- Syncs ALSA volume (same volume slider as in
alsamixer) with MQTT - Publishes state of device to MQTT usually from
/proc/asound/card0/pcm0p/sub0/status
Use this to react to changes in volume or to change the ALSA volume by external events.
dersimn/SoundPi/online → true
dersimn/SoundPi/status/device-in-use → {
"val": true,
"state": "RUNNING"
}
dersimn/SoundPi/status/volume → 21
dersimn/SoundPi/set/volume ← 42
apt install build-essential git libasound2-dev
git clone https://github.com/dersimn/alsa2mqtt
cd alsa2mqtt
npm i
See node index --help
alsa2mqtt 0.0.2
Control ALSA volume from MQTT
Usage: index [options]
Options:
--prefix [default: "dersimn/SoundPi"]
--alsa-card [default: "default"]
--polling-interval polling interval (in ms) for status updates
[default: 3000]
--version Show version number [boolean]
-h, --help Show help [boolean]
-v, --verbosity Possible values: "error", "warn", "info", "debug"
-u, --mqtt-url mqtt broker url. See
https://github.com/mqttjs/MQTT.js#connect-using-a-url
-m, --alsa-mixer [required]
-s, --alsa-status-file [required]
Example:
node index -v debug -u mqtt://10.1.1.100 -m Line -s /proc/asound/card1/pcm0p/sub0/status
Copy alsa2mqtt.service to /etc/systemd/system/alsa2mqtt.service, and edit parameters in ExecStart, then:
systemctl daemon-reload
systemctl enable alsa2mqtt.service
systemctl start alsa2mqtt.service
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