[throw0101b]

TIL:

> OpenTherm (OT) is a standard communications protocol used in central heating systems for the communication between central heating appliances and a thermostatic controllers.[1] As a standard, OpenTherm is independent of any single manufacturer. A controller from one manufacturer can in principle be used to control a boiler from another. However, OpenTherm controllers and boilers do not always work properly together. The OpenTherm standard comprises a number of optional features and some devices may include manufacturer-specific features. The presence or absence of such features may impair compatibility with other OpenTherm devices.

* https://en.wikipedia.org/wiki/OpenTherm

* 2.2 spec PDF: http://files.domoticaforum.eu/uploads/Manuals/Opentherm/Open...

* https://www.opentherm.eu