Hi Frank,
I am not sure how it would work with two circuits… but if the boiler has two room setpoints, that might explain why the constant or temporary room setpoint override doesn’t work. With this binding though, I am limited to the features of the OTGW device. And as far as I know, it doesn’t support overriding two separate room setpoints. At least, not with the standard firmware.
If you check the OTGW site with the link I provided earlier, you will see all the commands the OTGW device supports. Some commands are mapped to channels, like temporary and constant override, but any command not mapped to a channel can always be set through the generic “Send command” channel of the binding.
Please check if you can get the setup working with just the OTGW device and OTmonitor or telnet or something… to find out whether the issue is with the binding or the hardware.
Regards
Arjen