Cloud MQTT→Supabase ingestor for plant sensors.

Consumes the Homey MQTT Hub (Homie convention) topic tree and writes readings to Supabase.

Subscribes to MQTT_TOPIC_BASE (default homie/homey/#). Each device publishes bare values on per-capability topics:

homie/homey/<device-slug>/measure-moisture     -> e.g. 61.5
homie/homey/<device-slug>/measure-temperature   -> e.g. 23.4
homie/homey/<device-slug>/measure-battery        -> e.g. 100
homie/homey/<device-slug>/$name                  -> friendly name (captured for hw_name)

Homie $-metadata topics are ignored (except the device-level $name). Because values arrive on separate topics, the worker buffers each device and, after a short quiet window (ASSEMBLE_WINDOW_MS, default 2000ms), inserts one combined row into readings.

fertility, light_lux, rssi, probe_type are not provided by these sensors and are written as null.

Env vars

• MQTT_URL, MQTT_USERNAME, MQTT_PASSWORD
• MQTT_TOPIC_BASE (default homie/homey/#)
• SUPABASE_URL, SUPABASE_SERVICE_ROLE
• DEFAULT_PLANT_ID (unknown devices auto-register here)
• ASSEMBLE_WINDOW_MS (optional, default 2000)