The relay client used to exchange tunnel messages with the peer.
ID of the relay client on the other end of the tunnel.
OptionalproxyProxy protocols accepted by the listener. The protocol is detected independently for every incoming connection.
OptionaltargetFixed destination for raw forwarding, in the form host:port or an
IHostPort object. Omit it when each tunnel request supplies its
own destination, as in HTTP-proxy mode.
Options accepted by RelayTunnel.