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mqtt-backend/node_modules/aedes-packet/packet.js

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+'use strict'
+
+function Packet (original, broker) {
+  if (Object.prototype.hasOwnProperty.call(original, 'clientId')) this.clientId = original.clientId
+  if (Object.prototype.hasOwnProperty.call(original, 'nl')) this.nl = original.nl
+
+  this.cmd = original.cmd || 'publish'
+  this.brokerId = original.brokerId || (broker && broker.id)
+  this.brokerCounter = original.brokerCounter || (broker ? (++broker.counter) : 0)
+  this.topic = original.topic
+  this.payload = original.payload || Buffer.alloc(0)
+  this.qos = original.qos || 0
+  this.retain = original.retain || false
+  this.dup = original.dup || false
+  // [MQTT-2.3.1-5]
+  if (this.qos > 0 || this.cmd !== 'publish') {
+    //  [MQTT-2.3.1-1]
+    // This is packet identifier uniquely identifies a message as it flows between
+    // client and broker. It is only relevant for QoS levels greater than 0
+    this.messageId = undefined
+  }
+}
+
+module.exports = Packet