Send BLE sensors data to MQTT

Why transmit this to mqtt?

• We may need several bluetooth radios to get decent coverage, as BLE is not a mesh network.
• We decode the data locally, to save on data sent to mqtt. There are a lot more devices that may broadcast BLE signals and this is a problem if you live in an apartment.

A service to read Bluetooth low energy sensors in nodejs.

• nodejs v12 (brew install node or using nvm)
• yarn (npm i -g yarn)
• a Bluetooth modem capable of BLE

• LYWSDCGQ Mi Thermohygrometer, powered by 1xAAA
• HHCCJCY01 Mi Flora, also available from a lot of other brands, powered by 1xCR2032
• CGDK2, a newer version of the Mi Thermohygrometer, powered by 1xCR2430
  • For this device to broadcast useful data, a pair to the official Qingping app was needed

Before running this, keep in mind that this was tested with ubuntu and macOS in mind.

To run this in macOS (Prior to Monterey):

Go to System Preferences > Security & Privacy > Privacy (tab) > Bluetooth and add your terminal of choice to the list of allowed apps.

To run this in ubuntu/other gnu/linux distro:

./setup.sh

First, configure your mqtt server

cp .env.example .env
vim .env

There are a few things to configure in the .env file:

To install dependencies run the service, just:

yarn && yarn start

• Docker image

• Docker Compose with full example

• Prometheus exporter