Error in HA trying to connect to RCT device

[maximilianwanzl]

Hello.
I recently discovered this fantastic integration.
The RCT HF-A21 is online and I can open its website (connected over LAN, showed in Fritzbox). When I do enter the LAN IP in the HA configuration, default port - I do get a
"Translation Error: The intl string context variable "hostname" was not provided to the string "Failed to connect to {hostname}:{port}."

The slave RCT connects correctly over Wifi to the LAN IP Adress of the Master, so the port seems to be o.k.
Do you have any hint?
Thank you

[weltenwort]

Sorry to hear you're running into problems. Do the HA core logs show any additional network error at the same time?