rocket.chat.mqtt/node_modules/aedes/lib/write.js

It's a MQTT Server, using redis to scale horizontally.

'use strict'

var mqtt = require('mqtt-packet')

function write (client, packet, done) {
  var result = mqtt.writeToStream(packet, client.conn)

  if (!result && !client.errored && done) {
    client.conn.once('drain', done)
  } else if (done) {
    setImmediate(done)
  }
}

module.exports = write