Email Alert if Public IP address changes - Updated
This is an updated version of Paul Reed's flow which can be found here: https://flows.nodered.org/flow/9559f217b08913702c38.
I modified the flow slightly and it has worked flawlessly for a couple of years now. Until, that is, the address https://bot.whatismyipaddress.com/ stopped working due to being discontinued by https://whatismyipaddress.com/ because of "abuse" as stated on their website. It stopped working on November 10, 2021. So, I found a site that can return the same text results as http://bot.whatismyipaddress.com/. This new flow uses https://ident.me. This address can also be used with the original flow.
To paraphrase Paul: The flow needs little explanation, it obtains your current public IP address via https://ident.me but there are other services available - http://echoip.com/ and http://ipecho.net/plain (I haven't verified whether these services still work or not) and passes the result through a 'switch' node programmed only to accept data in the format of a IP address - regex validity check (thanks Nick). The IP address is then compared to the previous recorded IP address, and if they differ - then an email is sent to the email address provided, otherwise the flow ends.
I've set up this flow up to check every hour if the IP address has changed or not. Also, once a week it will reset the flow to an IP address of 0.0.0.0. This way, you can be sure that the flow is still working. That's how I knew it wasn't working anymore. I stopped getting the weekly emails.
Hope someone finds this helpful.
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