A RuuviTag -> MQTT bridge supporting Home Assistant MQTT discovery.

Based on the excellent EspruinoHub and very much a work in progress.

Ideally use a Raspberry Pi 3 or Zero W, as these have Bluetooth LE on them already. However the BLE USB dongles mentioned in the Puck.js Quick Start guide should work.

• Download Raspbian Lite from https://www.raspberrypi.org/downloads/raspbian/
• Copy it to an SD card with sudo dd if=2017-11-29-raspbian-stretch-lite.img of=/dev/sdc status=progress bs=1M on Linux (or see the instructions on the Raspbian download page above for your platform)
• Unplug and re-plug the SD card and add a file called ssh to the boot drive - this will enable SSH access to the Pi
• If you're using WiFi rather than Ethernet, see this post on setting up WiFi via the SD card
• Now put the SD card in the Pi, apply power, and wait a minute
• ssh pi@raspberrypi.local (or use PuTTY on Windows) and use the password raspberry
• Run sudo raspi-config and set the Pi up as you want (eg. hostname, password)

# Install Node, Bluetooth, etc
sudo apt-get update
sudo apt-get install git-core nodejs nodejs-legacy npm build-essential mosquitto mosquitto-clients bluetooth bluez libbluetooth-dev libudev-dev
# Now get puckjs2mqtt
git clone https://github.com/ppetru/puckjs2mqtt
# Install puckjs2mqtt's required Node libraries
cd puckjs2mqtt
npm install
# Optional - enable gathering of historical data by creating a 'log' directory
mkdir log
# Give Node.js access to Bluetooth
sudo setcap cap_net_raw+eip $(eval readlink -f `which node`)

You can now type ./start.sh to run puckjs2mqtt, but it's worth checking out the Auto Start section to see how to get it to run at boot.

There are a 2 main ways to run puckjs2mqtt on the Raspberry Pi.

This is the normal way of running services - to configure them as a system start-up job using systemd:**

    sudo cp systemd-puckjs2mqtt.service /etc/systemd/system/puckjs2mqtt.service

and edit it as necessary to match your installation directory and user configuration. Then, to start it for testing:

    sudo systemctl start puckjs2mqtt.service && sudo journalctl -f -u puckjs2mqtt

If it works, Ctrl-C to break out and enable it to start on login:

    sudo systemctl enable puckjs2mqtt.service

If you have a video output on your Pi then you can run puckjs2mqtt at boot - on the main display - so that you can see what it's reporting.

• Edit .bashrc and add the following right at the bottom:

if [ $(tty) == /dev/tty1 ]; then
  while true; do
    puckjs2mqtt/start.sh
    sleep 1s
  done
fi

• Now run sudo raspi-config, choose Boot Options, Desktop / CLI, and Console Autologin

• Next time you reboot, the console will automatically run puckjs2mqtt

TBD