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If you are stuck, start with the help page.
Note: some of these pages may be dated: YMMV! Please do feel feel to update anything that you think could be corrected / improved.
This is a HA custom component that works with some Honeywell RF-based systems such as Evohome, Sundial, Hometronic, and many others.
The forum for help/feedback is: https://community.home-assistant.io/t/honeywell-evohome-via-rf-hgi80-hgs80/151584
The simplest way to know if it will work with your (868 MHz-based) system is to identify the box connected to your heat source equivalent to one of (there will be other systems that also work):
- R8810A: OpenTherm Bridge
- BDR91A: Wireless Relay
- HC60NG: Wireless Relay (older hardware version)
It requires a serial-to-RF devices, either a Honeywell HGI80 (rare, expensive), or a USB dongle running evofw3.
It uses the ramses_rf client library to decode the RAMSES-II (Room Apartment Manager System Engineering Specification) protocol used by these devices. Note that other systems, such as HVAC, also use this protocol, YMMV.
Fan systems from Orcon and IthoDaalderop are also known to use the Honeywell RF-based system. Support for these fans is a work in progress and currently only supported via the bleeding edge releases.