rapt-mqtt-bridge
Python script which accesses RAPT IoT RESTful API to read data from RAPT Pills and publish recent updates on MQTT
RAPT Pill
An inexpensive, battery powered, WiFi liquid density meter used for brewing beer and other fermentation liquids. It is very similar to the iSpindle but refined by KegLand in Australia. For more information, see Yellow RAPT Pill - Hydrometer & Thermometer.
To order one from outside of Australia, see the RAPT Pill on Kegland's Aliexpress store
Once configuraed properly, the RAPT Pill will send its data to its IoT data collector. This script uses the RESTful API for this data collector to then fetch the data, parse it and then publish as a MQTT message.
Kegland makes other RAPT devices that send their data to https://app.rapt.io. This script currently only supports the RAPT Pill. However, this repo can be forked and easily expanded to gather data from other RAPT sources using this code as an example.
MQTT
MQTT is one of many IoT sensor transport protocols. It is a convenient way to send sensor data from various sensors in your local network to home automation systems like Home Assistant or to an InFlux Database and then use Grafana to graph. In fact Home Assistant can be easily configured to subscribe to the MQTT data, act on it, if need be, and then pass on to an InfluxDB that can be accessed from Grafana.
Run as Cron job
To have this script automatically run after bootup, configure it to run as a cron job.
On Linux, use the command:
crontab -e
Then in the editor, add to the last line:
@reboot /bin/bash -e <path_to_rapt-mqtt-bridge>/rapt-mqtt-cron.sh
Then edit rapt-mqtt-cron.sh in this repo and choose the arguments
that you desire. The reason to run under a specific user instead of
root is because several environment variables must be setup. It may be
better to set them up under a user besides root but it is up to
you. Be sure to put them in your $HOME/.profile file since some
$HOME/.bashrc files do not execute if not an interactive shell.