Automagic

Automagic is an event-driven automation daemon and app.
It hooks directly into the system and session D-Bus or MQTT Brokers to monitor hardware and OS-level events. It can also use timers to poll HTTP API endpoints or subscribe (and publish to) MQTT brokers.

Users can define custom Data Sources, Triggers, Actions, and Flows to create automated routines. It currently supports D-Bus, MQTT, and HTTP sources and actions.

While it's built for Sailfish OS, the daemon binary is perfectly happy running on a Raspberry Pi, so it doesn't technically have to be a phone at all.

Warning: Very experimental. The daemon runs as root. Use at your own risk.