@asyncapi/generator/lib/templates/bakedInTemplates/core-template-client-websocket-dart/components/SendEchoMessage.js

The AsyncAPI generator. It can generate documentation, code, anything!

import { Text } from '@asyncapi/generator-react-sdk';

export function SendEchoMessage() {
  return (
    <Text newLines={2} indent={2}>
      {
        `/// Method to send an echo message to the server
void sendEchoMessage(dynamic message) {
  if (_channel == null) {
    print('Error: WebSocket is not connected.');
    return;
  }
  final payload = message is String ? message : jsonEncode(message);
  _channel!.sink.add(payload);
  print('Sent message to echo server: $payload');
}`
      }
    </Text>
  );
}