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v86
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<!doctype html>
<title>TCP Terminal</title>

<script src="../build/libv86.js"></script>
<script>
"use strict";

window.onload = function()
{
    var emulator = window.emulator = new V86({
        wasm_path: "../build/v86.wasm",
        memory_size: 64 * 1024 * 1024,
        vga_memory_size: 2 * 1024 * 1024,
        screen_container: document.getElementById("screen_container"),
        bios: {
            url: "../bios/seabios.bin",
        },
        vga_bios: {
            url: "../bios/vgabios.bin",
        },
        bzimage: {
            url: "../images/buildroot-bzimage68.bin",
        },
        net_device: {
            relay_url: "fetch",
            type: "virtio"
        },
        autostart: true
    });

    var is_connected = false, connection = null;

    function clear_log()
    {
        document.getElementById("log").value = "";
    }

    function write_log(text)
    {
        document.getElementById("log").value += text;
    }

    function on_connect()
    {
        document.getElementById("connect").innerHTML = "Disconnect";
        document.getElementById("send").disabled = false;
        is_connected = true; 
    }

    function on_disconnect()
    {
        document.getElementById("connect").innerHTML = "Connect";
        document.getElementById("send").disabled = true;
        is_connected = false;
    }

    document.getElementById("connect").onclick = async function() {
        if(!is_connected) 
        {
            clear_log();
            let port = parseInt(document.getElementById("port").value);
            write_log("> Probing port " + port + "\n");

            let open = await emulator.network_adapter.tcp_probe(port);
            if(open)
            {
                connection = emulator.network_adapter.connect(port);

                connection.on("connect", function()
                {
                    write_log("> Connected\n\n");
                    on_connect();
                });

                connection.on("data", function(data)
                {
                    write_log(new TextDecoder().decode(data));
                });

                connection.on("close", function()
                {
                    write_log("\n> Closed by listener");
                    on_disconnect();
                });

                connection.on("shutdown", function()
                {
                    write_log("\n> Shutdown by listener");
                    on_disconnect();
                });
            }
            else
            {
                write_log("> Probing failed");
            }
        }
        else
        {
            connection.close();
            write_log("\n> Closed by client");
            on_disconnect();
        }
    }

    document.getElementById("send").onclick = function() 
    {
        connection.write(new TextEncoder().encode(document.getElementById("prompt").value + "\r\n"));
        document.getElementById("prompt").value = "";
    }

    document.getElementById("prompt").onkeydown = function(e)
    {
        if(e.which == 13 && is_connected)
        {
            document.getElementById("send").onclick();
        }
    };

    clear_log();
}
</script>

<div id="screen_container" style="float: left">
    <div style="white-space: pre; font: 14px monospace; line-height: 14px"></div>
    <canvas style="display: none"></canvas>
</div>

<div style="float: left; margin: 10px">
    <textarea readonly cols="60" rows="15" id="log"></textarea><br>
    Port: <input type="number" min="1" max="65535" value="1234" id="port" />
    <button id="connect">Connect</button> <input type="text" id="prompt" />
    <button id="send" disabled="true">Send (enter)</button>

    <h3>Getting started</h3>
    <ol>
        <li>Run <code>udhcpc</code></li>
        <li>Run any TCP server:
        <ul>
        <li>Echo: <code>socat -v PIPE TCP-L:1234,fork</code></li> 
        <li>(more examples on <a href="broadcast-network.html">broadcast-network.html</a>)</li>
        </ul>
        <li>Type a port number and press "Connect"</li>
    </ol>
</div>