Being realistic, it’s not something I see gaining adoption, mostly because HTCPCP is a joke protocol and isn’t a complete spec. Any internet-connected coffee machine nowadays would probably go through a ZigBee proxy or similar, and talk some proprietary format.
This was on PM earlier, they were interviewing one of the named postmasters: she only found out about this leak when The Mail called for a quote.
As she said herself, there’s accident and there’s incompetence; this leans heavily to the latter.