Hello! Are you there?
If you look at a CHIP sitting on your desk/closet/whatever you probably have no idea if it's connected to the network. This is a simple script to blink the secondary LED to indicate network status. It also does a great job as a general-purpose visual heartbeat, so you know the OS/ userspace is still alive!
Under default settings, the script runs as a daemon and blinks the LED 3 times in quick succession if the network is unreachable. If the network is OK, you will see a very short 'blip' on the LED every 5s to indicate the daemon is still alive and connection is good!
The script has exactly two dependencies: bash and ping. It might work
in zsh as well and probably with dash/ busybox sh.
Customize the $TEST_COMMAND variable if you want to use another method
to test network status instead of ping.
This could be modified to run once and exit so it could be scheduled as a cron job. However you'd have to watch the LED for up to 1m to wait for it to run. Instead there's an install script and systemd unit file. See install.sh. Once installed it will run on startup. The script itself does not of course rely on systemd, you could instead invoke it in sysV init or upstart as well. The main CHIP distro just happens to use systemd.