rocket.chat.mqtt/node_modules/mqtt-packet/packet.js

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

function Packet () {
  this.cmd = null
  this.retain = false
  this.qos = 0
  this.dup = false
  this.length = -1
  this.topic = null
  this.payload = null
}

module.exports = Packet