Opentherm + ATAG One

I try to get the Opentherm Binding to work with the very popular ATAG One Controller which is based on Open Therm. Somehow the connection will always been rejected from the ATAG One Controller.

2019-01-15 18:40:37.456 [INFO ] [eway.handler.OpenThermGatewayHandler] - OpenTherm Gateway connector started
2019-01-15 18:40:37.457 [INFO ] [eway.handler.OpenThermGatewayHandler] - Connecting OpenThermGatewaySocketConnector to
2019-01-15 18:40:42.480 [ERROR] [eway.handler.OpenThermGatewayHandler] - An error occured in OpenThermGatewaySocketConnector: connect timed out

With the atag-one.jar (, developed from Rob Juurlink the communictation over Port 10000 works perfect and how it should be.

Anyone an idea why i can’t get the Opentherm-Binding connected on the ATAG One Controller?

…any ideas are welcome!

Thanks and a great Evening!

@Bernhard_Sailer. The Atag-One is not what is meant with “Opentherm gateway”. That is a dedicated piece of hardware sitting between an Opentherm compatible thermostat and the boiler. With the Atag-One you do not need that, because it has its own wifi interface. that is what you use with the Atag-One api from Rob Juurlink.
The Opentherm gateway was designed for themostat without this possibility and are often home built bij electronics hobbiists.


If you are interested,
has a full description and a picture.


Thank you