Small nodejs script to test out qemu control communication with RebbleOS

qemu_control_test.js

const net = require("net");
const repl = require("repl");
const sock = net.connect(63771);
sock.on('close', () => process.exit(0));

function flat(arr)
{
    if (!Array.isArray(arr))
        return [ arr ];
    return arr
        .map(n => flat(n))
        .reduce((p, c) => { p.push.apply(p, c); return p }, []);
}

global.send = function send(data) {
    data = flat(data);
    const buf = Buffer.from(data);
    console.log("Send:", buf);
    sock.write(buf);
}

global.ui16 = function ui16(num) {
    const buf = Buffer.alloc(2);
    buf.writeUInt16BE(num, 0);
    return [...buf];
}

global.cstr = function cstr(str) {
    return [...Buffer.from(str + "\0", "utf8")];
}

global.packet = function packet(protocol, data) {
    return [
        ui16(0xFEED),
        ui16(protocol),
        ui16(data.length),
        data,
        ui16(0xBEEF)
    ];
}

global.sendpacket = function sendpacket(protocol, data) {
    send(packet(protocol, data));
}

repl.start({
    prompt: '> ',
    input: process.stdin,
    output: process.stdout,
    useGlobal: true
});