run-this-on-tessel.js

"use strict";
const net = require("net");
const monitor = {
  connection: null,
  queue: [],
  write() {
    if (monitor.connection === null) {
      monitor.queue.push(arguments);
    } else {
      monitor.connection.write.apply(monitor.connection, arguments);
    }
  }
};
const server = net.createServer((c) => {
  monitor.connection = c;
  c.on("end", () => {
    monitor.connection = null;
  });

  if (monitor.queue.length) {
    let message;
    while (message = monitor.queue.shift()) {
      monitor.connection.write.apply(monitor.connection, message);
    }
  }
  c.pipe(c);
});
server.listen(8124);

// Write will queue all messages and send them
// once a remote client connection is made.
// Once connected, new messages will be sent directly
monitor.write("Hi!");

run-this-on-your-developer-machine.js

const net = require("net");
const client = net.createConnection({ host: "your-tessel-name.local", port: 8124 }, () => {
  console.log("Connected to Tessel...");
});
client.on("data", (data) => {
  console.log(data.toString());
});