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Being fairly new to home networking, this took me hours to crack... but no doubt common-sense to most of you on here :)

Requirement:  iPhone OpenVPN client to use local OPNsense DNS arrangements (Adguard etc).

Solution: set "DNS Servers" under OpenVPN Servers to "10.10.0.1" - or whatever the IP address is of the local OpenVPN server.

No other changes needed... I thought it would just work with 192.168.1.1 - and tried everything such as push-option DNS etc...

Also explains why I was getting "reply from unexpected source" response when using nslookup from my iPhone (when forcing 192.168.1.1 DNS). 

Home Assistant has an Integration called "Ping (ICMP)" that when installed can be used to create an automation triggered if the internet connection goes down.   Simply add Device - Ping (ICMP) once you've added the Integration.

I'm using it to switch on a 4G router with WIFI - at least until I have time to properly figure out the right way to implement dual WAN!