My guess is someone saw what was being built and said "hey, we can build something similar and sell it", hence the C&D.
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Still a ridiculous move. If I buy an appliance, I pay for it and I own it. I am allowed to do with it whatever I want. If I want to use my own solution for controlling it, hosted on my own server, I should have every right to do so. Fuck corporations and their shitty cloud solutions.
The developer commented the following:
Luckily I'm insured. I've contacted my legal expenses insurance and they're covering a lawyer for the case. I will seek advice and see how an expert assesses the situation and then proceed.
Tldr, They are going to fight this!
Source: https://github.com/Andre0512/hon/issues/147#issuecomment-1892738060