sudden disconnection after succesful connection to Mosquitto broker using Paho MQTT Js

Question

I've managed to connect to my Mosquitto broker using a 1.1.0 version of Paho MQTT JS client. However, the client disconnects inmediately after completing the connection. Before using this version, I was using 1.0.1 and it worked. This is my code for the main functions involved:

function onConnectionLost(){
        console.log("connection lost");
        document.getElementById("status").innerHTML = "Connection Lost";
        connected_flag=0;
    }

    function onFailure(message) {
        console.log("Failed");
        setTimeout(MQTTconnect, reconnectTimeout);
    }
function onConnect() {
        connected_flag=1;
        document.getElementById("status").innerHTML = "Connected";
        console.log("on Connect "+connected_flag);
        sub_topics();

    }

    function MQTTconnect(id) {
        var user = document.getElementById("user").value;
        var pass = document.getElementById("pass").value;
        //mqtt = new Paho.MQTT.Client(host,port,id);
        mqtt = new Paho.Client("wss://192.168.1.42:9873/mqtt",id);
        //document.write("connecting to "+ host);
        var options = {
            timeout: 3,
            useSSL: true,
            userName: user,
            password: pass,
            onSuccess: onConnect,
            onFailure: onFailure,

        };

        mqtt.onConnectionLost = onConnectionLost;
        mqtt.onMessageArrived = onMessageArrived;
        mqtt.onConnected = onConnected;

        mqtt.connect(options);
        return false;


    }

    function sub_topics(){

        mqtt.subscribe("es2a2/rad");
        mqtt.subscribe("e12r/temp");
        mqtt.subscribe("e92/hum");


        return false;
    }

The log on the Mosquitto broker:

1588334688: New client connected from 192.168.1.43 as 33c1olvtc78311srsavrgq53ce (p2, c1, k60, u'admin').
1588334689: Socket error on client mgqilf3dv8dktthb7u4mudlm5i, disconnecting.

EDIT 1

Mosquitto.conf (using Mosquitto version 1.6.8):

pid_file /var/run/mosquitto.pid

persistence true
persistence_location /var/lib/mosquitto/

log_dest file /var/log/mosquitto/mosquitto.log

include_dir /etc/mosquitto/conf.d

per_listener_settings true

listener 9873
protocol websockets
cafile /etc/mosquitto/ca_certificates/ca.crt
keyfile /etc/mosquitto/certs/server.key
certfile /etc/mosquitto/certs/server.crt
allow_anonymous false
password_file /etc/mosquitto/passwdfile

listener 8883
cafile /etc/mosquitto/ca_certificates/ca.crt
keyfile /etc/mosquitto/certs/server.key
certfile /etc/mosquitto/certs/server.crt

Edit to include your mosquitto.conf so we can see how it's setup for the websocket listener. Also include the mosquitto version information — hardillb

JD Allen JD Allen · Accepted Answer · 2020-05-02T00:05:20

Socket errors right after a "Connect" message are almost always an Auth issue -- your password is wrong, you userID is wrong, you SSL cert is not known to Mosquitto, etc. Double check all that and see if you find something.

sudden disconnection after succesful connection to Mosquitto broker using Paho MQTT Js

1 Answers