ObbyClient class

One connection.

Call close when finished. The engine holds native memory that Dart's collector knows nothing about, so nothing releases it on your behalf.

One client belongs to one isolate. The native handle is not synchronised, so sending its address to another isolate and rebuilding it there is undefined behaviour, not merely a race. Give each isolate its own client.

final client = ObbyClient(nick: 'me');
final socket = await Socket.connect('irc.libera.chat', 6667);
client.handleConnected();

socket.listen((chunk) {
  client.handleBytes(chunk);
  client.tick(stopwatch.elapsedMilliseconds, DateTime.now().millisecondsSinceEpoch);

  for (final event in client.pollEvents()) {
    if (event['type'] == 'registered') {
      client.join('#obby');
      client.sendMessage('#obby', 'hello');
    }
  }
  for (var out = client.pollTransmit(); out != null; out = client.pollTransmit()) {
    socket.add(out);
  }
});