If you do a search, you will find several discussions on the topic. I personally use the temp stick which is battery operated and simply monitors the temperature in conjunction with an AGS. Others use a security camera with a thermometer such as the CANARY. The issue you are going to experience is some of those security cameras require a subscription and also require a significant amount of bandwidth to upload... and that there lies one of the main issues, reliable internet to receive those remote alerts. Your best bet if going to be a cellular jetpack. I hope this helps a little and wish you the best of luck.
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