which contains:

Bridge remoteopenhab:server:oh2 "OH2 server @Raspi3b" [ host="192.168.178.31", port=8080, useHttps=false, trustedCertificate=false ] {

}

into things folder, I’m getting this error:

Thing 'remoteopenhab:server:oh2' changed from UNKNOWN to OFFLINE (COMMUNICATION_ERROR): Failed to get the list of remote items using the items REST API: java.util.concurrent.TimeoutException

What do I need to provide in order to get it working?