flutter_chat_websockets.dart

import 'package:web_socket_channel/web_socket_channel.dart';

class SomeClass {
  // Contains message history
  final _messages = <String>[];
  late final WebSocketChannel _channel;

  void createConnection() {
    // Connect to web socket
    _channel = WebSocketChannel.connect(Uri.parse('ws://localhost:8080/ws'));

    // Listen for incoming messages
    _channel.stream.listen(
      (message) => _messages.add(message),
    );

    // Send messages to the server
    _channel.sink.add('Hello fellows!');
  }
}