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mqtt-backend/node_modules/aedes/benchmarks/pingpong.js

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+#! /usr/bin/env node
+
+const mqtt = require('mqtt')
+const convertHrtime = require('convert-hrtime')
+const mode = require('compute-mode')
+const client = mqtt.connect({ port: 1883, host: 'localhost', clean: true, keepalive: 0 })
+const interval = 5000
+
+let sent = 0
+const latencies = []
+
+function count () {
+  console.log('sent/s', sent / interval * 1000)
+  sent = 0
+}
+
+setInterval(count, interval)
+
+function publish () {
+  sent++
+  client.publish('test', JSON.stringify(process.hrtime()), { qos: 1 })
+}
+
+function subscribe () {
+  client.subscribe('test', { qos: 1 }, publish)
+}
+
+client.on('connect', subscribe)
+client.on('message', publish)
+client.on('message', function (topic, payload) {
+  const sentAt = JSON.parse(payload)
+  const diff = process.hrtime(sentAt)
+  latencies.push(convertHrtime(diff).ms)
+})
+
+client.on('offline', function () {
+  console.log('offline')
+})
+
+client.on('error', function () {
+  console.log('reconnect!')
+  client.stream.end()
+})
+
+process.on('SIGINT', function () {
+  const total = latencies.reduce(function (acc, num) {
+    return acc + num
+  })
+  console.log('total', total)
+  console.log('average', total / latencies.length)
+  console.log('mode', mode(latencies))
+  process.exit(0)
+})