MQTT Blink1 Service

Controls a Blink1 via MQTT

Commands

color

$ echo '{
  "color": {
    "r": 0,
    "g": 0,
    "b": 255
  }
}' | mosquitto_pub \
  --url 'mqtts://user:pass@mqtt.example.com:8883/werkstatt/blink1/cmnd' \
  --stdin-file

blink

$ echo '{
  "blink": {
    "interval_ms": 80,
    "count": 3,
    "color": {
      "r": 0,
      "g": 0,
      "b": 255
    }
  }
}' | mosquitto_pub \
  --url 'mqtts://user:pass@mqtt.example.com:8883/werkstatt/blink1/cmnd' \
  --stdin-file

Iterate

Rust doesn't really cross-compile, so I rsync the source code to a Raspberry Pi (where this is to be running eventually) and execute there:

$ cargo watch -- zsh -c 'rsync --progress --exclude-from=.rsyncignore -r -e ssh ./ kiosk:workspace/mqtt-blink1/ && ssh kiosk "cd workspace/mqtt-blink1; killall mqtt-blink1; cargo run"'

The compiling machine must have OpenSSL dev headers. Check the paho-mqtt project for details.

TODO

• CI/CD pipeline
• allow overriding the client id
• find a simpler way to create the udev rules (see go branch)
• Integrate with Home Assistant as light (using auto discovery)

FAQ

Why Rust?

I used to run this in Ruby, but the library was never updated for Ruby 3.x. I could not fix it myself because I do not know enough about handling the native code parts. I tried go, but the cross-compilation incl. CGO gave me headaches, too. Finally, the Rust library worked totally fine.