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Solved: I found another forum post where somebody mentioned port 25238. Using socket://192.168.1.138:25238 worked!

Just to follow up. I'm able to telnet to the OTGW on port 23 using Putty and also connect OTmonitor.exe via LAN. enabling loggin in HA, I do see the following error when trying to activate the OTGW integration: 2021-12-24 22:37:21 ERROR (MainThread) [pyotgw.pyotgw] Could not connect to serial device...

I just received my OTGW with WeMos D1 from nodo-shop.nl/ and after putting it together and configuring the Wifi, I connected the themostat and boiler and by the looks of the logs of the webinterface (http://otgw.local) it looks like its all connected. However when trying to add the integration to Ho...