ehco is a network relay tool and a typo :)
let's see some examples
relay all tcp traffic from
0.0.0.0:1234
to0.0.0.0:5201
ehco -l 0.0.0.0:1234 -r 0.0.0.0:5201
also relay udp traffic to
0.0.0.0:5201
ehco -l 0.0.0.0:1234 -r 0.0.0.0:5201 -ur 0.0.0.0:5201
TBD, for now, you can see more examples in ReadmeCN