README.md

Assuming the script is located in ~/crontabs/, this needs an edit in the crontab file:

HOUSE_POWER_CHECK_DEPLOYMENT_ID="<INSERT HERE THE DEPLOYMENT ID FROM GOOGLE APP SCRIPTS>"
*/10 * * * * ~/crontabs/house-power-check-heartbeat.sh

It's also helpful to have in the /etc/logrotate.conf the following:

/home/<YOUR HOME>/crontabs/house-power-check-heartbeat.log {
  daily
  rotate 2
}

house-power-check-heartbeat.sh

#! /bin/bash

OUT=$(curl -L "https://script.google.com/macros/s/$HOUSE_POWER_CHECK_DEPLOYMENT_ID/exec?type=heartbeat")

if [ "$OUT" = "{\"status\":\"OK\"}" ]; then
  echo "Heartbeat OK" >> ~/crontabs/house-power-check-heartbeat.log
else
  echo "Hearbeat failed!" >> ~/crontabs/house-power-check-heartbeat.log
fi