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Engineering stories

Engineering stories

What we set out to build, what we found, and what we changed our minds about.

Sovereignty is not a cupboard Owning your data is about who can read it, change it, take it away and rule on it — not which room the hardware is in. Those are two independent axes, and only one of them needs the house. sovereigntyhostinghome-assistant 28 August 2026 Out of the house first We moved an established Home Assistant out of a Swedish house and onto hosted infrastructure while the house kept heating itself. 83 of 101 integrations came back — and the 18 that didn't sorted into a pattern worth knowing. migrationhome-assistantnetworkinghomelink 19 August 2026 A bulb that would not join One IKEA bulb, and a border router that was healthy the entire time. Chasing why Home Assistant could not see it took us off Thread entirely and into the tunnel underneath — and the evidence that turned it was that nothing had been auto-discovered in seven months. matterthreadnetworkingengineering 28 August 2026 Four megabits on a three-hundred line We set out to put a hosted Home Assistant on the same LAN as the house. We found a tunnel measuring itself, an MTU with no legal value, a firewall judging traffic it was never written for, and three faults that could only fire at boot. networkinghomelinkengineering 28 August 2026 Isolation that fails closed A shared-bridge firewall was dropping real packets and was still the wrong design. We measured per-VM bridges, policy routing and VRFs on this host, and namespaces won — not because they are cheaper. Every tenant is now on its own stack, and moving the last two found four faults that doing it by hand had missed. networkingsecurityisolationengineering 28 August 2026

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