Function cleanup

example/platform/index.js:43–47

()

  const server = new WebThingServer(new SingleThing(thing), port);
  process.on('SIGINT', () => {
    const cleanup = () => {
      thing && thing.close();
      log(`log: board: ${board}: Exit`);
      process.exit();
    };
    server.stop().then(cleanup).catch(cleanup);
  });
  server.start().catch(console.error);