Using REST-API for vcontrol

Hello everybody,

I’m playing arround with OH2 for a while and was fascinated about the possebilities. My latest projekt is to connect the Viessmann-heating with vcontrol. vcontrol is running on adifferent raspi and works quite well. A little javascript (vMon) is reading the values from the vcontrol deamon and will send it to OH REST-API. At that point lays my problem:
vMon could not connect to the rest server:
“Could not connect to rest server” What did I wrong? Is it the right URL? What have I to do on Openhab without creating items responding to the vcontrol commands?
I would be verry happy about any hints.