Two clients interfere with each other since they have the same client ID

.gitingore

node_modules

index.js

var mqtt = require('mqtt');

var client1 = mqtt.createClient()
  , client2 = mqtt.createClient();

client1.on('close', function () {
  console.log('client1 closing');
});
client2.on('close', function () {
  console.log('client2 closing');
});

why

Mar  8 09:08:35 christopher mosquitto[679]: New connection from 127.0.0.1.
Mar  8 09:08:35 christopher mosquitto[679]: New client connected from 127.0.0.1 as mqttjs_d6bd6054a4c869f1.
Mar  8 09:08:35 christopher mosquitto[679]: Client mqttjs_d6bd6054a4c869f1 already connected, closing old connection.
Mar  8 09:08:35 christopher mosquitto[679]: New client connected from 127.0.0.1 as mqttjs_d6bd6054a4c869f1.
Mar  8 09:08:45 christopher mosquitto[679]: Socket read error on client mqttjs_d6bd6054a4c869f1, disconnecting.