In a random terminal run the seed node:

    cargo run --bin ircd -- --accept 127.0.0.1:9999 --log /tmp/seed.log --irc 127.0.0.1:6699

In two other terminals run first the server:

    cargo run --bin ircd -- --accept 127.0.0.1:10005 --seeds 127.0.0.1:9999 --log /tmp/server.log --irc 127.0.0.1:6688

And a client node:

    cargo run --bin ircd -- --slots 1 --seeds 127.0.0.1:9999 --log /tmp/client.log --irc 127.0.0.1:6667

Then you now need to open two weechat instances.

First just run weechat and make sure temporary connections option is set:

    /set irc.look.temporary_servers on

To run a second weechat instance, use the --dir option

    weechat --dir /tmp/

And also set temporary servers for this instance as well:

    /set irc.look.temporary_servers on

Now connect to both nodes (in each weechat instance) using:

    /connect localhost

    /connect localhost/6688

Now you can message between them both.