I currently use innogy for all important devices, i.e. mainly thermostats that should not fail. But innogy is very much a closed system. Still, it works very reliable with OpenHAB.
As I plan some hardware investments, I should make a wise choice for the upcoming years. My impression is that HomeMatic IP is probably more popular, provides more devices and - this is the main point - both proprietary (CCU3, AP) and open source gateways (RaspberryMatic, viCCU) are available.
But I have the impression that the CCU/OCCU software follows rather old concepts. As a consequence, data exchange of system variables (“polling”) is limited to very slow cycles of around 30 seconds (see e.g. https://github.com/rdmtc/RedMatic/wiki/Faq#bis-Änderungen-von-systemvariablen-in-redmatic-ankommen-vergeht-sehr-viel-zeit-wie-kann-man-das-beschleunigen). This again looks like quite inconvenient: Say, you send a command to from OpenHAB to switch on a light controlled by HomeMatic, 30 seconds are too much. Updates of variables seem to be a general issue in HomeMatic, see also Homematic status refresh. Here, the binding looks like interfering with the Hue binding: Is the Homematic binding actively maintained?
Are there any experiecences in the community how well this works and if the limited poll capability creates issues in this context? Are there oither things I should consider, e.g. reliability? From innogy, I am very much used to a very simple usage scheme: Send and read values to the gateway, and immediately get a result. Probably, the innogy gateway is simply more efficient in polling…
Thanks for sharing your impressions!