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pi-mqtt-gpio
Expose GPIO modules (Raspberry Pi, Beaglebone, PCF8754, PiFace2 etc.) and digital sensors (LM75 etc.) to an MQTT server for remote control and monitoring.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If you install this on the RPI, https://github.com/flyte/mqtt-io setup the digital output to turn the relay on and off and add the HA discovery option, then it will show up as an MQTT switch in Home Assistant and you can turn it on and off from HA
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