Make the tcp server in the local network can be accessed in internet by using the turn server Protocol is referenced by rfc6062. But it is not rfc6062 implementation.
python3 -m my_turn.server [hostname]
# like
python3 -m my_turn.server www.mydomain.com
server is running on the internet, default listen port is 5555
python3 my_turn/client.py [host] [port] [lport]
# host turn server host
# port turn server port
# lport local server port
# like
python3 my_turn/client.py www.mydomain.com 5555 22
client is running on your local network server, lport is your local server which wanted to be accessed.
22
is default port of ssh service
If successful, client will get the relay-server port, and it will showed in server side too.
Then you can use ssh www.mydomain.com -p [relay-server port]
to connect your local server.