Trying to setup duckdns in orde to have SSL connection so that it will be safe (I hope so) to connect HA to the outside world.
Everything is fine running setup as instructed on the duckdns website.
but something is wrong in the code, it says “curl: no URL specified!”
the command is as follows: echo url=“https://www.duckdns.org/update?domains=xxxx&token=xxx” | curl -k -o ~/duckdns/duck.log -K -
I searched for a solution, couldn’t find one. Anybody here that can help me out?
Maybe a stupid question but instead of the xxxxx in the update command you added your duckdns URL and the token that was provided, right?? 
of course
Maybe you can try to run this command:
/usr/local/bin/curl "https://www.duckdns.org/update?domains=mysubdomain&token=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx&ip="
Found this here
I use EntryDNS and I use a similar update script - and it works for me:
curl -k -X PUT -d "" https://entrydns.net/records/modify/TOKENfound it, used nano insted of vi like described on this page Guide: How to set up DuckDNS, SSL, and Chrome Push Notifications and it works like a charm now