I've been following this thread for days when problems started as I was having the same issues. Fortunately I'm now able to control my heating systems from HA again, but not thanks to Viessmann, but tireless work from github guys, much appreciated! Fine, I'm not a paying customer for the REST API that Viessmann provides, my phone app started working again after resetting communication module, joining my wifi networks again, probably forgetting something that an ordinary consumer even does not have to know. Don't blame smarthome enthusiast that it is their fault being dependent on consumer market cloud solutions. In fact, they should be involved and their opinions do matter! Should I change my heating systems, as some have said here? I don't want to, integration should be simple and available to everyone. I've saved much on monthly bills over the years thanks to automation... not starting about the transition to green economy. So Viesmann please don't hang up your boots ( @Oberstdorf 🙂 and provide some support to those in need!
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