Couple of options. If you have a VPS you could install something like Nagios and do passive updates. Set a stale threshold and have the stale check report as a warning.
I have multiple wifi sensors that boot, perform their function, then go into deep sleep for a set time. I set up a passive service type that changes the status to unknown with the message "data acquisition failure" if the stale threshold is hit.
Couple of options. If you have a VPS you could install something like Nagios and do passive updates. Set a stale threshold and have the stale check report as a warning.
I have multiple wifi sensors that boot, perform their function, then go into deep sleep for a set time. I set up a passive service type that changes the status to unknown with the message "data acquisition failure" if the stale threshold is hit.