Sound Monitor

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sudo apt-get install netdiscover rrdtool

# generate ssh keys
ssh-keygen

Discover RADXA

sudo netdiscover
...
192.168.2.44    ac:a2:13:42:1c:14
...

Upload key to RADXA (password is rock)

ssh-copy-id 192.168.x.y

Connect to RADXA

# user rock, password rock
ssh rock@192.168.x.y

Copy database

scp rock@192.168.x.y:~/monitor/db.rrd /tmp

Generate graph

/home/rock/monitor

run

sudo systemctl stop monitor

/etc/systemd/system/monitor.service

[Unit]
Description=Monitor

[Service]
Type=simple
User=rock
ExecStart=/usr/local/bin/monitor_run

[Install]
WantedBy=multi-user.target

Enable

systemctl enable vgaoff.service

PC