Tmate

Instant Terminal Sharing (https://tmate.io), Teamviewer like for SSH

Once installed, simply launch tmate with tmate.
Run tmate show-messages in your shell to see tmate's log messages, including the ssh connection string.

ssh-keygen generate on start with no password
tmate command line aded to NAS $PATH

tmate show-messages will disaply you different URL to use over HTTPS or SSH Client

if you like it do not forget to donate ;)