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Doesn’t .com mean “commercial” and that doesn’t fit his project at all.
Go to Namecheap.com and play around with their domain generator. There’s plenty of none-ccTLD’s to choose from.
Depending on the project, you could find a gTLD that fits your project.
.tech .dev .app …etc
I use a Ubiquiti doorbell, which operates locally. However you do need some extra equipment to set it up.