Done:
To Do
Asked in btcpay support chat to make sure we can use the btc node in it on its own:
Yes, you can also use it as a full-node reliant wallet read a bit our docs.btcpayserver.org plenty of features and use-cases listed there. But btcpay is way more than just a payment processor, recently there was a tweet emphasizing some features and use-case
So I may as well install it and just use the bitcoin node at first. https://docs.btcpayserver.org/deployment/raspberrypideployment
FIrst, tried using services that redirect a dynamic IP - all a bit flaky and in any case too many re-directs with the DNS. Waiting for a static IP from Eircom... quite a rip-off. 50 EUR set up and 5 per month. [edit: Ordered static IP from Eircom but it never happened. Useless! So now I have to go with the dynamic ones instead.]
I tried the services where you can assign your own domain first, but couldn't get their update software to run reliably, so now trying the noip.com one with subdomain - following their instructions.
Installed snap
Installed noip-client (snap)
success... https://pinode.ddns.net/ now goes to my router - but not on to the pi - need to figure how to make it do that. (done)