let local_key = identity::Keypair::generate_ed25519();
let local_peer_id = PeerId::from(local_key.public());
let transport = libp2p::development_transport(local_key.clone()).await?;

// Create a Swarm to manage peers and events
let mut swarm = libp2p::Swarm::new(transport, Episub::new(), local_peer_id);

// Listen on all interfaces and whatever port the OS assigns
swarm
  .listen_on("/ip4/0.0.0.0/tcp/4001".parse().unwrap())
  .unwrap();

// subscribe to the topic specified on the command line
swarm.behaviour_mut().subscribe(opts.topic);
swarm.dial(bootstrap).unwrap()

while let Some(event) = swarm.next().await {
  match event {
     SwarmEvent::Behaviour(EpisubEvent::Message(m, t)) => {
        println!("got a message: {:?} on topic {}", m, t);
     }
     SwarmEvent::Behaviour(EpisubEvent::Subscribed(t)) => {}
     SwarmEvent::Behaviour(EpisubEvent::Unsubscribed(t)) => {}
     SwarmEvent::Behaviour(EpisubEvent::ActivePeerAdded(p)) => {}
     SwarmEvent::Behaviour(EpisubEvent::ActivePeerRemoved(p)) => {}
  }
}