With some support of Jiri I managed to get the gateway up-and-running on an esp8266 wemos mini pro d1!
The advantage of the wemos in comparison with arduino is its low cost, size, speed, power usage and standard wifi functionality including an option to add an external antenna. ( e.g. https://www.hobbyelectronica.nl/product/wemos-d1-mini-pro/ ) To make this work I ordered a arduino proto board to click in the gateway shield and solder it to the wemos. Some small adaptions on the shield make it work on the 3.3V platform of the esp8266.
I managed to see every command the thermostat sends to the boiler and I can capture the feedback of the boiler.
My next steps are - add display to wemos to see current state of the boiler, thermostat, and show connections are good. - use the wifi link the data to my sql database running on my NAS (I know this works already) - readout 2nd thermostat (on/off) via input and enable boiler via the opentherm - get everything nicely in a box e.g. add 24V supply and nicely enclose it - build a web-access to from outside enable boiler or readout temperature
- experiment further with opentherm commands * e.g. make sure the thermostat always has the right date/time (via internet time server) * add external temperature sensor etc. etc.
If more people have interest, maybe Jiri will develop a shield that fits standard for Wemos ? Anyhow this is a good product with good support and can be fun and useful to save energy costs!
One of the first things that struck me about the Arduinoflake upon opening was the care which it had been packaged and parts labeled, and the quality of everything included. I immediately decided to order several more for kits for gifts.
This was a great kit. Packaging and documentation was awesome with every part labeled in a unique way with step by step instructions. Even extra components included! I did look up what the interior of a LED looked like so I was sure which way they went. This was my first smd project. Man some of those smd's are tiny. Don't sneeze. It works great and I love the touch pad. I posted so my Christmas friends would see this.
Thank you! I am really glad you like it. I always try my best to provide the best experience. This is a total win! Awesome that your first SMD project is Arduinoflake. That is also one of the reasons I include extra components - they are tiny and easy to lose.