You wouldn't ship your entire microservices backend as a single statically-linked binary running as root on an unpatched server, right? Yet that is exactly the architecture running on embedded devices everywhere — from smart-home sensors to industrial controllers. Embedded firmware is stuck in the pre-container era — unisolated, un-hot-swappable blobs. This is the first post in a series on WANTED, a new general-purpose cloud-native runtime for embedded devices.

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Siphon v0.5.0 introduces the critical new feature for a gateway app: zero-downtime hot reloading. A powerful new integration is also showcased — using tailscale funnel and the {API}Call Garmin widget to securely bridge a watch to Home Assistant via MQTT, without exposing a single port on my router.

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With the release of the v0.4.x series, Siphon has officially outgrown its initial "script replacement" phase. I have completely stripped and rebuilt the core memory bus, introduced a highly opinionated v2 declarative schema, and, most importantly, packaged the entire engine as a native Home Assistant Add-on.

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If you are exposing your Home Assistant instance directly to the Internet, you are playing Russian roulette with your local network. It only takes one zero-day vulnerability in a custom integration to give a botnet full access to your smart home and everything else on your LAN. But we live in a connected world. You still need a way for external services—like a GPS tracker on your car, a webhook from a Garmin watch, or a custom script running on a remote VPS to push data into your home.

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