Magic Wormhole Transit Relay
Run via Python environment:
pipenv install magic-wormhole-transit-relay
pipenv shell
twist transitrelay
Make sure TCP port 4001 is allowed in the firewall. E.g.
sudo ufw allow proto tcp from any to any port 4001
Then use
wormhole --transit-helper=tcp:your.host:4001 send somefile.md
wormhole --transit-helper=tcp:your.host:4001 receive ...