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I overlooked a part of the v7 manual about the easy esp settings in the wifi module. I entered the values that were mentioned in the manual and that worked.
I am a bit disappointed though as my heatpump shows only a little data. The heatpump was not on the list so nobody is to blame

Meanwhile, I have it working with Easy ESP, thanks for your time

So you have a Wemos D1 mini, not an actual NodeMCU? It doesn't really matter much, except that the Wemos D1 mini doesn't have a FLASH button to confuse you. On both devices you don't need it. The device can be put into flash mode via the USB interface, without any manual action. You should just be ...

The ESP easy firmware is general purpose firmware. As a result it has lots of settings you have to get right to work correctly with the OTGW. This is why the OpenTherm Gateway Manual provided by the Nodo Shop suggests to use firmware that was created specifically for the OTGW: https://github.com/rv...

I have both NodeMCU and OTGW working seperately, but cannot connect the OTGW to NodeMCU. I used several combinations. The NodeMCU has connected to Wifi, that works. It has an IP address I can OT Monitor connect to OTGW through the COM port, that works. But when I plug the NodeMCU on the OTW board an...