led-bot/lights/request.js

import * as net from 'net';

const hostname = '192.168.1.219';
const port = 29999;

function getBinarySize(string) {
  return Buffer.byteLength(string, 'utf8');
}

export default function req(data, callback, errorCallback) {
  let string_data = JSON.stringify(data);
  let size = getBinarySize(string_data);
  if (size > 9999) {
    errorCallback("too long");
    return;
  }

  let client = new net.Socket();

  let c_port = global.ctx.lights.port || port;
  let c_addr = global.ctx.lights.addr || hostname;
  client.connect(c_port, c_addr, () => {
    client.write(string_data);
    client.destroy();
    callback('success.');
  });

  client.on('error', (e) => {
    client.destroy();
    errorCallback(e);
  });
}