Mqtt client doesn't receive QOS 0 or QOS 1 messages sporadically.

System Information

• Aedes: 0.42.5
• NodeJS: 12.16.1
• OS: Ubuntu 18.04
• Arch: x86_64

Describe the bug Mqtt client doesn’t receive QOS 0 or QOS 1 messages sporadically. I can reproduce using the following code

var mqtt = require('mqtt');
// let mqtClient = mqtt.connect('mqtt://broker.emqx.io');  this mqtt broker works perfectly
let mqtClient = mqtt.connect('mqtt://backend.com', {
    username: 'user-432423',
    password: 'c307a13d-ccf3-324-bc17-7182162e5682'
});  
setInterval(()=> {
    let randomNumber = Math.round(Math.random() * 100000) + '';
    mqtClient.publish('/5f3f3fafe4d74c00161dda2c/1', randomNumber, { qos: 1})
    mqtClient.publish('/5f3f3fafe4d74c00161dda2c/2', randomNumber, { qos: 1})
    mqtClient.publish('/5f3f3fafe4d74c00161dda2c/3', randomNumber, { qos: 1})
    mqtClient.publish('/5f3f3fafe4d74c00161dda2c/4', randomNumber, { qos: 1})    
}, 2 * 1000);

broker.emqx.io broker always sends messages but aedes sometimes miss the delivery to the client I am using mqttfx as client, mongo-persistenance and mongo-emitter Sometimes the client only receives 3 out of 4 messages. 1 goes missing every minute or so.

[mogupta]

@robertsLando was on vacation. Will try it out soon.

[robertsLando]

@mogupta With mqemitter-mongodb@7.0.4 everything should work perfectly!