Hello,

I got an OpenTherm Gateway from nodo shop, pre-soldered and configured. I plugged it in and configured the wifi. I struggled to set up the OpenTherm Gateway integration in Home Assistant though. I used nmap to check which ports were open (80 and 23) and I set the address of the OTGW to socket://192.168.50.207:23 (the IP is static of course). It keeps telling me it failed to connect, I tried without port, without socket://. I can connect to it from the otmonitor Windows utility, and I was able to configure and use it with MQTT in Home Assistant, but I would prefer to use the OpenTherm Gateway Integration. I am not sure how to get it working though...

Log entry:

Logger: pyotgw.connection
Source: runner.py:289
First occurred: 1:31:11 PM (2 occurrences)
Last logged: 1:32:07 PM

The serial device on socket://192.168.50.207:23 is not responding. Will keep trying.

HA Info:

Installation method
Home Assistant OS
Core 2025.11.2
Supervisor 2025.11.2
Operating System 16.3
Frontend 20251105.0

OTGW firmware:

Firmware name Version Size
diagnose.hex 2.1 9196
gateway.hex 6.6 26996
interface.hex 2.0 10488