(Question) Example for substreams

[elbaro]

According to this stackoverflow,

you generally dial other peers using the switch interface, which will give you a stream to read from and write to,
...
the switch will just use the existing connection and open another muxed stream over it,
...

As I understand this, we can dial multiple times to get multiple substreams on one TCP connection. However libp2p::Swarm::dial_addr(..) does not return a stream. StreamMuxer has open_outbound method but I am unsure how to use this to create several substreams and pass these to Swarm::new.

Can we have an example using several substreams?