Hey Ken! Is your real name McGyver!
I have read and re read articles on monitoring devices and we settled on Canary.....their support is great,it is eaily configured and does not use your phone daya unless you want to login and get video along with your temp/humidity stats. It is wifi with a phone app, notifies your phone of any issue, easy to learn but takes practice as far as settings and it's caoabilities! You can also invite anyone you choose and they can monitor also. So far it is working flawlessly ar home and our local campsite....there is a video out there by rv bloggers and they use hotspot while boondocking and say they have great issue. It s nice too in that it configures itself to local emergency services so that if there was an issue you push the alarm button and it summons them to your address or site!