I have a 4g modem at home and I would like to get notified when it goes offline. No these 4g modems do not support static Ip so having something like uptime robot unfortunately is not possible. Is there another way to get this to have some form of outside ping monitoring without a static IP? I tried setting up ddns on 4g modem but didnt seem to work..
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.