How to use libp2p to let Alice, Bob and Charlie chat in a group?

[Lebei2046]

┌─────────────────── public-net ────────────────────┐
│                                                  │
│   bootstrap:4001      relay:4002                │
│   (DHT entry)        (NAT traversal)             │
│                                                  │
└─────────────────────┬────────────────────────────┘
                      │
      ┌───────────────┼───────────────┐
      │               │               │
 nat-net-1       nat-net-2       nat-net-3
      │               │               │
   alice          bob           charlie
 (sender)      (receiver)    (receiver)

[elenaf9]

You don't need a kademlia DHT. You could use, e.g., request-response message to send group messages manually to each member, or in case of large groups a publish-subscribe protocol like gossipsub.
To find groups, you could use rendezvous.

[Lebei2046]

Thanks. AI helped me implement it in a docker. Amazing!!!