This simple Automate flow plays custom alarm-like sound, when your phone receives a SMS message which contains “alarm” word in it.

It could be useful, when you want for example play custom alarm for specific server events. As it is SMS based, it will not require mobile data transfer turned on.

How to set it up? You will need Automate app to be installed on your phone. Then you can download and import the flow from here:
https://drive.google.com/file/d/1iKlIcS-Bs6I1ElPKeZkd0j9XPzrr1vyI/view?usp=sharing

or set it up yourself following the steps from this video: