const net = require('net');
const boundary = require('boundary-stream');

const conn = net.connect(9090);

conn.on('connect', () => {
    const writer = boundary.writer();

    writer.pipe(conn);

    writer.write(Buffer.alloc(10 * 1024 * 1024)); // Send 10 MiB buffer
    writer.end();
});

// ...

const net = require('net');
const boundary = require('boundary-stream');

const server = net.createServer(function(conn){
    let reader = boundary.reader();

    reader.on('data', (message) => {
        console.log(message.length); // -> 10485760
    });

    conn.pipe(reader);
});

// ...